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@@ -0,0 +1,1395 @@
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+/** @preserve
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+jSignature v2 "${buildDate}" "${commitID}"
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+Copyright (c) 2012 Willow Systems Corp http://willow-systems.com
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+Copyright (c) 2010 Brinley Ang http://www.unbolt.net
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+MIT License <http://www.opensource.org/licenses/mit-license.php>
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+
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+*/
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+;(function() {
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+
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+var apinamespace = 'jSignature'
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+
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+/**
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+Allows one to delay certain eventual action by setting up a timer for it and allowing one to delay it
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+by "kick"ing it. Sorta like "kick the can down the road"
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+
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+@public
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+@class
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+@param
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+@returns {Type}
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+*/
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+var KickTimerClass = function(time, callback) {
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+ var timer
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+ this.kick = function() {
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+ clearTimeout(timer)
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+ timer = setTimeout(
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+ callback
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+ , time
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+ )
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+ }
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+ this.clear = function() {
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+ clearTimeout(timer)
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+ }
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+ return this
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+}
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+
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+var PubSubClass = function(context){
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+ 'use strict'
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+ /* @preserve
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+ -----------------------------------------------------------------------------------------------
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+ JavaScript PubSub library
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+ 2012 (c) Willow Systems Corp (www.willow-systems.com)
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+ based on Peter Higgins (dante@dojotoolkit.org)
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+ Loosely based on Dojo publish/subscribe API, limited in scope. Rewritten blindly.
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+ Original is (c) Dojo Foundation 2004-2010. Released under either AFL or new BSD, see:
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+ http://dojofoundation.org/license for more information.
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+ -----------------------------------------------------------------------------------------------
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+ */
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+ this.topics = {}
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+ // here we choose what will be "this" for the called events.
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+ // if context is defined, it's context. Else, 'this' is this instance of PubSub
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+ this.context = context ? context : this
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+ /**
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+ * Allows caller to emit an event and pass arguments to event listeners.
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+ * @public
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+ * @function
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+ * @param topic {String} Name of the channel on which to voice this event
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+ * @param **arguments Any number of arguments you want to pass to the listeners of this event.
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+ */
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+ this.publish = function(topic, arg1, arg2, etc) {
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+ 'use strict'
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+ if (this.topics[topic]) {
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+ var currentTopic = this.topics[topic]
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+ , args = Array.prototype.slice.call(arguments, 1)
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+ , toremove = []
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+ , fn
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+ , i, l
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+ , pair
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+
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+ for (i = 0, l = currentTopic.length; i < l; i++) {
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+ pair = currentTopic[i] // this is a [function, once_flag] array
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+ fn = pair[0]
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+ if (pair[1] /* 'run once' flag set */){
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+ pair[0] = function(){}
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+ toremove.push(i)
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+ }
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+ fn.apply(this.context, args)
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+ }
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+ for (i = 0, l = toremove.length; i < l; i++) {
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+ currentTopic.splice(toremove[i], 1)
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+ }
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+ }
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+ }
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+ /**
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+ * Allows listener code to subscribe to channel and be called when data is available
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+ * @public
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+ * @function
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+ * @param topic {String} Name of the channel on which to voice this event
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+ * @param callback {Function} Executable (function pointer) that will be ran when event is voiced on this channel.
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+ * @param once {Boolean} (optional. False by default) Flag indicating if the function is to be triggered only once.
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+ * @returns {Object} A token object that cen be used for unsubscribing.
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+ */
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+ this.subscribe = function(topic, callback, once) {
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+ 'use strict'
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+ if (!this.topics[topic]) {
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+ this.topics[topic] = [[callback, once]];
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+ } else {
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+ this.topics[topic].push([callback,once]);
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+ }
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+ return {
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+ "topic": topic,
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+ "callback": callback
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+ };
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+ };
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+ /**
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+ * Allows listener code to unsubscribe from a channel
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+ * @public
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+ * @function
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+ * @param token {Object} A token object that was returned by `subscribe` method
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+ */
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+ this.unsubscribe = function(token) {
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+ if (this.topics[token.topic]) {
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+ var currentTopic = this.topics[token.topic]
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+
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+ for (var i = 0, l = currentTopic.length; i < l; i++) {
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+ if (currentTopic[i][0] === token.callback) {
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+ currentTopic.splice(i, 1)
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+ }
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+ }
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+ }
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+ }
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+}
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+
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+/// Returns front, back and "decor" colors derived from element (as jQuery obj)
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+function getColors($e){
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+ var tmp
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+ , undef
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+ , frontcolor = $e.css('color')
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+ , backcolor
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+ , e = $e[0]
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+
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+ var toOfDOM = false
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+ while(e && !backcolor && !toOfDOM){
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+ try{
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+ tmp = $(e).css('background-color')
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+ } catch (ex) {
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+ tmp = 'transparent'
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+ }
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+ if (tmp !== 'transparent' && tmp !== 'rgba(0, 0, 0, 0)'){
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+ backcolor = tmp
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+ }
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+ toOfDOM = e.body
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+ e = e.parentNode
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+ }
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+
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+ var rgbaregex = /rgb[a]*\((\d+),\s*(\d+),\s*(\d+)/ // modern browsers
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+ , hexregex = /#([AaBbCcDdEeFf\d]{2})([AaBbCcDdEeFf\d]{2})([AaBbCcDdEeFf\d]{2})/ // IE 8 and less.
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+ , frontcolorcomponents
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+
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+ // Decomposing Front color into R, G, B ints
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+ tmp = undef
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+ tmp = frontcolor.match(rgbaregex)
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+ if (tmp){
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+ frontcolorcomponents = {'r':parseInt(tmp[1],10),'g':parseInt(tmp[2],10),'b':parseInt(tmp[3],10)}
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+ } else {
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+ tmp = frontcolor.match(hexregex)
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+ if (tmp) {
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+ frontcolorcomponents = {'r':parseInt(tmp[1],16),'g':parseInt(tmp[2],16),'b':parseInt(tmp[3],16)}
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+ }
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+ }
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+// if(!frontcolorcomponents){
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+// frontcolorcomponents = {'r':255,'g':255,'b':255}
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+// }
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+
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+ var backcolorcomponents
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+ // Decomposing back color into R, G, B ints
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+ if(!backcolor){
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+ // HIghly unlikely since this means that no background styling was applied to any element from here to top of dom.
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+ // we'll pick up back color from front color
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+ if(frontcolorcomponents){
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+ if (Math.max.apply(null, [frontcolorcomponents.r, frontcolorcomponents.g, frontcolorcomponents.b]) > 127){
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+ backcolorcomponents = {'r':0,'g':0,'b':0}
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+ } else {
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+ backcolorcomponents = {'r':255,'g':255,'b':255}
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+ }
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+ } else {
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+ // arg!!! front color is in format we don't understand (hsl, named colors)
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+ // Let's just go with white background.
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+ backcolorcomponents = {'r':255,'g':255,'b':255}
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+ }
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+ } else {
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+ tmp = undef
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+ tmp = backcolor.match(rgbaregex)
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+ if (tmp){
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+ backcolorcomponents = {'r':parseInt(tmp[1],10),'g':parseInt(tmp[2],10),'b':parseInt(tmp[3],10)}
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+ } else {
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+ tmp = backcolor.match(hexregex)
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+ if (tmp) {
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+ backcolorcomponents = {'r':parseInt(tmp[1],16),'g':parseInt(tmp[2],16),'b':parseInt(tmp[3],16)}
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+ }
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+ }
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+// if(!backcolorcomponents){
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+// backcolorcomponents = {'r':0,'g':0,'b':0}
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+// }
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+ }
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+
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+ // Deriving Decor color
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+ // THis is LAZY!!!! Better way would be to use HSL and adjust luminocity. However, that could be an overkill.
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+
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+ var toRGBfn = function(o){return 'rgb(' + [o.r, o.g, o.b].join(', ') + ')'}
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+ , decorcolorcomponents
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+ , frontcolorbrightness
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+ , adjusted
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+
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+ if (frontcolorcomponents && backcolorcomponents){
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+ var backcolorbrightness = Math.max.apply(null, [frontcolorcomponents.r, frontcolorcomponents.g, frontcolorcomponents.b])
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+
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+ frontcolorbrightness = Math.max.apply(null, [backcolorcomponents.r, backcolorcomponents.g, backcolorcomponents.b])
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+ adjusted = Math.round(frontcolorbrightness + (-1 * (frontcolorbrightness - backcolorbrightness) * 0.75)) // "dimming" the difference between pen and back.
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+ decorcolorcomponents = {'r':adjusted,'g':adjusted,'b':adjusted} // always shade of gray
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+ } else if (frontcolorcomponents) {
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+ frontcolorbrightness = Math.max.apply(null, [frontcolorcomponents.r, frontcolorcomponents.g, frontcolorcomponents.b])
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+ var polarity = +1
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+ if (frontcolorbrightness > 127){
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+ polarity = -1
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+ }
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+ // shifting by 25% (64 points on RGB scale)
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+ adjusted = Math.round(frontcolorbrightness + (polarity * 96)) // "dimming" the pen's color by 75% to get decor color.
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+ decorcolorcomponents = {'r':adjusted,'g':adjusted,'b':adjusted} // always shade of gray
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+ } else {
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+ decorcolorcomponents = {'r':191,'g':191,'b':191} // always shade of gray
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+ }
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+
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+ return {
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+ 'color': frontcolor
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+ , 'background-color': backcolorcomponents? toRGBfn(backcolorcomponents) : backcolor
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+ , 'decor-color': toRGBfn(decorcolorcomponents)
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+ }
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+}
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+
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+function Vector(x,y){
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+ this.x = x
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+ this.y = y
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+ this.reverse = function(){
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+ return new this.constructor(
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+ this.x * -1
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+ , this.y * -1
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+ )
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+ }
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+ this._length = null
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+ this.getLength = function(){
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+ if (!this._length){
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+ this._length = Math.sqrt( Math.pow(this.x, 2) + Math.pow(this.y, 2) )
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+ }
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+ return this._length
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+ }
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+
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+ var polarity = function (e){
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+ return Math.round(e / Math.abs(e))
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+ }
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+ this.resizeTo = function(length){
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+ // proportionally changes x,y such that the hypotenuse (vector length) is = new length
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+ if (this.x === 0 && this.y === 0){
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+ this._length = 0
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+ } else if (this.x === 0){
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+ this._length = length
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+ this.y = length * polarity(this.y)
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+ } else if(this.y === 0){
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+ this._length = length
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+ this.x = length * polarity(this.x)
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+ } else {
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+ var proportion = Math.abs(this.y / this.x)
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+ , x = Math.sqrt(Math.pow(length, 2) / (1 + Math.pow(proportion, 2)))
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+ , y = proportion * x
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+ this._length = length
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+ this.x = x * polarity(this.x)
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+ this.y = y * polarity(this.y)
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+ }
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+ return this
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+ }
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+
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+ /**
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+ * Calculates the angle between 'this' vector and another.
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+ * @public
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+ * @function
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+ * @returns {Number} The angle between the two vectors as measured in PI.
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+ */
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+ this.angleTo = function(vectorB) {
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+ var divisor = this.getLength() * vectorB.getLength()
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+ if (divisor === 0) {
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+ return 0
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+ } else {
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+ // JavaScript floating point math is screwed up.
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+ // because of it, the core of the formula can, on occasion, have values
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+ // over 1.0 and below -1.0.
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+ return Math.acos(
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+ Math.min(
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+ Math.max(
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+ ( this.x * vectorB.x + this.y * vectorB.y ) / divisor
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+ , -1.0
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+ )
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+ , 1.0
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+ )
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+ ) / Math.PI
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+ }
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+ }
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+}
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+
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+function Point(x,y){
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+ this.x = x
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+ this.y = y
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+
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+ this.getVectorToCoordinates = function (x, y) {
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+ return new Vector(x - this.x, y - this.y)
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+ }
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+ this.getVectorFromCoordinates = function (x, y) {
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+ return this.getVectorToCoordinates(x, y).reverse()
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+ }
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+ this.getVectorToPoint = function (point) {
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+ return new Vector(point.x - this.x, point.y - this.y)
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+ }
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+ this.getVectorFromPoint = function (point) {
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+ return this.getVectorToPoint(point).reverse()
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+ }
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+}
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+
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+/*
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+ * About data structure:
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+ * We don't store / deal with "pictures" this signature capture code captures "vectors"
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+ *
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+ * We don't store bitmaps. We store "strokes" as arrays of arrays. (Actually, arrays of objects containing arrays of coordinates.
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+ *
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+ * Stroke = mousedown + mousemoved * n (+ mouseup but we don't record that as that was the "end / lack of movement" indicator)
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+ *
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+ * Vectors = not classical vectors where numbers indicated shift relative last position. Our vectors are actually coordinates against top left of canvas.
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+ * we could calc the classical vectors, but keeping the the actual coordinates allows us (through Math.max / min)
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+ * to calc the size of resulting drawing very quickly. If we want classical vectors later, we can always get them in backend code.
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+ *
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+ * So, the data structure:
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+ *
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+ * var data = [
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+ * { // stroke starts
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+ * x : [101, 98, 57, 43] // x points
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+ * , y : [1, 23, 65, 87] // y points
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+ * } // stroke ends
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+ * , { // stroke starts
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+ * x : [55, 56, 57, 58] // x points
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+ * , y : [101, 97, 54, 4] // y points
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+ * } // stroke ends
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+ * , { // stroke consisting of just a dot
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+ * x : [53] // x points
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+ * , y : [151] // y points
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+ * } // stroke ends
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+ * ]
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+ *
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+ * we don't care or store stroke width (it's canvas-size-relative), color, shadow values. These can be added / changed on whim post-capture.
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+ *
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+ */
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+function DataEngine(storageObject, context, startStrokeFn, addToStrokeFn, endStrokeFn){
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+ this.data = storageObject // we expect this to be an instance of Array
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+ this.context = context
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+
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+ if (storageObject.length){
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+ // we have data to render
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+ var numofstrokes = storageObject.length
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+ , stroke
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+ , numofpoints
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+
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+ for (var i = 0; i < numofstrokes; i++){
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+ stroke = storageObject[i]
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+ numofpoints = stroke.x.length
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+ startStrokeFn.call(context, stroke)
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+ for(var j = 1; j < numofpoints; j++){
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+ addToStrokeFn.call(context, stroke, j)
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+ }
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+ endStrokeFn.call(context, stroke)
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+ }
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+ }
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+
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+ this.changed = function(){}
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+
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+ this.startStrokeFn = startStrokeFn
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+ this.addToStrokeFn = addToStrokeFn
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+ this.endStrokeFn = endStrokeFn
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+
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+ this.inStroke = false
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+
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+ this._lastPoint = null
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+ this._stroke = null
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+ this.startStroke = function(point){
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+ if(point && typeof(point.x) == "number" && typeof(point.y) == "number"){
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+ this._stroke = {'x':[point.x], 'y':[point.y]}
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+ this.data.push(this._stroke)
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+ this._lastPoint = point
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+ this.inStroke = true
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+ // 'this' does not work same inside setTimeout(
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+ var stroke = this._stroke
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+ , fn = this.startStrokeFn
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+ , context = this.context
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+ setTimeout(
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+ // some IE's don't support passing args per setTimeout API. Have to create closure every time instead.
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+ function() {fn.call(context, stroke)}
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+ , 3
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+ )
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+ return point
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+ } else {
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+ return null
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+ }
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|
|
+ }
|
|
|
+ // that "5" at the very end of this if is important to explain.
|
|
|
+ // we do NOT render links between two captured points (in the middle of the stroke) if the distance is shorter than that number.
|
|
|
+ // not only do we NOT render it, we also do NOT capture (add) these intermediate points to storage.
|
|
|
+ // when clustering of these is too tight, it produces noise on the line, which, because of smoothing, makes lines too curvy.
|
|
|
+ // maybe, later, we can expose this as a configurable setting of some sort.
|
|
|
+ this.addToStroke = function(point){
|
|
|
+ if (this.inStroke &&
|
|
|
+ typeof(point.x) === "number" &&
|
|
|
+ typeof(point.y) === "number" &&
|
|
|
+ // calculates absolute shift in diagonal pixels away from original point
|
|
|
+ (Math.abs(point.x - this._lastPoint.x) + Math.abs(point.y - this._lastPoint.y)) > 4
|
|
|
+ ){
|
|
|
+ var positionInStroke = this._stroke.x.length
|
|
|
+ this._stroke.x.push(point.x)
|
|
|
+ this._stroke.y.push(point.y)
|
|
|
+ this._lastPoint = point
|
|
|
+
|
|
|
+ var stroke = this._stroke
|
|
|
+ , fn = this.addToStrokeFn
|
|
|
+ , context = this.context
|
|
|
+ setTimeout(
|
|
|
+ // some IE's don't support passing args per setTimeout API. Have to create closure every time instead.
|
|
|
+ function() {fn.call(context, stroke, positionInStroke)}
|
|
|
+ , 3
|
|
|
+ )
|
|
|
+ return point
|
|
|
+ } else {
|
|
|
+ return null
|
|
|
+ }
|
|
|
+ }
|
|
|
+ this.endStroke = function(){
|
|
|
+ var c = this.inStroke
|
|
|
+ this.inStroke = false
|
|
|
+ this._lastPoint = null
|
|
|
+ if (c){
|
|
|
+ var stroke = this._stroke
|
|
|
+ , fn = this.endStrokeFn // 'this' does not work same inside setTimeout(
|
|
|
+ , context = this.context
|
|
|
+ , changedfn = this.changed
|
|
|
+ setTimeout(
|
|
|
+ // some IE's don't support passing args per setTimeout API. Have to create closure every time instead.
|
|
|
+ function(){
|
|
|
+ fn.call(context, stroke)
|
|
|
+ changedfn.call(context)
|
|
|
+ }
|
|
|
+ , 3
|
|
|
+ )
|
|
|
+ return true
|
|
|
+ } else {
|
|
|
+ return null
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+var basicDot = function(ctx, x, y, size){
|
|
|
+ var fillStyle = ctx.fillStyle
|
|
|
+ ctx.fillStyle = ctx.strokeStyle
|
|
|
+ ctx.fillRect(x + size / -2 , y + size / -2, size, size)
|
|
|
+ ctx.fillStyle = fillStyle
|
|
|
+}
|
|
|
+, basicLine = function(ctx, startx, starty, endx, endy){
|
|
|
+ ctx.beginPath()
|
|
|
+ ctx.moveTo(startx, starty)
|
|
|
+ ctx.lineTo(endx, endy)
|
|
|
+ ctx.closePath();
|
|
|
+ ctx.stroke()
|
|
|
+}
|
|
|
+, basicCurve = function(ctx, startx, starty, endx, endy, cp1x, cp1y, cp2x, cp2y){
|
|
|
+ ctx.beginPath()
|
|
|
+ ctx.moveTo(startx, starty)
|
|
|
+ ctx.bezierCurveTo(cp1x, cp1y, cp2x, cp2y, endx, endy)
|
|
|
+ ctx.closePath();
|
|
|
+ ctx.stroke()
|
|
|
+}
|
|
|
+, strokeStartCallback = function(stroke) {
|
|
|
+ // this = jSignatureClass instance
|
|
|
+ basicDot(this.canvasContext, stroke.x[0], stroke.y[0], this.settings.lineWidth)
|
|
|
+}
|
|
|
+, strokeAddCallback = function(stroke, positionInStroke){
|
|
|
+ // this = jSignatureClass instance
|
|
|
+
|
|
|
+ // Because we are funky this way, here we draw TWO curves.
|
|
|
+ // 1. POSSIBLY "this line" - spanning from point right before us, to this latest point.
|
|
|
+ // 2. POSSIBLY "prior curve" - spanning from "latest point" to the one before it.
|
|
|
+
|
|
|
+ // Why you ask?
|
|
|
+ // long lines (ones with many pixels between them) do not look good when they are part of a large curvy stroke.
|
|
|
+ // You know, the jaggedy crocodile spine instead of a pretty, smooth curve. Yuck!
|
|
|
+ // We want to approximate pretty curves in-place of those ugly lines.
|
|
|
+ // To approximate a very nice curve we need to know the direction of line before and after.
|
|
|
+ // Hence, on long lines we actually wait for another point beyond it to come back from
|
|
|
+ // mousemoved before we draw this curve.
|
|
|
+
|
|
|
+ // So for "prior curve" to be calc'ed we need 4 points
|
|
|
+ // A, B, C, D (we are on D now, A is 3 points in the past.)
|
|
|
+ // and 3 lines:
|
|
|
+ // pre-line (from points A to B),
|
|
|
+ // this line (from points B to C), (we call it "this" because if it was not yet, it's the only one we can draw for sure.)
|
|
|
+ // post-line (from points C to D) (even through D point is 'current' we don't know how we can draw it yet)
|
|
|
+ //
|
|
|
+ // Well, actually, we don't need to *know* the point A, just the vector A->B
|
|
|
+ var Cpoint = new Point(stroke.x[positionInStroke-1], stroke.y[positionInStroke-1])
|
|
|
+ , Dpoint = new Point(stroke.x[positionInStroke], stroke.y[positionInStroke])
|
|
|
+ , CDvector = Cpoint.getVectorToPoint(Dpoint)
|
|
|
+
|
|
|
+ // Again, we have a chance here to draw TWO things:
|
|
|
+ // BC Curve (only if it's long, because if it was short, it was drawn by previous callback) and
|
|
|
+ // CD Line (only if it's short)
|
|
|
+
|
|
|
+ // So, let's start with BC curve.
|
|
|
+ // if there is only 2 points in stroke array, we don't have "history" long enough to have point B, let alone point A.
|
|
|
+ // Falling through to drawing line CD is proper, as that's the only line we have points for.
|
|
|
+ if(positionInStroke > 1) {
|
|
|
+ // we are here when there are at least 3 points in stroke array.
|
|
|
+ var Bpoint = new Point(stroke.x[positionInStroke-2], stroke.y[positionInStroke-2])
|
|
|
+ , BCvector = Bpoint.getVectorToPoint(Cpoint)
|
|
|
+ , ABvector
|
|
|
+ if(BCvector.getLength() > this.lineCurveThreshold){
|
|
|
+ // Yey! Pretty curves, here we come!
|
|
|
+ if(positionInStroke > 2) {
|
|
|
+ // we are here when at least 4 points in stroke array.
|
|
|
+ ABvector = (new Point(stroke.x[positionInStroke-3], stroke.y[positionInStroke-3])).getVectorToPoint(Bpoint)
|
|
|
+ } else {
|
|
|
+ ABvector = new Vector(0,0)
|
|
|
+ }
|
|
|
+
|
|
|
+ var minlenfraction = 0.05
|
|
|
+ , maxlen = BCvector.getLength() * 0.35
|
|
|
+ , ABCangle = BCvector.angleTo(ABvector.reverse())
|
|
|
+ , BCDangle = CDvector.angleTo(BCvector.reverse())
|
|
|
+ , BCP1vector = new Vector(ABvector.x + BCvector.x, ABvector.y + BCvector.y).resizeTo(
|
|
|
+ Math.max(minlenfraction, ABCangle) * maxlen
|
|
|
+ )
|
|
|
+ , CCP2vector = (new Vector(BCvector.x + CDvector.x, BCvector.y + CDvector.y)).reverse().resizeTo(
|
|
|
+ Math.max(minlenfraction, BCDangle) * maxlen
|
|
|
+ )
|
|
|
+
|
|
|
+ basicCurve(
|
|
|
+ this.canvasContext
|
|
|
+ , Bpoint.x
|
|
|
+ , Bpoint.y
|
|
|
+ , Cpoint.x
|
|
|
+ , Cpoint.y
|
|
|
+ , Bpoint.x + BCP1vector.x
|
|
|
+ , Bpoint.y + BCP1vector.y
|
|
|
+ , Cpoint.x + CCP2vector.x
|
|
|
+ , Cpoint.y + CCP2vector.y
|
|
|
+ )
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if(CDvector.getLength() <= this.lineCurveThreshold){
|
|
|
+ basicLine(
|
|
|
+ this.canvasContext
|
|
|
+ , Cpoint.x
|
|
|
+ , Cpoint.y
|
|
|
+ , Dpoint.x
|
|
|
+ , Dpoint.y
|
|
|
+ )
|
|
|
+ }
|
|
|
+}
|
|
|
+, strokeEndCallback = function(stroke){
|
|
|
+ // this = jSignatureClass instance
|
|
|
+
|
|
|
+ // Here we tidy up things left unfinished in last strokeAddCallback run.
|
|
|
+
|
|
|
+ // What's POTENTIALLY left unfinished there is the curve between the last points
|
|
|
+ // in the stroke, if the len of that line is more than lineCurveThreshold
|
|
|
+ // If the last line was shorter than lineCurveThreshold, it was drawn there, and there
|
|
|
+ // is nothing for us here to do.
|
|
|
+ // We can also be called when there is only one point in the stroke (meaning, the
|
|
|
+ // stroke was just a dot), in which case, again, there is nothing for us to do.
|
|
|
+
|
|
|
+ // So for "this curve" to be calc'ed we need 3 points
|
|
|
+ // A, B, C
|
|
|
+ // and 2 lines:
|
|
|
+ // pre-line (from points A to B),
|
|
|
+ // this line (from points B to C)
|
|
|
+ // Well, actually, we don't need to *know* the point A, just the vector A->B
|
|
|
+ // so, we really need points B, C and AB vector.
|
|
|
+ var positionInStroke = stroke.x.length - 1
|
|
|
+
|
|
|
+ if (positionInStroke > 0){
|
|
|
+ // there are at least 2 points in the stroke.we are in business.
|
|
|
+ var Cpoint = new Point(stroke.x[positionInStroke], stroke.y[positionInStroke])
|
|
|
+ , Bpoint = new Point(stroke.x[positionInStroke-1], stroke.y[positionInStroke-1])
|
|
|
+ , BCvector = Bpoint.getVectorToPoint(Cpoint)
|
|
|
+ , ABvector
|
|
|
+ if (BCvector.getLength() > this.lineCurveThreshold){
|
|
|
+ // yep. This one was left undrawn in prior callback. Have to draw it now.
|
|
|
+ if (positionInStroke > 1){
|
|
|
+ // we have at least 3 elems in stroke
|
|
|
+ ABvector = (new Point(stroke.x[positionInStroke-2], stroke.y[positionInStroke-2])).getVectorToPoint(Bpoint)
|
|
|
+ var BCP1vector = new Vector(ABvector.x + BCvector.x, ABvector.y + BCvector.y).resizeTo(BCvector.getLength() / 2)
|
|
|
+ basicCurve(
|
|
|
+ this.canvasContext
|
|
|
+ , Bpoint.x
|
|
|
+ , Bpoint.y
|
|
|
+ , Cpoint.x
|
|
|
+ , Cpoint.y
|
|
|
+ , Bpoint.x + BCP1vector.x
|
|
|
+ , Bpoint.y + BCP1vector.y
|
|
|
+ , Cpoint.x
|
|
|
+ , Cpoint.y
|
|
|
+ )
|
|
|
+ } else {
|
|
|
+ // Since there is no AB leg, there is no curve to draw. This line is still "long" but no curve.
|
|
|
+ basicLine(
|
|
|
+ this.canvasContext
|
|
|
+ , Bpoint.x
|
|
|
+ , Bpoint.y
|
|
|
+ , Cpoint.x
|
|
|
+ , Cpoint.y
|
|
|
+ )
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+var getDataStats = function(){
|
|
|
+ var strokecnt = strokes.length
|
|
|
+ , stroke
|
|
|
+ , pointid
|
|
|
+ , pointcnt
|
|
|
+ , x, y
|
|
|
+ , maxX = Number.NEGATIVE_INFINITY
|
|
|
+ , maxY = Number.NEGATIVE_INFINITY
|
|
|
+ , minX = Number.POSITIVE_INFINITY
|
|
|
+ , minY = Number.POSITIVE_INFINITY
|
|
|
+ for(strokeid = 0; strokeid < strokecnt; strokeid++){
|
|
|
+ stroke = strokes[strokeid]
|
|
|
+ pointcnt = stroke.length
|
|
|
+ for(pointid = 0; pointid < pointcnt; pointid++){
|
|
|
+ x = stroke.x[pointid]
|
|
|
+ y = stroke.y[pointid]
|
|
|
+ if (x > maxX){
|
|
|
+ maxX = x
|
|
|
+ } else if (x < minX) {
|
|
|
+ minX = x
|
|
|
+ }
|
|
|
+ if (y > maxY){
|
|
|
+ maxY = y
|
|
|
+ } else if (y < minY) {
|
|
|
+ minY = y
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return {'maxX': maxX, 'minX': minX, 'maxY': maxY, 'minY': minY}
|
|
|
+}
|
|
|
+*/
|
|
|
+
|
|
|
+function conditionallyLinkCanvasResizeToWindowResize(jSignatureInstance, settingsWidth, apinamespace, globalEvents){
|
|
|
+ 'use strict'
|
|
|
+ if ( settingsWidth === 'ratio' || settingsWidth.split('')[settingsWidth.length - 1] === '%' ) {
|
|
|
+
|
|
|
+ this.eventTokens[apinamespace + '.parentresized'] = globalEvents.subscribe(
|
|
|
+ apinamespace + '.parentresized'
|
|
|
+ , (function(eventTokens, $parent, originalParentWidth, sizeRatio){
|
|
|
+ 'use strict'
|
|
|
+
|
|
|
+ return function(){
|
|
|
+ 'use strict'
|
|
|
+
|
|
|
+ var w = $parent.width()
|
|
|
+ if (w !== originalParentWidth) {
|
|
|
+
|
|
|
+ // UNsubscribing this particular instance of signature pad only.
|
|
|
+ // there is a separate `eventTokens` per each instance of signature pad
|
|
|
+ for (var key in eventTokens){
|
|
|
+ if (eventTokens.hasOwnProperty(key)) {
|
|
|
+ globalEvents.unsubscribe(eventTokens[key])
|
|
|
+ delete eventTokens[key]
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ var settings = jSignatureInstance.settings
|
|
|
+ jSignatureInstance.$parent.children().remove()
|
|
|
+ for (var key in jSignatureInstance){
|
|
|
+ if (jSignatureInstance.hasOwnProperty(key)) {
|
|
|
+ delete jSignatureInstance[key]
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // scale data to new signature pad size
|
|
|
+ settings.data = (function(data, scale){
|
|
|
+ var newData = []
|
|
|
+ var o, i, l, j, m, stroke
|
|
|
+ for ( i = 0, l = data.length; i < l; i++) {
|
|
|
+ stroke = data[i]
|
|
|
+
|
|
|
+ o = {'x':[],'y':[]}
|
|
|
+
|
|
|
+ for ( j = 0, m = stroke.x.length; j < m; j++) {
|
|
|
+ o.x.push(stroke.x[j] * scale)
|
|
|
+ o.y.push(stroke.y[j] * scale)
|
|
|
+ }
|
|
|
+
|
|
|
+ newData.push(o)
|
|
|
+ }
|
|
|
+ return newData
|
|
|
+ })(
|
|
|
+ settings.data
|
|
|
+ , w * 1.0 / originalParentWidth
|
|
|
+ )
|
|
|
+
|
|
|
+ $parent[apinamespace](settings)
|
|
|
+ }
|
|
|
+ }
|
|
|
+ })(
|
|
|
+ this.eventTokens
|
|
|
+ , this.$parent
|
|
|
+ , this.$parent.width()
|
|
|
+ , this.canvas.width * 1.0 / this.canvas.height
|
|
|
+ )
|
|
|
+ )
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+function jSignatureClass(parent, options, instanceExtensions) {
|
|
|
+
|
|
|
+ var $parent = this.$parent = $(parent)
|
|
|
+ , eventTokens = this.eventTokens = {}
|
|
|
+ , events = this.events = new PubSubClass(this)
|
|
|
+ , globalEvents = $.fn[apinamespace]('globalEvents')
|
|
|
+ , settings = {
|
|
|
+ 'width' : '1160'
|
|
|
+ ,'height' : '450'
|
|
|
+ ,'sizeRatio': 3 // only used when height = 'ratio'
|
|
|
+ ,'color' : '#000'
|
|
|
+ ,'background-color': '#fff'
|
|
|
+ ,'decor-color': '#eee'
|
|
|
+ ,'lineWidth' : 0
|
|
|
+ ,'minFatFingerCompensation' : -10
|
|
|
+ ,'showUndoButton': false
|
|
|
+ ,'data': []
|
|
|
+ }
|
|
|
+
|
|
|
+ $.extend(settings, getColors($parent))
|
|
|
+ if (options) {
|
|
|
+ $.extend(settings, options)
|
|
|
+ }
|
|
|
+ this.settings = settings
|
|
|
+
|
|
|
+ for (var extensionName in instanceExtensions){
|
|
|
+ if (instanceExtensions.hasOwnProperty(extensionName)) {
|
|
|
+ instanceExtensions[extensionName].call(this, extensionName)
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ this.events.publish(apinamespace+'.initializing')
|
|
|
+
|
|
|
+ // these, when enabled, will hover above the sig area. Hence we append them to DOM before canvas.
|
|
|
+ this.$controlbarUpper = (function(){
|
|
|
+ var controlbarstyle = 'padding:0 !important;margin:0 !important;'+
|
|
|
+ 'width: 100% !important; height: 0 !important;'+
|
|
|
+ 'margin-top:-1em !important;margin-bottom:1em !important;'
|
|
|
+ return $('<div style="'+controlbarstyle+'"></div>').appendTo($parent)
|
|
|
+ })();
|
|
|
+
|
|
|
+ this.isCanvasEmulator = false // will be flipped by initializer when needed.
|
|
|
+ var canvas = this.canvas = this.initializeCanvas(settings)
|
|
|
+ , $canvas = $(canvas)
|
|
|
+
|
|
|
+ this.$controlbarLower = (function(){
|
|
|
+ var controlbarstyle = 'padding:0 !important;margin:0 !important;'+
|
|
|
+ 'width: 100% !important; height: 0 !important;'+
|
|
|
+ 'margin-top:-1.5em !important;margin-bottom:1.5em !important;'
|
|
|
+ return $('<div style="'+controlbarstyle+'"></div>').appendTo($parent)
|
|
|
+ })();
|
|
|
+
|
|
|
+ this.canvasContext = canvas.getContext("2d")
|
|
|
+
|
|
|
+ // Most of our exposed API will be looking for this:
|
|
|
+ $canvas.data(apinamespace + '.this', this)
|
|
|
+
|
|
|
+ settings.lineWidth = (function(defaultLineWidth, canvasWidth){
|
|
|
+ if (!defaultLineWidth){
|
|
|
+ return Math.max(
|
|
|
+ Math.round(canvasWidth / 400) /*+1 pixel for every extra 300px of width.*/
|
|
|
+ , 2 /* minimum line width */
|
|
|
+ )
|
|
|
+ } else {
|
|
|
+ return defaultLineWidth
|
|
|
+ }
|
|
|
+ })(settings.lineWidth, canvas.width);
|
|
|
+
|
|
|
+ this.lineCurveThreshold = settings.lineWidth * 3
|
|
|
+
|
|
|
+ // Add custom class if defined
|
|
|
+ if(settings.cssclass && $.trim(settings.cssclass) != "") {
|
|
|
+ $canvas.addClass(settings.cssclass)
|
|
|
+ }
|
|
|
+
|
|
|
+ // used for shifting the drawing point up on touch devices, so one can see the drawing above the finger.
|
|
|
+ this.fatFingerCompensation = 0
|
|
|
+
|
|
|
+ var movementHandlers = (function(jSignatureInstance) {
|
|
|
+
|
|
|
+ //================================
|
|
|
+ // mouse down, move, up handlers:
|
|
|
+
|
|
|
+ // shifts - adjustment values in viewport pixels drived from position of canvas on the page
|
|
|
+ var shiftX
|
|
|
+ , shiftY
|
|
|
+ , setStartValues = function(){
|
|
|
+ var tos = $(jSignatureInstance.canvas).offset()
|
|
|
+ shiftX = tos.left * -1
|
|
|
+ shiftY = tos.top * -1
|
|
|
+ }
|
|
|
+ , getPointFromEvent = function(e) {
|
|
|
+ var firstEvent = (e.changedTouches && e.changedTouches.length > 0 ? e.changedTouches[0] : e)
|
|
|
+ // All devices i tried report correct coordinates in pageX,Y
|
|
|
+ // Android Chrome 2.3.x, 3.1, 3.2., Opera Mobile, safari iOS 4.x,
|
|
|
+ // Windows: Chrome, FF, IE9, Safari
|
|
|
+ // None of that scroll shift calc vs screenXY other sigs do is needed.
|
|
|
+ // ... oh, yeah, the "fatFinger.." is for tablets so that people see what they draw.
|
|
|
+ return new Point(
|
|
|
+ Math.round(firstEvent.pageX + shiftX)
|
|
|
+ , Math.round(firstEvent.pageY + shiftY) + jSignatureInstance.fatFingerCompensation
|
|
|
+ )
|
|
|
+ }
|
|
|
+ , timer = new KickTimerClass(
|
|
|
+ 750
|
|
|
+ , function() { jSignatureInstance.dataEngine.endStroke() }
|
|
|
+ )
|
|
|
+
|
|
|
+ this.drawEndHandler = function(e) {
|
|
|
+ try { e.preventDefault() } catch (ex) {}
|
|
|
+ timer.clear()
|
|
|
+ jSignatureInstance.dataEngine.endStroke()
|
|
|
+ }
|
|
|
+ this.drawStartHandler = function(e) {
|
|
|
+ e.preventDefault()
|
|
|
+ // for performance we cache the offsets
|
|
|
+ // we recalc these only at the beginning the stroke
|
|
|
+ setStartValues()
|
|
|
+ jSignatureInstance.dataEngine.startStroke( getPointFromEvent(e) )
|
|
|
+ timer.kick()
|
|
|
+ }
|
|
|
+ this.drawMoveHandler = function(e) {
|
|
|
+ e.preventDefault()
|
|
|
+ if (!jSignatureInstance.dataEngine.inStroke){
|
|
|
+ return
|
|
|
+ }
|
|
|
+ jSignatureInstance.dataEngine.addToStroke( getPointFromEvent(e) )
|
|
|
+ timer.kick()
|
|
|
+ }
|
|
|
+
|
|
|
+ return this
|
|
|
+
|
|
|
+ }).call( {}, this )
|
|
|
+
|
|
|
+ //
|
|
|
+ //================================
|
|
|
+
|
|
|
+ ;(function(drawEndHandler, drawStartHandler, drawMoveHandler) {
|
|
|
+ var canvas = this.canvas
|
|
|
+ , $canvas = $(canvas)
|
|
|
+ , undef
|
|
|
+ if (this.isCanvasEmulator){
|
|
|
+ $canvas.bind('mousemove.'+apinamespace, drawMoveHandler)
|
|
|
+ $canvas.bind('mouseup.'+apinamespace, drawEndHandler)
|
|
|
+ $canvas.bind('mousedown.'+apinamespace, drawStartHandler)
|
|
|
+ } else {
|
|
|
+ canvas.ontouchstart = function(e) {
|
|
|
+ canvas.onmousedown = undef
|
|
|
+ canvas.onmouseup = undef
|
|
|
+ canvas.onmousemove = undef
|
|
|
+
|
|
|
+ this.fatFingerCompensation = (
|
|
|
+ settings.minFatFingerCompensation &&
|
|
|
+ settings.lineWidth * -3 > settings.minFatFingerCompensation
|
|
|
+ ) ? settings.lineWidth * -3 : settings.minFatFingerCompensation
|
|
|
+
|
|
|
+ drawStartHandler(e)
|
|
|
+
|
|
|
+ canvas.ontouchend = drawEndHandler
|
|
|
+ canvas.ontouchstart = drawStartHandler
|
|
|
+ canvas.ontouchmove = drawMoveHandler
|
|
|
+ }
|
|
|
+ canvas.onmousedown = function(e) {
|
|
|
+ canvas.ontouchstart = undef
|
|
|
+ canvas.ontouchend = undef
|
|
|
+ canvas.ontouchmove = undef
|
|
|
+
|
|
|
+ drawStartHandler(e)
|
|
|
+
|
|
|
+ canvas.onmousedown = drawStartHandler
|
|
|
+ canvas.onmouseup = drawEndHandler
|
|
|
+ canvas.onmousemove = drawMoveHandler
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }).call(
|
|
|
+ this
|
|
|
+ , movementHandlers.drawEndHandler
|
|
|
+ , movementHandlers.drawStartHandler
|
|
|
+ , movementHandlers.drawMoveHandler
|
|
|
+ )
|
|
|
+
|
|
|
+ //=========================================
|
|
|
+ // various event handlers
|
|
|
+
|
|
|
+ // on mouseout + mouseup canvas did not know that mouseUP fired. Continued to draw despite mouse UP.
|
|
|
+ // it is bettr than
|
|
|
+ // $canvas.bind('mouseout', drawEndHandler)
|
|
|
+ // because we don't want to break the stroke where user accidentally gets ouside and wants to get back in quickly.
|
|
|
+ eventTokens[apinamespace + '.windowmouseup'] = globalEvents.subscribe(
|
|
|
+ apinamespace + '.windowmouseup'
|
|
|
+ , movementHandlers.drawEndHandler
|
|
|
+ )
|
|
|
+
|
|
|
+ this.events.publish(apinamespace+'.attachingEventHandlers')
|
|
|
+
|
|
|
+ // If we have proportional width, we sign up to events broadcasting "window resized" and checking if
|
|
|
+ // parent's width changed. If so, we (1) extract settings + data from current signature pad,
|
|
|
+ // (2) remove signature pad from parent, and (3) reinit new signature pad at new size with same settings, (rescaled) data.
|
|
|
+ conditionallyLinkCanvasResizeToWindowResize.call(
|
|
|
+ this
|
|
|
+ , this
|
|
|
+ , settings.width.toString(10)
|
|
|
+ , apinamespace, globalEvents
|
|
|
+ )
|
|
|
+
|
|
|
+ // end of event handlers.
|
|
|
+ // ===============================
|
|
|
+
|
|
|
+ this.resetCanvas(settings.data)
|
|
|
+
|
|
|
+ // resetCanvas renders the data on the screen and fires ONE "change" event
|
|
|
+ // if there is data. If you have controls that rely on "change" firing
|
|
|
+ // attach them to something that runs before this.resetCanvas, like
|
|
|
+ // apinamespace+'.attachingEventHandlers' that fires a bit higher.
|
|
|
+ this.events.publish(apinamespace+'.initialized')
|
|
|
+
|
|
|
+ return this
|
|
|
+} // end of initBase
|
|
|
+
|
|
|
+//=========================================================================
|
|
|
+// jSignatureClass's methods and supporting fn's
|
|
|
+
|
|
|
+jSignatureClass.prototype.resetCanvas = function(data){
|
|
|
+ var canvas = this.canvas
|
|
|
+ , settings = this.settings
|
|
|
+ , ctx = this.canvasContext
|
|
|
+ , isCanvasEmulator = this.isCanvasEmulator
|
|
|
+
|
|
|
+ , cw = canvas.width
|
|
|
+ , ch = canvas.height
|
|
|
+
|
|
|
+ // preparing colors, drawing area
|
|
|
+
|
|
|
+ ctx.clearRect(0, 0, cw + 30, ch + 30)
|
|
|
+
|
|
|
+ ctx.shadowColor = ctx.fillStyle = settings['background-color']
|
|
|
+ if (isCanvasEmulator){
|
|
|
+ // FLashCanvas fills with Black by default, covering up the parent div's background
|
|
|
+ // hence we refill
|
|
|
+ ctx.fillRect(0,0,cw + 30, ch + 30)
|
|
|
+ }
|
|
|
+
|
|
|
+ ctx.lineWidth = Math.ceil(parseInt(settings.lineWidth, 10))
|
|
|
+ ctx.lineCap = ctx.lineJoin = "round"
|
|
|
+
|
|
|
+ // signature line
|
|
|
+ //ctx.strokeStyle = settings['decor-color']
|
|
|
+ //ctx.shadowOffsetX = 0
|
|
|
+ //ctx.shadowOffsetY = 0
|
|
|
+ //var lineoffset = Math.round( ch / 5 )
|
|
|
+ //basicLine(ctx, lineoffset * 1.5, ch - lineoffset, cw - (lineoffset * 1.5), ch - lineoffset)
|
|
|
+ //ctx.strokeStyle = settings.color
|
|
|
+
|
|
|
+ //if (!isCanvasEmulator){
|
|
|
+ // ctx.shadowColor = ctx.strokeStyle
|
|
|
+ // ctx.shadowOffsetX = ctx.lineWidth * 0.5
|
|
|
+ // ctx.shadowOffsetY = ctx.lineWidth * -0.6
|
|
|
+ // ctx.shadowBlur = 0
|
|
|
+ //}
|
|
|
+
|
|
|
+ ctx.strokeStyle = settings.color;
|
|
|
+ // setting up new dataEngine
|
|
|
+
|
|
|
+ if (!data) { data = [] }
|
|
|
+
|
|
|
+ var dataEngine = this.dataEngine = new DataEngine(
|
|
|
+ data
|
|
|
+ , this
|
|
|
+ , strokeStartCallback
|
|
|
+ , strokeAddCallback
|
|
|
+ , strokeEndCallback
|
|
|
+ )
|
|
|
+
|
|
|
+ settings.data = data // onwindowresize handler uses it, i think.
|
|
|
+ $(canvas).data(apinamespace+'.data', data)
|
|
|
+ .data(apinamespace+'.settings', settings)
|
|
|
+
|
|
|
+ // we fire "change" event on every change in data.
|
|
|
+ // setting this up:
|
|
|
+ dataEngine.changed = (function(target, events, apinamespace) {
|
|
|
+ 'use strict'
|
|
|
+ return function() {
|
|
|
+ events.publish(apinamespace+'.change')
|
|
|
+ target.trigger('change')
|
|
|
+ }
|
|
|
+ })(this.$parent, this.events, apinamespace)
|
|
|
+ // let's trigger change on all data reloads
|
|
|
+ dataEngine.changed()
|
|
|
+
|
|
|
+ // import filters will be passing this back as indication of "we rendered"
|
|
|
+ return true
|
|
|
+}
|
|
|
+
|
|
|
+function initializeCanvasEmulator(canvas){
|
|
|
+ if (canvas.getContext){
|
|
|
+ return false
|
|
|
+ } else {
|
|
|
+ // for cases when jSignature, FlashCanvas is inserted
|
|
|
+ // from one window into another (child iframe)
|
|
|
+ // 'window' and 'FlashCanvas' may be stuck behind
|
|
|
+ // in that other parent window.
|
|
|
+ // we need to find it
|
|
|
+ var window = canvas.ownerDocument.parentWindow
|
|
|
+ var FC = window.FlashCanvas ?
|
|
|
+ canvas.ownerDocument.parentWindow.FlashCanvas :
|
|
|
+ (
|
|
|
+ typeof FlashCanvas === "undefined" ?
|
|
|
+ undefined :
|
|
|
+ FlashCanvas
|
|
|
+ )
|
|
|
+
|
|
|
+ if (FC) {
|
|
|
+ canvas = FC.initElement(canvas)
|
|
|
+
|
|
|
+ var zoom = 1
|
|
|
+ // FlashCanvas uses flash which has this annoying habit of NOT scaling with page zoom.
|
|
|
+ // It matches pixel-to-pixel to screen instead.
|
|
|
+ // Since we are targeting ONLY IE 7, 8 with FlashCanvas, we will test the zoom only the IE8, IE7 way
|
|
|
+ if (window && window.screen && window.screen.deviceXDPI && window.screen.logicalXDPI){
|
|
|
+ zoom = window.screen.deviceXDPI * 1.0 / window.screen.logicalXDPI
|
|
|
+ }
|
|
|
+ if (zoom !== 1){
|
|
|
+ try {
|
|
|
+ // We effectively abuse the brokenness of FlashCanvas and force the flash rendering surface to
|
|
|
+ // occupy larger pixel dimensions than the wrapping, scaled up DIV and Canvas elems.
|
|
|
+ $(canvas).children('object').get(0).resize(Math.ceil(canvas.width * zoom), Math.ceil(canvas.height * zoom))
|
|
|
+ // And by applying "scale" transformation we can talk "browser pixels" to FlashCanvas
|
|
|
+ // and have it translate the "browser pixels" to "screen pixels"
|
|
|
+ canvas.getContext('2d').scale(zoom, zoom)
|
|
|
+ // Note to self: don't reuse Canvas element. Repeated "scale" are cumulative.
|
|
|
+ } catch (ex) {}
|
|
|
+ }
|
|
|
+ return true
|
|
|
+ } else {
|
|
|
+ throw new Error("Canvas element does not support 2d context. jSignature cannot proceed.")
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+}
|
|
|
+
|
|
|
+jSignatureClass.prototype.initializeCanvas = function(settings) {
|
|
|
+ // ===========
|
|
|
+ // Init + Sizing code
|
|
|
+
|
|
|
+ var canvas = document.createElement('canvas')
|
|
|
+ , $canvas = $(canvas)
|
|
|
+
|
|
|
+ // We cannot work with circular dependency
|
|
|
+ if (settings.width === settings.height && settings.height === 'ratio') {
|
|
|
+ settings.width = '100%'
|
|
|
+ }
|
|
|
+
|
|
|
+ $canvas.css(
|
|
|
+ 'margin'
|
|
|
+ , 0
|
|
|
+ ).css(
|
|
|
+ 'padding'
|
|
|
+ , 0
|
|
|
+ ).css(
|
|
|
+ 'border'
|
|
|
+ , 'none'
|
|
|
+ ).css(
|
|
|
+ 'height'
|
|
|
+ , settings.height === 'ratio' || !settings.height ? 1 : settings.height.toString(10)
|
|
|
+ ).css(
|
|
|
+ 'width'
|
|
|
+ , settings.width === 'ratio' || !settings.width ? 1 : settings.width.toString(10)
|
|
|
+ )
|
|
|
+
|
|
|
+ $canvas.appendTo(this.$parent)
|
|
|
+
|
|
|
+ // we could not do this until canvas is rendered (appended to DOM)
|
|
|
+ if (settings.height === 'ratio') {
|
|
|
+ $canvas.css(
|
|
|
+ 'height'
|
|
|
+ , Math.round( $canvas.width() / settings.sizeRatio )
|
|
|
+ )
|
|
|
+ } else if (settings.width === 'ratio') {
|
|
|
+ $canvas.css(
|
|
|
+ 'width'
|
|
|
+ , Math.round( $canvas.height() * settings.sizeRatio )
|
|
|
+ )
|
|
|
+ }
|
|
|
+
|
|
|
+ $canvas.addClass(apinamespace)
|
|
|
+
|
|
|
+ // canvas's drawing area resolution is independent from canvas's size.
|
|
|
+ // pixels are just scaled up or down when internal resolution does not
|
|
|
+ // match external size. So...
|
|
|
+
|
|
|
+ canvas.width = $canvas.width()
|
|
|
+ canvas.height = $canvas.height()
|
|
|
+
|
|
|
+ // Special case Sizing code
|
|
|
+
|
|
|
+ this.isCanvasEmulator = initializeCanvasEmulator(canvas)
|
|
|
+
|
|
|
+ // End of Sizing Code
|
|
|
+ // ===========
|
|
|
+
|
|
|
+ // normally select preventer would be short, but
|
|
|
+ // Canvas emulator on IE does NOT provide value for Event. Hence this convoluted line.
|
|
|
+ canvas.onselectstart = function(e){if(e && e.preventDefault){e.preventDefault()}; if(e && e.stopPropagation){e.stopPropagation()}; return false;}
|
|
|
+
|
|
|
+ return canvas
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+var GlobalJSignatureObjectInitializer = function(window){
|
|
|
+
|
|
|
+ var globalEvents = new PubSubClass()
|
|
|
+
|
|
|
+ // common "window resized" event listener.
|
|
|
+ // jSignature instances will subscribe to this chanel.
|
|
|
+ // to resize themselves when needed.
|
|
|
+ ;(function(globalEvents, apinamespace, $, window){
|
|
|
+ 'use strict'
|
|
|
+
|
|
|
+ var resizetimer
|
|
|
+ , runner = function(){
|
|
|
+ globalEvents.publish(
|
|
|
+ apinamespace + '.parentresized'
|
|
|
+ )
|
|
|
+ }
|
|
|
+
|
|
|
+ // jSignature knows how to resize its content when its parent is resized
|
|
|
+ // window resize is the only way we can catch resize events though...
|
|
|
+ $(window).bind('resize.'+apinamespace, function(){
|
|
|
+ if (resizetimer) {
|
|
|
+ clearTimeout(resizetimer)
|
|
|
+ }
|
|
|
+ resizetimer = setTimeout(
|
|
|
+ runner
|
|
|
+ , 500
|
|
|
+ )
|
|
|
+ })
|
|
|
+ // when mouse exists canvas element and "up"s outside, we cannot catch it with
|
|
|
+ // callbacks attached to canvas. This catches it outside.
|
|
|
+ .bind('mouseup.'+apinamespace, function(e){
|
|
|
+ globalEvents.publish(
|
|
|
+ apinamespace + '.windowmouseup'
|
|
|
+ )
|
|
|
+ })
|
|
|
+
|
|
|
+ })(globalEvents, apinamespace, $, window)
|
|
|
+
|
|
|
+ var jSignatureInstanceExtensions = {
|
|
|
+ /*
|
|
|
+ 'exampleExtension':function(extensionName){
|
|
|
+ // we are called very early in instance's life.
|
|
|
+ // right after the settings are resolved and
|
|
|
+ // jSignatureInstance.events is created
|
|
|
+ // and right before first ("jSignature.initializing") event is called.
|
|
|
+ // You don't really need to manupilate
|
|
|
+ // jSignatureInstance directly, just attach
|
|
|
+ // a bunch of events to jSignatureInstance.events
|
|
|
+ // (look at the source of jSignatureClass to see when these fire)
|
|
|
+ // and your special pieces of code will attach by themselves.
|
|
|
+
|
|
|
+ // this function runs every time a new instance is set up.
|
|
|
+ // this means every var you create will live only for one instance
|
|
|
+ // unless you attach it to something outside, like "window."
|
|
|
+ // and pick it up later from there.
|
|
|
+
|
|
|
+ // when globalEvents' events fire, 'this' is globalEvents object
|
|
|
+ // when jSignatureInstance's events fire, 'this' is jSignatureInstance
|
|
|
+
|
|
|
+ // Here,
|
|
|
+ // this = is new jSignatureClass's instance.
|
|
|
+
|
|
|
+ // The way you COULD approch setting this up is:
|
|
|
+ // if you have multistep set up, attach event to "jSignature.initializing"
|
|
|
+ // that attaches other events to be fired further lower the init stream.
|
|
|
+ // Or, if you know for sure you rely on only one jSignatureInstance's event,
|
|
|
+ // just attach to it directly
|
|
|
+
|
|
|
+ this.events.subscribe(
|
|
|
+ // name of the event
|
|
|
+ apinamespace + '.initializing'
|
|
|
+ // event handlers, can pass args too, but in majority of cases,
|
|
|
+ // 'this' which is jSignatureClass object instance pointer is enough to get by.
|
|
|
+ , function(){
|
|
|
+ if (this.settings.hasOwnProperty('non-existent setting category?')) {
|
|
|
+ console.log(extensionName + ' is here')
|
|
|
+ }
|
|
|
+ }
|
|
|
+ )
|
|
|
+ }
|
|
|
+ */
|
|
|
+ }
|
|
|
+
|
|
|
+ var exportplugins = {
|
|
|
+ 'default':function(data){return this.toDataURL()}
|
|
|
+ , 'native':function(data){return data}
|
|
|
+ , 'image':function(data){
|
|
|
+ /*this = canvas elem */
|
|
|
+ var imagestring = this.toDataURL()
|
|
|
+
|
|
|
+ if (typeof imagestring === 'string' &&
|
|
|
+ imagestring.length > 4 &&
|
|
|
+ imagestring.slice(0,5) === 'data:' &&
|
|
|
+ imagestring.indexOf(',') !== -1){
|
|
|
+
|
|
|
+ var splitterpos = imagestring.indexOf(',')
|
|
|
+
|
|
|
+ return [
|
|
|
+ imagestring.slice(5, splitterpos)
|
|
|
+ , imagestring.substr(splitterpos + 1)
|
|
|
+ ]
|
|
|
+ }
|
|
|
+ return []
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // will be part of "importplugins"
|
|
|
+ function _renderImageOnCanvas( data, formattype, rerendercallable ) {
|
|
|
+ 'use strict'
|
|
|
+ // #1. Do NOT rely on this. No worky on IE
|
|
|
+ // (url max len + lack of base64 decoder + possibly other issues)
|
|
|
+ // #2. This does NOT affect what is captured as "signature" as far as vector data is
|
|
|
+ // concerned. This is treated same as "signature line" - i.e. completely ignored
|
|
|
+ // the only time you see imported image data exported is if you export as image.
|
|
|
+
|
|
|
+ // we do NOT call rerendercallable here (unlike in other import plugins)
|
|
|
+ // because importing image does absolutely nothing to the underlying vector data storage
|
|
|
+ // This could be a way to "import" old signatures stored as images
|
|
|
+ // This could also be a way to import extra decor into signature area.
|
|
|
+
|
|
|
+ var img = new Image()
|
|
|
+ // this = Canvas DOM elem. Not jQuery object. Not Canvas's parent div.
|
|
|
+ , c = this
|
|
|
+
|
|
|
+ img.onload = function() {
|
|
|
+ var ctx = c.getContext("2d").drawImage(
|
|
|
+ img, 0, 0
|
|
|
+ , ( img.width < c.width) ? img.width : c.width
|
|
|
+ , ( img.height < c.height) ? img.height : c.height
|
|
|
+ )
|
|
|
+ }
|
|
|
+
|
|
|
+ img.src = 'data:' + formattype + ',' + data
|
|
|
+ }
|
|
|
+
|
|
|
+ var importplugins = {
|
|
|
+ 'native':function(data, formattype, rerendercallable){
|
|
|
+ // we expect data as Array of objects of arrays here - whatever 'default' EXPORT plugin spits out.
|
|
|
+ // returning Truthy to indicate we are good, all updated.
|
|
|
+ rerendercallable( data )
|
|
|
+ }
|
|
|
+ , 'image': _renderImageOnCanvas
|
|
|
+ , 'image/png;base64': _renderImageOnCanvas
|
|
|
+ , 'image/jpeg;base64': _renderImageOnCanvas
|
|
|
+ , 'image/jpg;base64': _renderImageOnCanvas
|
|
|
+ }
|
|
|
+
|
|
|
+ function _clearDrawingArea( data ) {
|
|
|
+ this.find('canvas.'+apinamespace)
|
|
|
+ .add(this.filter('canvas.'+apinamespace))
|
|
|
+ .data(apinamespace+'.this').resetCanvas( data )
|
|
|
+ return this
|
|
|
+ }
|
|
|
+
|
|
|
+ function _setDrawingData( data, formattype ) {
|
|
|
+ var undef
|
|
|
+
|
|
|
+ if (formattype === undef && typeof data === 'string' && data.substr(0,5) === 'data:') {
|
|
|
+ formattype = data.slice(5).split(',')[0]
|
|
|
+ // 5 chars of "data:" + mimetype len + 1 "," char = all skipped.
|
|
|
+ data = data.slice(6 + formattype.length)
|
|
|
+ if (formattype === data) return
|
|
|
+ }
|
|
|
+
|
|
|
+ var $canvas = this.find('canvas.'+apinamespace).add(this.filter('canvas.'+apinamespace))
|
|
|
+
|
|
|
+ if (!importplugins.hasOwnProperty(formattype)){
|
|
|
+ throw new Error(apinamespace + " is unable to find import plugin with for format '"+ String(formattype) +"'")
|
|
|
+ } else if ($canvas.length !== 0){
|
|
|
+ importplugins[formattype].call(
|
|
|
+ $canvas[0]
|
|
|
+ , data
|
|
|
+ , formattype
|
|
|
+ , (function(jSignatureInstance){
|
|
|
+ return function(){ return jSignatureInstance.resetCanvas.apply(jSignatureInstance, arguments) }
|
|
|
+ })($canvas.data(apinamespace+'.this'))
|
|
|
+ )
|
|
|
+ }
|
|
|
+
|
|
|
+ return this
|
|
|
+ }
|
|
|
+
|
|
|
+ var elementIsOrphan = function(e){
|
|
|
+ var topOfDOM = false
|
|
|
+ e = e.parentNode
|
|
|
+ while (e && !topOfDOM){
|
|
|
+ topOfDOM = e.body
|
|
|
+ e = e.parentNode
|
|
|
+ }
|
|
|
+ return !topOfDOM
|
|
|
+ }
|
|
|
+
|
|
|
+ //These are exposed as methods under $obj.jSignature('methodname', *args)
|
|
|
+ var plugins = {'export':exportplugins, 'import':importplugins, 'instance': jSignatureInstanceExtensions}
|
|
|
+ , methods = {
|
|
|
+ 'init' : function( options ) {
|
|
|
+ return this.each( function() {
|
|
|
+ if (!elementIsOrphan(this)) {
|
|
|
+ new jSignatureClass(this, options, jSignatureInstanceExtensions)
|
|
|
+ }
|
|
|
+ })
|
|
|
+ }
|
|
|
+ , 'getSettings' : function() {
|
|
|
+ return this.find('canvas.'+apinamespace)
|
|
|
+ .add(this.filter('canvas.'+apinamespace))
|
|
|
+ .data(apinamespace+'.this').settings
|
|
|
+ }
|
|
|
+ // around since v1
|
|
|
+ , 'clear' : _clearDrawingArea
|
|
|
+ // was mistakenly introduced instead of 'clear' in v2
|
|
|
+ , 'reset' : _clearDrawingArea
|
|
|
+ , 'addPlugin' : function(pluginType, pluginName, callable){
|
|
|
+ if (plugins.hasOwnProperty(pluginType)){
|
|
|
+ plugins[pluginType][pluginName] = callable
|
|
|
+ }
|
|
|
+ return this
|
|
|
+ }
|
|
|
+ , 'listPlugins' : function(pluginType){
|
|
|
+ var answer = []
|
|
|
+ if (plugins.hasOwnProperty(pluginType)){
|
|
|
+ var o = plugins[pluginType]
|
|
|
+ for (var k in o){
|
|
|
+ if (o.hasOwnProperty(k)){
|
|
|
+ answer.push(k)
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return answer
|
|
|
+ }
|
|
|
+ , 'getData' : function( formattype ) {
|
|
|
+ var undef, $canvas=this.find('canvas.'+apinamespace).add(this.filter('canvas.'+apinamespace))
|
|
|
+ if (formattype === undef) formattype = 'default'
|
|
|
+ if ($canvas.length !== 0 && exportplugins.hasOwnProperty(formattype)){
|
|
|
+ return exportplugins[formattype].call(
|
|
|
+ $canvas.get(0) // canvas dom elem
|
|
|
+ , $canvas.data(apinamespace+'.data') // raw signature data as array of objects of arrays
|
|
|
+ )
|
|
|
+ }
|
|
|
+ }
|
|
|
+ // around since v1. Took only one arg - data-url-formatted string with (likely png of) signature image
|
|
|
+ , 'importData' : _setDrawingData
|
|
|
+ // was mistakenly introduced instead of 'importData' in v2
|
|
|
+ , 'setData' : _setDrawingData
|
|
|
+ // this is one and same instance for all jSignature.
|
|
|
+ , 'globalEvents' : function(){return globalEvents}
|
|
|
+ // there will be a separate one for each jSignature instance.
|
|
|
+ , 'events' : function() {
|
|
|
+ return this.find('canvas.'+apinamespace)
|
|
|
+ .add(this.filter('canvas.'+apinamespace))
|
|
|
+ .data(apinamespace+'.this').events
|
|
|
+ }
|
|
|
+ } // end of methods declaration.
|
|
|
+
|
|
|
+ $.fn[apinamespace] = function(method) {
|
|
|
+ 'use strict'
|
|
|
+ if ( !method || typeof method === 'object' ) {
|
|
|
+ return methods.init.apply( this, arguments )
|
|
|
+ } else if ( typeof method === 'string' && methods[method] ) {
|
|
|
+ return methods[method].apply( this, Array.prototype.slice.call( arguments, 1 ))
|
|
|
+ } else {
|
|
|
+ $.error( 'Method ' + String(method) + ' does not exist on jQuery.' + apinamespace )
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+} // end of GlobalJSignatureObjectInitializer
|
|
|
+
|
|
|
+GlobalJSignatureObjectInitializer(window)
|
|
|
+
|
|
|
+})();
|
