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Begin work on not requiring an existing <canvas> element - create a new one off the viewport (visibility: hidden'd) for each new franz generated. Basic work on a draw() method that accepts an id for an existing <canvas> and will re-draw the image to that. This allows the library to remain pure with any image dealings, but gives the user control over redraw if they so desire it

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Veno Server 2009-10-22 00:39:03 -05:00
parent 8e985309ff
commit b7d697f992
1 changed files with 79 additions and 10 deletions
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89
js/franz.js
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@ -31,11 +31,24 @@ var franz = function(franzProps) {
assume that anything occuring after getColors() is back in global-browser-use land.
*/
this.canvas_id = franzProps.canvas;
if(typeof document.getElementById(franzProps.canvas).getContext === "function") {
/* Canvas is natively supported, go down the normal path... */
this.canvas = document.getElementById(franzProps.canvas);
if(typeof document.createElement("canvas").getContext === "function") {
/* Canvas is natively supported, go down the normal path... append a new canvas off the viewport and draw our image onto it */
this.src = franzProps.src;
this.canvas = document.createElement("canvas");
this.canvas.width = 100;
this.canvas.height = 100;
this.canvas.style.visibility = "hidden";
this.canvas.style.position = "absolute";
this.canvas.style.top = 0 + "px";
this.canvas.style.left = "-" + 1000 + "px";
this.ctx = this.canvas.getContext('2d');
if(typeof franzProps.callback !== "undefined" && typeof franzProps.callback === "function") franzProps.callback();
var that = this;
franz.util.loadEvent(function() {
document.body.appendChild(that.canvas);
that.draw();
if(typeof franzProps.callback !== "undefined" && typeof franzProps.callback === "function") franzProps.callback();
});
} else {
/* We're dealing with something that belongs in an old folks home; throw in the life support. (Embed Flash junk) :(
Inject SWFObject so we can deal with Flash embedding in a sane manner...
@ -44,7 +57,7 @@ var franz = function(franzProps) {
var newScript = document.createElement("script");
newScript.type = "text/javascript";
newScript.src = "/js/swfobject.js";
document.body.appendChild(newScript);
document.getElementsByTagName("head")[0].appendChild(newScript);
if(typeof franzProps.callback !== "undefined" && typeof franzProps.callback === "function") {
// Catch the callback function for IE...
@ -80,15 +93,23 @@ franz.prototype = {
origIndex: [],
loadImg: function(img_src) {
extra_canvas: null,
extra_ctx: null,
draw: function(different_canvas) {
/* If you're looking for the non-<canvas> portion of this, check the associated Flash files. */
var working = this;
if(typeof different_canvas !== "undefined" && typeof different_canvas === "string") {
this.extra_canvas = document.getElementById(different_canvas);
this.extra_ctx = this.extra_canvas.getContext('2d');
}
var working = this;
working.img = new Image();
working.img.onload = function() {
working.ctx.drawImage(working.img, 0, 0, 100, 100);
(working.extra_ctx === null ? working.ctx : working.extra_ctx).drawImage(working.img, 0, 0, 100, 100);
setTimeout(function() { working.getColors(); }, 100);
}
working.img.src = img_src;
working.img.src = this.src;
},
getColors: function() {
@ -313,5 +334,53 @@ franz.util = {
}
return '#' + hex.join('');
}
},
loadEvent: function(func) {
if(typeof jQuery != "undefined") jQuery(document).ready(function() { func(); });
else franz.util.fallback_loadEvent(function() { func(); });
},
fallback_loadEvent: (function() {
var load_events = [], load_timer, script, done, exec, old_onload,
init = function () {
done = true;
clearInterval(load_timer);
for(i = 0; i < load_events.length; i++) {
exec = load_events.shift();
exec();
}
if(script) script.onreadystatechange = '';
};
return function(func) {
if(done) return func();
if(!load_events[0]) {
if(document.addEventListener) document.addEventListener("DOMContentLoaded", init, false);
/*@cc_on @*/ /*@if (@_win32) // Fairly obvious who this is for...
document.write("<script id=__ie_onload defer src=//0><\/scr"+"ipt>");
script = document.getElementById("__ie_onload");
script.onreadystatechange = function() {
if (this.readyState == "complete") init(); // call the onload handler
};
/*@end @*/
if(/WebKit/i.test(navigator.userAgent)) {
load_timer = setInterval(function() {
if (/loaded|complete/.test(document.readyState)) init();
}, 10);
}
old_onload = window.onload;
window.onload = function() {
init();
if (old_onload) old_onload();
};
}
load_events.push(func);
}
})()
}