By Zevan | March 19, 2009
Actionscript:
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var Box:Function = {
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constructor : function(color:uint, w:Number, h:Number):void {
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this.color = color;
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this.s = new Shape();
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with(this.s.graphics) beginFill(this.color), drawRect(0,0,w,h);
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addChild(this.s);
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this.setLoc = function(x:Number, y:Number):void{
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this.s.x = x;
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this.s.y = y;
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}
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}
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}.constructor;
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var box0:Object = new Box(0xFF0000, 100, 100);
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box0.setLoc(100, 10);
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var box1:Object = new Box(0x000000, 50, 50);
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box1.setLoc(210, 10);
This snippet makes use of Object.constructor() to allow creation of Object instances using the new keyword. This is for fun only, I don't recommend this over actual Classes.
Also posted in OOP, functions, misc | Tagged actionscript, flash |
By Zevan | February 22, 2009
Actionscript:
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addChild(new TextField());
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getChildAt(0)["text"] = "Hello World";
Notice that square bracket syntax makes it so we don't need to typecast. Take a look at the other way:
Actionscript:
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addChild(new TextField());
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TextField(getChildAt(0)).text = "Hello World";
Typecasting is the way to go.... the square bracket technique is just an interesting trick.
I wrote this after somehow stumbling on this very entertaining page - it shows hello world written in approximately 200 different languages...
Also posted in misc | Tagged actionscript, flash |
By Zevan | February 9, 2009
Actionscript:
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var obj:Object = {name: "Joe", hobby: "Guitar", age:"80"};
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if ("name" in obj){
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trace(obj, " has a name property");
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}
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if ("x" in obj == false){
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trace(obj, " doesn't have an x property");
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}
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var mySprite:Sprite = new Sprite();
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if ("currentFrame" in mySprite == false){
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trace(mySprite, "does not have a currentFrame property");
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}
The "in" operator can be used to check if an object has a specific property. In the above example I test a standard Object instance and a Sprite instance for a few different properties.
I could see this operator being used when dealing with * (wildcard) datatypes and dynamic style code....
Also posted in Operators | Tagged actionscript, flash |
By Zevan | February 6, 2009
Actionscript:
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// for simplicity I left this XML inline, this will work exactly the same if it were external
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var program:XML=<body>
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<draw>
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<![CDATA[
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beginFill(0xFF0000);
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drawCircle(100,100,50);
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endFill();
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lineStyle(0, 0x666666);
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moveTo(100, 100);
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lineTo(200, 200);
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moveTo(300, 200);
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curveTo(350, 300, 400, 200);
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lineStyle(0, 0x0000FF);
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drawRect(200, 50,100,100) ;
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]]>
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</draw>
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</body>;
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// parse and run the Graphics class commands from the XML
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render(parseFunctions(program.draw.toString()));
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function parseFunctions(dat:String):Array{
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var a:Array = dat.split(";") ;
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for (var i:int = 0; i<a.length-1; i++){
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a[i] = a[i].split(/\(\)|\(|\)/g);
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var f:String = a[i][0] = a[i][0].replace(/\s/g,"");
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a[i] = a[i].splice(0, a[i].length - 1);
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if (a[i].length> 1){
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a[i] = a[i][1].split(",");
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a[i].unshift(f);
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}
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}
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return a.splice(0,a.length - 1);
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}
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function render(p:Array):void {
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for (var i:int = 0; i<p.length; i++) {
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graphics[p[i][0]].apply(graphics,p[i].splice(1));
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}
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}
The above code builds on yesterdays post by showing how one could potentially store graphics class method calls in XML using a few regular expressions and Function.apply().
The parseFunctions() function reads through the CDATA string and formats it in a 2D array that looks like this:
Actionscript:
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[[beginFill, 0xFF0000], [drawCircle, 100, 100, 50], etc...]
The render() function reads through this 2D array, using the first value of each nested array as the function and the remaining values as arguments...
As is this won't really work with most of the new fp10 graphics methods...