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as3 Full Background Image Class

/ Published in: ActionScript 3
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Full Background class with min. width and height

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  1. package com.jasonhulbert.display{
  2. 	import flash.events.Event;
  3. 	import flash.display.Sprite;
  4. 	import flash.display.Bitmap;
  5. 	import flash.display.Loader;
  6. 	import flash.net.URLRequest;
  7. 	import flash.errors.IOError;
  8. 	import flash.events.IOErrorEvent;
  9. 	import flash.display.StageScaleMode;
  10. 	import flash.display.StageAlign;
  11.  
  12. 	public class FullBackground extends Sprite {
  13.  
  14. 		var ldr:Loader;
  15. 		var ldrReq:URLRequest;
  16. 		var bmp:Bitmap;
  17.  
  18. 		var minW:Number;
  19. 		var minH:Number;
  20.  
  21. 		var stageW:Number;
  22. 		var stageH:Number;
  23. 		var scaler:Number;
  24.  
  25. 		public function FullBackground(_imageURL:String, _minW:Number, _minH:Number) {
  26. 			minW = _minW;
  27. 			minH = _minH;
  28.  
  29. 			ldr = new Loader  ;
  30. 			ldrReq = new URLRequest(_imageURL);
  31. 			ldr.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoaded);
  32. 			ldr.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, onIOError);
  33. 			addEventListener(Event.ADDED_TO_STAGE, onAdd);
  34. 		}
  35.  
  36. 		private function onAdd(event:Event):void {
  37. 			stage.scaleMode = StageScaleMode.NO_SCALE;
  38. 			stage.align = StageAlign.TOP_LEFT;
  39. 			stage.addEventListener(Event.RESIZE, onStageResize);
  40. 			ldr.load(ldrReq);
  41. 		}
  42.  
  43. 		private function onLoaded(event:Event):void {
  44. 			bmp = Bitmap(ldr.content);
  45. 			bmp.smoothing = true;
  46. 			addChild(bmp);
  47.  
  48. 			resizeImage();
  49. 		}
  50.  
  51. 		private function onIOError(event:IOErrorEvent):void {
  52. 			trace("Error loading background image: " + event);
  53. 		}
  54.  
  55. 		private function resizeImage():void {
  56. 			stageW = stage.stageWidth;
  57. 			stageH = stage.stageHeight;
  58.  
  59. 			if (stageH / stageW > this.height / this.width) {
  60. 				scaler = this.width / this.height;
  61. 				this.width = stageH * scaler;
  62. 				this.height = stageH;
  63. 			} else {
  64. 				scaler = this.height / this.width;
  65. 				this.height = stageW * scaler;
  66. 				this.width = stageW;
  67. 			}
  68. 			this.x = (stageW / 2) - (this.width / 2);
  69. 			this.y = 0;
  70. 		}
  71.  
  72. 		private function onStageResize(event:Event):void {
  73. 			resizeImage();
  74. 		}
  75.  
  76. 	}
  77.  
  78. }

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