scrollbitmapdata.as

Papervision3d的源码

/**
 * Copyright (c) 2008 Bartek Drozdz (http://www.everydayflash.com)
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */
package com.everydayflash.bitmap {
	
	import flash.display.BitmapData;
	import flash.geom.Point;
	import flash.geom.Rectangle;

	public class ScrollBitmapData extends BitmapData {

		private var source:BitmapData;
		private var zero:Point = new Point(0, 0);
		
		private var dx:int;
		private var dy:int;
		private var w:int;
		private var h:int;
		
		public function ScrollBitmapData(width:int, height:int, transparent:Boolean = true, fillColor:uint = 0xFFFFFFFF) {
			super(width, height, transparent, fillColor);
			dx = 0;
			dy = 0;
		}
		
		public function setSource(source:BitmapData):void {
			this.source = source;
			w = source.width;
			h = source.height;
			copyPixels(source, source.rect, zero);
		}
		
		public function scrollBy(x:Number, y:Number):void {
			lock();
			
			//dx = (dx + x) % w;
			//if (dx < 0) dx = w - dx;
			//copyPixels(source, new Rectangle(dx, 0, w, h), zero);
			//copyPixels(source, new Rectangle(0, 0, dx, h), new Point(w - dx, 0));
			
			x = Math.round(x);
			y = Math.round(y);

			if (x > 0) {
				copyPixels(source, new Rectangle(x, 0, width, height), zero);
				copyPixels(source, new Rectangle(0, 0, x, height), new Point(width-x, 0));
				source.copyPixels(this, rect, zero);
			} else if (x < 0) {
				x = Math.abs(x);
				copyPixels(source, new Rectangle(width-x, 0, x, height), zero);
				copyPixels(source, new Rectangle(0, 0, width-x, height), new Point(x, 0));
				source.copyPixels(this, rect, zero);
			}

			//dy = (dy + y) % h;
			//if (dy < 0) dy = h - dy;
			//copyPixels(source, new Rectangle(0, dy, w, h), zero);
			//copyPixels(source, new Rectangle(0, 0, w, dy), new Point(0, h-dy));
			
			if (y > 0) {
				copyPixels(source, new Rectangle(0, y, width, height), zero);
				copyPixels(source, new Rectangle(0, 0, width, y), new Point(0, height-y));
				source.copyPixels(this, rect, zero);
			} else if (y < 0) {
				y = Math.abs(y);
				copyPixels(source, new Rectangle(0, height-y, width, y), zero);
				copyPixels(source, new Rectangle(0, 0, width, height-y), new Point(0, y));
				source.copyPixels(this, rect, zero);
			}
			
			unlock();
			
		}
	}
}