跨平台图像渲染

import webdraw.*;


class Demo1 extends App {
	
	private var canvas: Canvas;
	private var img: Image;
	private var x = 999;
	private var p = 0.0;
	
	
	public function new() {
		super();

		canvas = new Canvas(document.width, document.height);
		document.appendChild(canvas);

		img = new Image();			// load image
		img.onload = function() {	// bind render event
			onRender = handleRender;
		};
		img.onerror = function() {	// load fail
			trace('error');
		};
		img.src = 'poker.png';
	}

	private function handleRender() {
		if (x > canvas.width) {
			x = 0;
			p = Math.random() * canvas.height / 2;
		}
		
		// f(x)
		var RAD = Math.PI / 180;
		var y = p + 112 * Math.sin(x * 2 * RAD);
		
		// draw image
		//canvas.clear();
		canvas.drawImage(img, 0, 0, img.width, img.height, x, y);
		x += 3;
	}
	
	// HaXe entry
	static function main() {
		new Demo1();
	}
}