我在绘制画布时遇到了问题。没有错误,但是仍然没有绘制图像。请查看代码块,看看是否能发现我无法发现的问题:
function loadPacman(posX, posY) {
this.posX = posX;
this.posY = posY;
pacman = new Image();
pacman.src="http://www.frogbug.se/pacman/img/naziman.png";
pacman.addEventListener("load", function(){
canvas.drawImage(pacman, this.posX, this.posY)
}, false);
}
function loadGhost(posX, posY) {
this.posX = posX;
this.posY = posY;
ghost = new Image();
ghost.src="http://www.frogbug.se/pacman/img/ghost.png";
ghost.addEventListener("load", function(){
canvas.drawImage(ghost, this.posX, this.posY)
}, false);
}
这是在页面加载时启动的函数:
function onLoad() {
var xy = document.getElementById('canvas');
canvas = xy.getContext('2d');
//calculate the x and y for canvas
x = xy.width;
y = xy.height;
//divide the width and length of the canvas to get small cubes
//which is 40x40
xtile = Math.floor(x/40);
ytile = Math.floor(y/40);
//draw lines around the canvas
canvas.strokeRect(0, 0, x, y);
//the array for the map
var map = getMapArray();
//draw the map
drawMap(map);
//fillCanvas("0010", 0, 40, 40, 40);
//load the ghost and pacman
loadPacman(0, 0);
loadGhost((xtile*40)-40, (ytile*40)-40);
}
提前致谢!您可以在此处查看完整源代码等内容: http://www.picturds.com/pacman_serious/
this
的工作原理方面遇到一些问题。快速阅读一下:http://www.quirksmode.org/js/this.html - nikc.org