我尝试使用HTML Canvas制作游戏,但遇到了问题。
当我使用'window.onload'调用我的“init”函数时,程序不会加载任何图像。Canvas已经创建,但图像不存在,当我在chrome控制台中提交我的函数时,图像出现了...所以我想在加载图像完成后执行该函数。
谢谢帮助!
这里是瓦片地图:
var requestAnimId;
// Initialisation
function init() {
var tilemapCtx = new Canvas('tilemap', 800, 600, 1);
var tilemap = new Tilemap("sand", tilemapCtx);
requestAnimId = window.requestAnimationFrame(update);
}
// Boucle de rafraîchissement
function update() {
requestAnimId = window.requestAnimationFrame(update);
}
window.onload = init;
这里是瓦片地图:
var Tilemap = function(map, canvas) {
for (var y = 0; y < 10; y++) {
for (var x = 0; x < 10; x++) {
// Création de la tile
this.image = new Image();
// Définition de l'image
switch(tilemaps[map][y][x]) {
case " ":
this.image.src = "assets/sand.png";
break;
case "#":
this.image.src = "assets/wall.png";
break;
}
// Affichage de l'image
//canvas.drawImage(this.image, tileX, tileY, tilesetWidth, tilesetHeight, x, y, 32, 32);
canvas.drawImage(this.image, 32, 32);
}
}
和画布:
var Canvas = function(name, width, height, zIndex) {
this.canvas = window.document.createElement("canvas");
this.canvas.id = name;
this.canvas.style.position = "absolute";
this.canvas.width = width;
this.canvas.height = height;
this.canvas.style.zIndex = zIndex;
document.body.appendChild(this.canvas);
return this.canvas.getContext('2d');
}