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index.html
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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>trex</title>
<style>
#canvasContainer {
margin-top: 20px;
}
</style>
</head>
<body>
<div id="canvasContainer"></div>
<script src="./js/util.js"></script>
<script src="./js/getImage.js"></script>
<script src="./js/horizon.js"></script>
<script src="./js/sprite.js"></script>
<script src="./js/text.js"></script>
<script src="./js/obstacle.js"></script>
<script src="./js/cloud.js"></script>
<script>
(function () {
// 默认宽高
var GAME_WIDTH = 600;
var GAME_HEIGHT = 150;
// 画布准备工作
var cvsContainer = document.querySelector('#canvasContainer');
var cvs = document.createElement('canvas');
cvs.width = GAME_WIDTH;
cvs.height = GAME_HEIGHT;
cvsContainer.appendChild(cvs);
var ctx = cvs.getContext('2d');
var isGameOver = false;
// 游戏主函数
function main(role, imgs) {
isGameOver = false;
requestAnimationFrame(function () {
// 先清除画布
ctx.clearRect(0, 0, cvs.width, cvs.height);
// 碰撞检测
var trexLeft = role.trex.x,
trexRight = trexLeft + role.trex.width,
trexBottom = role.trex.y + role.trex.height;
var tempObstacle, tempObstacleLeft, tempObstacleRight, tempObstacleTop;
for (var i = 0; i < role.obstacle.length; i++) {
tempObstacle = role.obstacle[i];
tempObstacleLeft = tempObstacle.x;
tempObstacleRight = tempObstacleLeft + tempObstacle.width;
tempObstacleTop = tempObstacle.y;
// 恐龙右侧大于障碍物左侧，并且障碍物右侧大于恐龙左侧，说明纵坐标有交集；
// 如果在此基础上，横坐标也有交集说明发生碰撞
// 为了更好的游戏体验，碰撞做了轻微容错处理。
if (trexRight - tempObstacleLeft > 6 && tempObstacleRight - trexLeft > 6
&& trexBottom - tempObstacleTop > 6) {
ctx.drawImage(imgs.text,
0, 13, imgs.text.width, 11,
(cvs.width - imgs.text.width) / 2, (cvs.height - imgs.text.height) / 2,
imgs.text.width, imgs.text.height);
role.trex.unbind();
role.trex.index = 4;
isGameOver = true;
}
}
// 绘制游戏画面
for (var obj in role) {
// 如果是数组，则遍历
if (({}).toString.call(role[obj]) === '[object Array]') {
role[obj].forEach(function (val) {
val.draw();
val.update();
});
}else {
role[obj].draw();
role[obj].update();
}
}
// 游戏未结束，则继续
if (!isGameOver) {
main(role, imgs);
}
});
}
// 开始游戏
function run(imgs) {
// 游戏所需的角色
var role = {
horizon : [],
obstacle : [],
cloud: [],
text: null,
trex: null
};
// 地平线
role.horizon.push(new Horizon(ctx, imgs.horizon));
role.horizon.push(new Horizon(ctx, imgs.horizon, imgs.horizon.width));
// 云
role.cloud.push(new Cloud(ctx, imgs.cloud));
role.cloud.push(new Cloud(ctx, imgs.cloud));
role.cloud.push(new Cloud(ctx, imgs.cloud));
// 文本
role.text = new Text(ctx, Date.now(), cvs.width, 0);
// 霸王龙，0到3帧图像是跑动，4和5是碰撞
role.trex = new Sprite(ctx, imgs.trex, 3, imgs.trex.width / 6, imgs.trex.height);
// 障碍物
var obstacleWidth = imgs.obstacle_large.width / 6;
var obstacleHeight = imgs.obstacle_large.height;
role.obstacle.push(new Obstacle(ctx, imgs.obstacle_large, 5, obstacleWidth, obstacleHeight));
role.obstacle.push(new Obstacle(ctx, imgs.obstacle_large, 5, obstacleWidth, obstacleHeight));
main(role, imgs);
}
// 游戏所需的图片资源地址
var imgPaths = {
game_icon : './imgs/error_offline.png',
horizon : './imgs/horizon.png',
trex : './imgs/trex.png',
cloud : './imgs/cloud.png',
obstacle_large : './imgs/obstacle_large_sprite.png',
obstacle_small : './imgs/obstacle_small_sprite.png',
restart : './imgs/restart.png',
text : './imgs/text_sprite.png'
};
// 获取图片资源，创建实例，绘制游戏画面
getImage(imgPaths, function (imgs) {
run(imgs);
// 游戏结束时，空格键重新开始游戏
document.addEventListener('keyup', function (e) {
if (isGameOver && e.keyCode == 32) {
run(imgs);
}
});
});
}());
</script>
</body>
</html>