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html5游戏中增加障碍的源代码-1

51自学网 http://www.wanshiok.com

 现在我们想为我们的游戏添加一些障碍。

 
在游戏区域添加一个新的组件。 使其为绿色,宽10像素,高200像素,并将其放在右边的300像素,向下放120像素。
 
还更新每个框架中的障碍物组件:

Example

var myGamePiece;
var myObstacle;

function startGame() {
    myGamePiece = new component(3030"red"10120);
    myObstacle = new component(10200"green"300120); 
    myGameArea.start();
}

function updateGameArea() {
    myGameArea.clear();
    myObstacle.update();
    
myGamePiece.newPos();
    myGamePiece.update();
}
 
完整源代码:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
canvas {
    border:1px solid #d3d3d3;
    background-color: #f1f1f1;
}
</style>

</head>
<body onload="startGame()">
<script>

var myGamePiece;
var myObstacle;

function startGame() {
    myGamePiece = new component(30, 30, "red", 10, 120);
    myObstacle  = new component(10, 200, "green", 300, 120);    
    myGameArea.start();
}

var myGameArea = {
    canvas : document.createElement("canvas"),
    start : function() {
        this.canvas.width = 480;
        this.canvas.height = 270;
        this.context = this.canvas.getContext("2d");
        document.body.insertBefore(this.canvas, document.body.childNodes[0]);
        this.interval = setInterval(updateGameArea, 20);
    },
    clear : function() {
        this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
    }
}

function component(width, height, color, x, y) {
    this.width = width;
    this.height = height;
    this.speedX = 0;
    this.speedY = 0;    
    this.x = x;
    this.y = y;    
    this.update = function() {
        ctx = myGameArea.context;
        ctx.fillStyle = color;
        ctx.fillRect(this.x, this.y, this.width, this.height);
    }
    this.newPos = function() {
        this.x += this.speedX;
        this.y += this.speedY;        
    }    
}

function updateGameArea() {
    myGameArea.clear();
    myObstacle.update();
    myGamePiece.newPos();    
    myGamePiece.update();
}

function moveup() {
    myGamePiece.speedY = -1; 
}

function movedown() {
    myGamePiece.speedY = 1; 
}

function moveleft() {
    myGamePiece.speedX = -1; 
}

function moveright() {
    myGamePiece.speedX = 1; 
}

function clearmove() {
    myGamePiece.speedX = 0; 
    myGamePiece.speedY = 0; 
}
</script>
<div style="text-align:center;width:480px;">
  <button onmousedown="moveup()" onmouseup="clearmove()" ontouchstart="moveup()">UP</button><br><br>
  <button onmousedown="moveleft()" onmouseup="clearmove()" ontouchstart="moveleft()">LEFT</button>
  <button onmousedown="moveright()" onmouseup="clearmove()" ontouchstart="moveright()">RIGHT</button><br><br>
  <button onmousedown="movedown()" onmouseup="clearmove()" ontouchstart="movedown()">DOWN</button>
</div>
<p>现在我们的游戏区有一个障碍,但当移动红色方块击中障碍时,看上去没有任何反应。.</p>
</body>
</html>
 
 

 
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