在变量square中，我将其定义为50x50大小，然后给它一个随机定位。它也有随机颜色。不过，它每次都不会是相同大小的方块。我该怎么做才能解决这个问题？
<html>
<head>
</head>
<body>
<p> Click Start Game to play </p>
<div id="start">Start Game</div>
<script>
function component(width, height, color, x, y, type) {
this.type = type;
if (type == "image"){
this.image = new Image();
this.image.src = color;
}
this.score = 0;
this.width = width;
this.height = height;
this.speedX = 0;
this.speedY = 0;
this.x = x;
this.y = y;
this.gravity = 0;
this.gravitySpeed = 0;
this.color=color;
this.update = function() {
random = Math.floor((Math.random()*100) + 1);
random2 = Math.floor((Math.random()*100) + 1);
function getRandomColor() {
var letters = '0123456789ABCDEF';
var color = '#';
for (var i = 0; i < 6; i++ ) {
color += letters[Math.floor(Math.random() * 16)];
}
return color;
}
randcolor=getRandomColor();
ctx = myGameArea.context;
if (this.type == "image"){
ctx.drawImage(this.image, random, random2, random,random2);
} else {
ctx.fillStyle = randcolor;
ctx.fillRect(random, random2, random, random2);
}
this.x=random;
this.y=random2;
this.width=random;
this.height=random2;
this.color=randcolor;
}
}
function startGame() {
random = Math.floor((Math.random()*100) + 1);
random2 = Math.floor((Math.random()*100) + 1);
square = new component(50, 50, "green", random, random2);
myGameArea.start();
return square
}
var myGameArea = {
canvas : document.createElement("canvas"),
start : function() {
this.canvas.width = 450;
this.canvas.height = 270;
this.context = this.canvas.getContext("2d");
document.body.insertBefore(this.canvas, document.body.childNodes[0]);
this.interval = setInterval(updateGameArea, 1000);
},
clear : function() {
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
}
}
function updateGameArea() {
myGameArea.clear();
square.update();
}
function userPiece() {
userSquare = new component(50,50, "green", 200,50);
return userSquare
}
document.getElementById("start").addEventListener('click', startGame);
</script>
</body>
</html>
答案 0 :(得分：1)
您正在绘制具有随机尺寸的矩形。你需要像这样ctx.fillRect(random, random2, 50, 50);
<html>
<head>
</head>
<body>
<p> Click Start Game to play </p>
<div id="start">Start Game</div>
<script>
function component(width, height, color, x, y, type) {
this.type = type;
if (type == "image"){
this.image = new Image();
this.image.src = color;
}
this.score = 0;
this.width = width;
this.height = height;
this.speedX = 0;
this.speedY = 0;
this.x = x;
this.y = y;
this.gravity = 0;
this.gravitySpeed = 0;
this.color=color;
this.update = function() {
random = Math.floor((Math.random()*100) + 1);
random2 = Math.floor((Math.random()*100) + 1);
function getRandomColor() {
var letters = '0123456789ABCDEF';
var color = '#';
for (var i = 0; i < 6; i++ ) {
color += letters[Math.floor(Math.random() * 16)];
}
return color;
}
randcolor=getRandomColor();
ctx = myGameArea.context;
if (this.type == "image"){
ctx.drawImage(this.image, random, random2, random,random2);
} else {
ctx.fillStyle = randcolor;
ctx.fillRect(random, random2, 50, 50);
}
this.x=random;
this.y=random2;
this.width=50;
this.height=50;
this.color=randcolor;
}
}
function startGame() {
random = Math.floor((Math.random()*100) + 1);
random2 = Math.floor((Math.random()*100) + 1);
square = new component(50, 50, "green", random, random2);
myGameArea.start();
return square
}
var myGameArea = {
canvas : document.createElement("canvas"),
start : function() {
this.canvas.width = 450;
this.canvas.height = 270;
this.context = this.canvas.getContext("2d");
document.body.insertBefore(this.canvas, document.body.childNodes[0]);
this.interval = setInterval(updateGameArea, 1000);
},
clear : function() {
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
}
}
function updateGameArea() {
myGameArea.clear();
square.update();
}
function userPiece() {
userSquare = new component(50,50, "green", 200,50);
return userSquare
}
document.getElementById("start").addEventListener('click', startGame);
</script>
</body>
</html>