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033.刮刮卡.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="./assets/global.css">
<style>
* {
margin: 0;
padding: 0;
}
#mask,
#result {
width: 480px;
height: 720px;
user-select: none;
}
#mask {
position: absolute;
left: 0;
top: 0;
}
</style>
</head>
<body>
<canvas id="result"></canvas>
<canvas id="mask"></canvas>
<script>
/** @type {HTMLCanvasElement} */
var result = document.querySelector('#result')
/** @type {CanvasRenderingContext2D} */
var resultContext = result.getContext('2d')
/** @type {HTMLCanvasElement} */
var mask = document.querySelector('#mask')
/** @type {CanvasRenderingContext2D} */
var maskContext = mask.getContext('2d')
/** 是否允许刮开 */
var isScratch = false;
var resultImage = new Image();
var maskImage = new Image();
var lastX = 0;
var lastY = 0
mask.hidden = true;
resultImage.src = 'assets/scratchCard.jpg'
maskImage.src = 'assets/scratchCard.png'
resultImage.onload = function () {
result.width = resultImage.width;
result.height = resultImage.height;
resultContext.drawImage(resultImage, 0, 0, result.width, result.height)
// TODO 随机卡号
// TODO 随机条码
// TODO 随机奖金
// TODO 随机纹理
}
maskImage.onload = function () {
mask.width = maskImage.width;
mask.height = maskImage.height;
maskContext.drawImage(maskImage, 0, 0, mask.width, mask.height)
mask.hidden = false;
}
mask.onmousedown = function (e) {
isScratch = true
var x = e.clientX - parseInt(mask.offsetLeft);
var y = e.clientY - parseInt(mask.offsetTop);
x = parseInt(x / mask.clientWidth * mask.width)
y = parseInt(y / mask.clientHeight * mask.height)
lastX = x;
lastY = y;
}
mask.onmouseup = function () {
isScratch = false;
}
mask.onmousemove = function (e) {
if (isScratch) {
var x = e.clientX - parseInt(mask.offsetLeft);
var y = e.clientY - parseInt(mask.offsetTop);
x = parseInt(x / mask.clientWidth * mask.width)
y = parseInt(y / mask.clientHeight * mask.height)
maskContext.lineWidth = 20;
maskContext.beginPath();
maskContext.moveTo(lastX, lastY);
maskContext.lineTo(x, y)
maskContext.globalCompositeOperation = "destination-out";
maskContext.closePath();
maskContext.stroke()
lastX = x;
lastY = y;
}
}
</script>
</body>
</html>