canvas实现抽奖转盘代码
时间: 2023-09-24 14:09:35 浏览: 210
以下是一个简单的使用 Canvas 实现抽奖转盘的代码示例:
HTML:
```html
<canvas id="canvas" width="400" height="400"></canvas>
```
JavaScript:
```javascript
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
// 转盘配置
const options = ['奖品1', '奖品2', '奖品3', '奖品4', '奖品5', '奖品6'];
const colors = ['#FF0000', '#FF7F00', '#FFFF00', '#00FF00', '#00FFFF', '#0000FF'];
const sliceCo
相关问题
html转盘游戏代码,html5 canvas大转盘抽奖提示代码
以下是一个简单的 HTML5 Canvas 转盘游戏代码示例:
```html
<!DOCTYPE html>
<html>
<head>
<title>转盘游戏</title>
<meta charset="utf-8">
<style type="text/css">
canvas {
border: 1px solid #000;
}
</style>
</head>
<body>
<canvas id="canvas" width="400" height="400"></canvas>
<button id="btn" onClick="spin()">开始抽奖</button>
<script type="text/javascript">
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var colors = ["#FFA07A", "#FFD700", "#FFA500", "#FF4500", "#FF69B4", "#DA70D6", "#7B68EE", "#4169E1", "#00BFFF", "#00FF00", "#FFFF00", "#FF1493"];
var slices = colors.length;
var sliceDeg = 360/slices;
var deg = 0;
var speed = 0;
var slowDownRand = 0;
var ctxW = canvas.width;
var ctxH = canvas.height;
var centerX = ctxW/2;
var centerY = ctxH/2;
var spinButton = document.getElementById("btn");
function deg2rad(deg) {
return deg * Math.PI/180;
}
function drawSlice(deg, color) {
ctx.beginPath();
ctx.fillStyle = color;
ctx.moveTo(centerX, centerY);
ctx.arc(centerX, centerY, 150, deg2rad(deg), deg2rad(deg+sliceDeg));
ctx.lineTo(centerX, centerY);
ctx.fill();
}
function drawText(deg, text) {
ctx.save();
ctx.translate(centerX, centerY);
ctx.rotate(deg2rad(deg));
ctx.textAlign = "center";
ctx.fillStyle = "#fff";
ctx.font = "bold 20px sans-serif";
ctx.fillText(text, 100, 0);
ctx.restore();
}
function draw() {
for (var i = 0; i < slices; i++) {
drawSlice(deg, colors[i]);
drawText(deg+sliceDeg/2, "奖项" + (i+1));
deg += sliceDeg;
}
}
function spin() {
spinButton.disabled = true;
speed = 30;
slowDownRand = Math.floor(Math.random() * 10) + 1;
rotateWheel();
}
function rotateWheel() {
ctx.clearRect(0, 0, ctxW, ctxH);
draw();
if (speed > 0) {
speed -= 1;
deg += speed;
}
if (speed == 0) {
var landed = Math.floor(((360 - deg - 90) % 360) / sliceDeg);
//提示中奖信息
alert("恭喜您获得:" + (landed+1) + "号奖项!");
spinButton.disabled = false;
}
if (speed < 0) {
speed += 1;
deg += speed;
}
if (slowDownRand == 0) {
speed = 0;
}
slowDownRand--;
requestAnimationFrame(rotateWheel);
}
draw();
</script>
</body>
</html>
```
这个示例使用 Canvas 绘制了一个 12 个奖项的转盘,并且通过 JavaScript 控制转盘的旋转和停止。当用户点击“开始抽奖”按钮时,转盘开始旋转,最终停在一个随机的奖项上,并弹出一个提示框显示中奖信息。
注:这只是一个简单的示例,实际的转盘游戏可能需要更复杂的逻辑和 UI 设计。
canvas转盘抽奖
canvas转盘抽奖是一种通过使用HTML5的canvas标签和相应的JavaScript代码实现的抽奖功能。它的功能需求包括美观的转盘效果、显示后台读取的奖品图片和名字、转动动画完成后的提示以及数据库中操作奖品算法并提供最终效果展示。为了实现更智能化的转动效果,可以使用jq插件awardRotate来辅助实现转动效果的流畅展示。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* [canvas写抽奖大转盘图片和文字](https://blog.csdn.net/w001yy/article/details/95968749)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
- *2* *3* [利用canvas实现抽奖转盘](https://blog.csdn.net/Odl_Dragon/article/details/110426121)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
[ .reference_list ]
阅读全文