js中绘制一个运动的圆弧const DeltaAngle = 360 / 100; // 圆弧进度条每帧增加的角度 const Radius = 100; // 圆弧进度条的半径 const Fps = 60; // 圆弧进度条的动画帧率 let i = 0; // 圆弧进度条的进度,初始为0
时间: 2023-03-31 10:02:58 浏览: 75
可以使用 canvas 绘制一个运动的圆弧,代码如下:
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
const x = canvas.width / 2;
const y = canvas.height / 2;
function draw() {
ctx.clearRect(, , canvas.width, canvas.height);
ctx.beginPath();
ctx.arc(x, y, Radius, , i * DeltaAngle * Math.PI / 180);
ctx.strokeStyle = '#00ff00';
ctx.lineWidth = 10;
ctx.stroke();
i++;
if (i > 100) {
i = ;
}
}
setInterval(draw, 100 / Fps); // 每秒执行60次,即60帧动画
相关问题
js中绘制一个运动的圆弧
你可以使用 canvas 绘制一个运动的圆弧,具体实现可以参考以下代码:
```javascript
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
let startAngle = ;
let endAngle = ;
let radius = 50;
let centerX = canvas.width / 2;
let centerY = canvas.height / 2;
function draw() {
ctx.clearRect(, , canvas.width, canvas.height);
ctx.beginPath();
ctx.arc(centerX, centerY, radius, startAngle, endAngle);
ctx.stroke();
endAngle += Math.PI / 180;
requestAnimationFrame(draw);
}
requestAnimationFrame(draw);
```
这段代码会在 canvas 中绘制一个半径为 50 的圆弧,并且每次调用 `requestAnimationFrame` 函数时,圆弧的结束角度会增加 1 度,从而实现圆弧的运动效果。
const val STATE_OPENED = 1 //打开状态 const val STATE_CLOSED = 2 //关闭状态 const val STATE_DRAG = 3 // 拖拽中 const val STATE_FLING = 4 // 飞一会儿 转换成java
public static final int STATE_OPENED = 1; //打开状态
public static final int STATE_CLOSED = 2; //关闭状态
public static final int STATE_DRAG = 3; // 拖拽中
public static final int STATE_FLING = 4; // 飞一会儿