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https://github.com/alloyteam/curvejs
Made curve a dancer in HTML5 canvas - 魔幻线条
https://github.com/alloyteam/curvejs
animation bezier canvas curve curvejs dance dancer
Last synced: about 18 hours ago
JSON representation
Made curve a dancer in HTML5 canvas - 魔幻线条
- Host: GitHub
- URL: https://github.com/alloyteam/curvejs
- Owner: AlloyTeam
- Created: 2017-04-17T01:24:18.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2019-03-22T07:31:17.000Z (almost 6 years ago)
- Last Synced: 2024-12-22T03:03:29.925Z (about 18 hours ago)
- Topics: animation, bezier, canvas, curve, curvejs, dance, dancer
- Language: JavaScript
- Homepage: https://alloyteam.github.io/curvejs/
- Size: 568 KB
- Stars: 1,306
- Watchers: 49
- Forks: 132
- Open Issues: 0
-
Metadata Files:
- Readme: README-CN.md
Awesome Lists containing this project
README
## 腾讯AlloyTeam正式发布Web魔幻线条 - curvejs
[curvejs](https://github.com/AlloyTeam/curvejs) 中文读["克js"]，是腾讯AlloyTeam打造的一款魔幻线条框架，让线条成为一名优秀的舞者，让线条们成为优秀的舞团，HTML5 Canvas就是舞台。
官网：[https://alloyteam.github.io/curvejs/](https://alloyteam.github.io/curvejs/)
你还记得window经典的屏幕保护程序《变幻线》吗？
其原理就是使用 Perlin-Noise + Particle System + Bézier Curve + Color Transition 制作而成。
使用curvejs实现类似变幻线功能只需要几行代码：
```js
const { Stage, Curve, motion } = curvejs
let stage = new Stage(document.getElementById('myCanvas'))
stage.add(new Curve({
color: '#00FF00',
data: {value: 0, step: 0.008, width: 600, height: 400},
motion: motion.noise
}))
function tick(){
stage.update()
requestAnimationFrame(tick)
}
tick()
```
[【体验地址】](https://alloyteam.github.io/curvejs/pg/rd.html?type=noise)
当然，curvejs的能力不仅仅是变换线，这完全取决于你的想象力。比如：
* [Loading](https://alloyteam.github.io/curvejs/example/loading/)
* [Rope](https://alloyteam.github.io/curvejs/example/rope/)
* [Siri-Wave](https://alloyteam.github.io/curvejs/example/siri-wave/)
* [Water](https://alloyteam.github.io/curvejs/example/water/)
* [Sprout](https://alloyteam.github.io/curvejs/example/sprout/)
* [Scale-To](https://alloyteam.github.io/curvejs/pg/rd.html?type=scale)
* [Points-To](https://alloyteam.github.io/curvejs/pg/rd.html?type=points-to)
* [Rotate](https://alloyteam.github.io/curvejs/pg/rd.html?type=rotate)
* [Word](https://alloyteam.github.io/curvejs/pg/rd.html?type=word)
* [Perlin-Noise](https://alloyteam.github.io/curvejs/pg/rd.html?type=noise)
* [Simple](https://alloyteam.github.io/curvejs/pg/rd.html?type=simple)
* [Simple-ES5](https://alloyteam.github.io/curvejs/pg/rd.html?type=simple-es5)
* [Lerp Color](https://alloyteam.github.io/curvejs/pg/rd.html?type=color)
* [Curves](https://alloyteam.github.io/curvejs/pg/rd.html?type=curves)
* [Line](https://alloyteam.github.io/curvejs/pg/rd.html?type=line)
* [Close](https://alloyteam.github.io/curvejs/pg/rd.html?type=close)
## 使用指南
```bash
$ npm install curvejs
```
```javascript
import curvejs from 'curvejs'
```
也可以直接插入script到你的HTML页面:
```html
```
开始跳舞:
```js
var Stage = curvejs.Stage,
Curve = curvejs.Curve,
canvas = document.getElementById('myCanvas'),
stage = new Stage(canvas),
rd = function() {
return -2 + Math.random() * 2
}
var curve = new Curve({
color: '#00FF00',
points: [277, 327, 230, 314, 236, 326, 257, 326],
data: [rd(), rd(), rd(), rd(), rd(), rd(), rd(), rd()],
motion: function motion(points, data) {
points.forEach(function (item, index) {
points[index] += data[index]
})
}
})
stage.add(curve)
function tick(){
stage.update()
requestAnimationFrame(tick)
}
tick()
```
上面的points代表了三次贝塞尔曲线的4个点。motion代表运动方式，motion可以拿到points和data。motion里函数的this指向Curve是实例curve。
## 使用内置motion
```js
var curve = new Curve({
points: [277, 327, 230, 314, 236, 326, 257, 326],
data: {angle: 0, r:5 ,step:Math.PI / 50 },
motion: curvejs.motion.dance
})
```
## 基本原理
* 每次创建Curve 可以传入八个数字，其实就代表上面的4个点的坐标
* motion里可以拿到 points 进行自定义变幻
* 幻影不需要开发者考虑，curvejs会自动生成幻影
这里需要特别强调，curvejs的幻影不是利用canvas的黑色底，然后fillRect填充半透而产生，而是Particle System。所以curvejs制作出的效果不用一定是黑色背景，而且canvas也可以是透明，这就大大增加了适用场景。
## 提交你的motion
在 [ motion 目录](https://github.com/AlloyTeam/curvejs/tree/master/src/motion), 有许多内置的motion提供给开发者使用，但是你也可以提交你的motion到这个项目，我会第一时间review并合入主干。
基本motion格式规则:
```js
/**
* motion description.
*
* @param {points}
* @param {data}
* data rule example:
* [1, 0.2, -3, 0.7, 0.5, 0.3, -1, 1]
*/
export default function (points, data) {
//你的motion逻辑
}
```
## curvejs相关
* 官网：[https://alloyteam.github.io/curvejs/](https://alloyteam.github.io/curvejs/)
* Github: [https://github.com/AlloyTeam/curvejs](https://github.com/AlloyTeam/curvejs)
* 更加方便的交流关于curvejs的一切可以加入QQ的curvejs交流群(179181560)