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Transition

Transition是什么?

它是一个基于贝塞尔曲线的动效插件。
它提供常用的缓动曲线。
支持自定义缓动曲线。

动画是如何产生的?

获取一帧动画数据
根据动画数据渲染图像
重复...

我们可以使用三组数据去描述一段动画（动画起始状态、动画结束状态、缓动曲线），根据这三组数据我们可以计算出动画过程中每一帧动画的状态。这就是Transition所提供的功能，根据每一帧动画的状态，我们不断的进行重绘，动画就产生了。

npm安装

$ npm install @jiaminghi/transition

使用

import { transition, injectNewCurve } from '@jiaminghi/transition'

// do something

快速体验

<!--资源位于个人服务器仅供体验和测试，请勿在生产环境使用-->
<!--调试版-->
<script src="http://lib.jiaminghi.com/transition/transition.map.js"></script>
<!--压缩版-->
<script src="http://lib.jiaminghi.com/transition/transition.min.js"></script>
<script>
  const { transition, injectNewCurve } = window.transition
  // do something
</script>

详细文档及示例请移步HomePage.

注解
示例
扩展新曲线
缓动曲线表

注解

/**
 * @description 根据动画起止状态及缓动曲线获取若干帧动画状态数据
 * @param {String|Array} tBC               缓动曲线名称或曲线数据
 * @param {Number|Arrya|Object} startState 动画起始状态
 * @param {Number|Arrya|Object} endState   动画结束状态
 * @param {Number} frameNum                动画帧数
 * @param {Boolean} deep                   是否启用递归模式
 * @return {Array} 每一帧的动画数据
 */
function transition (tBC, startState = null, endState = null, frameNum = 30, deep = false) {  // ...
}

示例

Transition 支持三种数据类型以描述动画状态.

Number
Array
Object
Recursive

Number

import transition from '@jiaminghi/transition'

const beginState = 0
const endState = 100

const animationState = transition('linear', beginState, endState, 10)

/**
 * animationState = [
 *   0, 11.03429355281208, 22.126200274348417, 33.259259259259245, 44.41700960219478,
 *   55.58299039780521, 66.74074074074073, 77.87379972565157, 88.96570644718793, 100
 * ]
 * /

Array

import transition from '@jiaminghi/transition'

const beginState = [10, 20, 30]
const endState = [100, 200, 300]

const animationState = transition('linear', beginState, endState, 10)

/**
 * animationState = [
 *   [10, 20, 30],
 *   [32.415625, 64.83125, 97.24687499999999],
 *   [55, 110, 165],
 *   [77.58437500000001, 155.16875000000002, 232.753125],
 *   [100, 200, 300]
 * ]
 * /

Object

import transition from '@jiaminghi/transition'

const objectBeginState = { x: 10, y: 10, r: 5}
const objectEndState = { x: 100, y: 10, r: 5}

const animationState = transition('linear', objectBeginState, objectEndState, 5)

/**
 * animationState = [
 *   {x: 10, y: 10, r: 5},
 *   {x: 32.415625, y: 10, r: 5},
 *   {x: 55, y: 10, r: 5},
 *   {x: 77.58437500000001, y: 10, r: 5},
 *   {x: 100, y: 10, r: 5}
 * ]
 * /

Recursive

启用递归模式以计算Array或Object中的深层数据.

import transition from '@jiaminghi/transition'

const beginState = {
  points: [ [10, 30], [20, 80] ],
  origin: { x: 10, y: 20 },
  radius: 3
}

const endState = {
  points: [ [100, 230], [120, 10] ],
  origin: { x: 100, y: 200 },
  radius: 9
}

const animationState = transition('linear', beginState, endState, 3, true)

/**
 * animationState = [
 *   {
 *     origin: { x: 10, y: 20 },
 *     points: [ [10, 30], [20, 80] ],
 *     radius: 3
 *   },
 *   {
 *     origin: { x: 55, y: 110 },
 *     points: [ [55, 130], [70, 45] ],
 *     radius: 6
 *   },
 *   {
 *     origin: { x: 100, y: 200 },
 *     points: [ [100, 230], [120, 10] ],
 *     radius: 9
 *   }
 * ]
 * /

Notice

非数值的属性或元素不参与计算过程.
起始状态与结束状态的数据类型（包括属性及元素的数量）必须保持一致.

扩展新曲线

如果你想扩展新的缓动曲线，你可以使用Transition提供的injectNewCurve方法去扩展。

import { injectNewCurve } from '@jiaminghi/transition'

const curveName = 'linear'

// 可以使用绘制工具获得
const bezierCurve = [[[0, 1]],[[1, 0]]]

injectNewCurve(curveName, bezierCurve)