【开源】微信小程序、小游戏以及 Web 通用 Canvas 渲染引擎 - Cax

└── cax
    ├── cax.js
    ├── cax.json  
    ├── cax.wxml  
    ├── cax.wxss
    └── index.js

{
  "usingComponents": {
    "cax":"../cax/cax"
  }
}

<cax id="myCanvas"></cax>

import cax from '../cax/index'

Page({
  onLoad: function () {
    //比 web 里使用 cax 多传递 this，this 代表 Page 或 Component 的实例
    const stage = new cax.Stage(200, 200, 'myCanvas', this)
    const rect = new cax.Rect(100, 100, {
      fillStyle: 'black'
    })
    
    rect.originX = 50
    rect.originY = 50
    rect.x = 100
    rect.y = 100
    rect.rotation = 30

    rect.on('tap', () => {
      console.log('tap')
    })

    stage.add(rect)
    stage.update()
  }
})

rect.on('touchstart', () => {
  console.log('touchstart')
})

rect.on('touchmove', () => {
  console.log('touchmove')
})

rect.on('touchend', () => {
  console.log('touchend')
})

const stage = new cax.Stage()

npm i cax

import cax from 'cax'

const stage = new cax.Stage(200, 200, '#renderTo')
const rect = new cax.Rect(100, 100, {
  fillStyle: 'black'
})

stage.add(rect)
stage.update()

const group = new cax.Group()
const rect = new cax.Rect(100, 100 {
  fillStyle: 'black'
})
group.add(rect)
stage.add(group)
stage.update()

const bitmap = new cax.Bitmap(img)
stage.add(bitmap)
stage.update()

const bitmap = new cax.Bitmap('./wepay.png', ()=>{
  stage.update()
})
stage.add(bitmap)

bitmap.rect = [0, 0, 170, 140]
bitmap.x = 200

const sprite = new cax.Sprite({
    framerate: 7,
    imgs: ['./mario-sheet.png'],
    frames: [
        // x, y, width, height, originX, originY ,imageIndex
        [0, 0, 32, 32],
        [32 * 1, 0, 32, 32],
        [32 * 2, 0, 32, 32],
        [32 * 3, 0, 32, 32],
        [32 * 4, 0, 32, 32],
        [32 * 5, 0, 32, 32],
        [32 * 6, 0, 32, 32],
        [32 * 7, 0, 32, 32],
        [32 * 8, 0, 32, 32],
        [32 * 9, 0, 32, 32],
        [32 * 10, 0, 32, 32],
        [32 * 11, 0, 32, 32],
        [32 * 12, 0, 32, 32],
        [32 * 13, 0, 32, 32],
        [32 * 14, 0, 32, 32]
    ],
    animations: {
        walk: {
            frames: [0, 1]
        },
        happy: {
            frames: [5, 6, 7, 8, 9]
        },
        win: {
            frames: [12]
        }
    },
    playOnce: false,
    currentAnimation: "walk",
    animationEnd: function () {

    }
});

const text = new cax.Text('Hello World', {
  font: '20px Arial',
  color: '#ff7700',
  baseline: 'top'
})

const graphics = new cax.Graphics()
graphics
    .beginPath()
    .arc(0, 0, 10, 0, Math.PI * 2)
    .closePath()
    .fillStyle('#f4862c')
    .fill()
    .strokeStyle('black')
    .stroke()

graphics.x = 100
graphics.y = 200

stage.add(graphics)

const rect = new cax.Rect(200, 100, {
  fillStyle: 'black'
})

const circel = new cax.Circel(10)

const ellipse = new cax.Ellipse(10)

const button = new cax.Button({
  width: 100,
  height: 40,
  text: "Click Me!"
})

class Sector extends cax.Shape {
  constructor (r, from, to, option) {
    super()

    this.option = option || {}
    this.r = r
    this.from = from
    this.to = to
  }

  draw () {
    this.beginPath()
      .moveTo(0, 0)
      .arc(0, 0, this.r, this.from, this.to)
      .closePath()
      .fillStyle(this.option.fillStyle)
      .fill()
      .strokeStyle(this.option.strokeStyle)
      .lineWidth(this.option.lineWidth)
      .stroke()
  }
}

const sector = new Sector(10, 0, Math.PI/6, {
  fillStyle: 'red'
  lineWidth: 2
})
stage.add(sector)
stage.update()

class Button extends cax.Group {
  constructor (option) {
    super()
    this.width = option.width
    this.roundedRect = new  cax.RoundedRect(option.width, option.height, option.r)
    this.text = new cax.Text(option.text, {
      font: option.font,
      color: option.color
    })

    this.text.x = option.width / 2 - this.text.getWidth() / 2 * this.text.scaleX
    this.text.y = option.height / 2 - 10 + 5 * this.text.scaleY
    this.add(this.roundedRect, this.text)
  }
}

export default Button

const button = new cax.Button({
  width: 100,
  height: 40,
  text: "Click Me!"
})