npm package: @svg-drawing/animation
Description: svg drawing library.
Author: Kazuto Kamei
Latest version: 5.0.1-beta.0

# `@svg-drawing/animation`

[![npm version](https://img.shields.io/npm/v/@svg-drawing/animation/latest.svg)](https://www.npmjs.com/package/@svg-drawing/animation) [![npm download](https://img.shields.io/npm/dm/@svg-drawing/animation.svg)](https://www.npmjs.com/package/@svg-drawing/animation)

## Install

### npm

```shell
yarn add @svg-drawing/animation
# or
# npm i @svg-drawing/animation
```

## How to use

Example code is [here](/examples/docs/pages/demo/animation.tsx)

```js
import { SvgDrawing } from '@svg-drawing/core'
import { SvgAnimation } from '@svg-drawing/animation'
// Render drawing area. omitted the description
const draw = new SvgDrawing(el)

// Render animation
// It is resized to fit the rendering area as well as the SvgDrawing area.
const anim = new SvgAnimation(animEl, {
  ms: 20
})

// Example drawing animation.
// Callback function to set SvgAnimation
// Since the Path Object before animation is passed as an argument, it is converted and returned.

const setupAnimation = () => {
  // Copy drawwing data.
  // You can also use `parseSVGElement` or `parseSVGString`.
  // anim.renderer.svg.parseSVGElement(document.getElementByID('targetSvg'))
  // draw.renderer.svg.parseSVGString('<svg width="100" height="100"><path fill="#f00" stroke="#00f"stroke-width="4" d="M 10 10 L 20 20 C 30 30 50 30 70 30 Z"></path></svg>')
  anim.svg.copy(draw.svg)

  // Sets the animation callback function. `fid` is number of frame index.
  // It repeat times number of total commands. You can change the number of repeats as an option.
  anim.setAnimation(
    (paths, fid) => {
      let dispNum = fid
      const update = []
      for (let i = 0; i < paths.length; i += 1) {
        if (count < paths[i].commands.length) {
          paths[i].commands = paths[i].commands.slice(0, dispNum)
          update.push(paths[i])
          break
        }
        dispNum -= paths[i].commands.length
        update.push(paths[i])
      }
      return update
    }

    // The default value for the option. It works the same without writing.
    // This option cannot be used before version 2. When setting the number of frames, you need to have a global variable used in the animation function
    {
      frames: anim.paths.reduce((l, p) => l + p.commands.length, 0), // The number of frames in the animation.
      repeatCount: 'indefinete' // Set repeatCount attribute  to animate element
      ms: 20 // Set seconds per frame
    }
  )
}


// Animation Start
const start = document.getElementById('start')
start.onclick = () => {
  // load draw data
  loadSvgAnimation()

  // Method to animate Svg with JavaScript
  anim.start()

  // Or use SVGAnimateElement.
  anim.renderer.el.replaceChild(anim.toElement(), anim.renderer.el.childNodes[0])
  console.log(anim.toElement()) // <svg height="100" version="1.1" width="100" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><path d="M 10 10 L 20 20 C 30 30 50 30 70 30 Z" fill="#f00" id="t0" stroke="#00f" stroke-linecap="round" stroke-linejoin="round" stroke-width="4"><animateattributeName="d" dur="240ms" keyTimes="0;0.25;0.5;0.75;1" repeatCount="indefinite" values="M 10 10 L 20 20 C 30 30 50 30 70 30 Z;M 10 10;M 10 10;M 10 10 L 20 20;M 10 10 L 20 20 C 30 30 50 30 70 30" /></path></svg>
}

// Animation Stop
const stop = document.getElementById('stop')
stop.onclick = () => {
  // Stop Animation.
  anim.stop()
  // Restore Svg before animation.
  anim.restore()
}

// Download animtaion svg.
const download = document.getElementById('download')
download.onclick = () => {
  setupAnimation()
  anim.download()
}
```

```javascript
const anim = new SvgAnimation(el)

// Property `ms` can be changed to set seconds per frame. `ms` is mili seconds.
// Can be changed during animation
anim.ms = 50

// Animation Start
anim.start()
// Animation Stop
anim.stop()
// Return to Svg before animation
anim.restore()

/**
 * Only version 3 or later is supported
 */
// Creata animation svg element.
anim.toElement()
// Download animation svg element.
anim.download()
```

#### Animation example

First load any SVG into SvgAnimation.

```js
const anim = new SvgAnimation(el, { ms: 200 })

anim.renderer.svg.parseSVGString(
  `<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="802" height="202"><path stroke-width="5" fill="none" stroke="black" stroke-linecap="round" stroke-linejoin="round" d="M 79.390625 66.94140625 C 79.16 66.72 79.01 66.4 78.22 65.85 C 77.43 65.3 76.4 64.58 75.46 64.18 C 74.52 63.78 74.48 64.2 73.52 63.84 C 72.56 63.48 71.8 62.89 70.67 62.39 C 69.54 61.89 69.92 61.7 67.89 61.33 C 65.86 60.96 62.74 60.77 60.51 60.54 C 58.28 60.31 58.52 60.27 56.76 60.2 C 55 60.13 53.46 60.2 51.71 60.2 C 49.96 60.2 50.24 59.96 48.02 60.2 C 45.8 60.44 42.64 60.72 40.6 61.38 C 38.56 62.04 39.03 62.58 37.8 63.52 C 36.57 64.46 36.16 64.41 34.47 66.1 C 32.78 67.79 30.64 70.15 29.33 71.96 C 28.02 73.77 28.51 73.65 27.92 75.13 C 27.33 76.61 26.92 77.67 26.38 79.36 C 25.84 81.05 25.69 81.63 25.24 83.57 C 24.79 85.51 24.36 86.59 24.14 89.06 C 23.92 91.53 24.14 93.83 24.14 95.94 C 24.14 98.05 23.78 98.32 24.14 99.62 C 24.5 100.92 24.87 101.28 25.92 102.46 C 26.97 103.64 26.55 103.54 29.37 105.51 C 32.19 107.48 36.84 110.34 40.01 112.32 C 43.18 114.3 43.25 114.2 45.22 115.4 C 47.19 116.6 47.82 117.03 49.86 118.32 C 51.9 119.61 52.67 119.82 55.4 121.85 C 58.13 123.88 60.55 125.54 63.53 128.46 C 66.51 131.38 68.41 133.97 70.32 136.44 C 72.23 138.91 72.11 139.02 73.09 140.8 C 74.07 142.58 74.34 142.63 75.23 145.32 C 76.12 148.01 77.02 151.72 77.56 154.24 C 78.1 156.76 77.86 156.56 77.93 157.93 C 78 159.3 78.07 159.93 77.93 161.11 C 77.79 162.29 77.9 162.63 77.24 163.84 C 76.58 165.05 76.99 164.91 74.65 167.16 C 72.31 169.41 68.08 173.08 65.52 175.11 C 62.96 177.14 63.41 176.56 61.83 177.31 C 60.25 178.06 60.39 178.21 57.6 178.84 C 54.81 179.47 50.76 180.15 47.86 180.48 C 44.96 180.81 45 180.56 43.1 180.48 C 41.2 180.4 40.03 180.53 38.34 180.08 C 36.65 179.63 36.04 179.12 34.64 178.23 C 33.24 177.34 33.03 177.28 31.33 175.65 C 29.63 174.02 27.5 171.78 26.15 170.1 C 24.8 168.42 24.99 168.05 24.56 167.25 C 24.13 166.45 24.1 166.44 23.98 166.1 C 23.86 165.76 24.03 165.68 23.98 165.57 C 23.93 165.46 23.77 165.57 23.72 165.57"></path><path stroke-width="5" fill="none" stroke="black" stroke-linecap="round" stroke-linejoin="round" d="M 101.09765625 74.73828125 C 101.1 75.01 101.1 75.27 101.1 76.1 C 101.1 76.93 101.1 77.27 101.1 78.88 C 101.1 80.49 100.68 76.86 101.1 84.14 C 101.52 91.42 102.4 105.74 103.2 115.29 C 104 124.84 104.28 126.5 105.09 131.9 C 105.9 137.3 106.62 138.49 107.23 142.29 C 107.84 146.09 107.43 146.37 108.16 150.9 C 108.89 155.43 110.04 161.18 110.9 164.94 C 111.76 168.7 111.94 168.01 112.48 169.7 C 113.02 171.39 113.23 172.1 113.59 173.38 C 113.95 174.66 113.9 175.03 114.27 176.11 C 114.64 177.19 115.15 178.16 115.43 178.8 C 115.71 179.44 115.63 179.11 115.68 179.32 C 115.73 179.53 115.68 179.77 115.68 179.83 C 115.68 179.89 115.68 179.75 115.68 179.6 C 115.68 179.45 115.68 179.45 115.68 179.07 C 115.68 178.69 115.68 178.34 115.68 177.68 C 115.68 177.02 115.6 177.12 115.68 175.79 C 115.76 174.46 115.56 173.3 116.08 171.03 C 116.6 168.76 116.1 169.75 118.27 164.46 C 120.44 159.17 124.23 150.79 126.93 144.57 C 129.63 138.35 129.82 137.83 131.75 133.34 C 133.68 128.85 134.64 126.6 136.57 122.1 C 138.5 117.6 139.51 115.02 141.39 110.83 C 143.27 106.64 144.15 105.24 145.96 101.17 C 147.77 97.1 149.35 93.16 150.46 90.46 C 151.57 87.76 151.13 88.59 151.51 87.68 C 151.89 86.77 152.15 86.31 152.37 85.9 C 152.59 85.49 152.56 85.7 152.61 85.65"></path><path stroke-width="5" fill="none" stroke="black" stroke-linecap="round" stroke-linejoin="round" d="M 251.87890625 79.625 C 251.88 79.08 252.02 78.13 251.88 76.89 C 251.74 75.65 251.53 74.59 251.2 73.41 C 250.87 72.23 250.8 71.95 250.25 70.99 C 249.7 70.03 249.35 69.23 248.47 68.59 C 247.59 67.95 247.95 68.47 245.83 67.79 C 243.71 67.11 240.22 65.85 237.88 65.18 C 235.54 64.51 235.85 64.76 234.14 64.45 C 232.43 64.14 231.47 63.98 229.32 63.65 C 227.17 63.32 226.35 62.97 223.37 62.8 C 220.39 62.63 216.94 62.8 214.41 62.8 C 211.88 62.8 212.48 62.66 210.73 62.8 C 208.98 62.94 207.64 62.96 205.68 63.5 C 203.72 64.04 203.2 64.29 200.95 65.48 C 198.7 66.67 196.01 68.38 194.41 69.47 C 192.81 70.56 193.86 69.95 192.93 70.95 C 192 71.95 190.72 73.27 189.74 74.45 C 188.76 75.63 188.98 74.68 188.01 76.85 C 187.04 79.02 185.87 82.44 184.91 85.32 C 183.95 88.2 183.81 88.63 183.21 91.27 C 182.61 93.91 182.43 95.46 181.89 98.5 C 181.35 101.54 181.35 100.7 180.5 106.45 C 179.65 112.2 178.21 122.72 177.64 127.25 C 177.07 131.78 177.64 126.94 177.64 129.09 C 177.64 131.24 177.64 135.73 177.64 137.98 C 177.64 140.23 177.64 137.72 177.64 140.36 C 177.64 143 177.41 148.17 177.64 151.18 C 177.87 154.19 178.25 153.81 178.77 155.39 C 179.29 156.97 179.65 157.5 180.25 159.08 C 180.85 160.66 180.81 161.24 181.77 163.28 C 182.73 165.32 184.09 167.85 185.05 169.29 C 186.01 170.73 185.88 170.12 186.55 170.48 C 187.22 170.84 187.59 170.98 188.42 171.1 C 189.25 171.22 188.23 171.36 190.72 171.1 C 193.21 170.84 197.54 170.59 200.87 169.82 C 204.2 169.05 204.47 168.49 207.35 167.23 C 210.23 165.97 212.69 164.83 215.28 163.5 C 217.87 162.17 217.44 162.67 220.29 160.58 C 223.14 158.49 227.18 155.15 229.54 153.06 C 231.9 150.97 231.19 151.45 232.1 150.13 C 233.01 148.81 233.48 147.52 234.09 146.45 C 234.7 145.38 234.95 145.17 235.16 144.79 C 235.37 144.41 235.16 144.63 235.16 144.53 C 235.16 144.43 235.16 144.33 235.16 144.28"></path><path stroke-width="5" fill="none" stroke="black" stroke-linecap="round" stroke-linejoin="round" d="M 205.50390625 122.51953125 C 205.55 122.52 204.94 122.52 205.73 122.52 C 206.52 122.52 207.76 122.52 209.46 122.52 C 211.16 122.52 212.09 122.52 214.23 122.52 C 216.37 122.52 217.15 122.52 220.18 122.52 C 223.21 122.52 226.71 122.52 229.39 122.52 C 232.07 122.52 232.11 122.52 233.58 122.52 C 235.05 122.52 235.75 122.52 236.76 122.52 C 237.77 122.52 238.05 122.52 238.64 122.52 C 239.23 122.52 239.45 122.52 239.71 122.52 C 239.97 122.52 239.91 122.47 239.96 122.52 C 240.01 122.57 239.96 122.66 239.96 122.75 C 239.96 122.84 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693.75 164.2 694.46 160.24 C 695.17 156.28 695.83 153.46 696.6 148.38 C 697.37 143.3 697.47 141.09 698.31 134.82 C 699.15 128.55 700.13 121.65 700.79 117.02 C 701.45 112.39 701.38 113.28 701.61 111.66 C 701.84 110.04 701.88 109.78 701.95 108.93 C 702.02 108.08 701.9 107.87 701.95 107.41 C 702 106.95 702.14 106.79 702.19 106.63"></path><path stroke-width="5" fill="none" stroke="black" stroke-linecap="round" stroke-linejoin="round" d="M 761.171875 89.75 C 761.17 89.66 761.17 89.92 761.17 89.28 C 761.17 88.64 761.17 87.48 761.17 86.55 C 761.17 85.62 761.17 85.55 761.17 84.61 C 761.17 83.67 761.38 82.92 761.17 81.84 C 760.96 80.76 761.63 80.9 760.13 79.22 C 758.63 77.54 755.91 75 753.67 73.45 C 751.43 71.9 751.1 72.17 748.92 71.47 C 746.74 70.77 745.59 70.31 742.79 69.93 C 739.99 69.55 737.05 69.63 734.93 69.56 C 732.81 69.49 733.12 69.56 732.2 69.56 C 731.28 69.56 731 69.5 730.32 69.56 C 729.64 69.62 729.35 69.49 728.81 69.85 C 728.27 70.21 728.34 70.37 727.61 71.35 C 726.88 72.33 725.91 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170.51 C 747.66 170.39 747.73 170.81 748.57 169.93 C 749.41 169.05 749.33 169.05 751.25 166.12 C 753.17 163.19 756.39 158.3 758.16 155.29 C 759.93 152.28 759.3 152.87 760.08 151.07 C 760.86 149.27 761.55 147.69 762.08 146.27 C 762.61 144.85 762.43 144.76 762.73 143.96 C 763.03 143.16 763.39 142.62 763.56 142.29"></path><path stroke-width="5" fill="none" stroke="black" stroke-linecap="round" stroke-linejoin="round" d="M 740.796875 115.26953125 C 741.53 115.27 742.98 115.27 744.45 115.27 C 745.92 115.27 746.76 115.27 748.14 115.27 C 749.52 115.27 750.49 115.27 751.37 115.27 C 752.25 115.27 751.36 115.27 752.52 115.27 C 753.68 115.27 756.08 115.27 757.18 115.27 C 758.28 115.27 757.73 115.27 758 115.27 C 758.27 115.27 758.37 115.27 758.52 115.27 C 758.67 115.27 758.35 115.27 758.75 115.27 C 759.15 115.27 759.99 115.27 760.51 115.27 C 761.03 115.27 761.07 115.22 761.34 115.27 C 761.61 115.32 761.65 115.47 761.85 115.52 C 762.05 115.57 762.21 115.52 762.36 115.52 C 762.51 115.52 762.51 115.47 762.6 115.52 C 762.69 115.57 762.78 115.67 762.83 115.76 C 762.88 115.85 762.83 115.9 762.83 115.99 C 762.83 116.08 762.83 116.14 762.83 116.23 C 762.83 116.32 762.83 116.36 762.83 116.46 C 762.83 116.56 762.83 116.61 762.83 116.71 C 762.83 116.81 762.78 116.7 762.83 116.96 C 762.88 117.22 762.91 117.32 763.09 117.99 C 763.27 118.66 763.4 118.25 763.71 120.33 C 764.02 122.41 764.04 124.56 764.64 128.39 C 765.24 132.22 765.51 132.88 766.73 139.48 C 767.95 146.08 769.33 153.17 770.74 161.38 C 772.15 169.59 772.99 175.52 773.76 180.53 C 774.53 185.54 774.29 184.8 774.59 186.44 C 774.89 188.08 775.12 188.11 775.25 188.74 C 775.38 189.37 775.2 189.3 775.25 189.57 C 775.3 189.84 775.45 190.02 775.5 190.08 C 775.55 190.14 775.61 190.12 775.5 189.85 C 775.39 189.58 775.22 189.18 774.95 188.75 C 774.68 188.32 774.33 187.92 774.17 187.71"></path></svg>`
)
```

#### Shaking animation.

![shake animation svg](./assets/shake.svg)

```js
anim.setAnimation(
  paths => {
    const range = 5
    const randomShaking = () => Math.random() * range - range / 2
    for (let i = 0; i < paths.length; i += 1) {
      paths[i].commands = paths[i].commands.map((c) => {
        c.point = c.point?.add(new Point(randomShaking(), randomShaking()))
        c.cl = c.cl?.add(new Point(randomShaking(), randomShaking()))
        c.cr = c.cr?.add(new Point(randomShaking(), randomShaking()))
        return c
      })
    }
    return paths
  }
  {
    frames: 3
  }
)
```

#### Colorful animation

![shake animation svg](./assets/color.svg)

```js
const colorfulList = [
  '#F44336',
  '#E91E63',
  '#9C27B0',
  '#673AB7',
  '#3F51B5',
  '#2196F3',
  '#00BCD4',
  '#009688',
  '#4CAF50',
  '#8BC34A',
  '#CDDC39',
  '#FFEB3B',
  '#FFC107',
  '#FF9800',
  '#FF5722'
]

anim.setAnimation(
  (paths, fid) => {
    for (let i = 0; i < paths.length; i += 1) {
      paths[i].attrs.stroke = colorfulList[fid % colorfulList.length]
      paths[i].attrs.fill = colorfulList[(fid + 4) % colorfulList.length]
    }
    return paths
  }
  {
    frames: colorfulList.length
  }
)

```