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omi-canvas

Perfect fusion of web components, jsx and canvas.

The current version is v0.0.0. v1.0.0 is coming soon.

import { render, define, WeElement } from 'omi'
import 'omi-canvas'
import omiUrl from './omi.jpg'

define('my-app', class extends WeElement {
  static observe = true

  data = {
    scale: 0.5
  }

  css() {
    return `
        div{
          text-align: center;
        }`
  }

  onClick = (evt) => {
    this.data.scale = 0.5 + Math.random() * 0.1
  }

  render() {
    return (
      <div>
        <h1>Omi</h1>
        <omi-canvas width={400} height={400} css='border: 1px solid #ccc;'>
          <text
            text='Hello omi-canvas'
            font='30px Segoe UI'
            color='#ff7700'
            baseline='top'
            x={80}
            y={100}
          />
          <bitmap
            onClick={this.onClick}
            src={omiUrl}
            cursor='pointer'
            scale={this.data.scale}
            x={130}
            y={140}
          />
          <group alpha={0.5} y={270}>
            <text
              text='I am in a group.'
              font='30px Segoe UI'
              color='#ff7700'
              baseline='top'
              x={80}
            />
          </group>
        </omi-canvas>
      </div>
    )
  }
})

render(<my-app />, 'body')

The effect shown below:

Tag Supported

Name	Describe
text	Used to display text
bitmap	Used to display image
group	Used to group elements. Group can nested group.

Property

Transform

name	Describe
x	Horizontal offset
y	Vertical offset
scaleX	Horizontal scaling
scaleY	Vertical scaling
scale	Horizontal and Vertical scaling
rotation	rotation
skewX	skewX
skewY	skewY
originX	Rotation base point X
originY	Rotation base point Y

Alpha

Name	Describe
alpha	The transparency of the element

Notice that the father and son have set up alpha to do multiplicative stacking.

compositeOperation

Name	Describe
compositeOperation	The superposition pattern drawn from the source image to the target image

Notice that if you don't have a definition of compositeOperation to look up, find the nearest compositeOperation's parent container as its own compositeOperation.

Cursor

Name	Describe
cursor	The shape of the mouse

Fixed

Name	Describe
fixed	Whether to fixed or not, the default is false, and set to true will not overlay the transform of ancestors.

Shadow

Name	Describe
shadow	shadow

Usage:

<text
  text='omi'
  shadow = {
    color: '#42B035',
    offsetX: -5,
    offsetY: 5,
    blur: 10
    } 
/>

Events Supported

Supported List
onClick
onTouchStart
onTouchMove
onTouchEnd
onTouchCancel
onMouseMove
onMouseDown
onMouseUp
onMouseOver
onMouseOut
onDblClick
onContextMenu
onDrag

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