This project is based on the react-designer package

React-designer

Easy to configure, lightweight, editable vector graphics in your react components.

• Supports polygon and shape designing (with bezier curves)
• Implemented default scale, rotate, drag, and arrange actions
• Custom object types and custom panels

Examples and demonstration: https://ticketplushq.github.io/react-designer

Keymap

Parameter	Default
del or back	Removes the current object
arrows	Move the current object by 1px
shift + arrows	Move the currnet object by 10px
enter	Close the drawing path

Usage

All the entities are pure react components except action strategies in react-designer. I have tried to explain that. I'm starting with components.

Component: Designer

This is the main canvas component which holds the all toolset and manages all drawing data. You could use this component to create drawing canvas.

An example with default configuration:

import Designer, {Text, Rectangle} from 'react-designer';

class App() {
  state = {
    objects: [
      {type: "text", x: 10, y: 20, text: "Hello!", fill: "red"},
      {type: "rect", x: 50, y: 70, fill: "red"}
    ]
  }

  render() {
    return (
      <Designer width={250} height={350}
        objectTypes={{
          'text': Text,
          'rect': Rect
        }}
        onUpdate={(objects) => this.setState({objects})}
        objects={this.state.objects} />
    )
  }
}

The Designer component expects the following parameters:

Parameter	Default
width	300	The width of document
height	300	The height of document
canvasWidth	null	The width of canvas. Same with document if it's null.
canvasHeight	null	The height of canvas. Same with document if it's null.
objects	[]	Your object set.
onUpdate	[]	Your update callback.
objectTypes	Text, Circle, Rectangle, Path	Mapping of object types.
insertMenu		Insert menu component. You can set null for hiding
snapToGrid	1	Snaps the objects accordingly this multipier.
rotator	rotate({object, mouse})	The rotating strategy of objects
scale	scale({object, mouse})	The scaling strategy of objects
drag	drag({object, mouse})	The dragging strategy of objects

Object types are pure react components which are derived from Vector.

Component: Vector

You can create an object type by subclassing Vector component. Each object types have static meta object which contains icon and initial, and optionally editor value.

Example implementation:

class MyRectangle extends Vector {
  static meta = {
    icon: <Icon icon={'rectangle'} size={30} />,
    initial: {
      width: 5,
      height: 5,
      strokeWidth: 0,
      fill: 'yellow',
      radius: 5,
      blendmode: 'normal',
    },
  }

  render() {
    let { object, index } = this.props
    return (
      <rect
        style={this.getStyle()}
        {...this.getObjectAttributes()}
        rx={object.radius}
        width={object.width}
        height={object.height}
      />
    )
  }
}

You can register this object type in your Designer instance.

<Designer
    objectTypes={{rectangle: MyRectangle}}
    width={500}
    height={500}
    onUpdate={...}
    objects={...}
    onUpdate={...} />

Apart from meta options, the vectors have panels static definition which contains the available panels of their.

Here are default panels in Vector component:

static panels = [
    SizePanel,
    TextPanel,
    StylePanel,
    ArrangePanel
];

Component: Preview

You can use Preview component to disable editing tool set and controllers. This component just renders the SVG output of your data. It may be useful for presenting edited or created graphic, instead of building a SVG file.

The parameters are same with Designer component, except for two: the onUpdate callback is not necessary and an additional responsive option can be added, which given the original width and height will expand the preview to cover the width and height of its parent component, scaling its SVG while keeping the original aspect ratio of elements. Note that the original width and height still need to be provided in order for the responsive Preview to work.

<Preview
  objectTypes={{ rectangle: MyRectangle }}
  objects={this.state.objects}
  height={500}
  width={500}
  responsive
/>

Action strategies

The actions of rotate, scale, drag are pure functions. You can change this actions by passing your strategy. The action functions calling with the following object bundle.

{
  object, // the current object
  mouse, // mouse coordinates bundle. it have x and y attribtues
  startPoint, // starting points of mouse and object bundles.
  objectIndex, // the index of the object in the documen,
  objectRefs, // DOM references of objects in the document
}

Here are default action strategies:

Dragger

Moves the object to mouse bundle by the center of object.

// dragger.js
export default ({ object, startPoint, mouse }) => {
  return {
    ...object,
    x: mouse.x - (startPoint.clientX - startPoint.objectX),
    y: mouse.y - (startPoint.clientY - startPoint.objectY),
  }
}

Scaler

Scales the object by the difference with startPoint and current mouse bundle. If the difference lower than zero, changes the position of object.

// scale.js
export default ({ object, startPoint, mouse }) => {
  let { objectX, objectY, clientX, clientY } = startPoint
  let width = startPoint.width + mouse.x - clientX
  let height = startPoint.height + mouse.y - clientY

  return {
    ...object,
    x: width > 0 ? objectX : objectX + width,
    y: height > 0 ? objectY : objectY + height,
    width: Math.abs(width),
    height: Math.abs(height),
  }
}

Rotator

Changes the rotation as degree of object. This action may needs some improvement, I'm calculating with a base value (45 degree) because of the rotator anchor is on the upper right corner of object.

// rotate.js
export default ({ object, startPoint, mouse }) => {
  let angle = Math.atan2(
    startPoint.objectX + (object.width || 0) / 2 - mouse.x,
    startPoint.objectY + (object.height || 0) / 2 - mouse.y
  )

  let asDegree = (angle * 180) / Math.PI
  let rotation = (asDegree + 45) * -1

  return {
    ...object,
    rotate: rotation,
  }
}

To-do

I built this project to create user-designed areas in my side project. So, this was just a hobby project, there may be things missing for a svg editor. I'm open to pull requests and feedback, and I need help to maintain.

Here is a todo list that in my mind. You could extend this list.

• Implement Export panel
  • Export selected object
  • Export document
• Write initial tests and setup test environment
• Add a key map to keep the ratio of objects when scaling
• Implement theme support for UI

Release Notes

1.0.8

• Move React-dom dependency to dev-dependencies

1.0.6

• Designer component exported as default now.
• Added insertMenu prop to Designer component. 5176 4001 3962 0396 12 26 109