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

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 in react-designer except action strategies. 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 | backgroundImage | null | The background image of the Designer canvas

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: Panel

You can extend this component to create different panels instead of builtins.

It's a pure React component. The component have object and onUpdate props. You could reach the current state with object, and change this state with onChange callback. Let's create a dummy panel.

class MyPanel extends Panel {
  render() {
    let {object, onChange} = this.props;
    return (
      <PropertyGroup>
          <Columns label="Colors">
            <Column>
              <Button onClick={() => {onChange('color', 'blue')}}>
                Make blue
              </Button>
            </Column>
            <Column>
              <Button onClick={() => {onChange('color', 'yellow')}}>
                Make Yellow
              </Button>
            </Column>
          </Columns>
      </PropertyGroup>
    );
  }
}

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 the onUpdate callback is not necessarry.

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

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
  };
};

Action strategies

The actions of rotate, scale, drag are pure functions. You can change this behaviours 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.