Opendraw

Opendraw is an angular component that manipulates the canvas for drawing content across all devices. It supports touch/pen/mouse devices. It uses pointerEvent to detect the device.

Demo

Try it out here: DEMO or clone this repo and run ng serve for a full demo of opendraw. Angular version 8.2.14.

Features

• Draw with different devices (mouse|pen|touch)
• Export your drawings
• Handle foreground and background layer (image|color)
• Configure drawing style (color|width|shapes|eraser)
• Configure allowed devices (mouse|pen|touch|all)

How to use

First install the package with the command npm i ng-opendraw

Then, in your module.ts, import the library module

import { NgOpendrawModule } from 'ng-opendraw';

And add it to your imports modules. You can now use <ng-opendraw></ng-opendraw> it in any component.html

<ng-opendraw 
    [canHeight]='this.height'
    [canWidth]='this.width'
    [lineWidth]='this.lineWidth'
    [lineColor]='this.getColor()'
    [commandObs]='this.commandObs$'
    [drawStyle]='this.drawStyle'
    [fillShape]='this.fillShape'
    [eraser]='this.eraser'
    [allowedDeviceType]='this.allowedDeviceType'
    [backgroundImage]='this.bgImg'
    [backgroundColor]='this.bgColor'
    (outputEvent)='this.processResult($event)'
    (errorEvent)='this.processError($event)'
></ng-opendraw>

Check out the repo for a full demo code here

Inputs

| Property | Type | Note | | -------- | ---- | ---- | | [canHeight]| number | Height of the canvas area in px | | [canWidth] | number | Width of the canvas area in px | | [lineWidth] | number | Line width in px, default: 3 | | [lineColor] | string | Line color, default: black | | [commandObs] | Observable(DrawCommand) | Triggers a drawcommand like export, clear, ... | | [drawStyle] | DrawStyle | Specify the drawing style like normal, circle, rectangle, line... default: normal | | [fillShape] | boolean | Enable/disable shape filling | | [eraser] | boolean | Enable/disable eraser | | [allowedDeviceType] | DeviceType | Specify the allowed device type like mouse, touch, pen... default: all | | [backgroundImage] | Image/HTMLImageElement | Specify the background layer image | | [backgroundColor] | string | Specify the background layer color |

Outputs

| Event | Type | Note | | -------- | ---- | ---- | | (outputEvent) | string | Emits the exported drawing image | | (errorEvent) | any | Emits all errors |

To-Do / Improvements

• Layers (add|remove|select|hide)
• Undo / Redo actions

NPM

This package is on npm https://www.npmjs.com/package/ng-opendraw

License

This package is under the MIT license