canvas-drawboard

Introduction

This is a drawboard tool based on vue2.x and canvas. Through this tool you can mark the information you want on a picture and get the corresponding data. In addition, you can also use it as an ordinary drawboard, where you can freely draw graphics on it. The currently supported types are polyline, rectangle, polygon, point, etc. Can support zoom in, zoom out, rotation, translation and other operations.Besides, you can flexibly configure your drawing information.

Installation

npm install canvas-drawboard -S

Usage

import DrawBoard from 'canvas-drawboard'
import 'canvas-drawboard/lib/drawboard.css'
 
Vue.use(DrawBoard);

Example

<template>
  <div id="app">
    <drawboard 
      :url="url" 
      :height="400" 
      :width="500" 
      @updateData="updateData"  
      :labelDataOrigin="labelDataOrigin" 
      @drawEventDone="drawEventDone" />
  </div>
</template>

<script>

export default {
  name: 'App',
  data() {
    return {
       labelDataOrigin: [
        {
          type: "rectangle",
          points: [
            { x: 228, y: 240 },
            { x: 287, y: 240 },
            { x: 287, y: 286 },
            { x: 228, y: 286 },
          ],
          options: {
            path_lineWidth: "4",
            path_strokeStyle: "#f00",
            point_radis: "5", // Judge whether to select the point when clicking
            point_lineWidth: "2",
            point_strokeStyle: "#999", // The color of the point when selected
          },
        },
        {
          type: "rectangle",
          points: [
            { x: 402, y: 214 },
            { x: 438, y: 214 },
            { x: 438, y: 249 },
            { x: 402, y: 249 },
          ],
          options: {
            path_lineWidth: 4,
            path_strokeStyle: "#f00",
            point_radis: 5, // Judge whether to select the point when clicking
            point_lineWidth: 2,
            point_strokeStyle: "#999", // The color of the point when selected
          },
        },
      ],
      url:'https://fuss10.elemecdn.com/a/3f/3302e58f9a181d2509f3dc0fa68b0jpeg.jpeg'
    }
  },
  methods:{
    updateData(data){
      console.log(data);
    },
    drawEventDone() {
      console.log("well done!");
    }
  }
}
</script>

Options

url

• Type: String
• Required: True

The URL of the image to be edited.

labelDataOrigin

• Type: Array
• Required: False

Render graphics based on input data.The format of the data is as follows

[
  {
    "type":"rectangle",
    "points":[
      {"x":228,"y":240},
      {"x":287,"y":240},
      {"x":287,"y":286},
      {"x":228,"y":286}
    ],
    "options":{
      "path_lineWidth":5,
      "path_strokeStyle":"#f00",
      "point_radis":5, // Judge whether to select the point when clicking
      "point_lineWidth":2,
      "point_strokeStyle":"#999" // The color of the point when selected
    }
  },
  {
    "type":"rectangle",
    "points":[
      {"x":402,"y":214},
      {"x":438,"y":214},
      {"x":438,"y":249},
      {"x":402,"y":249}
    ],
    "options":{
      "path_lineWidth":4,
      "path_strokeStyle":"#f00",
      "point_radis":5, // Judge whether to select the point when clicking
      "point_lineWidth":2,
      "point_strokeStyle":"#999" // The color of the point when selected
    }
  }
]

height

• type Number
• Required: False
• default: 400

you can set the height of the canvas container

width

• type Number
• Required: False
• default: 350

you can set the width of the canvas container

userOptions

• Type: Object
• Required: False
• default: {}

You can configure the drawing parameters by this variable.The parameter form is the same as the options in labelDataOrigin above.

loadingData

• Type: Boolean
• Required: False
• default: False

You can control whether to display the image loading animation.

updateData

• Type: Function
• Required: True

Through this method you can get the labeled data.

drawEventDone

• Type: Function
• Required: False

Through this method you can do what you want when finish drawing.

deleteFigureCb

• Type: Function
• Required: False

This is a callback function after deleting an item, and parameter is the index value of the deleted item

clearAllCb

• Type: Function
• Required: False

This is a callback function after clear the drawboard.

activeIndexChange

• Type: Function
• Required: False

This is a callback function after changing active index.

hot key

hot key	Feature
ctrl+scroll	zoomIn/zoomOut
Right click	move

Keywords

Drawboard canvas Vue2.x Data-labeling