Getting started with vue and canvas via Konva

How to use canvas with Vue?

VueKonva Logo

Vue Konva is a JavaScript library for drawing complex canvas graphics using Vue.

It provides declarative and reactive bindings to the Konva Framework.

All vue-konva components correspond to Konva components of the same name with the prefix ‘v-‘. All the parameters available for Konva objects can add as config in the prop for corresponding vue-konva components.

Core shapes are: v-rect, v-circle, v-ellipse, v-line, v-image, v-text, v-text-path, v-star, v-label, v-path, v-regular-polygon.
Also you can create custom shape.

To get more info about Konva you can read Konva Overview.

Quick Start

Vue.js version 2.4+ is required.

1 Install via npm

vue@3:

npm install vue-konva konva --save

vue@2:

npm install vue-konva@2 konva --save

2 Import and use VueKonva

vue@3:

import { createApp } from 'vue';
import App from './App.vue';
import VueKonva from 'vue-konva';

const app = createApp(App);
app.use(VueKonva);
app.mount('#app');

vue@2:

import Vue from 'vue';
import VueKonva from 'vue-konva';

Vue.use(VueKonva);

3 Reference in your component templates

<template>
  <v-stage :config="configKonva">
    <v-layer>
      <v-circle :config="configCircle"></v-circle>
    </v-layer>
  </v-stage>
</template>

<script>
export default {
  data() {
    return {
      configKonva: {
        width: 200,
        height: 200
      },
      configCircle: {
        x: 100,
        y: 100,
        radius: 70,
        fill: "red",
        stroke: "black",
        strokeWidth: 4
      }
    };
  }
};

</script>

Or use a CDN

<html>
  <head>
    <meta charset="utf-8" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, shrink-to-fit=no"
    />
    <meta http-equiv="x-ua-compatible" content="ie=edge" />
  </head>
  <body>
    <div id="app">
      <v-stage ref="stage" :config="configKonva">
        <v-layer ref="layer">
          <v-circle :config="configCircle"></v-circle>
        </v-layer>
      </v-stage>
    </div>
    <!--1. Link Vue Javascript & Konva-->
    <script src="https://unpkg.com/vue/dist/vue.js"></script>
    <script src="https://unpkg.com/konva@9/konva.min.js"></script>
    <!--2. Link VueKonva Javascript (Plugin automatically installed)-->
    <script src="./lib/vue-konva.min.js"></script>
    <script>
      // 3. Create the Vue instance
      new Vue({
        el: '#app',
        data: {
          configKonva: {
            width: 200,
            height: 200,
          },
          configCircle: {
            x: 100,
            y: 100,
            radius: 70,
            fill: 'red',
            stroke: 'black',
            strokeWidth: 4,
          },
        },
      });
    </script>
  </body>
</html>

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