HTML5 canvas Arc Tutorial

To create an arc shape with Konva, we can instantiate a Konva.Arc() object.

For full list of properties and methods, see the Arc API Reference.

Vanilla

import Konva from 'konva';

const stage = new Konva.Stage({
  container: 'container',
  width: window.innerWidth,
  height: window.innerHeight
});

const layer = new Konva.Layer();
stage.add(layer);

const arc = new Konva.Arc({
  x: stage.width() / 2,
  y: stage.height() / 2,
  innerRadius: 40,
  outerRadius: 70,
  angle: 60,
  fill: 'yellow',
  stroke: 'black',
  strokeWidth: 4
});

layer.add(arc);

Open Sandbox

React

import { Stage, Layer, Arc } from 'react-konva';

const App = () => {
  return (
    <Stage width={window.innerWidth} height={window.innerHeight}>
      <Layer>
        <Arc
          x={window.innerWidth / 2}
          y={window.innerHeight / 2}
          innerRadius={40}
          outerRadius={70}
          angle={60}
          fill="yellow"
          stroke="black"
          strokeWidth={4}
        />
      </Layer>
    </Stage>
  );
};

export default App;

Open Sandbox

Vue

<template>
  <v-stage :config="stageSize">
    <v-layer>
      <v-arc :config="arcConfig" />
    </v-layer>
  </v-stage>
</template>

<script setup>
const stageSize = {
  width: window.innerWidth,
  height: window.innerHeight
};

const arcConfig = {
  x: window.innerWidth / 2,
  y: window.innerHeight / 2,
  innerRadius: 40,
  outerRadius: 70,
  angle: 60,
  fill: 'yellow',
  stroke: 'black',
  strokeWidth: 4
};
</script>

Open Sandbox

Svelte

<script>
  import { Stage, Layer, Arc } from 'svelte-konva';

  const width = window.innerWidth;
  const height = window.innerHeight;
</script>

<Stage config={{ width, height }}>
  <Layer>
    <Arc 
      config={{
        x: width / 2,
        y: height / 2,
        innerRadius: 40,
        outerRadius: 70,
        angle: 60,
        fill: 'yellow',
        stroke: 'black',
        strokeWidth: 4
      }} 
    />
  </Layer>
</Stage>

Angular

import { Component } from '@angular/core';
import { StageConfig } from 'konva/lib/Stage';
import { CircleConfig } from 'konva/lib/shapes/Circle';

import {
  CoreShapeComponent,
  // NgKonvaEventObject,

  StageComponent,
} from 'ng2-konva';

@Component({
  selector: 'app-root',
  template: `
    <ko-stage [config]="configStage">
        <ko-layer>
          <ko-circle
            [config]="configCircle"
            (click)="handleClick($event.event)"
          ></ko-circle>
        </ko-layer>
      </ko-stage>
  `,
  imports: [StageComponent, CoreShapeComponent],
})
export default class App {
  public configStage: StageConfig = {
    width: window.innerWidth,
    height: window.innerHeight,
  };
  public configCircle: CircleConfig = {
    x: 100,
    y: 100,
    radius: 70,
    fill: 'red',
    stroke: 'black',
    strokeWidth: 4,
    draggable: true,
  };

  public handleClick(event: any): void {
    console.log('Hello Circle', event);
  }
}

Open Sandbox