Angular Konva Custom Shape Tutorial

To create a custom shape with ng2-konva, use the ko-shape component and provide a sceneFunc drawing function.

Inside sceneFunc, you can use the native canvas context together with Konva helpers such as context.fillStrokeShape(shape) to apply fill, stroke, and shadow styles correctly.

Instructions: The demo draws a custom triangle-like shape with canvas path commands.

For more details, see the Shape API Reference.

Custom Shape Example

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

import {
  CoreShapeComponent,
  StageComponent,
} from 'ng2-konva';

@Component({
  selector: 'app-root',
  standalone: true,
  template: `
    <ko-stage [config]="configStage">
      <ko-layer>
        <ko-shape [config]="configShape"></ko-shape>
      </ko-layer>
    </ko-stage>
  `,
  imports: [StageComponent, CoreShapeComponent],
})
export default class App {
  public configStage: StageConfig = {
    width: window.innerWidth,
    height: window.innerHeight,
  };
  public configShape: ShapeConfig = {
    x: 100,
    y: 100,
    fill: 'red',
    stroke: 'black',
    strokeWidth: 2,
    sceneFunc: (context: any, shape: any) => {
      context.beginPath();
      context.moveTo(0, 0);
      context.lineTo(100, 0);
      context.lineTo(50, 100);
      context.closePath();
      context.fillStrokeShape(shape);
    }
  };
}

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