Angular Konva Filters Tutorial

To apply filters in Konva, set the filters property and cache the node after it is mounted.

This demo uses a blur filter on a circle and calls cache() once the underlying Konva node is available.

Instructions: The demo renders a blurred red circle. Remove cache() in the editor to see why caching is required for filters.

For more details, see the Filters API Reference and cache() documentation.

Filters Example

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

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

@Component({
  selector: 'app-root',
  standalone: true,
  template: `
    <ko-stage [config]="configStage">
      <ko-layer>
        <ko-circle #circle [config]="configCircle"></ko-circle>
      </ko-layer>
    </ko-stage>
  `,
  imports: [StageComponent, CoreShapeComponent],
})
export default class App {
  @ViewChild('circle') circle!: any;
  public configStage: StageConfig = {
    width: window.innerWidth,
    height: window.innerHeight,
  };
  public configCircle: CircleConfig = {
    x: 150,
    y: 150,
    radius: 50,
    fill: 'red',
    filters: [Konva.Filters.Blur],
    blurRadius: 15
  };

  ngAfterViewInit() {
    this.circle.getNode().cache({ offset: 10 });
  }
}

Open Sandbox