Angular Konva Transformer 教程

Transformer 工具以命令式方式附加到节点。在 Angular 中，这意味着创建 ko-transformer，并在视图就绪后将它连接到所选图形。

操作说明：单击矩形以选择它，拖动矩形以移动它，然后单击空白舞台以清除选择。

有关更多详细信息，请参阅 Transformer API 参考。

Transformer 示例

import { Component, ViewChild, AfterViewInit } from '@angular/core';
import { StageConfig } from 'konva/lib/Stage';
import { RectConfig } from 'konva/lib/shapes/Rect';

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

@Component({
  selector: 'app-root',
  standalone: true,
  template: `
    <ko-stage [config]="configStage" (click)="handleStageClick($event.event)">
      <ko-layer>
        <ko-rect
          #rect
          [config]="configRect"
          (click)="handleShapeClick()"
        ></ko-rect>
        <ko-transformer #transformer></ko-transformer>
      </ko-layer>
    </ko-stage>
  `,
  imports: [StageComponent, CoreShapeComponent],
})
export default class App implements AfterViewInit {
  @ViewChild('rect') rect!: any;
  @ViewChild('transformer') transformer!: any;

  public configStage: StageConfig = {
    width: window.innerWidth,
    height: window.innerHeight,
  };
  public configRect: RectConfig = {
    x: 100,
    y: 100,
    width: 100,
    height: 100,
    fill: 'red',
    stroke: 'black',
    strokeWidth: 4,
    draggable: true
  };

  ngAfterViewInit() {
    this.transformer.getNode().nodes([this.rect.getNode()]);
  }

  public handleStageClick(event: any): void {
    if (event?.target === event.target.getStage()) {
      this.transformer.getNode().nodes([]);
    }
  }

  public handleShapeClick(): void {
    this.transformer.getNode().nodes([this.rect.getNode()]);
  }
}

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