61 lines
1.6 KiB
TypeScript
61 lines
1.6 KiB
TypeScript
import { Component, Input, OnInit,ViewChild } from '@angular/core';
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import { Feature} from 'ol';
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import { Geometry } from 'ol/geom';
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import * as extent from 'ol/extent';
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import * as render from 'ol/render';
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import * as style from 'ol/style';
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@Component({
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selector: 'fm-map-feature-thumbnail',
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templateUrl: './feature-thumbnail.component.html',
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styleUrls: ['./feature-thumbnail.component.scss']
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})
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export class GeometryThumbnailComponent implements OnInit {
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constructor() { }
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@ViewChild('canvas') canvas;
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@ViewChild('container') container;
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@Input('feature') feature:Feature<Geometry>;
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ngOnInit(): void {
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}
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render(canvas,width,height,geometry:Geometry) {
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let renderContext = render.toContext(canvas.getContext( '2d'),{ size: [width, height] });
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let strokeStyle = new style.Style({
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stroke: new style.Stroke({ color: 'black',width:1.5 })
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});
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let geom = geometry.clone(),
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line = geom.getCoordinates()[0],
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e = extent.boundingExtent( line );
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let dxy = extent.getCenter(e),
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sxy = [
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(width - 2 ) / extent.getWidth(e),
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(height - 2 ) / extent.getHeight(e)
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];
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let dx = dxy[0],
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dy = dxy[1],
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sx = sxy[0],
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sy = sxy[1];
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geom.translate( -dx, -dy );
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geom.scale( Math.min(sx, sy), -Math.min(sx, sy));
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geom.translate( width / 2, height / 2 );
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renderContext.setStyle( strokeStyle );
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renderContext.drawGeometry( geom );
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}
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ngAfterViewInit() {
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this.render(this.canvas.nativeElement,
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this.container.nativeElement.offsetWidth,
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this.container.nativeElement.offsetHeight,
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this.feature.getGeometry());
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}
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}
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