angular-cesium
Version:
Angular library for working with Cesium.
62 lines • 9.88 kB
JavaScript
import { Injectable } from '@angular/core';
import { CesiumService } from '../../cesium/cesium.service';
import { PrimitivesDrawerService } from '../primitives-drawer/primitives-drawer.service';
import { GeoUtilsService } from '../../geo-utils/geo-utils.service';
/**
+ This drawer is responsible for drawing an arc over the Cesium map.
+ This implementation uses simple PolylineGeometry and Primitive parameters.
+ This doesn't allow us to change the position, color, etc.. of the arc but setShow only.
*/
export class ArcDrawerService extends PrimitivesDrawerService {
constructor(cesiumService) {
super(Cesium.PolylineCollection, cesiumService);
}
_calculateArcPositions(cesiumProps) {
const quality = cesiumProps.quality || 18;
const delta = (cesiumProps.delta) / quality;
const pointsArray = [];
for (let i = 0; i < quality + 1; ++i) {
const point = GeoUtilsService.pointByLocationDistanceAndAzimuth(cesiumProps.center, cesiumProps.radius, cesiumProps.angle + delta * i, true);
pointsArray.push(point);
}
return pointsArray;
}
_calculateTriangle(cesiumProps) {
return [
cesiumProps.center,
GeoUtilsService.pointByLocationDistanceAndAzimuth(cesiumProps.center, cesiumProps.radius, cesiumProps.angle, true)
];
}
_calculateArc(cesiumProps) {
const arcPoints = this._calculateArcPositions(cesiumProps);
return cesiumProps.drawEdges ? arcPoints.concat(this._calculateTriangle(cesiumProps)) : arcPoints;
}
add(cesiumProps) {
cesiumProps.positions = this._calculateArc(cesiumProps);
if (cesiumProps.color) {
const material = Cesium.Material.fromType('Color');
material.uniforms.color = cesiumProps.color;
cesiumProps.material = material;
}
return this._cesiumCollection.add(cesiumProps);
}
update(primitive, cesiumProps) {
if (!cesiumProps.constantColor && cesiumProps.color &&
!primitive.material.uniforms.color.equals(cesiumProps.color)) {
primitive.material.uniforms.color = cesiumProps.color;
}
primitive.width = cesiumProps.width !== undefined ? cesiumProps.width : primitive.width;
primitive.show = cesiumProps.show !== undefined ? cesiumProps.show : primitive.show;
primitive.distanceDisplayCondition = cesiumProps.distanceDisplayCondition !== undefined ?
cesiumProps.distanceDisplayCondition : primitive.distanceDisplayCondition;
primitive.positions = this._calculateArc(cesiumProps);
return primitive;
}
}
ArcDrawerService.decorators = [
{ type: Injectable }
];
ArcDrawerService.ctorParameters = () => [
{ type: CesiumService }
];
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