vue-cesium/es/shared/analyses/Viewshed.mjs

Vue 3.x components for CesiumJS.

import '../src/index.mjs';
import DebugCameraPrimitive from '../src/DebugCameraPrimitive.mjs';

"use strict";
class Viewshed {
  constructor(scene, options) {
    const {
      defined,
      DeveloperError,
      PerspectiveFrustum,
      Math: CesiumMath,
      Camera,
      ShadowMap,
      ShadowMode,
      Event,
      Cartesian3,
      defaultValue,
      Color
    } = Cesium;
    if (!defined(scene)) {
      throw new DeveloperError("scene is required.");
    }
    this._scene = scene;
    this._frustum = new PerspectiveFrustum();
    this._frustum.fov = CesiumMath.PI / 3;
    this._frustum.aspectRatio = 3;
    this._frustum.near = 1;
    this._frustum.far = 400;
    this._spotLightCamera = new Camera(this._scene);
    this._frustum.clone(this._spotLightCamera.frustum);
    this._viewshedShadowMap = new ShadowMap({
      context: this._scene.context,
      lightCamera: this._spotLightCamera,
      cascadesEnabled: false
    });
    options = options || {};
    this._scene.globe.shadows = ShadowMode.ENABLED;
    this._viewshedShadowMap._terrainBias.depthBias = 0;
    this._debugCameraPrimitive = new DebugCameraPrimitive({});
    this._enabledChangedEvent = new Event();
    this._position = new Cartesian3();
    this._offsetHeight = defaultValue(options.offsetHeight, 1.8);
    this._visibleColor = defaultValue(options.visibleColor, new Color(0, 1, 0, 1));
    this._invisibleColor = defaultValue(options.invisibleColor, new Color(1, 0, 0, 1));
    this._viewshedShadowMap._viewshedColors = {
      visible: this._visibleColor,
      invisible: this._invisibleColor
    };
    this._showGridLine = options.showGridLine;
    this._debugCameraPrimitive.show = this._showGridLine;
    this._debugCameraPrimitive.lineColor = defaultValue(options.lineColor, new Color(1, 1, 1, 0.4));
    this._debugCameraPrimitive.faceColor = defaultValue(options.faceColor, new Color(1, 1, 1, 0.1));
  }
  get frustum() {
    return this._frustum;
  }
  get fovH() {
    return this._fovH;
  }
  set fovH(e) {
    if (isNaN(e) || void 0 === e || null == e || e < 0 || e >= Math.PI) {
      throw new Error("fovH must be in the range [0, PI).");
    }
    this._fovH = Number(e);
    this.frustum.aspectRatio = Math.tan(0.5 * this._fovH) / Math.tan(0.5 * this._fovV);
    this.frustum.fov = this._fovH > this._fovV ? this._fovH : this._fovV;
  }
  get fovV() {
    return this._fovV;
  }
  set fovV(e) {
    if (isNaN(e) || void 0 === e || null == e || e < 0 || e >= Math.PI) {
      throw new Error("fovV must be in the range [0, PI).");
    }
    this._fovV = Number(e);
    this.frustum.aspectRatio = Math.tan(0.5 * this._fovH) / Math.tan(0.5 * this._fovV);
    this.frustum.fov = this._fovH > this._fovV ? this._fovH : this._fovV;
  }
  get near() {
    return this.frustum.near;
  }
  set near(e) {
    this.frustum.near !== e && (this.frustum.near = e);
  }
  get far() {
    return this.far.near;
  }
  set far(e) {
    this.frustum.far !== e && (this.frustum.far = e);
  }
  get position() {
    return this._position;
  }
  set position(e) {
    if (e instanceof Cesium.Cartesian3) {
      this.setView({
        destination: e.clone(),
        orientation: {
          heading: this._spotLightCamera.heading,
          pitch: this._spotLightCamera.pitch,
          roll: this._spotLightCamera.roll
        }
      });
    }
  }
  get offsetHeight() {
    return this._offsetHeight;
  }
  set offsetHeight(e) {
    if (isNaN(e) || null == e || null == e) {
      throw new Error("Unacceptable offset.");
    }
    this._offsetHeight = Number(e);
    this.setView({
      destination: this._position.clone(),
      orientation: {
        heading: this._spotLightCamera.heading,
        pitch: this._spotLightCamera.pitch,
        roll: this._spotLightCamera.roll
      }
    });
  }
  get heading() {
    return this._spotLightCamera.heading;
  }
  set heading(e) {
    this._spotLightCamera.heading !== e && this._spotLightCamera.setView({
      destination: this._spotLightCamera.positionWC,
      orientation: {
        heading: e,
        pitch: this._spotLightCamera.pitch,
        roll: this._spotLightCamera.roll
      }
    });
  }
  get pitch() {
    return this._spotLightCamera.pitch;
  }
  set pitch(e) {
    this._spotLightCamera.pitch !== e && this._spotLightCamera.setView({
      destination: this._spotLightCamera.positionWC,
      orientation: {
        heading: this._spotLightCamera.heading,
        pitch: e,
        roll: this._spotLightCamera.roll
      }
    });
  }
  get roll() {
    return this._spotLightCamera.roll;
  }
  set roll(e) {
    this._spotLightCamera.roll !== e && this._spotLightCamera.setView({
      destination: this._spotLightCamera.positionWC,
      orientation: {
        heading: this._spotLightCamera.heading,
        pitch: this._spotLightCamera.pitch,
        roll: e
      }
    });
  }
  get shadowMap() {
    return this._viewshedShadowMap;
  }
  get lightCamera() {
    return this._spotLightCamera;
  }
  get enabled() {
    return this._viewshedShadowMap.enabled;
  }
  set enabled(e) {
    if (this._viewshedShadowMap.enabled !== e) {
      if (e) {
        this._viewshedShadowMap.enabled = true;
        this._viewshedShadowMap._pointLightRadius = this._spotLightCamera.frustum.far;
      } else {
        this._viewshedShadowMap.enabled = false;
      }
      this._enabledChangedEvent.raiseEvent(e);
    }
  }
  get enabledChangedEvent() {
    return this._enabledChangedEvent;
  }
  get visibleColor() {
    return this._visibleColor;
  }
  set visibleColor(e) {
    this._visibleColor = e;
    this._viewshedShadowMap._viewshedColors.visible = e;
  }
  get invisibleColor() {
    return this._invisibleColor;
  }
  set invisibleColor(e) {
    this._invisibleColor = e;
    this._viewshedShadowMap._viewshedColors.invisible = e;
  }
  get showGridLine() {
    return this._showGridLine;
  }
  set showGridLine(e) {
    this._showGridLine = e;
    this._debugCameraPrimitive.show = e;
  }
  get faceColor() {
    return this._debugCameraPrimitive.faceColor;
  }
  set faceColor(e) {
    this._debugCameraPrimitive.faceColor = e;
  }
  get lineColor() {
    return this._debugCameraPrimitive.lineColor;
  }
  set lineColor(e) {
    this._debugCameraPrimitive.lineColor = e;
  }
  update(frameState) {
    if (this._viewshedShadowMap.enabled) {
      const { ShadowMode, Matrix3, Matrix4, Math: CesiumMath } = Cesium;
      this._scene.globe.shadows !== ShadowMode.ENABLED && (this._scene.globe.shadows = ShadowMode.ENABLED);
      frameState.shadowMaps.unshift(this._viewshedShadowMap);
      if (!this._frustum.equals(this._spotLightCamera.frustum)) {
        this._frustum.clone(this._spotLightCamera.frustum);
        this._viewshedShadowMap._pointLightRadius = this._frustum.far;
        this.shadowMap._boundingSphere.radius = Math.random();
      }
      if (this._debugCameraPrimitive.show) {
        const modelMatrix = this._debugCameraPrimitive.modelMatrix;
        Matrix4.clone(this._spotLightCamera.inverseViewMatrix, modelMatrix);
        const r0 = Matrix3.fromRotationZ(0.5 * CesiumMath.PI);
        const r1 = Matrix3.fromRotationY(0.5 * CesiumMath.PI);
        const rotation = new Matrix3();
        Matrix3.multiply(r0, r1, rotation);
        Matrix4.multiplyByMatrix3(modelMatrix, rotation, modelMatrix);
        Matrix4.multiplyByUniformScale(modelMatrix, this._spotLightCamera.frustum.far, modelMatrix);
        const frustum = this._spotLightCamera.frustum;
        this._debugCameraPrimitive.fovV = frustum.aspectRatio <= 1 ? frustum.fov : 2 * Math.atan(Math.tan(0.5 * frustum.fov) / frustum.aspectRatio);
        this._debugCameraPrimitive.fovH = 1 < frustum.aspectRatio ? frustum.fov : 2 * Math.atan(Math.tan(0.5 * frustum.fov) * frustum.aspectRatio);
        this._debugCameraPrimitive.segmentH = parseInt(String(this._debugCameraPrimitive.fovH / (Math.PI / 30))) || 1;
        this._debugCameraPrimitive.segmentV = parseInt(String(this._debugCameraPrimitive.fovV / (Math.PI / 30))) || 1;
        this._debugCameraPrimitive.update(frameState);
      }
    }
  }
  setView(options) {
    options = options || {};
    const destination = options.destination;
    if (destination instanceof Cesium.Cartesian3) {
      this._position = destination.clone();
      const offsetHeight = this._offsetHeight;
      const cartographic = Cesium.Cartographic.fromCartesian(destination, this._scene.globe.ellipsoid);
      if (cartographic) {
        cartographic.height = cartographic.height + offsetHeight;
        const cartesian = Cesium.Cartesian3.fromRadians(
          cartographic.longitude,
          cartographic.latitude,
          cartographic.height,
          this._scene.globe.ellipsoid
        );
        options.destination = cartesian;
      }
    }
    this._spotLightCamera.setView(options);
  }
  isDestroyed() {
    return false;
  }
  destroy() {
    this._debugCameraPrimitive && this._debugCameraPrimitive.destroy();
    this._viewshedShadowMap && this._viewshedShadowMap.destroy();
    Cesium.destroyObject(this);
  }
}

export { Viewshed as default };
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