ev-olcs
Version:
OpenLayers Cesium integration and plugin library
228 lines • 17 kB
JavaScript
import olcsContribLazyLoader from './LazyLoader.js';
import OLCesium from '../OLCesium.js';
import { resetToNorthZenith, rotateAroundBottomCenter, computeSignedTiltAngleOnGlobe, pickBottomPoint, setHeadingUsingBottomCenter, limitCameraToBoundingSphere } from '../core';
import { toRadians } from '../math.js';
import Observable from 'ol/Observable.js';
/**
* @typedef {Object} ManagerOptions
* @property {import('ol/Map.js').default} map
* @property {import('ol/extent.js').Extent} [cameraExtentInRadians]
* @property {string} [cesiumIonDefaultAccessToken]
*/
export default class Manager extends Observable {
cesiumUrl_;
boundingSphere_;
promise_;
cesiumIonDefaultAccessToken_;
map;
cameraExtentInRadians;
ol3d;
cesiumInitialTilt_ = toRadians(50);
fogDensity = 0.0001;
fogSSEFactor = 25;
minimumZoomDistance = 2;
/**
* Limit the maximum distance to the earth to 10'000km.
*/
maximumZoomDistance = 10000000;
// when closer to 3000m, restrict the available positions harder
limitCameraToBoundingSphereRatio = (height) => (height > 3000 ? 9 : 3);
/**
* @param {string} cesiumUrl
* @param {olcsx.contrib.ManagerOptions} options
* @api
*/
constructor(cesiumUrl, { map, cameraExtentInRadians, cesiumIonDefaultAccessToken }) {
super();
this.cesiumUrl_ = cesiumUrl;
console.assert(map);
this.map = map;
this.cameraExtentInRadians = cameraExtentInRadians || null;
this.cesiumIonDefaultAccessToken_ = cesiumIonDefaultAccessToken;
}
/**
* Lazy load Cesium.
*/
load() {
if (!this.promise_) {
const cesiumLazyLoader = new olcsContribLazyLoader(this.cesiumUrl_);
this.promise_ = cesiumLazyLoader.load().then(() => this.onCesiumLoaded());
}
return this.promise_;
}
/**
* Hook called when Cesium has been lazy loaded.
*/
onCesiumLoaded() {
if (this.cameraExtentInRadians) {
const rect = new Cesium.Rectangle(...this.cameraExtentInRadians);
// Set the fly home rectangle
Cesium.Camera.DEFAULT_VIEW_RECTANGLE = rect;
this.boundingSphere_ = Cesium.BoundingSphere.fromRectangle3D(rect, Cesium.Ellipsoid.WGS84, 300); // lux mean height is 300m
}
if (this.cesiumIonDefaultAccessToken_) {
Cesium.Ion.defaultAccessToken = this.cesiumIonDefaultAccessToken_;
}
this.ol3d = this.instantiateOLCesium();
const scene = this.ol3d.getCesiumScene();
this.configureForUsability(scene);
this.configureForPerformance(scene);
this.dispatchEvent('load');
return this.ol3d;
}
/**
* Application code should override this method.
*/
instantiateOLCesium() {
const ol3d = new OLCesium({ map: this.map });
const scene = ol3d.getCesiumScene();
Cesium.createWorldTerrainAsync().then(tp => scene.terrainProvider = tp);
return ol3d;
}
/**
* Override with custom performance optimization logics, if needed.
*/
configureForPerformance(scene) {
const fog = scene.fog;
fog.enabled = true;
fog.density = this.fogDensity;
fog.screenSpaceErrorFactor = this.fogSSEFactor;
}
/**
* Override with custom usabliity logics, id needed.
*/
configureForUsability(scene) {
const sscController = scene.screenSpaceCameraController;
sscController.minimumZoomDistance = this.minimumZoomDistance;
sscController.maximumZoomDistance = this.maximumZoomDistance;
// Do not see through the terrain. Seeing through the terrain does not make
// sense anyway, except for debugging
scene.globe.depthTestAgainstTerrain = true;
// Use white instead of the black default colour for the globe when tiles are missing
scene.globe.baseColor = Cesium.Color.WHITE;
scene.backgroundColor = Cesium.Color.WHITE;
if (this.boundingSphere_) {
scene.postRender.addEventListener(this.limitCameraToBoundingSphere.bind(this));
}
// Stop rendering Cesium when there is nothing to do. This drastically reduces CPU/GPU consumption.
this.ol3d.enableAutoRenderLoop();
}
/**
* Constrain the camera so that it stays close to the bounding sphere of the map extent.
* Near the ground the allowed distance is shorter.
*/
limitCameraToBoundingSphere() {
const scene = this.ol3d.getCesiumScene();
limitCameraToBoundingSphere(scene.camera, this.boundingSphere_, this.limitCameraToBoundingSphereRatio);
}
/**
* Enable or disable ol3d with a default animation.
*/
toggle3d() {
return this.load().then((/** @const {!olcs.OLCesium} */ ol3d) => {
const is3DCurrentlyEnabled = ol3d.getEnabled();
const scene = ol3d.getCesiumScene();
if (is3DCurrentlyEnabled) {
// Disable 3D
console.assert(this.map);
return resetToNorthZenith(this.map, scene).then(() => {
ol3d.setEnabled(false);
this.dispatchEvent('toggle');
});
}
else {
// Enable 3D
ol3d.setEnabled(true);
this.dispatchEvent('toggle');
return rotateAroundBottomCenter(scene, this.cesiumInitialTilt_);
}
});
}
/**
* Enable ol3d with a view built from parameters.
*/
set3dWithView(lon, lat, elevation, headingDeg, pitchDeg) {
return this.load().then((ol3d) => {
const is3DCurrentlyEnabled = ol3d.getEnabled();
const scene = ol3d.getCesiumScene();
const camera = scene.camera;
const destination = Cesium.Cartesian3.fromDegrees(lon, lat, elevation);
const heading = Cesium.Math.toRadians(headingDeg);
const pitch = Cesium.Math.toRadians(pitchDeg);
const roll = 0;
const orientation = { heading, pitch, roll };
if (!is3DCurrentlyEnabled) {
ol3d.setEnabled(true);
this.dispatchEvent('toggle');
}
camera.setView({
destination,
orientation
});
});
}
/**
* Whether OL-Cesium has been loaded and 3D mode is enabled.
*/
is3dEnabled() {
return !!this.ol3d && this.ol3d.getEnabled();
}
/**
* @return {number}
*/
getHeading() {
return this.map ? this.map.getView().getRotation() || 0 : 0;
}
/**
* @return {number|undefined}
*/
getTiltOnGlobe() {
const scene = this.ol3d.getCesiumScene();
const tiltOnGlobe = computeSignedTiltAngleOnGlobe(scene);
return -tiltOnGlobe;
}
/**
* Set heading.
* This assumes ol3d has been loaded.
*/
setHeading(angle) {
const scene = this.ol3d.getCesiumScene();
const bottom = pickBottomPoint(scene);
if (bottom) {
setHeadingUsingBottomCenter(scene, angle, bottom);
}
}
getOl3d() {
return this.ol3d;
}
getCesiumViewMatrix() {
return this.ol3d.getCesiumScene().camera.viewMatrix;
}
getCesiumScene() {
return this.ol3d.getCesiumScene();
}
/**
* Fly to some rectangle.
* This assumes ol3d has been loaded.
*/
flyToRectangle(rectangle, offset = 0) {
const camera = this.getCesiumScene().camera;
const destination = camera.getRectangleCameraCoordinates(rectangle);
const mag = Cesium.Cartesian3.magnitude(destination) + offset;
Cesium.Cartesian3.normalize(destination, destination);
Cesium.Cartesian3.multiplyByScalar(destination, mag, destination);
return new Promise((resolve, reject) => {
if (!this.cameraExtentInRadians) {
reject();
return;
}
camera.flyTo({
destination,
complete: () => resolve(),
cancel: () => reject(),
endTransform: Cesium.Matrix4.IDENTITY
});
});
}
}
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