76 lines
2.6 KiB
JavaScript
76 lines
2.6 KiB
JavaScript
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define([
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'../Core/defined',
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'../Core/Rectangle',
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'../Core/sampleTerrainMostDetailed',
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'./SceneMode',
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'../ThirdParty/when'
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], function(
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defined,
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Rectangle,
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sampleTerrainMostDetailed,
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SceneMode,
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when) {
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'use strict';
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/**
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* Computes the final camera location to view a rectangle adjusted for the current terrain.
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* If the terrain does not support availability, the height above the ellipsoid is used.
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*
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* @param {Rectangle} rectangle The rectangle being zoomed to.
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* @param {Scene} scene The scene being used.
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*
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* @returns {Cartographic} The optimal location to place the camera so that the entire rectangle is in view.
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*
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* @private
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*/
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function computeFlyToLocationForRectangle(rectangle, scene) {
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var terrainProvider = scene.terrainProvider;
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var mapProjection = scene.mapProjection;
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var ellipsoid = mapProjection.ellipsoid;
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var positionWithoutTerrain;
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var tmp = scene.camera.getRectangleCameraCoordinates(rectangle);
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if (scene.mode === SceneMode.SCENE3D) {
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positionWithoutTerrain = ellipsoid.cartesianToCartographic(tmp);
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} else {
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positionWithoutTerrain = mapProjection.unproject(tmp);
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}
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if (!defined(terrainProvider)) {
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return when.resolve(positionWithoutTerrain);
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}
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return terrainProvider.readyPromise.then(function() {
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var availability = terrainProvider.availability;
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if (!defined(availability) || scene.mode === SceneMode.SCENE2D) {
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return positionWithoutTerrain;
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}
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var cartographics = [
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Rectangle.center(rectangle),
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Rectangle.southeast(rectangle),
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Rectangle.southwest(rectangle),
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Rectangle.northeast(rectangle),
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Rectangle.northwest(rectangle)
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];
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return computeFlyToLocationForRectangle._sampleTerrainMostDetailed(terrainProvider, cartographics)
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.then(function(positionsOnTerrain) {
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var maxHeight = positionsOnTerrain.reduce(function(currentMax, item) {
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return Math.max(item.height, currentMax);
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}, -Number.MAX_VALUE);
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var finalPosition = positionWithoutTerrain;
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finalPosition.height += maxHeight;
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return finalPosition;
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});
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});
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}
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//Exposed for testing.
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computeFlyToLocationForRectangle._sampleTerrainMostDetailed = sampleTerrainMostDetailed;
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return computeFlyToLocationForRectangle;
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});
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