/
WallOutlineGeometry.js
265 lines (237 loc) · 10 KB
/
WallOutlineGeometry.js
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/*global define*/
define([
'./BoundingSphere',
'./Cartesian3',
'./ComponentDatatype',
'./defaultValue',
'./defined',
'./DeveloperError',
'./Ellipsoid',
'./Geometry',
'./GeometryAttribute',
'./GeometryAttributes',
'./IndexDatatype',
'./Math',
'./PrimitiveType',
'./WallGeometryLibrary'
], function(
BoundingSphere,
Cartesian3,
ComponentDatatype,
defaultValue,
defined,
DeveloperError,
Ellipsoid,
Geometry,
GeometryAttribute,
GeometryAttributes,
IndexDatatype,
CesiumMath,
PrimitiveType,
WallGeometryLibrary) {
"use strict";
var scratchCartesian3Position1 = new Cartesian3();
var scratchCartesian3Position2 = new Cartesian3();
/**
* A description of a wall outline. A wall is defined by a series of points,
* which extrude down to the ground. Optionally, they can extrude downwards to a specified height.
*
* @alias WallOutlineGeometry
* @constructor
*
* @param {Cartesian3[]} positions An array of Cartesian objects, which are the points of the wall.
* @param {Number} [options.granularity=CesiumMath.RADIANS_PER_DEGREE] The distance, in radians, between each latitude and longitude. Determines the number of positions in the buffer.
* @param {Number[]} [maximumHeights] An array parallel to <code>positions</code> that give the maximum height of the
* wall at <code>positions</code>. If undefined, the height of each position in used.
* @param {Number[]} [minimumHeights] An array parallel to <code>positions</code> that give the minimum height of the
* wall at <code>positions</code>. If undefined, the height at each position is 0.0.
* @param {Ellipsoid} [ellipsoid=Ellipsoid.WGS84] The ellipsoid for coordinate manipulation
*
* @exception {DeveloperError} positions and maximumHeights must have the same length.
* @exception {DeveloperError} positions and minimumHeights must have the same length.
*
* @see WallGeometry#createGeometry
* @see WallGeometry#fromConstantHeight
*
* @example
* // create a wall outline that spans from ground level to 10000 meters
* var wall = new Cesium.WallOutlineGeometry({
* positions : Cesium.Cartesian3.fromDegreesArrayHeights([
* 19.0, 47.0, 10000.0,
* 19.0, 48.0, 10000.0,
* 20.0, 48.0, 10000.0,
* 20.0, 47.0, 10000.0,
* 19.0, 47.0, 10000.0
* ])
* });
* var geometry = Cesium.WallOutlineGeometry.createGeometry(wall);
*/
var WallOutlineGeometry = function(options) {
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
var wallPositions = options.positions;
var maximumHeights = options.maximumHeights;
var minimumHeights = options.minimumHeights;
//>>includeStart('debug', pragmas.debug);
if (!defined(wallPositions)) {
throw new DeveloperError('positions is required.');
}
if (defined(maximumHeights) && maximumHeights.length !== wallPositions.length) {
throw new DeveloperError('positions and maximumHeights must have the same length.');
}
if (defined(minimumHeights) && minimumHeights.length !== wallPositions.length) {
throw new DeveloperError('positions and minimumHeights must have the same length.');
}
//>>includeEnd('debug');
var granularity = defaultValue(options.granularity, CesiumMath.RADIANS_PER_DEGREE);
var ellipsoid = defaultValue(options.ellipsoid, Ellipsoid.WGS84);
this._positions = wallPositions;
this._minimumHeights = minimumHeights;
this._maximumHeights = maximumHeights;
this._granularity = granularity;
this._ellipsoid = ellipsoid;
this._workerName = 'createWallOutlineGeometry';
};
/**
* A description of a walloutline. A wall is defined by a series of points,
* which extrude down to the ground. Optionally, they can extrude downwards to a specified height.
*
* @memberof WallOutlineGeometry
*
* @param {Cartesian3[]} positions An array of Cartesian objects, which are the points of the wall.
* @param {Number} [maximumHeight] A constant that defines the maximum height of the
* wall at <code>positions</code>. If undefined, the height of each position in used.
* @param {Number} [minimumHeight] A constant that defines the minimum height of the
* wall at <code>positions</code>. If undefined, the height at each position is 0.0.
* @param {Ellipsoid} [ellipsoid=Ellipsoid.WGS84] The ellipsoid for coordinate manipulation
*
* @see WallOutlineGeometry#createGeometry
*
* @example
* // create a wall that spans from 10000 meters to 20000 meters
* var wall = Cesium.WallOutlineGeometry.fromConstantHeights({
* positions : Cesium.Cartesian3.fromDegreesArray([
* 19.0, 47.0,
* 19.0, 48.0,
* 20.0, 48.0,
* 20.0, 47.0,
* 19.0, 47.0,
* ]),
* minimumHeight : 20000.0,
* maximumHeight : 10000.0
* });
* var geometry = Cesium.WallOutlineGeometry.createGeometry(wall);
*/
WallOutlineGeometry.fromConstantHeights = function(options) {
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
var positions = options.positions;
//>>includeStart('debug', pragmas.debug);
if (!defined(positions)) {
throw new DeveloperError('options.positions is required.');
}
//>>includeEnd('debug');
var minHeights;
var maxHeights;
var min = options.minimumHeight;
var max = options.maximumHeight;
var doMin = defined(min);
var doMax = defined(max);
if (doMin || doMax) {
var length = positions.length;
minHeights = (doMin) ? new Array(length) : undefined;
maxHeights = (doMax) ? new Array(length) : undefined;
for (var i = 0; i < length; ++i) {
if (doMin) {
minHeights[i] = min;
}
if (doMax) {
maxHeights[i] = max;
}
}
}
var newOptions = {
positions : positions,
maximumHeights : maxHeights,
minimumHeights : minHeights,
ellipsoid : options.ellipsoid
};
return new WallOutlineGeometry(newOptions);
};
/**
* Computes the geometric representation of a wall outline, including its vertices, indices, and a bounding sphere.
* @memberof WallOutlineGeometry
*
* @param {WallOutlineGeometry} wallGeometry A description of the wall outline.
* @returns {Geometry} The computed vertices and indices.
*
* @exception {DeveloperError} unique positions must be greater than or equal to 2.
*/
WallOutlineGeometry.createGeometry = function(wallGeometry) {
var wallPositions = wallGeometry._positions;
var minimumHeights = wallGeometry._minimumHeights;
var maximumHeights = wallGeometry._maximumHeights;
var granularity = wallGeometry._granularity;
var ellipsoid = wallGeometry._ellipsoid;
var pos = WallGeometryLibrary.computePositions(ellipsoid, wallPositions, maximumHeights, minimumHeights, granularity, false);
var newWallPositions = pos.newWallPositions;
var bottomPositions = pos.bottomPositions;
var topPositions = pos.topPositions;
var length = newWallPositions.length;
var size = length * 2;
var positions = new Float64Array(size);
var positionIndex = 0;
// add lower and upper points one after the other, lower
// points being even and upper points being odd
length /= 3;
var i;
for (i = 0; i < length; ++i) {
var i3 = i * 3;
var topPosition = Cartesian3.fromArray(topPositions, i3, scratchCartesian3Position1);
var bottomPosition = Cartesian3.fromArray(bottomPositions, i3, scratchCartesian3Position2);
// insert the lower point
positions[positionIndex++] = bottomPosition.x;
positions[positionIndex++] = bottomPosition.y;
positions[positionIndex++] = bottomPosition.z;
// insert the upper point
positions[positionIndex++] = topPosition.x;
positions[positionIndex++] = topPosition.y;
positions[positionIndex++] = topPosition.z;
}
var attributes = new GeometryAttributes({
position : new GeometryAttribute({
componentDatatype : ComponentDatatype.DOUBLE,
componentsPerAttribute : 3,
values : positions
})
});
var numVertices = size / 3;
size = 2 * numVertices - 4 + numVertices;
var indices = IndexDatatype.createTypedArray(numVertices, size);
var edgeIndex = 0;
for (i = 0; i < numVertices - 2; i += 2) {
var LL = i;
var LR = i + 2;
var pl = Cartesian3.fromArray(positions, LL * 3, scratchCartesian3Position1);
var pr = Cartesian3.fromArray(positions, LR * 3, scratchCartesian3Position2);
if (Cartesian3.equalsEpsilon(pl, pr, CesiumMath.EPSILON6)) {
continue;
}
var UL = i + 1;
var UR = i + 3;
indices[edgeIndex++] = UL;
indices[edgeIndex++] = LL;
indices[edgeIndex++] = UL;
indices[edgeIndex++] = UR;
indices[edgeIndex++] = LL;
indices[edgeIndex++] = LR;
}
indices[edgeIndex++] = numVertices - 2;
indices[edgeIndex++] = numVertices - 1;
return new Geometry({
attributes : attributes,
indices : indices,
primitiveType : PrimitiveType.LINES,
boundingSphere : new BoundingSphere.fromVertices(positions)
});
};
return WallOutlineGeometry;
});