import Cartesian3 from './Cartesian3.js';
|
import Check from './Check.js';
|
import defaultValue from './defaultValue.js';
|
import defined from './defined.js';
|
import EllipseGeometry from './EllipseGeometry.js';
|
import Ellipsoid from './Ellipsoid.js';
|
import VertexFormat from './VertexFormat.js';
|
|
/**
|
* A description of a circle on the ellipsoid. Circle geometry can be rendered with both {@link Primitive} and {@link GroundPrimitive}.
|
*
|
* @alias CircleGeometry
|
* @constructor
|
*
|
* @param {Object} options Object with the following properties:
|
* @param {Cartesian3} options.center The circle's center point in the fixed frame.
|
* @param {Number} options.radius The radius in meters.
|
* @param {Ellipsoid} [options.ellipsoid=Ellipsoid.WGS84] The ellipsoid the circle will be on.
|
* @param {Number} [options.height=0.0] The distance in meters between the circle and the ellipsoid surface.
|
* @param {Number} [options.granularity=0.02] The angular distance between points on the circle in radians.
|
* @param {VertexFormat} [options.vertexFormat=VertexFormat.DEFAULT] The vertex attributes to be computed.
|
* @param {Number} [options.extrudedHeight=0.0] The distance in meters between the circle's extruded face and the ellipsoid surface.
|
* @param {Number} [options.stRotation=0.0] The rotation of the texture coordinates, in radians. A positive rotation is counter-clockwise.
|
*
|
* @exception {DeveloperError} radius must be greater than zero.
|
* @exception {DeveloperError} granularity must be greater than zero.
|
*
|
* @see CircleGeometry.createGeometry
|
* @see Packable
|
*
|
* @example
|
* // Create a circle.
|
* var circle = new Cesium.CircleGeometry({
|
* center : Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883),
|
* radius : 100000.0
|
* });
|
* var geometry = Cesium.CircleGeometry.createGeometry(circle);
|
*/
|
function CircleGeometry(options) {
|
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
|
var radius = options.radius;
|
|
//>>includeStart('debug', pragmas.debug);
|
Check.typeOf.number('radius', radius);
|
//>>includeEnd('debug');
|
|
var ellipseGeometryOptions = {
|
center : options.center,
|
semiMajorAxis : radius,
|
semiMinorAxis : radius,
|
ellipsoid : options.ellipsoid,
|
height : options.height,
|
extrudedHeight : options.extrudedHeight,
|
granularity : options.granularity,
|
vertexFormat : options.vertexFormat,
|
stRotation : options.stRotation,
|
shadowVolume: options.shadowVolume
|
};
|
this._ellipseGeometry = new EllipseGeometry(ellipseGeometryOptions);
|
this._workerName = 'createCircleGeometry';
|
}
|
|
/**
|
* The number of elements used to pack the object into an array.
|
* @type {Number}
|
*/
|
CircleGeometry.packedLength = EllipseGeometry.packedLength;
|
|
/**
|
* Stores the provided instance into the provided array.
|
*
|
* @param {CircleGeometry} value The value to pack.
|
* @param {Number[]} array The array to pack into.
|
* @param {Number} [startingIndex=0] The index into the array at which to start packing the elements.
|
*
|
* @returns {Number[]} The array that was packed into
|
*/
|
CircleGeometry.pack = function(value, array, startingIndex) {
|
//>>includeStart('debug', pragmas.debug);
|
Check.typeOf.object('value', value);
|
//>>includeEnd('debug');
|
return EllipseGeometry.pack(value._ellipseGeometry, array, startingIndex);
|
};
|
|
var scratchEllipseGeometry = new EllipseGeometry({
|
center : new Cartesian3(),
|
semiMajorAxis : 1.0,
|
semiMinorAxis : 1.0
|
});
|
var scratchOptions = {
|
center : new Cartesian3(),
|
radius : undefined,
|
ellipsoid : Ellipsoid.clone(Ellipsoid.UNIT_SPHERE),
|
height : undefined,
|
extrudedHeight : undefined,
|
granularity : undefined,
|
vertexFormat : new VertexFormat(),
|
stRotation : undefined,
|
semiMajorAxis : undefined,
|
semiMinorAxis : undefined,
|
shadowVolume: undefined
|
};
|
|
/**
|
* Retrieves an instance from a packed array.
|
*
|
* @param {Number[]} array The packed array.
|
* @param {Number} [startingIndex=0] The starting index of the element to be unpacked.
|
* @param {CircleGeometry} [result] The object into which to store the result.
|
* @returns {CircleGeometry} The modified result parameter or a new CircleGeometry instance if one was not provided.
|
*/
|
CircleGeometry.unpack = function(array, startingIndex, result) {
|
var ellipseGeometry = EllipseGeometry.unpack(array, startingIndex, scratchEllipseGeometry);
|
scratchOptions.center = Cartesian3.clone(ellipseGeometry._center, scratchOptions.center);
|
scratchOptions.ellipsoid = Ellipsoid.clone(ellipseGeometry._ellipsoid, scratchOptions.ellipsoid);
|
scratchOptions.height = ellipseGeometry._height;
|
scratchOptions.extrudedHeight = ellipseGeometry._extrudedHeight;
|
scratchOptions.granularity = ellipseGeometry._granularity;
|
scratchOptions.vertexFormat = VertexFormat.clone(ellipseGeometry._vertexFormat, scratchOptions.vertexFormat);
|
scratchOptions.stRotation = ellipseGeometry._stRotation;
|
scratchOptions.shadowVolume = ellipseGeometry._shadowVolume;
|
|
if (!defined(result)) {
|
scratchOptions.radius = ellipseGeometry._semiMajorAxis;
|
return new CircleGeometry(scratchOptions);
|
}
|
|
scratchOptions.semiMajorAxis = ellipseGeometry._semiMajorAxis;
|
scratchOptions.semiMinorAxis = ellipseGeometry._semiMinorAxis;
|
result._ellipseGeometry = new EllipseGeometry(scratchOptions);
|
return result;
|
};
|
|
/**
|
* Computes the geometric representation of a circle on an ellipsoid, including its vertices, indices, and a bounding sphere.
|
*
|
* @param {CircleGeometry} circleGeometry A description of the circle.
|
* @returns {Geometry|undefined} The computed vertices and indices.
|
*/
|
CircleGeometry.createGeometry = function(circleGeometry) {
|
return EllipseGeometry.createGeometry(circleGeometry._ellipseGeometry);
|
};
|
|
/**
|
* @private
|
*/
|
CircleGeometry.createShadowVolume = function(circleGeometry, minHeightFunc, maxHeightFunc) {
|
var granularity = circleGeometry._ellipseGeometry._granularity;
|
var ellipsoid = circleGeometry._ellipseGeometry._ellipsoid;
|
|
var minHeight = minHeightFunc(granularity, ellipsoid);
|
var maxHeight = maxHeightFunc(granularity, ellipsoid);
|
|
return new CircleGeometry({
|
center : circleGeometry._ellipseGeometry._center,
|
radius : circleGeometry._ellipseGeometry._semiMajorAxis,
|
ellipsoid : ellipsoid,
|
stRotation : circleGeometry._ellipseGeometry._stRotation,
|
granularity : granularity,
|
extrudedHeight : minHeight,
|
height : maxHeight,
|
vertexFormat : VertexFormat.POSITION_ONLY,
|
shadowVolume: true
|
});
|
};
|
|
Object.defineProperties(CircleGeometry.prototype, {
|
/**
|
* @private
|
*/
|
rectangle : {
|
get : function() {
|
return this._ellipseGeometry.rectangle;
|
}
|
},
|
/**
|
* For remapping texture coordinates when rendering CircleGeometries as GroundPrimitives.
|
* @private
|
*/
|
textureCoordinateRotationPoints : {
|
get : function() {
|
return this._ellipseGeometry.textureCoordinateRotationPoints;
|
}
|
}
|
});
|
export default CircleGeometry;
|
