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import Check from "./Check.js";
import Frozen from "./Frozen.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.default] 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.
* const circle = new Cesium.CircleGeometry({
* center : Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883),
* radius : 100000.0
* });
* const geometry = Cesium.CircleGeometry.createGeometry(circle);
*/
function CircleGeometry(options) {
options = options ?? Frozen.EMPTY_OBJECT;
const radius = options.radius;
//>>includeStart('debug', pragmas.debug);
Check.typeOf.number("radius", radius);
//>>includeEnd('debug');
const 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);
};
const scratchEllipseGeometry = new EllipseGeometry({
center: new Cartesian3(),
semiMajorAxis: 1.0,
semiMinorAxis: 1.0,
});
const scratchOptions = {
center: new Cartesian3(),
radius: undefined,
ellipsoid: Ellipsoid.clone(Ellipsoid.default),
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) {
const ellipseGeometry = EllipseGeometry.unpack(
array,
startingIndex,
scratchEllipseGeometry,
);
scratchOptions.center = Cartesian3.clone(
ellipseGeometry._center,
scratchOptions.center,
);
scratchOptions.ellipsoid = Ellipsoid.clone(
ellipseGeometry._ellipsoid,
scratchOptions.ellipsoid,
);
scratchOptions.ellipsoid = Ellipsoid.clone(
ellipseGeometry._ellipsoid,
scratchEllipseGeometry._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;
Eif (!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,
) {
const granularity = circleGeometry._ellipseGeometry._granularity;
const ellipsoid = circleGeometry._ellipseGeometry._ellipsoid;
const minHeight = minHeightFunc(granularity, ellipsoid);
const 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;
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