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import Cartesian3 from "../Core/Cartesian3.js";
import Cartographic from "../Core/Cartographic.js";
import defined from "../Core/defined.js";
import Ellipsoid from "../Core/Ellipsoid.js";
import CesiumMath from "../Core/Math.js";
import PolygonGeometry from "../Core/PolygonGeometry.js";
import Rectangle from "../Core/Rectangle.js";
/**
* A geodesic polygon to be used with {@link ClippingPlaneCollection} for selectively hiding regions in a model, a 3D tileset, or the globe.
* @alias ClippingPolygon
* @constructor
*
* @param {object} options Object with the following properties:
* @param {Cartesian3[]} options.positions A list of three or more Cartesian coordinates defining the outer ring of the clipping polygon.
* @param {Ellipsoid} [options.ellipsoid=Ellipsoid.default]
*
* @example
* const positions = Cesium.Cartesian3.fromRadiansArray([
* -1.3194369277314022,
* 0.6988062530900625,
* -1.31941,
* 0.69879,
* -1.3193955980204217,
* 0.6988091578771254,
* -1.3193931220959367,
* 0.698743632490865,
* -1.3194358224045408,
* 0.6987471965556998,
* ]);
*
* const polygon = new Cesium.ClippingPolygon({
* positions: positions
* });
*/
function ClippingPolygon(options) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("options", options);
Check.typeOf.object("options.positions", options.positions);
Check.typeOf.number.greaterThanOrEquals(
"options.positions.length",
options.positions.length,
3,
);
//>>includeEnd('debug');
this._ellipsoid = options.ellipsoid ?? Ellipsoid.default;
this._positions = copyArrayCartesian3(options.positions);
/**
* A copy of the input positions.
*
* This is used to detect modifications of the positions in
* <code>coputeRectangle</code>: The rectangle only has
* to be re-computed when these positions have changed.
*
* @type {Cartesian3[]|undefined}
* @private
*/
this._cachedPositions = undefined;
/**
* A cached version of the rectangle that is computed in
* <code>computeRectangle</code>.
*
* This is only re-computed when the positions have changed, as
* determined by comparing the <code>_positions</code> to the
* <code>_cachedPositions</code>
*
* @type {Rectangle|undefined}
* @private
*/
this._cachedRectangle = undefined;
}
/**
* Returns a deep copy of the given array.
*
* If the input is undefined, then <code>undefined</code> is returned.
*
* Otherwise, the result will be a copy of the given array, where
* each element is copied with <code>Cartesian3.clone</code>.
*
* @param {Cartesian3[]|undefined} input The input array
* @returns {Cartesian3[]|undefined} The copy
*/
function copyArrayCartesian3(input) {
Iif (!defined(input)) {
return undefined;
}
const n = input.length;
const output = Array(n);
for (let i = 0; i < n; i++) {
output[i] = Cartesian3.clone(input[i]);
}
return output;
}
/**
* Returns whether the given arrays are component-wise equal.
*
* When both arrays are undefined, then <code>true</code> is returned.
* When only one array is defined, or they are both defined but have
* different lengths, then <code>false</code> is returned.
*
* Otherwise, returns whether the corresponding elements of the arrays
* are equal, as of <code>Cartesian3.equals</code>.
*
* @param {Cartesian3[]|undefined} a The first array
* @param {Cartesian3[]|undefined} b The second array
* @returns {boolean} Whether the arrays are equal
*/
function equalsArrayCartesian3(a, b) {
Iif (!defined(a) && !defined(b)) {
return true;
}
if (defined(a) !== defined(b)) {
return false;
}
Iif (a.length !== b.length) {
return false;
}
const n = a.length;
for (let i = 0; i < n; i++) {
const ca = a[i];
const cb = b[i];
Iif (!Cartesian3.equals(ca, cb)) {
return false;
}
}
return true;
}
Object.defineProperties(ClippingPolygon.prototype, {
/**
* Returns the total number of positions in the polygon, include any holes.
*
* @memberof ClippingPolygon.prototype
* @type {number}
* @readonly
*/
length: {
get: function () {
return this._positions.length;
},
},
/**
* Returns the outer ring of positions.
*
* @memberof ClippingPolygon.prototype
* @type {Cartesian3[]}
* @readonly
*/
positions: {
get: function () {
return this._positions;
},
},
/**
* Returns the ellipsoid used to project the polygon onto surfaces when clipping.
*
* @memberof ClippingPolygon.prototype
* @type {Ellipsoid}
* @readonly
*/
ellipsoid: {
get: function () {
return this._ellipsoid;
},
},
});
/**
* Clones the ClippingPolygon without setting its ownership.
* @param {ClippingPolygon} polygon The ClippingPolygon to be cloned
* @param {ClippingPolygon} [result] The object on which to store the cloned parameters.
* @returns {ClippingPolygon} a clone of the input ClippingPolygon
*/
ClippingPolygon.clone = function (polygon, result) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("polygon", polygon);
//>>includeEnd('debug');
if (!defined(result)) {
return new ClippingPolygon({
positions: polygon.positions,
ellipsoid: polygon.ellipsoid,
});
}
result._ellipsoid = polygon.ellipsoid;
result._positions.length = 0;
result._positions.push(...polygon.positions);
return result;
};
/**
* Compares the provided ClippingPolygons and returns
* <code>true</code> if they are equal, <code>false</code> otherwise.
*
* @param {ClippingPolygon} left The first polygon.
* @param {ClippingPolygon} right The second polygon.
* @returns {boolean} <code>true</code> if left and right are equal, <code>false</code> otherwise.
*/
ClippingPolygon.equals = function (left, right) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("left", left);
Check.typeOf.object("right", right);
//>>includeEnd('debug');
return (
left.ellipsoid.equals(right.ellipsoid) && left.positions === right.positions
);
};
/**
* Computes a cartographic rectangle which encloses the polygon defined by the list of positions, including cases over the international date line and the poles.
*
* @param {Rectangle} [result] An object in which to store the result.
* @returns {Rectangle} The result rectangle
*/
ClippingPolygon.prototype.computeRectangle = function (result) {
if (equalsArrayCartesian3(this._positions, this._cachedPositions)) {
return Rectangle.clone(this._cachedRectangle, result);
}
const rectangle = PolygonGeometry.computeRectangleFromPositions(
this.positions,
this.ellipsoid,
undefined,
result,
);
this._cachedPositions = copyArrayCartesian3(this._positions);
this._cachedRectangle = Rectangle.clone(rectangle);
return rectangle;
};
const scratchRectangle = new Rectangle();
const spherePointScratch = new Cartesian3();
/**
* Computes a rectangle with the spherical extents that encloses the polygon defined by the list of positions, including cases over the international date line and the poles.
*
* @private
*
* @param {Rectangle} [result] An object in which to store the result.
* @returns {Rectangle} The result rectangle with spherical extents.
*/
ClippingPolygon.prototype.computeSphericalExtents = function (result) {
if (!defined(result)) {
result = new Rectangle();
}
const rectangle = this.computeRectangle(scratchRectangle);
let spherePoint = Cartographic.toCartesian(
Rectangle.southwest(rectangle),
this.ellipsoid,
spherePointScratch,
);
// Project into plane with vertical for latitude
let magXY = Math.sqrt(
spherePoint.x * spherePoint.x + spherePoint.y * spherePoint.y,
);
// Use fastApproximateAtan2 for alignment with shader
let sphereLatitude = CesiumMath.fastApproximateAtan2(magXY, spherePoint.z);
let sphereLongitude = CesiumMath.fastApproximateAtan2(
spherePoint.x,
spherePoint.y,
);
result.south = sphereLatitude;
result.west = sphereLongitude;
spherePoint = Cartographic.toCartesian(
Rectangle.northeast(rectangle),
this.ellipsoid,
spherePointScratch,
);
// Project into plane with vertical for latitude
magXY = Math.sqrt(
spherePoint.x * spherePoint.x + spherePoint.y * spherePoint.y,
);
// Use fastApproximateAtan2 for alignment with shader
sphereLatitude = CesiumMath.fastApproximateAtan2(magXY, spherePoint.z);
sphereLongitude = CesiumMath.fastApproximateAtan2(
spherePoint.x,
spherePoint.y,
);
result.north = sphereLatitude;
result.east = sphereLongitude;
return result;
};
export default ClippingPolygon;
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