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import Cartesian4 from "./Cartesian4.js";
import CullingVolume from "./CullingVolume.js";
import Frozen from "./Frozen.js";
import defined from "./defined.js";
import DeveloperError from "./DeveloperError.js";
import CesiumMath from "./Math.js";
import Matrix4 from "./Matrix4.js";
/**
* The viewing frustum is defined by 6 planes.
* Each plane is represented by a {@link Cartesian4} object, where the x, y, and z components
* define the unit vector normal to the plane, and the w component is the distance of the
* plane from the origin/camera position.
*
* @alias OrthographicOffCenterFrustum
* @constructor
*
* @param {object} [options] An object with the following properties:
* @param {number} [options.left] The left clipping plane distance.
* @param {number} [options.right] The right clipping plane distance.
* @param {number} [options.top] The top clipping plane distance.
* @param {number} [options.bottom] The bottom clipping plane distance.
* @param {number} [options.near=1.0] The near clipping plane distance.
* @param {number} [options.far=500000000.0] The far clipping plane distance.
*
* @example
* const maxRadii = ellipsoid.maximumRadius;
*
* const frustum = new Cesium.OrthographicOffCenterFrustum();
* frustum.right = maxRadii * Cesium.Math.PI;
* frustum.left = -c.frustum.right;
* frustum.top = c.frustum.right * (canvas.clientHeight / canvas.clientWidth);
* frustum.bottom = -c.frustum.top;
* frustum.near = 0.01 * maxRadii;
* frustum.far = 50.0 * maxRadii;
*/
function OrthographicOffCenterFrustum(options) {
options = options ?? Frozen.EMPTY_OBJECT;
/**
* The left clipping plane.
* @type {number|undefined}
* @default undefined
*/
this.left = options.left;
this._left = undefined;
/**
* The right clipping plane.
* @type {number|undefined}
* @default undefined
*/
this.right = options.right;
this._right = undefined;
/**
* The top clipping plane.
* @type {number|undefined}
* @default undefined
*/
this.top = options.top;
this._top = undefined;
/**
* The bottom clipping plane.
* @type {number|undefined}
* @default undefined
*/
this.bottom = options.bottom;
this._bottom = undefined;
/**
* The distance of the near plane.
* @type {number}
* @default 1.0
*/
this.near = options.near ?? 1.0;
this._near = this.near;
/**
* The distance of the far plane.
* @type {number}
* @default 500000000.0;
*/
this.far = options.far ?? 500000000.0;
this._far = this.far;
this._cullingVolume = new CullingVolume();
this._orthographicMatrix = new Matrix4();
}
function update(frustum) {
//>>includeStart('debug', pragmas.debug);
if (
!defined(frustum.right) ||
!defined(frustum.left) ||
!defined(frustum.top) ||
!defined(frustum.bottom) ||
!defined(frustum.near) ||
!defined(frustum.far)
) {
throw new DeveloperError(
"right, left, top, bottom, near, or far parameters are not set.",
);
}
//>>includeEnd('debug');
if (
frustum.top !== frustum._top ||
frustum.bottom !== frustum._bottom ||
frustum.left !== frustum._left ||
frustum.right !== frustum._right ||
frustum.near !== frustum._near ||
frustum.far !== frustum._far
) {
//>>includeStart('debug', pragmas.debug);
if (frustum.left > frustum.right) {
throw new DeveloperError("right must be greater than left.");
}
if (frustum.bottom > frustum.top) {
throw new DeveloperError("top must be greater than bottom.");
}
if (frustum.near <= 0 || frustum.near > frustum.far) {
throw new DeveloperError(
"near must be greater than zero and less than far.",
);
}
//>>includeEnd('debug');
frustum._left = frustum.left;
frustum._right = frustum.right;
frustum._top = frustum.top;
frustum._bottom = frustum.bottom;
frustum._near = frustum.near;
frustum._far = frustum.far;
frustum._orthographicMatrix = Matrix4.computeOrthographicOffCenter(
frustum.left,
frustum.right,
frustum.bottom,
frustum.top,
frustum.near,
frustum.far,
frustum._orthographicMatrix,
);
}
}
Object.defineProperties(OrthographicOffCenterFrustum.prototype, {
/**
* Gets the orthographic projection matrix computed from the view frustum.
* @memberof OrthographicOffCenterFrustum.prototype
* @type {Matrix4}
* @readonly
*/
projectionMatrix: {
get: function () {
update(this);
return this._orthographicMatrix;
},
},
});
const getPlanesRight = new Cartesian3();
const getPlanesNearCenter = new Cartesian3();
const getPlanesPoint = new Cartesian3();
const negateScratch = new Cartesian3();
/**
* Creates a culling volume for this frustum.
*
* @param {Cartesian3} position The eye position.
* @param {Cartesian3} direction The view direction.
* @param {Cartesian3} up The up direction.
* @returns {CullingVolume} A culling volume at the given position and orientation.
*
* @example
* // Check if a bounding volume intersects the frustum.
* const cullingVolume = frustum.computeCullingVolume(cameraPosition, cameraDirection, cameraUp);
* const intersect = cullingVolume.computeVisibility(boundingVolume);
*/
OrthographicOffCenterFrustum.prototype.computeCullingVolume = function (
position,
direction,
up,
) {
//>>includeStart('debug', pragmas.debug);
if (!defined(position)) {
throw new DeveloperError("position is required.");
}
if (!defined(direction)) {
throw new DeveloperError("direction is required.");
}
if (!defined(up)) {
throw new DeveloperError("up is required.");
}
//>>includeEnd('debug');
const planes = this._cullingVolume.planes;
const t = this.top;
const b = this.bottom;
const r = this.right;
const l = this.left;
const n = this.near;
const f = this.far;
const right = Cartesian3.cross(direction, up, getPlanesRight);
Cartesian3.normalize(right, right);
const nearCenter = getPlanesNearCenter;
Cartesian3.multiplyByScalar(direction, n, nearCenter);
Cartesian3.add(position, nearCenter, nearCenter);
const point = getPlanesPoint;
// Left plane
Cartesian3.multiplyByScalar(right, l, point);
Cartesian3.add(nearCenter, point, point);
let plane = planes[0];
if (!defined(plane)) {
plane = planes[0] = new Cartesian4();
}
plane.x = right.x;
plane.y = right.y;
plane.z = right.z;
plane.w = -Cartesian3.dot(right, point);
// Right plane
Cartesian3.multiplyByScalar(right, r, point);
Cartesian3.add(nearCenter, point, point);
plane = planes[1];
if (!defined(plane)) {
plane = planes[1] = new Cartesian4();
}
plane.x = -right.x;
plane.y = -right.y;
plane.z = -right.z;
plane.w = -Cartesian3.dot(Cartesian3.negate(right, negateScratch), point);
// Bottom plane
Cartesian3.multiplyByScalar(up, b, point);
Cartesian3.add(nearCenter, point, point);
plane = planes[2];
if (!defined(plane)) {
plane = planes[2] = new Cartesian4();
}
plane.x = up.x;
plane.y = up.y;
plane.z = up.z;
plane.w = -Cartesian3.dot(up, point);
// Top plane
Cartesian3.multiplyByScalar(up, t, point);
Cartesian3.add(nearCenter, point, point);
plane = planes[3];
if (!defined(plane)) {
plane = planes[3] = new Cartesian4();
}
plane.x = -up.x;
plane.y = -up.y;
plane.z = -up.z;
plane.w = -Cartesian3.dot(Cartesian3.negate(up, negateScratch), point);
// Near plane
plane = planes[4];
if (!defined(plane)) {
plane = planes[4] = new Cartesian4();
}
plane.x = direction.x;
plane.y = direction.y;
plane.z = direction.z;
plane.w = -Cartesian3.dot(direction, nearCenter);
// Far plane
Cartesian3.multiplyByScalar(direction, f, point);
Cartesian3.add(position, point, point);
plane = planes[5];
if (!defined(plane)) {
plane = planes[5] = new Cartesian4();
}
plane.x = -direction.x;
plane.y = -direction.y;
plane.z = -direction.z;
plane.w = -Cartesian3.dot(Cartesian3.negate(direction, negateScratch), point);
return this._cullingVolume;
};
/**
* Returns the pixel's width and height in meters.
*
* @param {number} drawingBufferWidth The width of the drawing buffer.
* @param {number} drawingBufferHeight The height of the drawing buffer.
* @param {number} distance The distance to the near plane in meters.
* @param {number} pixelRatio The scaling factor from pixel space to coordinate space.
* @param {Cartesian2} result The object onto which to store the result.
* @returns {Cartesian2} The modified result parameter or a new instance of {@link Cartesian2} with the pixel's width and height in the x and y properties, respectively.
*
* @exception {DeveloperError} drawingBufferWidth must be greater than zero.
* @exception {DeveloperError} drawingBufferHeight must be greater than zero.
* @exception {DeveloperError} pixelRatio must be greater than zero.
*
* @example
* // Example 1
* // Get the width and height of a pixel.
* const pixelSize = camera.frustum.getPixelDimensions(scene.drawingBufferWidth, scene.drawingBufferHeight, 0.0, scene.pixelRatio, new Cesium.Cartesian2());
*/
OrthographicOffCenterFrustum.prototype.getPixelDimensions = function (
drawingBufferWidth,
drawingBufferHeight,
distance,
pixelRatio,
result,
) {
update(this);
//>>includeStart('debug', pragmas.debug);
if (!defined(drawingBufferWidth) || !defined(drawingBufferHeight)) {
throw new DeveloperError(
"Both drawingBufferWidth and drawingBufferHeight are required.",
);
}
if (drawingBufferWidth <= 0) {
throw new DeveloperError("drawingBufferWidth must be greater than zero.");
}
if (drawingBufferHeight <= 0) {
throw new DeveloperError("drawingBufferHeight must be greater than zero.");
}
Iif (!defined(distance)) {
throw new DeveloperError("distance is required.");
}
if (!defined(pixelRatio)) {
throw new DeveloperError("pixelRatio is required.");
}
if (pixelRatio <= 0) {
throw new DeveloperError("pixelRatio must be greater than zero.");
}
Iif (!defined(result)) {
throw new DeveloperError("A result object is required.");
}
//>>includeEnd('debug');
const frustumWidth = this.right - this.left;
const frustumHeight = this.top - this.bottom;
const pixelWidth = (pixelRatio * frustumWidth) / drawingBufferWidth;
const pixelHeight = (pixelRatio * frustumHeight) / drawingBufferHeight;
result.x = pixelWidth;
result.y = pixelHeight;
return result;
};
/**
* Returns a duplicate of a OrthographicOffCenterFrustum instance.
*
* @param {OrthographicOffCenterFrustum} [result] The object onto which to store the result.
* @returns {OrthographicOffCenterFrustum} The modified result parameter or a new OrthographicOffCenterFrustum instance if one was not provided.
*/
OrthographicOffCenterFrustum.prototype.clone = function (result) {
if (!defined(result)) {
result = new OrthographicOffCenterFrustum();
}
result.left = this.left;
result.right = this.right;
result.top = this.top;
result.bottom = this.bottom;
result.near = this.near;
result.far = this.far;
// force update of clone to compute matrices
result._left = undefined;
result._right = undefined;
result._top = undefined;
result._bottom = undefined;
result._near = undefined;
result._far = undefined;
return result;
};
/**
* Compares the provided OrthographicOffCenterFrustum componentwise and returns
* <code>true</code> if they are equal, <code>false</code> otherwise.
*
* @param {OrthographicOffCenterFrustum} [other] The right hand side OrthographicOffCenterFrustum.
* @returns {boolean} <code>true</code> if they are equal, <code>false</code> otherwise.
*/
OrthographicOffCenterFrustum.prototype.equals = function (other) {
return (
defined(other) &&
other instanceof OrthographicOffCenterFrustum &&
this.right === other.right &&
this.left === other.left &&
this.top === other.top &&
this.bottom === other.bottom &&
this.near === other.near &&
this.far === other.far
);
};
/**
* Compares the provided OrthographicOffCenterFrustum componentwise and returns
* <code>true</code> if they pass an absolute or relative tolerance test,
* <code>false</code> otherwise.
*
* @param {OrthographicOffCenterFrustum} other The right hand side OrthographicOffCenterFrustum.
* @param {number} relativeEpsilon The relative epsilon tolerance to use for equality testing.
* @param {number} [absoluteEpsilon=relativeEpsilon] The absolute epsilon tolerance to use for equality testing.
* @returns {boolean} <code>true</code> if this and other are within the provided epsilon, <code>false</code> otherwise.
*/
OrthographicOffCenterFrustum.prototype.equalsEpsilon = function (
other,
relativeEpsilon,
absoluteEpsilon,
) {
return (
other === this ||
(defined(other) &&
other instanceof OrthographicOffCenterFrustum &&
CesiumMath.equalsEpsilon(
this.right,
other.right,
relativeEpsilon,
absoluteEpsilon,
) &&
CesiumMath.equalsEpsilon(
this.left,
other.left,
relativeEpsilon,
absoluteEpsilon,
) &&
CesiumMath.equalsEpsilon(
this.top,
other.top,
relativeEpsilon,
absoluteEpsilon,
) &&
CesiumMath.equalsEpsilon(
this.bottom,
other.bottom,
relativeEpsilon,
absoluteEpsilon,
) &&
CesiumMath.equalsEpsilon(
this.near,
other.near,
relativeEpsilon,
absoluteEpsilon,
) &&
CesiumMath.equalsEpsilon(
this.far,
other.far,
relativeEpsilon,
absoluteEpsilon,
))
);
};
export default OrthographicOffCenterFrustum;
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