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import Cartesian2 from "../Core/Cartesian2.js";
import Cartesian3 from "../Core/Cartesian3.js";
import Cartesian4 from "../Core/Cartesian4.js";
import Cartographic from "../Core/Cartographic.js";
import defined from "../Core/defined.js";
import DeveloperError from "../Core/DeveloperError.js";
import CesiumMath from "../Core/Math.js";
import Matrix4 from "../Core/Matrix4.js";
import OrthographicFrustum from "../Core/OrthographicFrustum.js";
import OrthographicOffCenterFrustum from "../Core/OrthographicOffCenterFrustum.js";
import Transforms from "../Core/Transforms.js";
import SceneMode from "./SceneMode.js";
/**
* Functions that do scene-dependent transforms between rendering-related coordinate systems.
*
* @namespace SceneTransforms
*/
const SceneTransforms = {};
const actualPositionScratch = new Cartesian4(0, 0, 0, 1);
let positionCC = new Cartesian4();
const scratchViewport = new BoundingRectangle();
const scratchWindowCoord0 = new Cartesian2();
const scratchWindowCoord1 = new Cartesian2();
/**
* Transforms a position in world (WGS84 or alternative ellipsoid) coordinates to window coordinates. This is commonly used to place an
* HTML element at the same screen position as an object in the scene.
*
* @param {Scene} scene The scene.
* @param {Cartesian3} position The position in world (WGS84 or alternative ellipsoid) coordinates.
* @param {Cartesian2} [result] An optional object to return the input position transformed to window coordinates.
* @returns {Cartesian2|undefined} The modified result parameter or a new Cartesian2 instance if one was not provided. This may be <code>undefined</code> if the input position is near the center of the ellipsoid.
*
* @example
* // Output the window position of longitude/latitude (0, 0) every time the mouse moves.
* const position = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
* const handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);
* handler.setInputAction(function(movement) {
* console.log(Cesium.SceneTransforms.worldToWindowCoordinates(scene, position));
* }, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
*/
SceneTransforms.worldToWindowCoordinates = function (scene, position, result) {
return SceneTransforms.worldWithEyeOffsetToWindowCoordinates(
scene,
position,
Cartesian3.ZERO,
result,
);
};
const scratchCartesian4 = new Cartesian4();
const scratchEyeOffset = new Cartesian3();
function worldToClip(position, eyeOffset, camera, result) {
const viewMatrix = camera.viewMatrix;
const positionEC = Matrix4.multiplyByVector(
viewMatrix,
Cartesian4.fromElements(
position.x,
position.y,
position.z,
1,
scratchCartesian4,
),
scratchCartesian4,
);
const zEyeOffset = Cartesian3.multiplyComponents(
eyeOffset,
Cartesian3.normalize(positionEC, scratchEyeOffset),
scratchEyeOffset,
);
positionEC.x += eyeOffset.x + zEyeOffset.x;
positionEC.y += eyeOffset.y + zEyeOffset.y;
positionEC.z += zEyeOffset.z;
return Matrix4.multiplyByVector(
camera.frustum.projectionMatrix,
positionEC,
result,
);
}
const scratchMaxCartographic = new Cartographic(
Math.PI,
CesiumMath.PI_OVER_TWO,
);
const scratchProjectedCartesian = new Cartesian3();
const scratchCameraPosition = new Cartesian3();
/**
* @private
*/
SceneTransforms.worldWithEyeOffsetToWindowCoordinates = function (
scene,
position,
eyeOffset,
result,
) {
//>>includeStart('debug', pragmas.debug);
if (!defined(scene)) {
throw new DeveloperError("scene is required.");
}
if (!defined(position)) {
throw new DeveloperError("position is required.");
}
//>>includeEnd('debug');
// Transform for 3D, 2D, or Columbus view
const frameState = scene.frameState;
const actualPosition = SceneTransforms.computeActualEllipsoidPosition(
frameState,
position,
actualPositionScratch,
);
Iif (!defined(actualPosition)) {
return undefined;
}
// Assuming viewport takes up the entire canvas...
const canvas = scene.canvas;
const viewport = scratchViewport;
viewport.x = 0;
viewport.y = 0;
viewport.width = canvas.clientWidth;
viewport.height = canvas.clientHeight;
const camera = scene.camera;
let cameraCentered = false;
if (frameState.mode === SceneMode.SCENE2D) {
const projection = scene.mapProjection;
const maxCartographic = scratchMaxCartographic;
const maxCoord = projection.project(
maxCartographic,
scratchProjectedCartesian,
);
const cameraPosition = Cartesian3.clone(
camera.position,
scratchCameraPosition,
);
const frustum = camera.frustum.clone();
const viewportTransformation = Matrix4.computeViewportTransformation(
viewport,
0.0,
1.0,
new Matrix4(),
);
const projectionMatrix = camera.frustum.projectionMatrix;
const x = camera.positionWC.y;
const eyePoint = Cartesian3.fromElements(
CesiumMath.sign(x) * maxCoord.x - x,
0.0,
-camera.positionWC.x,
);
const windowCoordinates = Transforms.pointToGLWindowCoordinates(
projectionMatrix,
viewportTransformation,
eyePoint,
);
if (
x === 0.0 ||
windowCoordinates.x <= 0.0 ||
windowCoordinates.x >= canvas.clientWidth
) {
cameraCentered = true;
} else {
if (windowCoordinates.x > canvas.clientWidth * 0.5) {
viewport.width = windowCoordinates.x;
camera.frustum.right = maxCoord.x - x;
positionCC = worldToClip(actualPosition, eyeOffset, camera, positionCC);
SceneTransforms.clipToGLWindowCoordinates(
viewport,
positionCC,
scratchWindowCoord0,
);
viewport.x += windowCoordinates.x;
camera.position.x = -camera.position.x;
const right = camera.frustum.right;
camera.frustum.right = -camera.frustum.left;
camera.frustum.left = -right;
positionCC = worldToClip(actualPosition, eyeOffset, camera, positionCC);
SceneTransforms.clipToGLWindowCoordinates(
viewport,
positionCC,
scratchWindowCoord1,
);
} else E{
viewport.x += windowCoordinates.x;
viewport.width -= windowCoordinates.x;
camera.frustum.left = -maxCoord.x - x;
positionCC = worldToClip(actualPosition, eyeOffset, camera, positionCC);
SceneTransforms.clipToGLWindowCoordinates(
viewport,
positionCC,
scratchWindowCoord0,
);
viewport.x = viewport.x - viewport.width;
camera.position.x = -camera.position.x;
const left = camera.frustum.left;
camera.frustum.left = -camera.frustum.right;
camera.frustum.right = -left;
positionCC = worldToClip(actualPosition, eyeOffset, camera, positionCC);
SceneTransforms.clipToGLWindowCoordinates(
viewport,
positionCC,
scratchWindowCoord1,
);
}
Cartesian3.clone(cameraPosition, camera.position);
camera.frustum = frustum.clone();
result = Cartesian2.clone(scratchWindowCoord0, result);
Eif (result.x < 0.0 || result.x > canvas.clientWidth) {
result.x = scratchWindowCoord1.x;
}
}
}
if (frameState.mode !== SceneMode.SCENE2D || cameraCentered) {
// View-projection matrix to transform from world coordinates to clip coordinates
positionCC = worldToClip(actualPosition, eyeOffset, camera, positionCC);
if (
positionCC.z < 0 &&
!(camera.frustum instanceof OrthographicFrustum) &&
!(camera.frustum instanceof OrthographicOffCenterFrustum)
) {
return undefined;
}
result = SceneTransforms.clipToGLWindowCoordinates(
viewport,
positionCC,
result,
);
}
result.y = canvas.clientHeight - result.y;
return result;
};
/**
* Transforms a position in world coordinates to drawing buffer coordinates. This may produce different
* results from SceneTransforms.worldToWindowCoordinates when the browser zoom is not 100%, or on high-DPI displays.
*
* @param {Scene} scene The scene.
* @param {Cartesian3} position The position in world (WGS84 or alternative ellipsoid) coordinates.
* @param {Cartesian2} [result] An optional object to return the input position transformed to window coordinates.
* @returns {Cartesian2|undefined} The modified result parameter or a new Cartesian2 instance if one was not provided. This may be <code>undefined</code> if the input position is near the center of the ellipsoid.
*
* @example
* // Output the window position of longitude/latitude (0, 0) every time the mouse moves.
* const position = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
* const handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);
* handler.setInputAction(function(movement) {
* console.log(Cesium.SceneTransforms.worldToDrawingBufferCoordinates(scene, position));
* }, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
*/
SceneTransforms.worldToDrawingBufferCoordinates = function (
scene,
position,
result,
) {
result = SceneTransforms.worldToWindowCoordinates(scene, position, result);
if (!defined(result)) {
return undefined;
}
return SceneTransforms.transformWindowToDrawingBuffer(scene, result, result);
};
const projectedPosition = new Cartesian3();
const positionInCartographic = new Cartographic();
/**
* @private
*/
SceneTransforms.computeActualEllipsoidPosition = function (
frameState,
position,
result,
) {
const mode = frameState.mode;
if (mode === SceneMode.SCENE3D) {
return Cartesian3.clone(position, result);
}
const projection = frameState.mapProjection;
const cartographic = projection.ellipsoid.cartesianToCartographic(
position,
positionInCartographic,
);
Iif (!defined(cartographic)) {
return undefined;
}
projection.project(cartographic, projectedPosition);
if (mode === SceneMode.COLUMBUS_VIEW) {
return Cartesian3.fromElements(
projectedPosition.z,
projectedPosition.x,
projectedPosition.y,
result,
);
}
Eif (mode === SceneMode.SCENE2D) {
return Cartesian3.fromElements(
0.0,
projectedPosition.x,
projectedPosition.y,
result,
);
}
// mode === SceneMode.MORPHING
const morphTime = frameState.morphTime;
return Cartesian3.fromElements(
CesiumMath.lerp(projectedPosition.z, position.x, morphTime),
CesiumMath.lerp(projectedPosition.x, position.y, morphTime),
CesiumMath.lerp(projectedPosition.y, position.z, morphTime),
result,
);
};
const positionNDC = new Cartesian3();
const positionWC = new Cartesian3();
const viewportTransform = new Matrix4();
/**
* @private
*/
SceneTransforms.clipToGLWindowCoordinates = function (
viewport,
position,
result,
) {
// Perspective divide to transform from clip coordinates to normalized device coordinates
Cartesian3.divideByScalar(position, position.w, positionNDC);
// Viewport transform to transform from clip coordinates to window coordinates
Matrix4.computeViewportTransformation(viewport, 0.0, 1.0, viewportTransform);
Matrix4.multiplyByPoint(viewportTransform, positionNDC, positionWC);
return Cartesian2.fromCartesian3(positionWC, result);
};
/**
* @private
*/
SceneTransforms.transformWindowToDrawingBuffer = function (
scene,
windowPosition,
result,
) {
const canvas = scene.canvas;
const xScale = scene.drawingBufferWidth / canvas.clientWidth;
const yScale = scene.drawingBufferHeight / canvas.clientHeight;
return Cartesian2.fromElements(
windowPosition.x * xScale,
windowPosition.y * yScale,
result,
);
};
const scratchNDC = new Cartesian4();
const scratchWorldCoords = new Cartesian4();
/**
* @private
*/
SceneTransforms.drawingBufferToWorldCoordinates = function (
scene,
drawingBufferPosition,
depth,
result,
) {
const context = scene.context;
const uniformState = context.uniformState;
const currentFrustum = uniformState.currentFrustum;
const near = currentFrustum.x;
const far = currentFrustum.y;
Iif (scene.frameState.useLogDepth) {
// transforming logarithmic depth of form
// log2(z + 1) / log2( far + 1);
// to perspective form
// (far - far * near / z) / (far - near)
const log2Depth = depth * uniformState.log2FarDepthFromNearPlusOne;
const depthFromNear = Math.pow(2.0, log2Depth) - 1.0;
depth = (far * (1.0 - near / (depthFromNear + near))) / (far - near);
}
const viewport = scene.view.passState.viewport;
const ndc = Cartesian4.clone(Cartesian4.UNIT_W, scratchNDC);
ndc.x = ((drawingBufferPosition.x - viewport.x) / viewport.width) * 2.0 - 1.0;
ndc.y =
((drawingBufferPosition.y - viewport.y) / viewport.height) * 2.0 - 1.0;
ndc.z = depth * 2.0 - 1.0;
ndc.w = 1.0;
let worldCoords;
let frustum = scene.camera.frustum;
Iif (!defined(frustum.fovy)) {
const offCenterFrustum = frustum.offCenterFrustum;
if (defined(offCenterFrustum)) {
frustum = offCenterFrustum;
}
worldCoords = scratchWorldCoords;
worldCoords.x =
(ndc.x * (frustum.right - frustum.left) + frustum.left + frustum.right) *
0.5;
worldCoords.y =
(ndc.y * (frustum.top - frustum.bottom) + frustum.bottom + frustum.top) *
0.5;
worldCoords.z = (ndc.z * (near - far) - near - far) * 0.5;
worldCoords.w = 1.0;
worldCoords = Matrix4.multiplyByVector(
uniformState.inverseView,
worldCoords,
worldCoords,
);
} else {
worldCoords = Matrix4.multiplyByVector(
uniformState.inverseViewProjection,
ndc,
scratchWorldCoords,
);
// Reverse perspective divide
const w = 1.0 / worldCoords.w;
Cartesian3.multiplyByScalar(worldCoords, w, worldCoords);
}
return Cartesian3.fromCartesian4(worldCoords, result);
};
export default SceneTransforms;
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