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import vtkAbstractWidgetFactory from 'vtk.js/Sources/Widgets/Core/AbstractWidgetFactory';
import vtkBoundingBox from 'vtk.js/Sources/Common/DataModel/BoundingBox';
import vtkBox from 'vtk.js/Sources/Common/DataModel/Box';
import vtkPlane from 'vtk.js/Sources/Common/DataModel/Plane';
import vtkPlaneSource from 'vtk.js/Sources/Filters/Sources/PlaneSource';
import vtkPlaneManipulator from 'vtk.js/Sources/Widgets/Manipulators/PlaneManipulator';
import vtkLineHandleRepresentation from 'vtk.js/Sources/Widgets/Representations/LineHandleRepresentation';
import vtkSphereHandleRepresentation from 'vtk.js/Sources/Widgets/Representations/SphereHandleRepresentation';
import * as vtkMath from 'vtk.js/Sources/Common/Core/Math';
import widgetBehavior from 'vtk.js/Sources/Widgets/Widgets3D/ResliceCursorWidget/behavior';
import stateGenerator from 'vtk.js/Sources/Widgets/Widgets3D/ResliceCursorWidget/state';
import {
boundPlane,
updateState,
transformPlane,
} from 'vtk.js/Sources/Widgets/Widgets3D/ResliceCursorWidget/helpers';
import { viewTypeToPlaneName } from 'vtk.js/Sources/Widgets/Widgets3D/ResliceCursorWidget/Constants';
import { ViewTypes } from 'vtk.js/Sources/Widgets/Core/WidgetManager/Constants';
import { mat4 } from 'gl-matrix';
import vtkMatrixBuilder from 'vtk.js/Sources/Common/Core/MatrixBuilder';
const VTK_INT_MAX = 2147483647;
const { vtkErrorMacro } = macro;
// ----------------------------------------------------------------------------
// Factory
// ----------------------------------------------------------------------------
function vtkResliceCursorWidget(publicAPI, model) {
model.classHierarchy.push('vtkResliceCursorWidget');
model.methodsToLink = ['scaleInPixels'];
// --------------------------------------------------------------------------
// Private methods
// --------------------------------------------------------------------------
/**
* Compute the origin of the reslice plane prior to transformations
* It does not take into account the current view normal. (always axis aligned)
* @param {*} viewType axial, coronal or sagittal
*/
function computeReslicePlaneOrigin(viewType) {
const bounds = model.widgetState.getImage().getBounds();
const center = publicAPI.getWidgetState().getCenter();
const imageCenter = model.widgetState.getImage().getCenter();
// Offset based on the center of the image and how far from it the
// reslice cursor is. This allows us to capture the whole image even
// if we resliced in awkward places.
const offset = [];
for (let i = 0; i < 3; i++) {
offset[i] = -Math.abs(center[i] - imageCenter[i]);
offset[i] *= 2; // give us room
}
// Now set the size of the plane based on the location of the cursor so as to
// at least completely cover the viewed region
const planeSource = vtkPlaneSource.newInstance();
if (viewType === ViewTypes.XZ_PLANE) {
planeSource.setOrigin(
bounds[0] + offset[0],
center[1],
bounds[4] + offset[2]
);
planeSource.setPoint1(
bounds[1] - offset[0],
center[1],
bounds[4] + offset[2]
);
planeSource.setPoint2(
bounds[0] + offset[0],
center[1],
bounds[5] - offset[2]
);
} else if (viewType === ViewTypes.XY_PLANE) {
planeSource.setOrigin(
bounds[0] + offset[0],
bounds[2] + offset[1],
center[2]
);
planeSource.setPoint1(
bounds[1] - offset[0],
bounds[2] + offset[1],
center[2]
);
planeSource.setPoint2(
bounds[0] + offset[0],
bounds[3] - offset[1],
center[2]
);
} else if (viewType === ViewTypes.YZ_PLANE) {
planeSource.setOrigin(
center[0],
bounds[2] + offset[1],
bounds[4] + offset[2]
);
planeSource.setPoint1(
center[0],
bounds[3] - offset[1],
bounds[4] + offset[2]
);
planeSource.setPoint2(
center[0],
bounds[2] + offset[1],
bounds[5] - offset[2]
);
}
return planeSource;
}
/**
* Compute the offset between display reslice cursor position and
* display focal point position
* This will be used to keep the same offset between reslice cursor
* center and focal point when needed.
*/
function computeFocalPointOffsetFromResliceCursorCenter(viewType, renderer) {
const worldFocalPoint = renderer.getActiveCamera().getFocalPoint();
const worldResliceCenter = model.widgetState.getCenter();
const view = renderer.getRenderWindow().getViews()[0];
const dims = view.getViewportSize(renderer);
const aspect = dims[0] / dims[1];
const displayFocalPoint = renderer.worldToNormalizedDisplay(
...worldFocalPoint,
aspect
);
const displayResliceCenter = renderer.worldToNormalizedDisplay(
...worldResliceCenter,
aspect
);
const newOffset = vtkMath.subtract(
displayFocalPoint,
displayResliceCenter,
[0, 0, 0]
);
const cameraOffsets = model.widgetState.getCameraOffsets();
cameraOffsets[viewType] = newOffset;
model.widgetState.setCameraOffsets(cameraOffsets);
}
function updateCamera(
renderer,
normal,
viewType,
resetFocalPoint,
keepCenterFocalDistance
) {
// When the reslice plane is changed, update the camera to look at the
// normal to the reslice plane.
const focalPoint = renderer.getActiveCamera().getFocalPoint();
const distance = renderer.getActiveCamera().getDistance();
const estimatedCameraPosition = vtkMath.multiplyAccumulate(
focalPoint,
normal,
distance,
[0, 0, 0]
);
let newFocalPoint = focalPoint;
if (resetFocalPoint) {
// intersect with the plane to get updated focal point
const intersection = vtkPlane.intersectWithLine(
focalPoint,
estimatedCameraPosition,
model.widgetState.getCenter(), // reslice cursor center
normal
);
newFocalPoint = intersection.x;
}
// Update the estimated focal point so that it will be at the same
// distance from the reslice center
if (keepCenterFocalDistance) {
const worldResliceCenter = model.widgetState.getCenter();
const view = renderer.getRenderWindow().getViews()[0];
const dims = view.getViewportSize(renderer);
const aspect = dims[0] / dims[1];
const displayResliceCenter = renderer.worldToNormalizedDisplay(
...worldResliceCenter,
aspect
);
const realOffset = model.widgetState.getCameraOffsets()[viewType];
const displayFocal = vtkMath.add(
displayResliceCenter,
realOffset,
[0, 0, 0]
);
const worldFocal = renderer.normalizedDisplayToWorld(
...displayFocal,
aspect
);
// Reproject focal point on slice in order to keep it on the
// same plane as the reslice cursor center
const intersection2 = vtkPlane.intersectWithLine(
worldFocal,
estimatedCameraPosition,
worldResliceCenter,
normal
);
newFocalPoint[0] = intersection2.x[0];
newFocalPoint[1] = intersection2.x[1];
newFocalPoint[2] = intersection2.x[2];
}
renderer
.getActiveCamera()
.setFocalPoint(newFocalPoint[0], newFocalPoint[1], newFocalPoint[2]);
const newCameraPosition = vtkMath.multiplyAccumulate(
newFocalPoint,
normal,
distance,
[0, 0, 0]
);
renderer
.getActiveCamera()
.setPosition(
newCameraPosition[0],
newCameraPosition[1],
newCameraPosition[2]
);
// Don't clip away any part of the data.
// Renderer may not have yet actor bounds
const bounds = model.widgetState.getImage().getBounds();
if (resetFocalPoint) {
renderer.resetCamera(bounds);
}
renderer.resetCameraClippingRange(bounds);
}
/**
* Convenient function to return the widget for a given viewType
* @param {string} viewType
* @returns the widget instanced in the given viewType.
*/
function findWidgetForViewType(viewType) {
return publicAPI
.getViewIds()
.map((viewId) => publicAPI.getWidgetForView({ viewId }))
.find((widget) => widget.getViewType() === viewType);
}
/**
* Convenient function to return the ResliceCursorRepresentation for a given viewType
* @param {string} viewType
* @returns an array of 3 representations (for line handles, rotation handles, center handle)
* or an empty array if the widget has not yet been added to the view type.
*/
function findRepresentationsForViewType(viewType) {
const widgetForViewType = findWidgetForViewType(viewType);
return widgetForViewType ? widgetForViewType.getRepresentations() : [];
}
// --------------------------------------------------------------------------
// initialization
// --------------------------------------------------------------------------
publicAPI.getRepresentationsForViewType = (viewType) => {
switch (viewType) {
case ViewTypes.XY_PLANE:
case ViewTypes.XZ_PLANE:
case ViewTypes.YZ_PLANE:
return [
{
builder: vtkLineHandleRepresentation,
labels: [`lineIn${viewTypeToPlaneName[viewType]}`],
initialValues: {
useActiveColor: false,
scaleInPixels: model.scaleInPixels,
},
},
{
builder: vtkSphereHandleRepresentation,
labels: [`rotationIn${viewTypeToPlaneName[viewType]}`],
initialValues: {
useActiveColor: false,
scaleInPixels: model.scaleInPixels,
lighting: false,
},
},
{
builder: vtkSphereHandleRepresentation,
labels: ['center'],
initialValues: {
useActiveColor: false,
scaleInPixels: model.scaleInPixels,
lighting: false,
},
},
];
case ViewTypes.DEFAULT:
case ViewTypes.GEOMETRY:
case ViewTypes.SLICE:
case ViewTypes.VOLUME:
default:
return [];
}
};
publicAPI.setImage = (image) => {
model.widgetState.setImage(image);
const center = image.getCenter();
publicAPI.setCenter(center);
};
publicAPI.setCenter = (center) => {
model.widgetState.setCenter(center);
updateState(
model.widgetState,
model.scaleInPixels,
model.rotationHandlePosition
);
publicAPI.modified();
};
// --------------------------------------------------------------------------
// Methods
// --------------------------------------------------------------------------
publicAPI.updateCameraPoints = (
renderer,
viewType,
resetFocalPoint,
computeFocalPointOffset
) => {
publicAPI.resetCamera(
renderer,
viewType,
resetFocalPoint,
!computeFocalPointOffset
);
if (computeFocalPointOffset) {
computeFocalPointOffsetFromResliceCursorCenter(viewType, renderer);
}
};
/**
*
* @param {*} renderer
* @param {*} viewType
* @param {*} resetFocalPoint Defines if the focal point is reset to the image center
* @param {*} keepCenterFocalDistance Defines if the estimated focal point has to be updated
* in order to keep the same distance to the center (according to the computed focal point
* shift)
*/
publicAPI.resetCamera = (
renderer,
viewType,
resetFocalPoint,
keepCenterFocalDistance
) => {
const center = model.widgetState.getImage().getCenter();
const focalPoint = renderer.getActiveCamera().getFocalPoint();
const position = renderer.getActiveCamera().getPosition();
// Distance is preserved
const distance = Math.sqrt(
vtkMath.distance2BetweenPoints(position, focalPoint)
);
const normal = publicAPI.getPlaneNormalFromViewType(viewType);
// ResetFocalPoint will reset focal point to the center of the image
const estimatedFocalPoint = resetFocalPoint ? center : focalPoint;
const estimatedCameraPosition = vtkMath.multiplyAccumulate(
estimatedFocalPoint,
normal,
distance,
[0, 0, 0]
);
renderer.getActiveCamera().setFocalPoint(...estimatedFocalPoint);
renderer.getActiveCamera().setPosition(...estimatedCameraPosition);
renderer
.getActiveCamera()
.setViewUp(model.widgetState.getPlanes()[viewType].viewUp);
// Project focalPoint onto image plane and preserve distance
updateCamera(
renderer,
normal,
viewType,
resetFocalPoint,
keepCenterFocalDistance
);
};
publicAPI.getPlaneSource = (viewType) => {
// Compute original (i.e. before rotation) plane (i.e. origin, p1, p2)
// centered on cursor center.
const planeSource = computeReslicePlaneOrigin(viewType);
const { normal, viewUp } = model.widgetState.getPlanes()[viewType];
// Adapt plane orientation in order to fit the correct viewUp
// so that the rotations will be more understandable than now.
transformPlane(planeSource, model.widgetState.getCenter(), normal, viewUp);
// Clip to bounds
const boundedOrigin = [...planeSource.getOrigin()];
const boundedP1 = [...planeSource.getPoint1()];
const boundedP2 = [...planeSource.getPoint2()];
boundPlane(
model.widgetState.getImage().getBounds(),
boundedOrigin,
boundedP1,
boundedP2
);
planeSource.setOrigin(...boundedOrigin);
planeSource.setPoint1(...boundedP1);
planeSource.setPoint2(...boundedP2);
return planeSource;
};
publicAPI.getResliceAxes = (viewType) => {
// Compute original (i.e. before rotation) plane (i.e. origin, p1, p2)
// centered on cursor center.
const planeSource = publicAPI.getPlaneSource(viewType);
// TBD: use normal from planeSource ?
const { normal } = model.widgetState.getPlanes()[viewType];
const planeOrigin = planeSource.getOrigin();
const p1 = planeSource.getPoint1();
const planeAxis1 = [];
vtkMath.subtract(p1, planeOrigin, planeAxis1);
vtkMath.normalize(planeAxis1);
const p2 = planeSource.getPoint2();
const planeAxis2 = [];
vtkMath.subtract(p2, planeOrigin, planeAxis2);
vtkMath.normalize(planeAxis2);
const newResliceAxes = mat4.identity(new Float64Array(16));
for (let i = 0; i < 3; i++) {
newResliceAxes[i] = planeAxis1[i];
newResliceAxes[4 + i] = planeAxis2[i];
newResliceAxes[8 + i] = normal[i];
newResliceAxes[12 + i] = planeOrigin[i];
}
return newResliceAxes;
};
publicAPI.updateReslicePlane = (imageReslice, viewType) => {
// Calculate appropriate pixel spacing for the reslicing
const spacing = model.widgetState.getImage().getSpacing();
const planeSource = publicAPI.getPlaneSource(viewType);
const newResliceAxes = publicAPI.getResliceAxes(viewType);
const planeOrigin = planeSource.getOrigin();
const p1 = planeSource.getPoint1();
const planeAxis1 = vtkMath.subtract(p1, planeOrigin, []);
const planeSizeX = vtkMath.normalize(planeAxis1);
const p2 = planeSource.getPoint2();
const planeAxis2 = vtkMath.subtract(p2, planeOrigin, []);
const planeSizeY = vtkMath.normalize(planeAxis2);
const spacingX =
Math.abs(planeAxis1[0] * spacing[0]) +
Math.abs(planeAxis1[1] * spacing[1]) +
Math.abs(planeAxis1[2] * spacing[2]);
const spacingY =
Math.abs(planeAxis2[0] * spacing[0]) +
Math.abs(planeAxis2[1] * spacing[1]) +
Math.abs(planeAxis2[2] * spacing[2]);
// Compute a new set of resliced extents
let extentX = 0;
let extentY = 0;
// Pad extent up to a power of two for efficient texture mapping
// make sure we're working with valid values
const realExtentX =
spacingX === 0 ? Number.MAX_SAFE_INTEGER : planeSizeX / spacingX;
// Sanity check the input data:
// * if realExtentX is too large, extentX will wrap
// * if spacingX is 0, things will blow up.
const value = VTK_INT_MAX >> 1; // eslint-disable-line no-bitwise
Iif (realExtentX > value) {
vtkErrorMacro(
'Invalid X extent: ',
realExtentX,
' on view type : ',
viewType
);
extentX = 0;
} else {
extentX = 1;
while (extentX < realExtentX) {
extentX <<= 1; // eslint-disable-line no-bitwise
}
}
// make sure extentY doesn't wrap during padding
const realExtentY =
spacingY === 0 ? Number.MAX_SAFE_INTEGER : planeSizeY / spacingY;
Iif (realExtentY > value) {
vtkErrorMacro(
'Invalid Y extent:',
realExtentY,
' on view type : ',
viewType
);
extentY = 0;
} else {
extentY = 1;
while (extentY < realExtentY) {
extentY <<= 1; // eslint-disable-line no-bitwise
}
}
const outputSpacingX = extentX === 0 ? 1.0 : planeSizeX / extentX;
const outputSpacingY = extentY === 0 ? 1.0 : planeSizeY / extentY;
let modified = imageReslice.setResliceAxes(newResliceAxes);
modified =
imageReslice.setOutputSpacing([outputSpacingX, outputSpacingY, 1]) ||
modified;
modified =
imageReslice.setOutputOrigin([
0.5 * outputSpacingX,
0.5 * outputSpacingY,
0,
]) || modified;
modified =
imageReslice.setOutputExtent([0, extentX - 1, 0, extentY - 1, 0, 0]) ||
modified;
return modified;
};
/**
* Returns a plane source with origin at cursor center and
* normal from the view.
* @param {ViewType} type: Axial, Coronal or Sagittal
*/
publicAPI.getPlaneSourceFromViewType = (type) => {
const planeSource = vtkPlaneSource.newInstance();
const origin = publicAPI.getWidgetState().getCenter();
const planeNormal = publicAPI.getPlaneNormalFromViewType(type);
planeSource.setNormal(planeNormal);
planeSource.setOrigin(origin);
return planeSource;
};
publicAPI.getPlaneNormalFromViewType = (viewType) =>
publicAPI.getWidgetState().getPlanes()[viewType].normal;
/**
* Returns the normals of the planes that are not viewType.
* @param {ViewType} viewType ViewType to extract other normals
*/
publicAPI.getOtherPlaneNormals = (viewType) =>
[ViewTypes.YZ_PLANE, ViewTypes.XZ_PLANE, ViewTypes.XY_PLANE]
.filter((vt) => vt !== viewType)
.map((vt) => publicAPI.getPlaneNormalFromViewType(vt));
/**
* Return the reslice cursor matrix built as such: [YZ, XZ, XY, center]
*/
publicAPI.getResliceMatrix = () => {
const resliceMatrix = mat4.identity(new Float64Array(16));
for (let i = 0; i < 3; i++) {
resliceMatrix[4 * i + 0] = publicAPI.getPlaneNormalFromViewType(
ViewTypes.YZ_PLANE
)[i];
resliceMatrix[4 * i + 1] = publicAPI.getPlaneNormalFromViewType(
ViewTypes.XZ_PLANE
)[i];
resliceMatrix[4 * i + 2] = publicAPI.getPlaneNormalFromViewType(
ViewTypes.XY_PLANE
)[i];
}
const origin = publicAPI.getWidgetState().getCenter();
const m = vtkMatrixBuilder
.buildFromRadian()
.translate(...origin)
.multiply(resliceMatrix)
.translate(...vtkMath.multiplyScalar([...origin], -1))
.getMatrix();
return m;
};
publicAPI.getDisplayScaleParams = () =>
[ViewTypes.YZ_PLANE, ViewTypes.XZ_PLANE, ViewTypes.XY_PLANE].reduce(
(res, viewType) => {
res[viewType] =
findRepresentationsForViewType(
viewType
)[0]?.getDisplayScaleParams?.();
return res;
},
{}
);
publicAPI.setScaleInPixels = macro.chain(
publicAPI.setScaleInPixels,
(scale) => {
publicAPI.getViewWidgets().forEach((w) => w.setScaleInPixels(scale));
updateState(
model.widgetState,
model.scaleInPixels,
model.rotationHandlePosition
);
}
);
publicAPI.getPlaneExtremities = (viewType) => {
const dirProj = publicAPI.getWidgetState().getPlanes()[viewType].normal;
const length = vtkBoundingBox.getDiagonalLength(
publicAPI.getWidgetState().getImage().getBounds()
);
const p1 = vtkMath.multiplyAccumulate(
publicAPI.getWidgetState().getCenter(),
dirProj,
-length,
[]
);
const p2 = vtkMath.multiplyAccumulate(
publicAPI.getWidgetState().getCenter(),
dirProj,
length,
[]
);
// FIXME: support oriented bounds
const intersectionPoints = vtkBox.intersectWithLine(
publicAPI.getWidgetState().getImage().getBounds(),
p1,
p2
);
return [intersectionPoints.x1, intersectionPoints.x2];
};
}
// ----------------------------------------------------------------------------
/**
* Initializes the model.
* @param {*} initialValues optional object of member variables. initialValues.planes is an optional list of axis names (e.g. ['X', 'Y'])
* @returns the initial model object
*/
const defaultValues = (initialValues) => ({
behavior: widgetBehavior,
widgetState: stateGenerator(initialValues.planes),
rotationHandlePosition: 0.5,
scaleInPixels: true,
manipulator: vtkPlaneManipulator.newInstance(),
...initialValues,
});
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, defaultValues(initialValues));
vtkAbstractWidgetFactory.extend(publicAPI, model, initialValues);
macro.setGet(publicAPI, model, [
'scaleInPixels',
'rotationHandlePosition',
'manipulator',
]);
vtkResliceCursorWidget(publicAPI, model);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(extend, 'vtkResliceCursorWidget');
// ----------------------------------------------------------------------------
export default { newInstance, extend };
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