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import { utilities as csUtils, getEnabledElement } from '@cornerstonejs/core';
import type { ContourSegmentationAnnotation } from '../../types/ContourSegmentationAnnotation';
import { ContourWindingDirection } from '../../types/ContourAnnotation';
import * as math from '../math';
import updateContourPolyline from '../contours/updateContourPolyline';
import {
addAnnotation,
removeAnnotation,
getChildAnnotations,
addChildAnnotation,
clearParentAnnotation,
} from '../../stateManagement/annotation/annotationState';
import { addContourSegmentationAnnotation } from './addContourSegmentationAnnotation';
import { removeContourSegmentationAnnotation } from './removeContourSegmentationAnnotation';
import { triggerAnnotationModified } from '../../stateManagement/annotation/helpers/state';
import triggerAnnotationRenderForViewportIds from '../triggerAnnotationRenderForViewportIds';
import { getViewportIdsWithToolToRender } from '../viewportFilters';
import { hasToolByName, hasTool } from '../../store/addTool';
/**
* Default tool name for contour segmentation operations.
*/
const DEFAULT_CONTOUR_SEG_TOOL_NAME = 'PlanarFreehandContourSegmentationTool';
/**
* Processes multiple intersecting annotations with a source annotation.
* This function handles the complex case where a source annotation intersects
* with multiple target annotations, requiring multiple operations.
*
* @param viewport - The viewport context.
* @param sourceAnnotation - The newly completed contour segmentation.
* @param sourcePolyline - The polyline of the source annotation in canvas space.
* @param intersectingContours - Array of intersecting contour information.
*/
function processMultipleIntersections(
viewport: Types.IViewport,
sourceAnnotation: ContourSegmentationAnnotation,
sourcePolyline: Types.Point2[],
intersectingContours: Array<{
targetAnnotation: ContourSegmentationAnnotation;
targetPolyline: Types.Point2[];
isContourHole: boolean;
}>
): void {
// Separate hole operations from merge/subtract operations
const holeOperations = intersectingContours.filter(
(item) => item.isContourHole
);
const mergeOperations = intersectingContours.filter(
(item) => !item.isContourHole
);
// Handle hole operations first (source becomes a hole in target annotations)
if (holeOperations.length > 0) {
// For hole operations, we only use the first target (largest containing contour)
const primaryHoleTarget = holeOperations[0];
createPolylineHole(
viewport,
primaryHoleTarget.targetAnnotation,
sourceAnnotation
);
updateViewportsForAnnotations(viewport, [
sourceAnnotation,
primaryHoleTarget.targetAnnotation,
]);
return;
}
// Handle merge/subtract operations
if (mergeOperations.length === 0) {
return;
}
// Check if the necessary tool for creating new combined contours is registered.
if (!hasToolByName(DEFAULT_CONTOUR_SEG_TOOL_NAME)) {
console.warn(
`${DEFAULT_CONTOUR_SEG_TOOL_NAME} is not registered in cornerstone. Cannot process multiple intersections.`
);
return;
}
// Process each intersection sequentially
processSequentialIntersections(
viewport,
sourceAnnotation,
sourcePolyline,
mergeOperations
);
}
/**
* Processes intersections sequentially, combining or subtracting one at a time.
*/
function processSequentialIntersections(
viewport: Types.IViewport,
sourceAnnotation: ContourSegmentationAnnotation,
sourcePolyline: Types.Point2[],
mergeOperations: Array<{
targetAnnotation: ContourSegmentationAnnotation;
targetPolyline: Types.Point2[];
isContourHole: boolean;
}>
): void {
const { element } = viewport;
const allAnnotationsToRemove = [sourceAnnotation];
const allResultPolylines: Types.Point2[][] = [];
const allHoles: Array<{
annotation: ContourSegmentationAnnotation;
polyline: Types.Point2[];
}> = [];
// Collect all holes from target annotations
mergeOperations.forEach(({ targetAnnotation }) => {
const holes = getContourHolesData(viewport, targetAnnotation);
allHoles.push(...holes);
allAnnotationsToRemove.push(targetAnnotation);
});
// Determine operation type based on whether source start point is inside any target polyline
const sourceStartPoint = sourcePolyline[0];
const shouldMerge = mergeOperations.some(({ targetPolyline }) =>
math.polyline.containsPoint(targetPolyline, sourceStartPoint)
);
if (shouldMerge) {
// Merge all polylines together
let resultPolyline = sourcePolyline;
mergeOperations.forEach(({ targetPolyline }) => {
resultPolyline = math.polyline.mergePolylines(
resultPolyline,
targetPolyline
);
});
allResultPolylines.push(resultPolyline);
} else {
// Subtract source from each target
mergeOperations.forEach(({ targetPolyline }) => {
const subtractedPolylines = math.polyline.subtractPolylines(
targetPolyline,
sourcePolyline
);
allResultPolylines.push(...subtractedPolylines);
});
}
// Remove all original annotations
allAnnotationsToRemove.forEach((annotation) => {
removeAnnotation(annotation.annotationUID);
removeContourSegmentationAnnotation(annotation);
});
// Detach holes from old annotations
allHoles.forEach((holeData) => clearParentAnnotation(holeData.annotation));
// Create new annotations from result polylines
const baseAnnotation = mergeOperations[0].targetAnnotation;
const newAnnotations: ContourSegmentationAnnotation[] = [];
allResultPolylines.forEach((polyline) => {
if (!polyline || polyline.length < 3) {
console.warn(
'Skipping creation of new annotation due to invalid polyline:',
polyline
);
return;
}
const newAnnotation = createNewAnnotationFromPolyline(
viewport,
baseAnnotation,
polyline
);
addAnnotation(newAnnotation, element);
addContourSegmentationAnnotation(newAnnotation);
triggerAnnotationModified(newAnnotation, viewport.element);
newAnnotations.push(newAnnotation);
});
// Reassign holes to new annotations
reassignHolesToNewAnnotations(viewport, allHoles, newAnnotations);
updateViewportsForAnnotations(viewport, allAnnotationsToRemove);
}
/**
* Creates a new annotation from a polyline, copying metadata from a base annotation.
*/
function createNewAnnotationFromPolyline(
viewport: Types.IViewport,
baseAnnotation: ContourSegmentationAnnotation,
polyline: Types.Point2[]
): ContourSegmentationAnnotation {
const startPointWorld = viewport.canvasToWorld(polyline[0]);
const endPointWorld = viewport.canvasToWorld(polyline[polyline.length - 1]);
const newAnnotation: ContourSegmentationAnnotation = {
metadata: {
...baseAnnotation.metadata,
toolName: DEFAULT_CONTOUR_SEG_TOOL_NAME,
originalToolName:
baseAnnotation.metadata.originalToolName ||
baseAnnotation.metadata.toolName,
},
data: {
cachedStats: {},
handles: {
points: [startPointWorld, endPointWorld],
textBox: baseAnnotation.data.handles.textBox
? { ...baseAnnotation.data.handles.textBox }
: undefined,
},
contour: {
polyline: [],
closed: true,
},
spline: baseAnnotation.data.spline,
segmentation: {
...baseAnnotation.data.segmentation,
},
},
annotationUID: csUtils.uuidv4() as string,
highlighted: true,
invalidated: true,
isLocked: false,
isVisible: undefined,
interpolationUID: baseAnnotation.interpolationUID,
interpolationCompleted: baseAnnotation.interpolationCompleted,
};
updateContourPolyline(
newAnnotation,
{
points: polyline,
closed: true,
targetWindingDirection: ContourWindingDirection.Clockwise,
},
viewport
);
return newAnnotation;
}
/**
* Reassigns holes to new annotations based on containment.
*/
function reassignHolesToNewAnnotations(
viewport: Types.IViewport,
holes: Array<{
annotation: ContourSegmentationAnnotation;
polyline: Types.Point2[];
}>,
newAnnotations: ContourSegmentationAnnotation[]
): void {
holes.forEach((holeData) => {
// Find which new annotation should contain this hole
const parentAnnotation = newAnnotations.find((annotation) => {
const parentPolyline = convertContourPolylineToCanvasSpace(
annotation.data.contour.polyline,
viewport
);
return math.polyline.containsPoints(parentPolyline, holeData.polyline);
});
if (parentAnnotation) {
addChildAnnotation(parentAnnotation, holeData.annotation);
}
});
}
/**
* Helper function to get hole data from an annotation.
*/
function getContourHolesData(
viewport: Types.IViewport,
annotation: ContourSegmentationAnnotation
): Array<{
annotation: ContourSegmentationAnnotation;
polyline: Types.Point2[];
}> {
return getChildAnnotations(annotation).map((holeAnnotation) => {
const contourHoleAnnotation =
holeAnnotation as ContourSegmentationAnnotation;
const polyline = convertContourPolylineToCanvasSpace(
contourHoleAnnotation.data.contour.polyline,
viewport
);
return { annotation: contourHoleAnnotation, polyline };
});
}
/**
* Helper function to create a hole in a target annotation.
*/
function createPolylineHole(
viewport: Types.IViewport,
targetAnnotation: ContourSegmentationAnnotation,
holeAnnotation: ContourSegmentationAnnotation
): void {
addChildAnnotation(targetAnnotation, holeAnnotation);
removeContourSegmentationAnnotation(holeAnnotation);
const { contour: holeContour } = holeAnnotation.data;
const holePolylineCanvas = convertContourPolylineToCanvasSpace(
holeContour.polyline,
viewport
);
updateContourPolyline(
holeAnnotation,
{
points: holePolylineCanvas,
closed: holeContour.closed,
targetWindingDirection:
targetAnnotation.data.contour.windingDirection ===
ContourWindingDirection.Clockwise
? ContourWindingDirection.CounterClockwise
: ContourWindingDirection.Clockwise,
},
viewport
);
}
/**
* Converts a 3D polyline to 2D canvas space.
*/
function convertContourPolylineToCanvasSpace(
polyline: Types.Point3[],
viewport: Types.IViewport
): Types.Point2[] {
const numPoints = polyline.length;
const projectedPolyline = new Array(numPoints);
for (let i = 0; i < numPoints; i++) {
projectedPolyline[i] = viewport.worldToCanvas(polyline[i]);
}
return projectedPolyline;
}
/**
* Updates viewports for multiple annotations.
*/
function updateViewportsForAnnotations(
viewport: Types.IViewport,
annotations: ContourSegmentationAnnotation[]
): void {
const { element } = viewport;
const updatedToolNames = new Set([DEFAULT_CONTOUR_SEG_TOOL_NAME]);
annotations.forEach((annotation) => {
updatedToolNames.add(annotation.metadata.toolName);
});
for (const toolName of updatedToolNames.values()) {
if (hasToolByName(toolName)) {
const viewportIdsToRender = getViewportIdsWithToolToRender(
element,
toolName
);
triggerAnnotationRenderForViewportIds(viewportIdsToRender);
}
}
}
export { processMultipleIntersections };
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