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import { getEnabledElement } from '@cornerstonejs/core';
import type { Types } from '@cornerstonejs/core';
import { state } from '../../../store';
import { Events } from '../../../enums';
import {
resetElementCursor,
hideElementCursor,
} from '../../../cursors/elementCursor';
import type { EventTypes } from '../../../types';
import { polyline } from '../../../utilities/math';
import { ContourWindingDirection } from '../../../types/ContourAnnotation';
import type { PlanarFreehandROIAnnotation } from '../../../types/ToolSpecificAnnotationTypes';
import {
getInterpolatedPoints,
shouldSmooth,
} from '../../../utilities/planarFreehandROITool/smoothPoints';
import triggerAnnotationRenderForViewportIds from '../../../utilities/triggerAnnotationRenderForViewportIds';
import updateContourPolyline from '../../../utilities/contours/updateContourPolyline';
import { triggerAnnotationModified } from '../../../stateManagement/annotation/helpers/state';
const { getSubPixelSpacingAndXYDirections, addCanvasPointsToArray, getArea } =
polyline;
/**
* Activates the closed contour edit event loop.
*/
function activateClosedContourEdit(
evt: EventTypes.InteractionEventType,
annotation: PlanarFreehandROIAnnotation,
viewportIdsToRender: string[]
): void {
this.isEditingClosed = true;
const eventDetail = evt.detail;
const { currentPoints, element } = eventDetail;
const canvasPos = currentPoints.canvas;
const enabledElement = getEnabledElement(element);
Iif (!enabledElement) {
// Occurs on shutdown
return;
}
const { viewport } = enabledElement;
const prevCanvasPoints = annotation.data.contour.polyline.map(
viewport.worldToCanvas
);
const { spacing, xDir, yDir } = getSubPixelSpacingAndXYDirections(
viewport,
this.configuration.subPixelResolution
);
this.editData = {
prevCanvasPoints,
editCanvasPoints: [canvasPos],
startCrossingIndex: undefined,
editIndex: 0,
};
this.commonData = {
annotation,
viewportIdsToRender,
spacing,
xDir,
yDir,
movingTextBox: false,
};
state.isInteractingWithTool = true;
element.addEventListener(
Events.MOUSE_UP,
this.mouseUpClosedContourEditCallback
);
element.addEventListener(
Events.MOUSE_DRAG,
this.mouseDragClosedContourEditCallback
);
element.addEventListener(
Events.MOUSE_CLICK,
this.mouseUpClosedContourEditCallback
);
element.addEventListener(
Events.TOUCH_END,
this.mouseUpClosedContourEditCallback
);
element.addEventListener(
Events.TOUCH_DRAG,
this.mouseDragClosedContourEditCallback
);
element.addEventListener(
Events.TOUCH_TAP,
this.mouseUpClosedContourEditCallback
);
hideElementCursor(element);
}
/**
* Dectivates and cleans up the closed contour edit event loop.
*/
function deactivateClosedContourEdit(element: HTMLDivElement): void {
state.isInteractingWithTool = false;
element.removeEventListener(
Events.MOUSE_UP,
this.mouseUpClosedContourEditCallback
);
element.removeEventListener(
Events.MOUSE_DRAG,
this.mouseDragClosedContourEditCallback
);
element.removeEventListener(
Events.MOUSE_CLICK,
this.mouseUpClosedContourEditCallback
);
element.removeEventListener(
Events.TOUCH_END,
this.mouseUpClosedContourEditCallback
);
element.removeEventListener(
Events.TOUCH_DRAG,
this.mouseDragClosedContourEditCallback
);
element.removeEventListener(
Events.TOUCH_TAP,
this.mouseUpClosedContourEditCallback
);
resetElementCursor(element);
}
/**
* Adds points to the edit line and calculates the preview of the edit to render.
* Checks if an edit needs to be completed by crossing of lines, or by editing in
* a way that requires a new edit to keep the contour a simple polygon.
*/
function mouseDragClosedContourEditCallback(
evt: EventTypes.InteractionEventType
): Types.Point2[] {
const eventDetail = evt.detail;
const { currentPoints, element } = eventDetail;
const worldPos = currentPoints.world;
const canvasPos = currentPoints.canvas;
const enabledElement = getEnabledElement(element);
const { renderingEngine, viewport } = enabledElement;
const { viewportIdsToRender, xDir, yDir, spacing } = this.commonData;
const { editIndex, editCanvasPoints, startCrossingIndex } = this.editData;
const lastCanvasPoint = editCanvasPoints[editCanvasPoints.length - 1];
const lastWorldPoint = viewport.canvasToWorld(lastCanvasPoint);
const worldPosDiff = vec3.create();
vec3.subtract(worldPosDiff, worldPos, lastWorldPoint);
const xDist = Math.abs(vec3.dot(worldPosDiff, xDir));
const yDist = Math.abs(vec3.dot(worldPosDiff, yDir));
// Check that we have moved at least one voxel in each direction.
if (xDist <= spacing[0] && yDist <= spacing[1]) {
// Haven't changed world point enough, don't render
return;
}
if (startCrossingIndex !== undefined) {
// Edge case: If the edit line itself crosses, remove part of that edit line so we don't
// Get isolated regions.
this.checkAndRemoveCrossesOnEditLine(evt);
}
const numPointsAdded = addCanvasPointsToArray(
element,
editCanvasPoints,
canvasPos,
this.commonData
);
const currentEditIndex = editIndex + numPointsAdded;
this.editData.editIndex = currentEditIndex;
if (startCrossingIndex === undefined && editCanvasPoints.length > 1) {
// If we haven't found the index of the first crossing yet,
// see if we can find it.
this.checkForFirstCrossing(evt, true);
}
this.editData.snapIndex = this.findSnapIndex();
if (this.editData.snapIndex === -1) {
// No point on the prevCanvasPoints for the editCanvasPoints line to
// snap to. Apply edit, and start a new edit as we've gone back on ourselves.
this.finishEditAndStartNewEdit(evt);
return;
}
this.editData.fusedCanvasPoints = this.fuseEditPointsWithClosedContour(evt);
if (
startCrossingIndex !== undefined &&
this.checkForSecondCrossing(evt, true)
) {
// Crossed a second time, apply edit, and start a new edit from the crossing.
this.removePointsAfterSecondCrossing(true);
this.finishEditAndStartNewEdit(evt);
}
triggerAnnotationRenderForViewportIds(renderingEngine, viewportIdsToRender);
}
/**
* Finish the current edit, and start a new one.
*/
function finishEditAndStartNewEdit(evt: EventTypes.InteractionEventType): void {
const eventDetail = evt.detail;
const { element } = eventDetail;
const enabledElement = getEnabledElement(element);
const { viewport, renderingEngine } = enabledElement;
const { annotation, viewportIdsToRender } = this.commonData;
const { fusedCanvasPoints, editCanvasPoints } = this.editData;
updateContourPolyline(
annotation,
{
points: fusedCanvasPoints,
closed: true,
targetWindingDirection: ContourWindingDirection.Clockwise,
},
viewport
);
// If any manual update, triggered on an annotation, then it will be treated as non-autogenerated.
if (annotation.autoGenerated) {
annotation.autoGenerated = false;
}
triggerAnnotationModified(annotation, element);
const lastEditCanvasPoint = editCanvasPoints.pop();
this.editData = {
prevCanvasPoints: fusedCanvasPoints,
editCanvasPoints: [lastEditCanvasPoint],
startCrossingIndex: undefined,
editIndex: 0,
snapIndex: undefined,
};
triggerAnnotationRenderForViewportIds(renderingEngine, viewportIdsToRender);
}
/**
* This method combines the contour before editing (prevCanvasPoints) with
* the current edit (editCanvasPoints), to produce a renderable preview of the
* edit. Upon finishing the contour, the preview generated here is written back
* into the contour state.
*
* @privateRemarks In this method we combine a few tricks to find the optimal
* contour:
* - As the contour is closed, our edit might stradle the boundary between the
* last and 0th point of the contour, e.g. a small edit might go from e.g. index
* 960 to index 4. We therefore calculate two possible contours, and find the
* one with the biggest area, which will define the actual edit the user desired.
* - As the contour and the edit can be drawn with different chiralities, we find if
* the edit line aligns better with the intended cross points in its current order
* or reversed. We do this by minimising the distance between its ends and the
* intended crossing points.
*/
function fuseEditPointsWithClosedContour(
evt: EventTypes.InteractionEventType
): Types.Point2[] {
const { prevCanvasPoints, editCanvasPoints, startCrossingIndex, snapIndex } =
this.editData;
if (startCrossingIndex === undefined || snapIndex === undefined) {
return;
}
const eventDetail = evt.detail;
const { element } = eventDetail;
// Augment the editCanvasPoints array, between the end of edit and the snap index.
const augmentedEditCanvasPoints = [...editCanvasPoints];
addCanvasPointsToArray(
element,
augmentedEditCanvasPoints,
prevCanvasPoints[snapIndex],
this.commonData
);
if (augmentedEditCanvasPoints.length > editCanvasPoints.length) {
// If any points added, remove the last point, which will be a clone of the snapIndex
augmentedEditCanvasPoints.pop();
}
// Calculate the distances between the first and last edit points and the origin of the
// Contour with the snap point. These will be used to see which way around the edit array should be
// Placed within the preview.
let lowIndex;
let highIndex;
if (startCrossingIndex > snapIndex) {
lowIndex = snapIndex;
highIndex = startCrossingIndex;
} else {
lowIndex = startCrossingIndex;
highIndex = snapIndex;
}
const distanceBetweenLowAndFirstPoint = vec2.distance(
prevCanvasPoints[lowIndex],
augmentedEditCanvasPoints[0]
);
const distanceBetweenLowAndLastPoint = vec2.distance(
prevCanvasPoints[lowIndex],
augmentedEditCanvasPoints[augmentedEditCanvasPoints.length - 1]
);
const distanceBetweenHighAndFirstPoint = vec2.distance(
prevCanvasPoints[highIndex],
augmentedEditCanvasPoints[0]
);
const distanceBetweenHighAndLastPoint = vec2.distance(
prevCanvasPoints[highIndex],
augmentedEditCanvasPoints[augmentedEditCanvasPoints.length - 1]
);
// Generate two possible contours that could be intepreted from the edit:
//
// pointSet1 => 0 -> low -> edit -> high - max.
// pointSet2 => low -> high -> edit
//
// Depending on the placement of the edit and the origin, either of these could be the intended edit.
// We'll choose the one with the largest area, as edits are considered to be changes to the original area with
// A relative change of much less than unity.
// Point Set 1
const pointSet1 = [];
// Add points from the orignal contour origin up to the low index.
for (let i = 0; i < lowIndex; i++) {
const canvasPoint = prevCanvasPoints[i];
pointSet1.push([canvasPoint[0], canvasPoint[1]]);
}
// Check which orientation of the edit line minimizes the distance between the
// origial contour low/high points and the start/end nodes of the edit line.
let inPlaceDistance =
distanceBetweenLowAndFirstPoint + distanceBetweenHighAndLastPoint;
let reverseDistance =
distanceBetweenLowAndLastPoint + distanceBetweenHighAndFirstPoint;
if (inPlaceDistance < reverseDistance) {
for (let i = 0; i < augmentedEditCanvasPoints.length; i++) {
const canvasPoint = augmentedEditCanvasPoints[i];
pointSet1.push([canvasPoint[0], canvasPoint[1]]);
}
} else {
for (let i = augmentedEditCanvasPoints.length - 1; i >= 0; i--) {
const canvasPoint = augmentedEditCanvasPoints[i];
pointSet1.push([canvasPoint[0], canvasPoint[1]]);
}
}
// Add points from the orignal contour's high index up to to its end point.
for (let i = highIndex; i < prevCanvasPoints.length; i++) {
const canvasPoint = prevCanvasPoints[i];
pointSet1.push([canvasPoint[0], canvasPoint[1]]);
}
// Point Set 2
const pointSet2 = [];
for (let i = lowIndex; i < highIndex; i++) {
const canvasPoint = prevCanvasPoints[i];
pointSet2.push([canvasPoint[0], canvasPoint[1]]);
}
inPlaceDistance =
distanceBetweenHighAndFirstPoint + distanceBetweenLowAndLastPoint;
reverseDistance =
distanceBetweenHighAndLastPoint + distanceBetweenLowAndFirstPoint;
if (inPlaceDistance < reverseDistance) {
for (let i = 0; i < augmentedEditCanvasPoints.length; i++) {
const canvasPoint = augmentedEditCanvasPoints[i];
pointSet2.push([canvasPoint[0], canvasPoint[1]]);
}
} else {
for (let i = augmentedEditCanvasPoints.length - 1; i >= 0; i--) {
const canvasPoint = augmentedEditCanvasPoints[i];
pointSet2.push([canvasPoint[0], canvasPoint[1]]);
}
}
const areaPointSet1 = getArea(pointSet1);
const areaPointSet2 = getArea(pointSet2);
const pointsToRender: Types.Point2[] =
areaPointSet1 > areaPointSet2 ? pointSet1 : pointSet2;
return pointsToRender;
}
/**
* Completes the edit of the closed contour when the mouse button is released.
*/
function mouseUpClosedContourEditCallback(
evt: EventTypes.InteractionEventType
): void {
const eventDetail = evt.detail;
const { element } = eventDetail;
this.completeClosedContourEdit(element);
}
/**
* Completes the edit of the closed contour when the mouse button is released.
*/
function completeClosedContourEdit(element: HTMLDivElement) {
const enabledElement = getEnabledElement(element);
const { viewport, renderingEngine } = enabledElement;
const { annotation, viewportIdsToRender } = this.commonData;
const { fusedCanvasPoints, prevCanvasPoints } = this.editData;
Iif (fusedCanvasPoints) {
const updatedPoints = shouldSmooth(this.configuration, annotation)
? getInterpolatedPoints(
this.configuration,
fusedCanvasPoints,
prevCanvasPoints
)
: fusedCanvasPoints;
updateContourPolyline(
annotation,
{
points: updatedPoints,
closed: true,
targetWindingDirection: ContourWindingDirection.Clockwise,
},
viewport
);
// If any manual update, triggered on an annotation, then it will be treated as non-autogenerated.
if (annotation.autoGenerated) {
annotation.autoGenerated = false;
}
triggerAnnotationModified(annotation, element);
}
this.isEditingClosed = false;
this.editData = undefined;
this.commonData = undefined;
triggerAnnotationRenderForViewportIds(renderingEngine, viewportIdsToRender);
this.deactivateClosedContourEdit(element);
}
/**
* Completes the edit on a cancel method call during the closed
* contour edit loop.
*/
function cancelClosedContourEdit(element: HTMLDivElement) {
this.completeClosedContourEdit(element);
}
/**
* Registers the closed contour edit loop to the tool instance.
*/
function registerClosedContourEditLoop(toolInstance): void {
toolInstance.activateClosedContourEdit =
activateClosedContourEdit.bind(toolInstance);
toolInstance.deactivateClosedContourEdit =
deactivateClosedContourEdit.bind(toolInstance);
toolInstance.mouseDragClosedContourEditCallback =
mouseDragClosedContourEditCallback.bind(toolInstance);
toolInstance.mouseUpClosedContourEditCallback =
mouseUpClosedContourEditCallback.bind(toolInstance);
toolInstance.finishEditAndStartNewEdit =
finishEditAndStartNewEdit.bind(toolInstance);
toolInstance.fuseEditPointsWithClosedContour =
fuseEditPointsWithClosedContour.bind(toolInstance);
toolInstance.cancelClosedContourEdit =
cancelClosedContourEdit.bind(toolInstance);
toolInstance.completeClosedContourEdit =
completeClosedContourEdit.bind(toolInstance);
}
export default registerClosedContourEditLoop;
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