Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 | 1x 8x 8x 8x 8x 8x 8x | import { Types } from '@cornerstonejs/core';
import { vec2 } from 'gl-matrix';
import { polyline } from '../../../utilities/math';
import { EventTypes } from '../../../types';
const { addCanvasPointsToArray, getFirstLineSegmentIntersectionIndexes } =
polyline;
/**
* Check if the `editCanvasPoints` have crossed the `prevCanvasPoints` during
* an edit.
*
* @privateRemarks The following tricks are required to make the UX smooth and
* the editing not very picky on exactly where you click:
* - If we don't cross after 2 points, but projecting the line backwards the
* proximity distance means we cross, extend the line back.
* - If we travel the full proximity in canvas points but don't cross a line, we
* are likely drawing along the line, which is intuitive to the user. At this point
* snap the start of the edit to the closest place on the `prevCanvasPoints`,
* so that the edit can be executed in-line.
*/
function checkForFirstCrossing(
evt: EventTypes.InteractionEventType,
isClosedContour: boolean
): void {
const eventDetail = evt.detail;
const { element, currentPoints, lastPoints } = eventDetail;
const canvasPos = currentPoints.canvas;
const lastCanvasPoint = lastPoints.canvas;
const { editCanvasPoints, prevCanvasPoints } = this.editData;
const crossedLineSegment = getFirstLineSegmentIntersectionIndexes(
prevCanvasPoints,
canvasPos,
lastCanvasPoint,
isClosedContour
);
if (crossedLineSegment) {
this.editData.startCrossingIndex = crossedLineSegment[0];
// On the first crossing, remove the first lines prior to the crossing
this.removePointsUpUntilFirstCrossing(isClosedContour);
// prevent continue if there are not the minimum of points for this op.
} else if (prevCanvasPoints.length >= 2) {
if (
editCanvasPoints.length >
this.configuration.checkCanvasEditFallbackProximity
) {
// At this point, likely we are drawing along the line, we are past the proximity for grabbing.
// Search for nearest line segment to the start of the edit.
// Set the crossing index to the lower index of the segment.
const firstEditCanvasPoint = editCanvasPoints[0];
const distanceIndexPairs = [];
for (let i = 0; i < prevCanvasPoints.length; i++) {
const prevCanvasPoint = prevCanvasPoints[i];
const distance = vec2.distance(prevCanvasPoint, firstEditCanvasPoint);
distanceIndexPairs.push({ distance, index: i });
}
distanceIndexPairs.sort((a, b) => a.distance - b.distance);
const twoClosestDistanceIndexPairs = [
distanceIndexPairs[0],
distanceIndexPairs[1],
];
const lowestIndex = Math.min(
twoClosestDistanceIndexPairs[0].index,
twoClosestDistanceIndexPairs[1].index
);
this.editData.startCrossingIndex = lowestIndex;
} else {
// Check if extending a line back 6 (Proximity) canvas pixels would cross a line.
// Extend point back 6 canvas pixels from first point.
const dir = vec2.create();
vec2.subtract(dir, editCanvasPoints[1], editCanvasPoints[0]);
vec2.normalize(dir, dir);
const proximity = 6;
const extendedPoint: Types.Point2 = [
editCanvasPoints[0][0] - dir[0] * proximity,
editCanvasPoints[0][1] - dir[1] * proximity,
];
const crossedLineSegmentFromExtendedPoint =
getFirstLineSegmentIntersectionIndexes(
prevCanvasPoints,
extendedPoint,
editCanvasPoints[0],
isClosedContour
);
if (crossedLineSegmentFromExtendedPoint) {
// Add points.
const pointsToPrepend = [extendedPoint];
addCanvasPointsToArray(
element,
pointsToPrepend,
editCanvasPoints[0],
this.commonData
);
editCanvasPoints.unshift(...pointsToPrepend);
this.removePointsUpUntilFirstCrossing(isClosedContour);
this.editData.editIndex = editCanvasPoints.length - 1;
this.editData.startCrossingIndex =
crossedLineSegmentFromExtendedPoint[0];
}
}
}
}
/**
* Removes the points from the `editCanvasPoints` up until the first crossing of
* the `prevCanvasPoints`. This is so we can just insert this line segment
* into the contour.
*/
function removePointsUpUntilFirstCrossing(isClosedContour: boolean): void {
const { editCanvasPoints, prevCanvasPoints } = this.editData;
let numPointsToRemove = 0;
for (let i = 0; i < editCanvasPoints.length - 1; i++) {
const firstLine = [editCanvasPoints[i], editCanvasPoints[i + 1]];
const didCrossLine = !!getFirstLineSegmentIntersectionIndexes(
prevCanvasPoints,
firstLine[0],
firstLine[1],
isClosedContour
);
// Remove last element
numPointsToRemove++;
if (didCrossLine) {
break;
}
}
// Remove the points
editCanvasPoints.splice(0, numPointsToRemove);
this.editData.editIndex = editCanvasPoints.length - 1;
}
/**
* Returns `true` if the `editCanvasPoints` crosses the `prevCanvasPoints` a
* second time.
*/
function checkForSecondCrossing(
evt: EventTypes.InteractionEventType,
isClosedContour: boolean
): boolean {
const eventDetail = evt.detail;
const { currentPoints, lastPoints } = eventDetail;
const canvasPos = currentPoints.canvas;
const lastCanvasPoint = lastPoints.canvas;
const { prevCanvasPoints } = this.editData;
// Note this method is looking for the first corssing found of
// *the lines given* to it. The parameters given to it are specified to search
// for the second crossing of the prevCanvasPoints, by checking if the last
// mouse drag crossed these. This class method is only called if the edit loop
// has already has a crossing earlier in the edit.
const crossedLineSegment = getFirstLineSegmentIntersectionIndexes(
prevCanvasPoints,
canvasPos,
lastCanvasPoint,
isClosedContour
);
if (!crossedLineSegment) {
return false;
}
return true;
}
/**
* Removes the points from the `editCanvasPoints` after the second crossing of
* the `prevCanvasPoints`. This is so we can just insert this line segment
* into the contour.
*/
function removePointsAfterSecondCrossing(isClosedContour: boolean): void {
const { prevCanvasPoints, editCanvasPoints } = this.editData;
// Remove points after the crossing
for (let i = editCanvasPoints.length - 1; i > 0; i--) {
const lastLine = [editCanvasPoints[i], editCanvasPoints[i - 1]];
const didCrossLine = !!getFirstLineSegmentIntersectionIndexes(
prevCanvasPoints,
lastLine[0],
lastLine[1],
isClosedContour
);
// Remove last element
editCanvasPoints.pop();
if (didCrossLine) {
break;
}
}
}
/**
* During an edit, finds the index on the `prevCanvasPoints` that the
* `editCanvasPoints` should snap to to create one continuous contour.
*
* Returns the index, but returns -1 if there is no index on the
* `prevCanvasPoints` that can be snapped to with causing a crossing of the
* `editCanvasPoints`.
*/
function findSnapIndex(): number {
const { editCanvasPoints, prevCanvasPoints, startCrossingIndex } =
this.editData;
if (
startCrossingIndex === undefined // Haven't crossed line yet
) {
return;
}
const lastEditCanvasPoint = editCanvasPoints[editCanvasPoints.length - 1];
const distanceIndexPairs = [];
for (let i = 0; i < prevCanvasPoints.length; i++) {
const prevCanvasPoint = prevCanvasPoints[i];
const distance = vec2.distance(prevCanvasPoint, lastEditCanvasPoint);
distanceIndexPairs.push({ distance, index: i });
}
distanceIndexPairs.sort((a, b) => a.distance - b.distance);
// Search through from shortest distance and check which snap line doesn't
// Cross the edit line, in most cases the snap index will just be the first one.
const editCanvasPointsLessLastOne = editCanvasPoints.slice(0, -1);
for (let i = 0; i < distanceIndexPairs.length; i++) {
const { index } = distanceIndexPairs[i];
const snapCanvasPosition = prevCanvasPoints[index];
const lastEditCanvasPoint = editCanvasPoints[editCanvasPoints.length - 1];
const crossedLineSegment = getFirstLineSegmentIntersectionIndexes(
editCanvasPointsLessLastOne,
snapCanvasPosition,
lastEditCanvasPoint,
false // The edit line is not a closed contour
);
if (!crossedLineSegment) {
return index;
}
}
// If all of the lines caused a crossing, this means we should start a new edit.
// Use -1 to signify this.
return -1;
}
/**
* Checks if the `editCanvasPoints` cross themselves. If they do, remove the
* region after the cross index, these removes isolated "island" loops that the
* user can draw which make closed contours no longer simple polygons, or open
* contours twisted.
*/
function checkAndRemoveCrossesOnEditLine(
evt: EventTypes.InteractionEventType
): number | undefined {
const eventDetail = evt.detail;
const { currentPoints, lastPoints } = eventDetail;
const canvasPos = currentPoints.canvas;
const lastCanvasPoint = lastPoints.canvas;
const { editCanvasPoints } = this.editData;
const editCanvasPointsLessLastOne = editCanvasPoints.slice(0, -2);
const crossedLineSegment = getFirstLineSegmentIntersectionIndexes(
editCanvasPointsLessLastOne,
canvasPos,
lastCanvasPoint,
false
);
if (!crossedLineSegment) {
return;
}
// We have found a crossing, remove points after the crossing, cutting off
// the "island" loop drawn.
const editIndexCrossed = crossedLineSegment[0];
const numPointsToRemove = editCanvasPoints.length - editIndexCrossed;
for (let i = 0; i < numPointsToRemove; i++) {
editCanvasPoints.pop();
}
}
/**
* Registers the contour drawing loop to the tool instance.
*/
function registerEditLoopCommon(toolInstance) {
toolInstance.checkForFirstCrossing = checkForFirstCrossing.bind(toolInstance);
toolInstance.removePointsUpUntilFirstCrossing =
removePointsUpUntilFirstCrossing.bind(toolInstance);
toolInstance.checkForSecondCrossing =
checkForSecondCrossing.bind(toolInstance);
toolInstance.findSnapIndex = findSnapIndex.bind(toolInstance);
toolInstance.removePointsAfterSecondCrossing =
removePointsAfterSecondCrossing.bind(toolInstance);
toolInstance.checkAndRemoveCrossesOnEditLine =
checkAndRemoveCrossesOnEditLine.bind(toolInstance);
}
export default registerEditLoopCommon;
|