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[ts] Ported clipping fixes for colinear points (a0caef6 and 932c33a). See #2546..

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This commit is contained in:
Davide Tantillo 2024-06-11 11:06:28 +02:00
parent e973872501
commit 0e78386633
1 changed files with 26 additions and 28 deletions
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54
spine-ts/spine-core/src/SkeletonClipping.ts
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@ -335,49 +335,47 @@ export class SkeletonClipping {
input.push(y1);
output.length = 0;
let clippingVertices = clippingArea;
let clippingVerticesLast = clippingArea.length - 4;
let clippingVertices = clippingArea;
for (let i = 0; ; i += 2) {
let edgeX = clippingVertices[i], edgeY = clippingVertices[i + 1];
let edgeX2 = clippingVertices[i + 2], edgeY2 = clippingVertices[i + 3];
let deltaX = edgeX - edgeX2, deltaY = edgeY - edgeY2;
let ex = edgeX - clippingVertices[i + 2], ey = edgeY - clippingVertices[i + 3];
let outputStart = output.length;
let inputVertices = input;
let inputVerticesLength = input.length - 2, outputStart = output.length;
for (let ii = 0; ii < inputVerticesLength; ii += 2) {
for (let ii = 0, nn = input.length - 2; ii < nn;) {
let inputX = inputVertices[ii], inputY = inputVertices[ii + 1];
let inputX2 = inputVertices[ii + 2], inputY2 = inputVertices[ii + 3];
let side2 = deltaX * (inputY2 - edgeY2) - deltaY * (inputX2 - edgeX2) > 0;
if (deltaX * (inputY - edgeY2) - deltaY * (inputX - edgeX2) > 0) {
if (side2) { // v1 inside, v2 inside
ii += 2;
let inputX2 = inputVertices[ii], inputY2 = inputVertices[ii + 1];
let s2 = ey * (edgeX - inputX2) > ex * (edgeY - inputY2);
let s1 = ey * (edgeX - inputX) - ex * (edgeY - inputY);
if (s1 > 0) {
if (s2) { // v1 inside, v2 inside
output.push(inputX2);
output.push(inputY2);
continue;
}
// v1 inside, v2 outside
let c0 = inputY2 - inputY, c2 = inputX2 - inputX;
let s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
if (Math.abs(s) > 0.000001) {
let ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / s;
output.push(edgeX + (edgeX2 - edgeX) * ua);
output.push(edgeY + (edgeY2 - edgeY) * ua);
let ix = inputX2 - inputX, iy = inputY2 - inputY, t = s1 / (ix * ey - iy * ex);
if (t >= 0 && t <= 1) {
output.push(inputX + ix * t);
output.push(inputY + iy * t);
} else {
output.push(edgeX);
output.push(edgeY);
output.push(inputX2);
output.push(inputY2);
}
} else if (side2) { // v1 outside, v2 inside
let c0 = inputY2 - inputY, c2 = inputX2 - inputX;
let s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
if (Math.abs(s) > 0.000001) {
let ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / s;
output.push(edgeX + (edgeX2 - edgeX) * ua);
output.push(edgeY + (edgeY2 - edgeY) * ua);
} else if (s2) { // v1 outside, v2 inside
let ix = inputX2 - inputX, iy = inputY2 - inputY, t = s1 / (ix * ey - iy * ex);
if (t >= 0 && t <= 1) {
output.push(inputX + ix * t);
output.push(inputY + iy * t);
output.push(inputX2);
output.push(inputY2);
} else {
output.push(edgeX);
output.push(edgeY);
output.push(inputX2);
output.push(inputY2);
continue;
}
output.push(inputX2);
output.push(inputY2);
}
clipped = true;
}