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

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This commit is contained in:
Mario Zechner 2024-06-11 13:40:24 +02:00
parent 0e78386633
commit f997a5f131
1 changed files with 41 additions and 44 deletions
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59
spine-cpp/spine-cpp/src/spine/SkeletonClipping.cpp
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@ -292,55 +292,52 @@ bool SkeletonClipping::clip(float x1, float y1, float x2, float y2, float x3, fl
input->add(y1);
output->clear();
Vector<float> &clippingVertices = *clippingArea;
size_t clippingVerticesLast = clippingArea->size() - 4;
Vector<float> &clippingVertices = *clippingArea;
for (size_t i = 0;; i += 2) {
float edgeX = clippingVertices[i], edgeY = clippingVertices[i + 1];
float edgeX2 = clippingVertices[i + 2], edgeY2 = clippingVertices[i + 3];
float deltaX = edgeX - edgeX2, deltaY = edgeY - edgeY2;
float ex = edgeX - clippingVertices[i + 2], ey = edgeY - clippingVertices[i + 3];
size_t outputStart = output->size();
Vector<float> &inputVertices = *input;
size_t inputVerticesLength = input->size() - 2, outputStart = output->size();
for (size_t ii = 0; ii < inputVerticesLength; ii += 2) {
for (size_t ii = 0, nn = input->size() - 2; ii < nn;) {
float inputX = inputVertices[ii], inputY = inputVertices[ii + 1];
float inputX2 = inputVertices[ii + 2], inputY2 = inputVertices[ii + 3];
bool side2 = deltaX * (inputY2 - edgeY2) - deltaY * (inputX2 - edgeX2) > 0;
if (deltaX * (inputY - edgeY2) - deltaY * (inputX - edgeX2) > 0) {
if (side2) {
// v1 inside, v2 inside
ii += 2;
float inputX2 = inputVertices[ii], inputY2 = inputVertices[ii + 1];
float s2 = ey * (edgeX - inputX2) > ex * (edgeY - inputY2);
float s1 = ey * (edgeX - inputX) - ex * (edgeY - inputY);
if (s1 > 0) {
if (s2) { // v1 inside, v2 inside
output->add(inputX2);
output->add(inputY2);
continue;
}
// v1 inside, v2 outside
float c0 = inputY2 - inputY, c2 = inputX2 - inputX;
float s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
if (MathUtil::abs(s) > 0.000001f) {
float ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / s;
output->add(edgeX + (edgeX2 - edgeX) * ua);
output->add(edgeY + (edgeY2 - edgeY) * ua);
float ix = inputX2 - inputX, iy = inputY2 - inputY, t = s1 / (ix * ey - iy * ex);
if (t >= 0 && t <= 1) {
output->add(inputX + ix * t);
output->add(inputY + iy * t);
} else {
output->add(edgeX);
output->add(edgeY);
}
} else if (side2) {
// v1 outside, v2 inside
float c0 = inputY2 - inputY, c2 = inputX2 - inputX;
float s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
if (MathUtil::abs(s) > 0.000001f) {
float ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / s;
output->add(edgeX + (edgeX2 - edgeX) * ua);
output->add(edgeY + (edgeY2 - edgeY) * ua);
} else {
output->add(edgeX);
output->add(edgeY);
}
output->add(inputX2);
output->add(inputY2);
}
} else if (s2) { // v1 outside, v2 inside
float ix = inputX2 - inputX, iy = inputY2 - inputY, t = s1 / (ix * ey - iy * ex);
if (t >= 0 && t <= 1) {
output->add(inputX + ix * t);
output->add(inputY + iy * t);
output->add(inputX2);
output->add(inputY2);
} else {
output->add(inputX2);
output->add(inputY2);
continue;
}
}
clipped = true;
}
if (outputStart == output->size()) {
// All edges outside.
originalOutput->clear();