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[csharp] Clipping fix, see #1219

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This commit is contained in:
badlogic 2018-12-05 16:30:28 +01:00
parent ea4685be8b
commit c0694bf14b
1 changed files with 21 additions and 9 deletions
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16
spine-csharp/src/SkeletonClipping.cs
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@ -216,15 +216,27 @@ namespace Spine {
}
// v1 inside, v2 outside
float c0 = inputY2 - inputY, c2 = inputX2 - inputX;
float ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / (c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY));
float s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
if (Math.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);
}
}
else if (side2) { // v1 outside, v2 inside
float c0 = inputY2 - inputY, c2 = inputX2 - inputX;
float ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / (c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY));
float s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
if (Math.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);
}