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[csharp] Port of fix for tangents at position 0 in PathConstraint. See #1198.

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badlogic 2018-10-26 17:37:36 +02:00
parent 2cebd72f21
commit 33f5f0d99a
1 changed files with 13 additions and 4 deletions
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15
spine-csharp/src/PathConstraint.cs
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@ -416,14 +416,23 @@ namespace Spine {
static void AddCurvePosition (float p, float x1, float y1, float cx1, float cy1, float cx2, float cy2, float x2, float y2, static void AddCurvePosition (float p, float x1, float y1, float cx1, float cy1, float cx2, float cy2, float x2, float y2,
float[] output, int o, bool tangents) { float[] output, int o, bool tangents) {
if (p < PathConstraint.Epsilon || float.IsNaN(p)) p = PathConstraint.Epsilon; if (p < PathConstraint.Epsilon || float.IsNaN(p)) {
out[o] = x1;
out[o + 1] = y1;
out[o + 2] = (float)Math.Atan2(cy1 - y1, cx1 - x1);
return;
}
float tt = p * p, ttt = tt * p, u = 1 - p, uu = u * u, uuu = uu * u; float tt = p * p, ttt = tt * p, u = 1 - p, uu = u * u, uuu = uu * u;
float ut = u * p, ut3 = ut * 3, uut3 = u * ut3, utt3 = ut3 * p; float ut = u * p, ut3 = ut * 3, uut3 = u * ut3, utt3 = ut3 * p;
float x = x1 * uuu + cx1 * uut3 + cx2 * utt3 + x2 * ttt, y = y1 * uuu + cy1 * uut3 + cy2 * utt3 + y2 * ttt; float x = x1 * uuu + cx1 * uut3 + cx2 * utt3 + x2 * ttt, y = y1 * uuu + cy1 * uut3 + cy2 * utt3 + y2 * ttt;
output[o] = x; output[o] = x;
output[o + 1] = y; output[o + 1] = y;
if (tangents) if (tangents) {
output[o + 2] = (float)Math.Atan2(y - (y1 * uu + cy1 * ut * 2 + cy2 * tt), x - (x1 * uu + cx1 * ut * 2 + cx2 * tt)); if (p < 0.001f)
out[o + 2] = (float)Math.Atan2(cy1 - y1, cx1 - x1);
else
out[o + 2] = (float)Math.Atan2(y - (y1 * uu + cy1 * ut * 2 + cy2 * tt), x - (x1 * uu + cx1 * ut * 2 + cx2 * tt));
}
} }
} }
} }