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

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This commit is contained in:
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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17
spine-csharp/src/PathConstraint.cs
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@ -71,7 +71,7 @@ namespace Spine {
public void Apply () {
Update();
}
public void Update () {
PathAttachment attachment = target.Attachment as PathAttachment;
if (attachment == null) return;
@ -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,
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 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;
output[o] = x;
output[o + 1] = y;
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 (tangents) {
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));
}
}
}
}