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[libgdx] Fixed tangents at position 0.

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Calculating the tangent requires more precision than the position.

http://esotericsoftware.com/forum/Glitch-with-the-bones-constrained-to-the-path-10969

Repro:
http://n4te.com/x/173-path-tangent-precision.spine
This commit is contained in:
NathanSweet 2018-10-17 14:52:15 +02:00
parent d0d22bb344
commit 9be30c44cd
1 changed files with 12 additions and 3 deletions
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15
spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PathConstraint.java
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@ -430,14 +430,23 @@ public class PathConstraint implements Constraint {
private void addCurvePosition (float p, float x1, float y1, float cx1, float cy1, float cx2, float cy2, float x2, float y2,
float[] out, int o, boolean tangents) {
if (p < epsilon || Float.isNaN(p)) p = epsilon;
if (p < 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;
out[o] = x;
out[o + 1] = y;
if (tangents)
out[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));
}
}
public int getOrder () {