public void Update()
{
float rotateMix = this.rotateMix, translateMix = this.translateMix, scaleMix = this.scaleMix, shearMix = this.shearMix;
Bone target = this.target;
float ta = target.a, tb = target.b, tc = target.c, td = target.d;
ExposedList <Bone> bones = this.bones;
for (int i = 0, n = bones.Count; i < n; i++)
{
Bone bone = bones.Items[i];
if (rotateMix > 0)
{
float a = bone.a, b = bone.b, c = bone.c, d = bone.d;
float r = (float)Math.Atan2(tc, ta) - (float)Math.Atan2(c, a) + data.offsetRotation * MathUtils.degRad;
if (r > MathUtils.PI)
{
r -= MathUtils.PI2;
}
else if (r < -MathUtils.PI)
{
r += MathUtils.PI2;
}
r *= rotateMix;
float cos = MathUtils.Cos(r), sin = MathUtils.Sin(r);
bone.a = cos * a - sin * c;
bone.b = cos * b - sin * d;
bone.c = sin * a + cos * c;
bone.d = sin * b + cos * d;
}
if (translateMix > 0)
{
float tempx, tempy;
target.LocalToWorld(data.offsetX, data.offsetY, out tempx, out tempy);
bone.worldX += (tempx - bone.worldX) * translateMix;
bone.worldY += (tempy - bone.worldY) * translateMix;
}
if (scaleMix > 0)
{
float bs = (float)Math.Sqrt(bone.a * bone.a + bone.c * bone.c);
float ts = (float)Math.Sqrt(ta * ta + tc * tc);
float s = bs > 0.00001f ? (bs + (ts - bs + data.offsetScaleX) * scaleMix) / bs : 0;
bone.a *= s;
bone.c *= s;
bs = (float)Math.Sqrt(bone.b * bone.b + bone.d * bone.d);
ts = (float)Math.Sqrt(tb * tb + td * td);
s = bs > 0.00001f ? (bs + (ts - bs + data.offsetScaleY) * scaleMix) / bs : 0;
bone.b *= s;
bone.d *= s;
}
if (shearMix > 0)
{
float b = bone.b, d = bone.d;
float by = MathUtils.Atan2(d, b);
float r = MathUtils.Atan2(td, tb) - MathUtils.Atan2(tc, ta) - (by - MathUtils.Atan2(bone.c, bone.a));
if (r > MathUtils.PI)
{
r -= MathUtils.PI2;
}
else if (r < -MathUtils.PI)
{
r += MathUtils.PI2;
}
r = by + (r + data.offsetShearY * MathUtils.degRad) * shearMix;
float s = (float)Math.Sqrt(b * b + d * d);
bone.b = MathUtils.Cos(r) * s;
bone.d = MathUtils.Sin(r) * s;
}
}
}