From b32408eff896307741498bee4ec5dacb5b6953ee Mon Sep 17 00:00:00 2001 From: Campbell Barton Date: Mon, 11 Jul 2016 15:28:39 +1000 Subject: BLI_math: move interp_*_cubic to its own function --- source/blender/blenlib/intern/math_vector.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'source/blender/blenlib/intern/math_vector.c') diff --git a/source/blender/blenlib/intern/math_vector.c b/source/blender/blenlib/intern/math_vector.c index 988034349e0..95d5c9fde87 100644 --- a/source/blender/blenlib/intern/math_vector.c +++ b/source/blender/blenlib/intern/math_vector.c @@ -164,6 +164,27 @@ void interp_v2_v2v2_slerp_safe(float target[2], const float a[2], const float b[ } } +/** \name Cubic curve interpolation (bezier spline). + * \{ */ + +void interp_v2_v2v2v2v2_cubic( + float p[2], const float v1[2], const float v2[2], const float v3[2], const float v4[2], + const float u) +{ + float q0[2], q1[2], q2[2], r0[2], r1[2]; + + interp_v2_v2v2(q0, v1, v2, u); + interp_v2_v2v2(q1, v2, v3, u); + interp_v2_v2v2(q2, v3, v4, u); + + interp_v2_v2v2(r0, q0, q1, u); + interp_v2_v2v2(r1, q1, q2, u); + + interp_v2_v2v2(p, r0, r1, u); +} + +/** \} */ + /* weight 3 vectors, * 'w' must be unit length but is not a vector, just 3 weights */ void interp_v3_v3v3v3(float p[3], const float v1[3], const float v2[3], const float v3[3], const float w[3]) -- cgit v1.2.3