src/bz/math/math.c

   1 #include <bz/math/math.h>
   2
   3 #include <math.h>
   4
   5 float bzSine(float a) {
   6         return sinf(bzLerp(0.0f, 2.0f * M_PI, fmodf(a, 1.0f)));
   7 }
   8
   9 float bzCosine(float a) {
  10         return cosf(bzLerp(0.0f, 2.0f * M_PI, fmodf(a, 1.0f)));
  11 }
  12
  13 extern float bzInverseSine(float a) {
  14         return bzUnlerp(0.0f, 2.0f * M_PI, fmodf(asinf(a), 2.0f * M_PI));
  15 }
  16
  17 extern float bzInverseCosine(float a) {
  18         return bzUnlerp(0.0f, 2.0f * M_PI, fmodf(acosf(a), 2.0f * M_PI));
  19 }
  20
  21 float bzSqrt(float a) {
  22         return sqrtf(a);
  23 }
  24
  25 float bzAtan2(float x, float y) {
  26         float a = atan2f(y, x);
  27         float ca = bzUnlerp(0.0f, 2.0f * M_PI, a);
  28         return ca;
  29 }
  30
  31 float bzAngleDelta(float from, float to) {
  32         float delta = fmodf(((to - from) + 2), 1);
  33         if (delta >= 0.5f) {
  34                 delta = -(1.0f - delta);
  35         }
  36         return delta;
  37 }
  38
  39 float bzDistance(float x1, float y1, float x2, float y2) {
  40         return sqrtf(bzDistanceSquared(x1, y1, x2, y2));
  41 }
  42
  43 float bzDistanceSquared(float x1, float y1, float x2, float y2) {
  44         float dx = x2 - x1;
  45         float dy = y2 - y1;
  46         return dx * dx + dy * dy;
  47 }
  48
  49 bool bzDistanceCheck(float x1, float y1, float x2, float y2, float distance) {
  50         return bzDistanceSquared(x1, y1, x2, y2) <= distance * distance;
  51 }