made all versions get built by default and moved some functions from graphics.c into math.c so the headless does not need graphics.c

1 files changed, 38 insertions, 0 deletions

diff --git a/src/math.c b/src/math.c
new file mode 100644
index 0000000..491d6a3
--- /dev/null
+++ b/src/math.c
@@ -0,0 +1,38 @@
+#include "math.h"
+
+c3_t rotate_c3_xr(c3_t p1,c3_t p2,real xr) {//rotate y and z around camera based on xr (looking up and down)
+  c2_t tmp;
+  tmp=rotate_c2((c2_t){p1.y,p1.z},(c2_t){p2.y,p2.z},xr);
+  return (c3_t){p1.x,tmp.x,tmp.y};
+}
+c3_t rotate_c3_yr(c3_t p1,c3_t p2,real yr) {//rotate x and z around camera based on yr (looking left and right)
+  c2_t tmp;
+  tmp=rotate_c2((c2_t){p1.x,p1.z},(c2_t){p2.x,p2.z},yr);
+  return (c3_t){tmp.x,p1.y,tmp.y};
+}
+c3_t rotate_c3_zr(c3_t p1,c3_t p2,real zr) {//rotate x and y around camera based on zr (cocking your head to a side)
+  c2_t tmp;
+  tmp=rotate_c2((c2_t){p1.x,p1.y},(c2_t){p2.x,p2.y},zr);
+  return (c3_t){tmp.x,tmp.y,p1.z};
+}
+
+c2_t rotate_c2(c2_t p1,c2_t p2,real dr) {//dr is in radians
+  c2_t p3;
+  real d=distance2(p1,p2);
+  real r=points_to_angle(p1,p2);
+  r=r+dr;
+  p3.x=(sinl(r) * d) + p2.x;
+  p3.y=(cosl(r) * d) + p2.y;
+  return p3;
+}
+real distance2(c2_t p1,c2_t p2) {
+ return sqrtl(( (p1.x-p2.x)*(p1.x-p2.x) )+( (p1.y-p2.y)*(p1.y-p2.y) ));
+}
+real d2r(int d) {
+ while(d<0) d+=360;
+ return (real)(d%360) / (real)180 * M_PIl;
+}
+real points_to_angle(c2_t p1,c2_t p2) {
+  real a=atan2l(p2.y-p1.y,p2.x-p1.x);
+  return a>=0?a:M_PIl+M_PIl+a;
+}