diff options
Diffstat (limited to 'lib')
| -rwxr-xr-x | lib/build.sh | 2 | ||||
| -rw-r--r-- | lib/types.h | 2 | ||||
| -rw-r--r-- | lib/vec2.c | 21 |
3 files changed, 24 insertions, 1 deletions
diff --git a/lib/build.sh b/lib/build.sh index 725c237..f305939 100755 --- a/lib/build.sh +++ b/lib/build.sh @@ -7,7 +7,7 @@ fail() { CC=cc CFLAGS="-std=c99 -Wall -Wextra -Wpedantic -D_POSIX_C_SOURCE=200809L" -LDFLAGS="-fPIC" +LDFLAGS="-fPIC -lm" SOURCES="test.c vec2.c world.c log.c" output="build" diff --git a/lib/types.h b/lib/types.h index 0619c8a..8618df9 100644 --- a/lib/types.h +++ b/lib/types.h @@ -8,3 +8,5 @@ vec2 dp_vec2_add(vec2, vec2); vec2 dp_vec2_sub(vec2, vec2); vec2 dp_vec2_mul(vec2, float scalar); vec2 dp_vec2_dot(vec2, vec2); +float dp_vec2_length(vec2); +vec2 dp_vec2_normal(vec2); @@ -1,9 +1,16 @@ +#include <assert.h> +#include <math.h> + #include "types.h" vec2 dp_vec2_new(float x, float y) { vec2 new; + + assert(isfinite(x)); + assert(isfinite(y)); + new.x = x; new.y = y; return new; @@ -44,3 +51,17 @@ dp_vec2_dot(vec2 a, vec2 b) dot.y = a.y * b.y; return dot; } + +float +dp_vec2_length(vec2 v) +{ + return sqrtf(powf(v.x, 2.f) + powf(v.y, 2.f)); +} + +vec2 +dp_vec2_normal(vec2 v) +{ + float a; + a = 1.f / dp_vec2_length(v); + return dp_vec2_mul(v, a); +} |