luboslenco
73 lines
1.0 KiB
C
73 lines
1.0 KiB
C
#include "iron_vec2.h"
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#include <math.h>
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#include <iron_math.h>
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vec2_t vec2_create(float x, float y) {
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vec2_t v;
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v.x = x;
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v.y = y;
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return v;
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}
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float vec2_len(vec2_t v) {
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return sqrtf(v.x * v.x + v.y * v.y);
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}
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vec2_t vec2_set_len(vec2_t v, float length) {
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float current_length = vec2_len(v);
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if (current_length == 0) {
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return v;
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}
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float mul = length / current_length;
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v.x *= mul;
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v.y *= mul;
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return v;
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}
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vec2_t vec2_mult(vec2_t v, float f) {
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v.x *= f;
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v.y *= f;
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return v;
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}
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vec2_t vec2_add(vec2_t a, vec2_t b) {
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a.x += b.x;
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a.y += b.y;
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return a;
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}
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vec2_t vec2_sub(vec2_t a, vec2_t b) {
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a.x -= b.x;
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a.y -= b.y;
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return a;
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}
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float vec2_cross(vec2_t a, vec2_t b) {
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return a.x * b.y - a.y * b.x;
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}
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vec2_t vec2_norm(vec2_t v) {
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float n = vec2_len(v);
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if (n > 0.0) {
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float inv_n = 1.0f / n;
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v.x *= inv_n;
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v.y *= inv_n;
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}
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return v;
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}
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float vec2_dot(vec2_t a, vec2_t b) {
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return a.x * b.x + a.y * b.y;
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}
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vec2_t vec2_nan() {
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vec2_t v;
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v.x = NAN;
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return v;
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}
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bool vec2_isnan(vec2_t v) {
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return isnan(v.x);
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}
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