forked from kdx/jtmm2-old
More comments in vec.c
This commit is contained in:
parent
190368b666
commit
69a22c0020
15
src/vec.c
15
src/vec.c
|
@ -3,41 +3,52 @@
|
|||
#include "vec.h"
|
||||
|
||||
void vec_cpy(Vec *destination, Vec source) {
|
||||
/* memcpy for vectors */
|
||||
destination->x = source.x;
|
||||
destination->y = source.y;
|
||||
}
|
||||
|
||||
void vec_add(Vec *vector, Vec force) {
|
||||
/* addition */
|
||||
vector->x += force.x;
|
||||
vector->y += force.y;
|
||||
}
|
||||
|
||||
void vec_sub(Vec *vector, Vec force) {
|
||||
/* substraction */
|
||||
vector->x -= force.x;
|
||||
vector->y -= force.y;
|
||||
}
|
||||
|
||||
void vec_mul(Vec *vector, int scale) {
|
||||
/* multiplication */
|
||||
vector->x *= scale;
|
||||
vector->y *= scale;
|
||||
}
|
||||
|
||||
void vec_mulf(Vec *vector, float scale) {
|
||||
/* floating point multiplication */
|
||||
vector->x *= scale;
|
||||
vector->y *= scale;
|
||||
}
|
||||
|
||||
void vec_div(Vec *vector, int scale) {
|
||||
/* division */
|
||||
vector->x /= scale;
|
||||
vector->y /= scale;
|
||||
}
|
||||
|
||||
void vec_divf(Vec *vector, float scale) {
|
||||
/* floating point division */
|
||||
vector->x /= scale;
|
||||
vector->y /= scale;
|
||||
}
|
||||
|
||||
void vec_lerp(Vec *from, Vec to, float scale) {
|
||||
/* A linear interpolation function, can be used for camera and
|
||||
* animations. 'scale' is the transformation speed, 1 being
|
||||
* instant.
|
||||
*/
|
||||
/* from * (1 - scale) + temp * scale */
|
||||
Vec temp;
|
||||
vec_cpy(&temp, to);
|
||||
|
@ -50,6 +61,7 @@ void vec_lerp(Vec *from, Vec to, float scale) {
|
|||
}
|
||||
|
||||
void vec_clamp(Vec *to_limit, Vec min, Vec max) {
|
||||
/* clamp a vector between two points */
|
||||
if (to_limit->x < min.x) to_limit->x = min.x;
|
||||
if (to_limit->y < min.y) to_limit->y = min.y;
|
||||
if (to_limit->x > max.x) to_limit->x = max.x;
|
||||
|
@ -57,5 +69,8 @@ void vec_clamp(Vec *to_limit, Vec min, Vec max) {
|
|||
}
|
||||
|
||||
void vec_drect(Vec top_left, Vec bottom_right, int color) {
|
||||
/* Draw a rectangle corresponding to two vectors position with
|
||||
* given 'color'.
|
||||
*/
|
||||
drect(top_left.x, top_left.y, bottom_right.x, bottom_right.y, color);
|
||||
}
|
||||
|
|
Loading…
Reference in New Issue