forked from kdx/jtmm2-old
77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
#include <gint/display.h>
|
|
|
|
#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);
|
|
/* from * (1 - scale) */
|
|
vec_mulf(from, 1 - scale);
|
|
/* temp * scale */
|
|
vec_mulf(&temp, scale);
|
|
/* add */
|
|
vec_add(from, temp);
|
|
}
|
|
|
|
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;
|
|
if (to_limit->y > max.y) to_limit->y = max.y;
|
|
}
|
|
|
|
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);
|
|
}
|