69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
#include <gint/display.h>
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#include "vec.h"
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extern inline void vec_cpy(Vec *destination, Vec source) {
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/* memcpy for vectors */
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destination->x = source.x;
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destination->y = source.y;
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}
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extern inline void vec_add(Vec *vector, Vec force) {
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/* addition */
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vector->x += force.x;
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vector->y += force.y;
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}
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extern inline void vec_sub(Vec *vector, Vec force) {
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/* substraction */
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vector->x -= force.x;
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vector->y -= force.y;
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}
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extern inline void vec_mul(Vec *vector, int scale) {
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/* multiplication */
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vector->x *= scale;
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vector->y *= scale;
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}
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extern inline void vec_mulf(Vec *vector, float scale) {
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/* floating point multiplication */
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vector->x *= scale;
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vector->y *= scale;
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}
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extern inline void vec_div(Vec *vector, int scale) {
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/* division */
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vector->x /= scale;
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vector->y /= scale;
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}
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extern inline void vec_divf(Vec *vector, float scale) {
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/* floating point division */
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vector->x /= scale;
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vector->y /= scale;
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}
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extern inline void vec_lerp(Vec *from, Vec to, float scale) {
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/* A linear interpolation function, can be used for camera and
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* animations. 'scale' is the transformation speed, 1 being
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* instant. */
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from->x = from->x * (1 - scale) + to.x * scale;
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from->y = from->y * (1 - scale) + to.y * scale;
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}
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extern inline void vec_clamp(Vec *to_limit, Vec min, Vec max) {
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/* clamp a vector between two points */
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if (to_limit->x < min.x) to_limit->x = min.x;
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if (to_limit->y < min.y) to_limit->y = min.y;
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if (to_limit->x > max.x) to_limit->x = max.x;
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if (to_limit->y > max.y) to_limit->y = max.y;
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}
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extern inline void vec_drect(Vec top_left, Vec bottom_right, int color) {
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/* Draw a rectangle corresponding to two vectors position with
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* given 'color'.
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*/
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drect(top_left.x, top_left.y, bottom_right.x, bottom_right.y, color);
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}
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