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collide and slide function for FRect

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herbglitch 2023-06-26 01:27:30 -06:00
parent 5aede928d8
commit 56a4aa9d39
2 changed files with 43 additions and 0 deletions
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16
include/arc/math/rectangle.h
View file

@ -3,6 +3,7 @@
#include <stdint.h>
#include "point.h"
#include "vector2.h"
#ifdef __cplusplus
extern "C" {
@ -118,6 +119,21 @@ int32_t ARC_FRect_IntersectsPoint(ARC_FRect *rect, ARC_Point *point);
*/
int32_t ARC_Rect_LineIntersects(ARC_Rect *rect, int32_t *x1, int32_t *y1, int32_t *x2, int32_t *y2);
/**
* @brief checks for a ARC_Rect on ARC_Rect collision and slides on collision
*
* @note need to update this documenation to word it better
*
* @param rect ARC_Rect that might collide with the wall
* @param velocity the ammount ARC_Rect will move
* @param wall ARC_Rect that might have collision with rect
*
* @note velocity is updated based on colliding,
* rect's values are not changed,
* velocity should be applied after
*/
void ARC_FRect_CollideAndSlide(ARC_FRect *rect, ARC_Vector2 *velocity, ARC_FRect *wall);
#ifdef __cplusplus
}
#endif

27
src/math/rectangle.c
View file

@ -69,3 +69,30 @@ int32_t ARC_Rect_LineIntersects(ARC_Rect *rect, int32_t *x1, int32_t *y1, int32_
return 1;
}
//TODO: position 1px away from colliding, so if velocity is greater than 2px it doesn't have weird gap spacing
// might need to check diagnals as well, this is a rudamentry implementation
void ARC_FRect_CollideAndSlide(ARC_FRect *rect, ARC_Vector2 *velocity, ARC_FRect *wall){
ARC_FRect nextRectPosition = {
.x = rect->x + velocity->x,
.y = rect->y + velocity->y,
.w = rect->w,
.h = rect->h
};
//there is no collision, return
if(!ARC_FRect_Intersects(&nextRectPosition, wall)){
return;
}
nextRectPosition.x = rect->x + velocity->x;
nextRectPosition.y = rect->y;
if(ARC_FRect_Intersects(&nextRectPosition, wall)){
velocity->x = 0;
}
nextRectPosition.x = rect->x;
nextRectPosition.y = rect->y + velocity->y;
if(ARC_FRect_Intersects(&nextRectPosition, wall)){
velocity->y = 0;
}
}