module_aabb.h

module_aabb.h

/*
   I was testing for the obvious thing: check if 100% there is collision.
   But it's better to check for the opposite: check when there is NO collision.
   (Learned that from tsoding)
*/
#ifndef AABB_H
#define AABB_H

#include "raylib.h"
#include "typedef.h"

bool AABB_has_point(AABB box, Vector2 point) {
    //return 
    //(fabsf(point.x - box.pos.x) < (box.size.x / 2.0f)) &&
    //(fabsf(point.y - box.pos.y) < (box.size.y / 2.0f))
    //;
    float left   = box.pos.x;
    float right  = box.pos.x + box.size.x;
    float top    = box.pos.y;
    float bottom = box.pos.y + box.size.y;
    return ! (
        point.x > right ||
        point.x < left ||
        point.y > bottom ||
        point.y < top
    );
}


bool AABB_simple_collide (AABB lhs, AABB rhs)
{
    //return (
        //(fabs(lhs.pos.x - rhs.pos.x) <= (lhs.size.x + rhs.size.x)/2.f) &&
        //(fabs(lhs.pos.y - rhs.pos.y) <= (lhs.size.y + rhs.size.y)/2.f)
    //);
    float left1   = lhs.pos.x;
    float right1  = lhs.pos.x + lhs.size.x;
    float top1    = lhs.pos.y;
    float bottom1 = lhs.pos.y + lhs.size.y;
    float left2   = rhs.pos.x;
    float right2  = rhs.pos.x + rhs.size.x;
    float top2    = rhs.pos.y;
    float bottom2 = rhs.pos.y + rhs.size.y;
    return ! (
        left1 > right2 || left2 > right1 ||
        top1 > bottom2 || top2 > bottom1
    );
}


#endif // !AABB_H