Collision Box check

// Funcion CheckRectCollision();
bool CheckRectCollision(s32 xa1, s32 ya1, s32 xb1, s32 yb1, s32 xa2, s32 ya2, s32 xb2, s32 yb2) {

    // Calcula anchos
    s32 width1 = (xa1 - xb1);
    if (width1 < 0) width1 = -width1;
    s32 width2 = (xa2 - xb2);
    if (width2 < 0) width2 = -width2;

    // Calcula alturas
    s32 height1 = (ya1 - yb1);
    if (height1 < 0) height1 = -height1;
    s32 height2 = (ya2 - yb2);
    if (height2 < 0) height2 = -height2;

    // Variables para el calculo
    s32 small_xa, small_xb, small_ya, small_yb;
    s32 big_xa, big_xb, big_ya, big_yb;

    // Asigna anchos
    if (width1 >= width2) {
        big_xa = xa1, big_xb = xb1;
        small_xa = xa2, small_xb = xb2;
    } else {
        big_xa = xa2, big_xb = xb2;
        small_xa = xa1, small_xb = xb1;
    }

    // Asigna altos
    if (height1 >= height2) {
        big_ya = ya1, big_yb = yb1;
        small_ya = ya2, small_yb = yb2;
    } else {
        big_ya = ya2, big_yb = yb2;
        small_ya = ya1, small_yb = yb1;
    }

    // Verifica si hay colision
    bool collision = false;
    if (
        (
        ((small_xa >= big_xa) && (small_xa <= big_xb))      // Rango horizontal
        ||
        ((small_xb >= big_xa) && (small_xb <= big_xb))
        )
        &&
        (
        ((small_ya >= big_ya) && (small_ya <= big_yb))      // Rango vertical
        ||
        ((small_yb >= big_ya) && (small_yb <= big_yb))
        )
        ) {
        // Si hay colision, devuelve verdadero
        collision = true;
    }

    // Revuelve la colision
    return collision;

}