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/*
* Copyright (C) 2021 P. J. McDermott
*
* This file is part of Dodge Balls
*
* Dodge Balls is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Dodge Balls is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Dodge Balls. If not, see <http://www.gnu.org/licenses/>.
*/
#include <SDL.h>
#include "collision.h"
int
db_pt_in_rect(int x, int y, SDL_Rect *rect)
{
if (x < rect->x) {
return 0;
}
if (y < rect->y) {
return 0;
}
if (x > rect->x + rect->w) {
return 0;
}
if (y > rect->y + rect->h) {
return 0;
}
return 1;
}
int
db_col_cir_cir(int x1, int y1, int r1, int x2, int y2, int r2)
{
return ((r1 + r2) * (r1 + r2)) >=
((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
}
/*
* This function will be called after moving the two balls being checked. A
* more accurate way to handle collisions would be to microstep through
* movements to find the exact point of collision.
*/
int
db_col_pt_cir_cir(int x1, int y1, int r1, int x2, int y2, int r2,
int *col_x, int *col_y)
{
if (db_col_cir_cir(x1, y1, r1, x2, y2, r2)) {
*col_x = (x1 + x2) / 2;
*col_y = (y1 + y2) / 2;
return 1;
} else {
return 0;
}
}
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