borgware-2d/games/breakout/rebound.c

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 *
 * Author & Copyright (C) 2010: Soeren Heisrath (forename@surename.org)
 *
 */
#include "rebound.h"

static uint8_t rbpos;

void rebound_reflect (ball_t *b, int8_t in_x)
{
	uint8_t tmpidx;

	tmpidx = ((in_x - rbpos) +1) % (REBOUND_SIZE +2);
	
	b->dir_x += rebound_reflection[tmpidx][0];
	b->dir_y += rebound_reflection[tmpidx][1];
}

uint8_t rebound_getpos ()
{
	return (rbpos + (REBOUND_SIZE / 2));
}

void rebound_init()
{
	rbpos = (NUM_ROWS / 2) - (REBOUND_SIZE / 2);
	rebound_draw();
}

void rebound_draw ()
{
	uint8_t i;

	for (i=0;i<NUM_COLS;i++)
	{
		if (i >= rbpos && i < rbpos + REBOUND_SIZE)
			playfield_set (i, NUM_ROWS-1, rb); /* set rebound pixel */
		else
			playfield_set (i, NUM_ROWS-1, sp); /* space */
	}
//		printf("rpos: %i\n", rbpos);
}

void rebound_tick(ball_t *ball)
{
	if (ball != NULL)
	{
		rbpos = (uint8_t) abs(ball->x / 256);
		if (rbpos > (NUM_COLS - REBOUND_SIZE))
			rbpos = NUM_COLS - REBOUND_SIZE;
		rebound_draw();
	}
	else
	{
		/* directions are inverted (JOYISLEFT means RIGHT) */
		if (JOYISRIGHT && rbpos)
		{
			rbpos--;
			rebound_draw();
		}

		if (JOYISLEFT && rbpos < (NUM_COLS - (REBOUND_SIZE)))
		{
			rbpos++;
			rebound_draw();
		}
	}
}