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

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