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/* $Id: background.c,v 1.9 2004/08/10 10:43:41 oohara Exp $ */
#include <stdio.h>
#include "tenm_graphic.h"
#include "const.h"
#include "background.h"
static int background_n = 0;
static int background_timer = 0;
void
set_background(int n)
{
background_n = n;
if (n == 0)
background_timer = 0;
else
background_timer = -20;
}
int
clear_window_with_background(void)
{
int red;
int green;
int blue;
int red_base;
int green_base;
int blue_base;
if ((background_n == 0) || (background_timer < -20)
|| (background_timer >= 32))
{
background_timer = 0;
if (tenm_clear_window(tenm_map_color(DEFAULT_BACKGROUND_RED,
DEFAULT_BACKGROUND_GREEN,
DEFAULT_BACKGROUND_BLUE)))
{
fprintf(stderr, "clear_window_with_background: "
"tenm_clear_window failed\n");
return 1;
}
return 0;
}
switch (background_n)
{
/* boss destroyed */
case 1:
red_base = 255;
green_base = 255;
blue_base = 255;
break;
/* boss self-destruction */
case 2:
red_base = 160;
green_base = 160;
blue_base = 255;
break;
/* boss approaching */
case 3:
red_base = 255;
green_base = 160;
blue_base = 160;
break;
default:
fprintf(stderr, "clear_window_with_background: undefined background_n "
"(%d)\n", background_n);
red_base = DEFAULT_BACKGROUND_RED;
green_base = DEFAULT_BACKGROUND_GREEN;
blue_base = DEFAULT_BACKGROUND_BLUE;
break;
}
if (background_timer < 0)
{
red = red_base;
green = green_base;
blue = blue_base;
}
else
{
red = (DEFAULT_BACKGROUND_RED * background_timer
+ red_base * (32 - background_timer)) / 32;
green = (DEFAULT_BACKGROUND_GREEN * background_timer
+ green_base * (32 - background_timer)) / 32;
blue = (DEFAULT_BACKGROUND_BLUE * background_timer
+ blue_base * (32 - background_timer)) / 32;
}
background_timer++;
if (background_timer >= 32)
{
background_n = 0;
background_timer = 0;
}
if (tenm_clear_window(tenm_map_color(red, green, blue)))
{
fprintf(stderr, "clear_window_with_background: "
"tenm_clear_window failed\n");
return 1;
}
return 0;
}
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