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/*
* Random little worms.
*
* Copyright (C) 2003, Chris Guirl, David Redick
* Released under the GNU General Public License (v2)
*/
#include <math.h>
#include <stdio.h>
#include "map.h"
/* math.h files do not define M_PI in ansi C */
#ifndef M_PI
#define M_PI 3.14159265358979323846264338327950288
#endif
int filled( int centerx, int centery, int rad, int startdeg, int col, int seg )
{
int deg;
int result = 0;
int check_degrees;
/*
* int seg is the current segment - if this is the first segment of a
* worm (seg = 0) check 360 degrees around it instead of just 180
*/
if( 0 == seg )
check_degrees = 180;
else
check_degrees = 90;
for( deg = startdeg-check_degrees; deg < startdeg+check_degrees; deg += 5 )
{
if( getpixel(map.map, centerx+(rad*cos(M_PI*deg/180)), centery+(rad*sin(M_PI*deg/180))) == col )
{
result = 1;
break;
}
}
return result;
}
void worms()
{
int r, c, segs;
int centerx, centery;
int radius, segments;
int degree, change;
/* 5-15 */
radius = rand()%10+5;
segments = rand()%10+5;
for( r = 0; r < map.num_row; r++ )
{
for( c = 0; c < map.num_col; c++ )
{
rand_point_section_offset(¢erx, ¢ery, r, c, 0);
degree = rand()%360;
for( segs = 0; segs < segments; segs++ )
{
/* -15 to 14 */
change = rand()%30-15;
degree += change;
centerx += radius*cos(M_PI*degree/180);
centery += radius*sin(M_PI*degree/180);
if( filled(centerx, centery, radius+1, degree, 0, segs) == 0 )
{
circlefill(map.map, centerx, centery, radius, 0);
}
else
{
/* encountered another worm, stopping... */
break;
}
}
} /* for(c..) */
} /* for(r..) */
return;
}
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