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/*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <element.h>
int update_GEL(UPDATE_FUNC_ARGS) {
int r, rx, ry;
float dx, dy;
char gel;
if (parts[i].tmp>100) parts[i].tmp = 100;
if (parts[i].tmp<0) parts[i].tmp = 0;
for (rx=-2; rx<3; rx++)
for (ry=-2; ry<3; ry++)
if (x+rx>=0 && y+ry>0 && x+rx<XRES && y+ry<YRES && (rx || ry))
{
r = pmap[y+ry][x+rx];
if (!r)
continue;
//Desaturation
if (((r&0xFF)==PT_WATR || (r&0xFF)==PT_DSTW || (r&0xFF)==PT_SLTW || (r&0xFF)==PT_CBNW)
&& parts[i].tmp<100)
{
parts[i].tmp++;
kill_part(r>>8);
}
if ((r&0xFF)==PT_SPNG && parts[i].tmp<100 && ((parts[r>>8].life+1)>parts[i].tmp))
{
parts[r>>8].life--;
parts[i].tmp++;
}
gel = 0;
if ((r&0xFF)==PT_GEL)
gel = 1;
//Concentration diffusion
if (gel && (parts[r>>8].tmp+1)<parts[i].tmp)
{
parts[r>>8].tmp++;
parts[i].tmp--;
}
if ((r&0xFF)==PT_SPNG && (parts[r>>8].life+1)<parts[i].tmp)
{
parts[r>>8].life++;
parts[i].tmp--;
}
dx = parts[i].x - parts[r>>8].x;
dy = parts[i].y - parts[r>>8].y;
//Stickness
if ((dx*dx + dy*dy)>1.5 && (gel || !ptypes[r&0xFF].falldown || (fabs(rx)<2 && fabs(ry)<2)))
{
float per, nd;
nd = dx*dx + dy*dy - 0.5;
per = 5*(1 - parts[i].tmp/100)*(nd/(dx*dx + dy*dy + nd) - 0.5);
if (ptypes[r&0xFF].state==ST_LIQUID)
per *= 0.1;
dx *= per; dy *= per;
parts[i].vx += dx;
parts[i].vy += dy;
if (ptypes[r&0xFF].properties&TYPE_PART || (r&0xFF)==PT_GOO)
{
parts[r>>8].vx -= dx;
parts[r>>8].vy -= dy;
}
}
}
return 0;
}
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