I'm trying to make a gas clone.

#include "simulation/Elements.h"
//#TPT-Directive ElementClass Element_GCLN PT_GCLN 9
Element_GCLN::Element_GCLN()
{
   Identifier = "DEFAULT_PT_GCLN";
   Name = "GCLN";
   Colour = PIXPACK(0xFFD010);
   MenuVisible = 1;
   MenuSection = SC_GAS;
   Enabled = 1;
   
   Advection = 0.0f;
   AirDrag = 0.00f * CFDS;
   AirLoss = 0.90f;
   Loss = 0.00f;
   Collision = 0.0f;
   Gravity = 0.0f;
   Diffusion = 0.00f;
   HotAir = 0.000f* CFDS;
   Falldown = 0;
   
   Flammable = 0;
   Explosive = 0;
   Meltable = 0;
   Hardness = 1;
   
   Weight = 100;
   
   Temperature = R_TEMP+0.0f+273.15f;
   HeatConduct = 251;
   Description = "Solid. Duplicates any particles it touches.";
   
   State = ST_GAS;
   Properties = TYPE_GAS;
   
   LowPressure = IPL;
   LowPressureTransition = NT;
   HighPressure = IPH;
   HighPressureTransition = NT;
   LowTemperature = ITL;
   LowTemperatureTransition = NT;
   HighTemperature = ITH;
   HighTemperatureTransition = NT;
   
   Update = &Element_GCLN::update;
   
}

//#TPT-Directive ElementHeader Element_GCLN static int update(UPDATE_FUNC_ARGS)
int Element_GCLN::update(UPDATE_FUNC_ARGS)
{
if (parts[i].ctype<=0 || parts[i].ctype>=PT_NUM || !sim->elements[parts[i].ctype].Enabled || (parts[i].ctype==PT_LIFE && (parts[i].tmp<0 || parts[i].tmp>=NGOLALT)))
{
int r, rx, ry;
for (rx=-1; rx<2; rx++)
for (ry=-1; ry<2; ry++)
if (x+rx>=0 && y+ry>=0 && x+rx<XRES && y+ry<YRES)
{
r = sim->photons[y+ry][x+rx];
if (!r)
r = pmap[y+ry][x+rx];
if (!r)
continue;
if ((r&0xFF)!=PT_GCLN && (r&0xFF)!=PT_PCLN &&
       (r&0xFF)!=PT_BCLN && (r&0xFF)!=PT_STKM &&
       (r&0xFF)!=PT_PBCN && (r&0xFF)!=PT_STKM2 &&
       (r&0xFF)<PT_NUM)
{
parts[i].ctype = r&0xFF;
if ((r&0xFF)==PT_LIFE || (r&0xFF)==PT_LAVA)
parts[i].tmp = parts[r>>8].ctype;
}
}
}
else {
if (parts[i].ctype==PT_LIFE) sim->create_part(-1, x+rand()%3-1, y+rand()%3-1, parts[i].ctype|(parts[i].tmp<<8));
else if (parts[i].ctype!=PT_LIGH || (rand()%30)==0)
{
int np = sim->create_part(-1, x+rand()%3-1, y+rand()%3-1, parts[i].ctype);
if (np>=0)
{
if (parts[i].ctype==PT_LAVA && parts[i].tmp>0 && parts[i].tmp<PT_NUM && sim->elements[parts[i].tmp].HighTemperatureTransition==PT_LAVA)
parts[np].ctype = parts[i].tmp;
}
}
}
return 0;
}


Element_GCLN::~Element_GCLN() {}

Okay thanks!