The-Powder-Toy/src/simulation/elements/SNOW.cpp

#include "simulation/Elements.h"
//#TPT-Directive ElementClass Element_SNOW PT_SNOW 16
Element_SNOW::Element_SNOW()
{
    Identifier = "DEFAULT_PT_SNOW";
    Name = "SNOW";
    Colour = PIXPACK(0xC0E0FF);
    MenuVisible = 1;
    MenuSection = SC_POWDERS;
    Enabled = 1;
    
    Advection = 0.7f;
    AirDrag = 0.01f * CFDS;
    AirLoss = 0.96f;
    Loss = 0.90f;
    Collision = -0.1f;
    Gravity = 0.05f;
    Diffusion = 0.01f;
    HotAir = -0.00005f* CFDS;
    Falldown = 1;
    
    Flammable = 0;
    Explosive = 0;
    Meltable = 0;
    Hardness = 20;
    
    Weight = 50;
    
    Temperature = R_TEMP-30.0f+273.15f;
    HeatConduct = 46;
    Description = "Light particles.";
    
    State = ST_SOLID;
    Properties = TYPE_PART|PROP_LIFE_DEC;
    
    LowPressure = IPL;
    LowPressureTransition = NT;
    HighPressure = IPH;
    HighPressureTransition = NT;
    LowTemperature = ITL;
    LowTemperatureTransition = NT;
    HighTemperature = 273.0f;
    HighTemperatureTransition = ST;
    
    Update = &Element_SNOW::update;
    
}

//#TPT-Directive ElementHeader Element_SNOW static int update(UPDATE_FUNC_ARGS)
int Element_SNOW::update(UPDATE_FUNC_ARGS)
 { //currently used for snow as well
	int r, rx, ry;
	if (parts[i].ctype==PT_FRZW)//get colder if it is from FRZW
	{
		parts[i].temp = restrict_flt(parts[i].temp-1.0f, MIN_TEMP, MAX_TEMP);
	}
	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;
				if (((r&0xFF)==PT_SALT || (r&0xFF)==PT_SLTW) && 1>(rand()%1000))
				{
					sim->part_change_type(i,x,y,PT_SLTW);
					sim->part_change_type(r>>8,x+rx,y+ry,PT_SLTW);
				}
			}
	return 0;
}


Element_SNOW::~Element_SNOW() {}