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

#include "simulation/Elements.h"
//#TPT-Directive ElementClass Element_PSTN PT_PSTN 168
Element_PSTN::Element_PSTN()
{
    Identifier = "DEFAULT_PT_PSTN";
    Name = "PSTN";
    Colour = PIXPACK(0xBBFF00);
    MenuVisible = 1;
    MenuSection = SC_ELEC;
    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 = 0;
    Description = "Piston, extends and pushes particles";
    
    State = ST_SOLID;
    Properties = TYPE_SOLID|PROP_LIFE_DEC;
    
    LowPressure = IPL;
    LowPressureTransition = NT;
    HighPressure = IPH;
    HighPressureTransition = NT;
    LowTemperature = ITL;
    LowTemperatureTransition = NT;
    HighTemperature = ITH;
    HighTemperatureTransition = NT;
    
    Update = &Element_PSTN::update;
    Graphics = &Element_PSTN::graphics;
    
}

//#TPT-Directive ElementHeader Element_PSTN static int tempParts[128];
int Element_PSTN::tempParts[128];


//#TPT-Directive ElementHeader Element_PSTN static int update(UPDATE_FUNC_ARGS)
int Element_PSTN::update(UPDATE_FUNC_ARGS)
 {
 	int maxSize = parts[i].tmp ? parts[i].tmp : 15;
 	int currentSize = parts[i].tmp2&0xFF;
 	int currentDirection = (parts[i].tmp2>>8)&0xFF;
 	int state = parts[i].ctype;
	int r, nxx, nyy, docontinue, nxi, nyi, rx, ry, nr, ry1, rx1;
	if (parts[i].life==0 && !state) {
		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 && (rx || ry) && (!rx || !ry))
				{
					r = pmap[y+ry][x+rx];
					if (!r)
						continue;
					if ((r&0xFF)==PT_SPRK && parts[r>>8].life==3) {
						bool foundEnd = false;
						int pistonEndX, pistonEndY;
						int pistonCount = 1;
						int newSpace = 0;
						for (nxx = 0, nyy = 0, nxi = rx*-1, nyi = ry*-1; pistonCount < maxSize; nyy+=nyi, nxx+=nxi) {
							if (!(x+nxi+nxx<XRES && y+nyi+nyy<YRES && x+nxi+nxx >= 0 && y+nyi+nyy >= 0)) {
								break;
							}
							r = pmap[y+nyi+nyy][x+nxi+nxx];
							if((r&0xFF)==PT_PSTN) {
								if(!parts[r>>8].ctype)
									pistonCount++;
							} else {
								pistonEndX = x+nxi+nxx;
								pistonEndY = y+nyi+nyy;
								foundEnd = true;
								break;
							}
						}
						if(foundEnd) {
							newSpace = MoveStack(sim, pistonEndX, pistonEndY, nxi, nyi, maxSize, pistonCount, false);
							if(newSpace) {
								//Create new piston section
								for(int j = 0; j < newSpace; j++) {
									int nr = sim->create_part(-3, pistonEndX+(nxi*j), pistonEndY+(nyi*j), PT_PSTN);
									if (nr!=-1) {
										parts[nr].ctype = 1;
									}
								}
							}
						}

					}
				}
	}
	return 0;
}

//#TPT-Directive ElementHeader Element_PSTN static int MoveStack(Simulation * sim, int stackX, int stackY, int directionX, int directionY, int size, int amount, bool retract)
int Element_PSTN::MoveStack(Simulation * sim, int stackX, int stackY, int directionX, int directionY, int size, int amount, bool retract)
{
	bool foundEnd = false, foundParts = false;
	int posX, posY, r, spaces = 0, currentPos = 0;
	for(posX = stackX, posY = stackY; currentPos < size; posX += directionX, posY += directionY)
	{
		if (!(posX < XRES && posY < YRES && posX >= 0 && posY >= 0)) {
			break;
		}
		r = sim->pmap[posY][posX];
		if(!r) {
			spaces++;
			foundEnd = true;
			if(spaces >= amount)
				break;
		} else {
			foundParts = true;
			tempParts[currentPos++] = r>>8;
		}
	}
	if(amount > spaces)
		amount = spaces;
	if(foundParts && foundEnd) {
		//Move particles
		for(int j = 0; j < currentPos; j++) {
			int jP = tempParts[j];
			sim->parts[jP].x += (float)(directionX*amount);
			sim->parts[jP].y += (float)(directionY*amount);
			int nPx = (int)(sim->parts[jP].x + 0.5f);
			int nPy = (int)(sim->parts[jP].y + 0.5f);
			sim->pmap[nPy][nPx] = sim->parts[jP].type|(jP<<8);
		}
		return amount;
	}
	if(!foundParts && foundEnd)
		return amount;
	return 0;
}


//#TPT-Directive ElementHeader Element_PSTN static int graphics(GRAPHICS_FUNC_ARGS)
int Element_PSTN::graphics(GRAPHICS_FUNC_ARGS)
{
	if(cpart->ctype)
	{
		*colr -= 60;
		*colg -= 60;
	}
	return 0;
}

Element_PSTN::~Element_PSTN() {}