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

#include "simulation/ElementCommon.h"

static int update(UPDATE_FUNC_ARGS);

void Element::Element_DRAY()
{
	Identifier = "DEFAULT_PT_DRAY";
	Name = "DRAY";
	Colour = 0xFFAA22_rgb;
	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;

	HeatConduct = 0;
	Description = "Duplicator ray. Replicates a line of particles in front of it.";

	Properties = TYPE_SOLID;
	CarriesTypeIn = 1U << FIELD_CTYPE;

	LowPressure = IPL;
	LowPressureTransition = NT;
	HighPressure = IPH;
	HighPressureTransition = NT;
	LowTemperature = ITL;
	LowTemperatureTransition = NT;
	HighTemperature = ITH;
	HighTemperatureTransition = NT;

	Update = &update;
	Graphics = nullptr; // is this needed?
	CtypeDraw = &Element::ctypeDrawVInCtype;
}

//should probably be in Simulation.h
static bool InBounds(int x, int y)
{
	return (x>=0 && y>=0 && x<XRES && y<YRES);
}

static int update(UPDATE_FUNC_ARGS)
{
	int ctype = TYP(parts[i].ctype), ctypeExtra = ID(parts[i].ctype), copyLength = parts[i].tmp, copySpaces = parts[i].tmp2;
	if (copySpaces < 0)
		copySpaces = parts[i].tmp2 = 0;
	if (copyLength < 0)
		copyLength = parts[i].tmp = 0;
	else if (copyLength > 0)
		copySpaces++; //strange hack

	for (int rx = -1; rx <= 1; rx++)
	{
		for (int ry = -1; ry <= 1; ry++)
		{
			if (BOUNDS_CHECK && (rx || ry))
			{
				int r = pmap[y+ry][x+rx];
				if (TYP(r) == PT_SPRK && parts[ID(r)].life == 3) //spark found, start creating
				{
					bool overwrite = parts[ID(r)].ctype == PT_PSCN;
					int partsRemaining = copyLength, xCopyTo = -1, yCopyTo = -1; //positions where the line will start being copied at
					int localCopyLength = copyLength;

					if (parts[ID(r)].ctype == PT_INWR && rx && ry) // INWR doesn't spark from diagonals
						continue;

					//figure out where the copying will start/end
					bool foundParticle = false;
					bool isEnergy = false;
					for (int xStep = rx*-1, yStep = ry*-1, xCurrent = x+xStep, yCurrent = y+yStep; ; xCurrent+=xStep, yCurrent+=yStep)
					{
						// Out of bounds, stop looking and don't copy anything
						if (!sim->InBounds(xCurrent, yCurrent))
							break;
						int rr;
						// haven't found a particle yet, keep looking for one
						// the first particle it sees decides whether it will copy energy particles or not
						if (!foundParticle)
						{
							rr = pmap[yCurrent][xCurrent];
							if (!rr)
							{
								rr = sim->photons[yCurrent][xCurrent];
								if (rr)
									foundParticle = isEnergy = true;
							}
							else
								foundParticle = true;
						}
						// now that it knows what kind of particle it is copying, do some extra stuff here so we can determine when to stop
						if ((ctype && sim->elements[ctype].Properties&TYPE_ENERGY) || isEnergy)
							rr = sim->photons[yCurrent][xCurrent];
						else
							rr = pmap[yCurrent][xCurrent];

						// Checks for when to stop:
						//  1: if .tmp isn't set, and the element in this spot is the ctype, then stop
						//  2: if .tmp is set, stop when the length limit reaches 0
						if ((!localCopyLength && TYP(rr) == ctype && (ctype != PT_LIFE || parts[ID(rr)].ctype == ctypeExtra))
								|| !--partsRemaining)
						{
							localCopyLength -= partsRemaining;
							xCopyTo = xCurrent + xStep*copySpaces;
							yCopyTo = yCurrent + yStep*copySpaces;
							break;
						}
					}

					// now, actually copy the particles
					partsRemaining = localCopyLength + 1;
					int type, p;
					for (int xStep = rx*-1, yStep = ry*-1, xCurrent = x+xStep, yCurrent = y+yStep; InBounds(xCopyTo, yCopyTo) && --partsRemaining; xCurrent+=xStep, yCurrent+=yStep, xCopyTo+=xStep, yCopyTo+=yStep)
					{
						// get particle to copy
						if (isEnergy)
							type = TYP(sim->photons[yCurrent][xCurrent]);
						else
							type = TYP(pmap[yCurrent][xCurrent]);

						// if sparked by PSCN, overwrite whatever is in the target location, instead of just ignoring it
						if (overwrite)
						{
							if (isEnergy)
							{
								if (sim->photons[yCopyTo][xCopyTo])
									sim->kill_part(ID(sim->photons[yCopyTo][xCopyTo]));
							}
							else
							{
								if (pmap[yCopyTo][xCopyTo])
									sim->kill_part(ID(pmap[yCopyTo][xCopyTo]));
							}
						}
						if (type == PT_SPRK) // spark hack
							p = sim->create_part(-1, xCopyTo, yCopyTo, PT_METL);
						else if (type)
							p = sim->create_part(-1, xCopyTo, yCopyTo, type);
						else
							continue;

						// if new particle was created successfully
						if (p >= 0)
						{
							if (type == PT_SPRK) // spark hack
								sim->part_change_type(p, xCopyTo, yCopyTo, PT_SPRK);
							if (isEnergy)
								parts[p] = parts[ID(sim->photons[yCurrent][xCurrent])];
							else
								parts[p] = parts[ID(pmap[yCurrent][xCurrent])];
							parts[p].x = float(xCopyTo);
							parts[p].y = float(yCopyTo);
						}
					}
				}
			}
		}
	}
	return 0;
}