From 00ddc1f8be769c75758296e80779aa8ca198860a Mon Sep 17 00:00:00 2001
From: Cracker1000 <39940063+cracker1000@users.noreply.github.com>
Date: Wed, 7 Oct 2020 14:19:31 +0530
Subject: [PATCH] Add VSNS (#707)
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Co-authored-by: Tamás Bálint Misius <lbphacker@gmail.com>
---
 src/simulation/ElementNumbers.h  |   1 +
 src/simulation/elements/VSNS.cpp | 171 +++++++++++++++++++++++++++++++
 2 files changed, 172 insertions(+)
 create mode 100644 src/simulation/elements/VSNS.cpp

diff --git a/src/simulation/ElementNumbers.h b/src/simulation/ElementNumbers.h
index 6c92f23c3..e9f1141bd 100644
--- a/src/simulation/ElementNumbers.h
+++ b/src/simulation/ElementNumbers.h
@@ -197,5 +197,6 @@ ELEMENT_DEFINE(LSNS, 185);
 ELEMENT_DEFINE(LDTC, 186);
 ELEMENT_DEFINE(SLCN, 187);
 ELEMENT_DEFINE(PTNM, 188);
+ELEMENT_DEFINE(VSNS, 189);
 
 #undef ELEMENT_DEFINE
diff --git a/src/simulation/elements/VSNS.cpp b/src/simulation/elements/VSNS.cpp
new file mode 100644
index 000000000..53ac536f2
--- /dev/null
+++ b/src/simulation/elements/VSNS.cpp
@@ -0,0 +1,171 @@
+#include "simulation/ElementCommon.h"
+
+static int update(UPDATE_FUNC_ARGS);
+
+void Element::Element_VSNS()
+{
+	Identifier = "DEFAULT_PT_VSNS";
+	Name = "VSNS";
+	Colour = PIXPACK(0x7C9C00);
+	MenuVisible = 1;
+	MenuSection = SC_SENSOR;
+	Enabled = 1;
+
+	Advection = 0.0f;
+	AirDrag = 0.00f * CFDS;
+	AirLoss = 0.96f;
+	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;
+
+	DefaultProperties.temp = 4.0f + 273.15f;
+	HeatConduct = 0;
+	Description = "Velocity sensor, creates a spark when there's a nearby particle with velocity higher than its temperature.";
+
+	Properties = TYPE_SOLID;
+
+	LowPressure = IPL;
+	LowPressureTransition = NT;
+	HighPressure = IPH;
+	HighPressureTransition = NT;
+	LowTemperature = ITL;
+	LowTemperatureTransition = NT;
+	HighTemperature = ITH;
+	HighTemperatureTransition = NT;
+
+	DefaultProperties.tmp2 = 2;
+
+	Update = &update;
+}
+
+static int update(UPDATE_FUNC_ARGS)
+{
+	int rd = parts[i].tmp2;
+	if (rd > 25) parts[i].tmp2 = rd = 25;
+	if (parts[i].life)
+	{
+		parts[i].life = 0;
+		for (int rx = -2; rx <= 2; rx++)
+			for (int ry = -2; ry <= 2; ry++)
+				if (BOUNDS_CHECK && (rx || ry))
+				{
+					int r = pmap[y + ry][x + rx];
+					if (!r)
+						continue;
+					int rt = TYP(r);
+					if (sim->parts_avg(i, ID(r), PT_INSL) != PT_INSL)
+					{
+						if ((sim->elements[rt].Properties &PROP_CONDUCTS) && !(rt == PT_WATR || rt == PT_SLTW || rt == PT_NTCT || rt == PT_PTCT || rt == PT_INWR) && parts[ID(r)].life == 0)
+						{
+							parts[ID(r)].life = 4;
+							parts[ID(r)].ctype = rt;
+							sim->part_change_type(ID(r), x + rx, y + ry, PT_SPRK);
+						}
+					}
+				}
+	}
+	bool doSerialization = false;
+	bool doDeserialization = false;
+	float Vs = 0;
+	for (int rx = -rd; rx < rd + 1; rx++)
+		for (int ry = -rd; ry < rd + 1; ry++)
+			if (x + rx >= 0 && y + ry >= 0 && x + rx < XRES && y + ry < YRES && (rx || ry))
+			{
+				int r = pmap[y + ry][x + rx];
+				if (!r)
+					r = sim->photons[y + ry][x + rx];
+				if (!r)
+					continue;
+				float Vx = parts[ID(r)].vx;
+				float Vy = parts[ID(r)].vy;
+				float Vm = sqrt(Vx*Vx + Vy*Vy);
+
+				switch (parts[i].tmp)
+				{
+				case 1:
+					// serialization
+					if (TYP(r) != PT_VSNS && TYP(r) != PT_FILT && !(sim->elements[TYP(r)].Properties & TYPE_SOLID))
+					{
+						doSerialization = true;
+						Vs = Vm;
+					}
+					break;
+				case 3:
+					// deserialization
+					if (TYP(r) == PT_FILT)
+					{
+						int vel = parts[ID(r)].ctype - 0x10000000;
+						if (vel >= 0 && vel < SIM_MAXVELOCITY)
+						{
+							doDeserialization = true;
+							Vs = vel;
+						}
+					}
+					break;
+				case 2:
+					// Invert mode
+					if (!(sim->elements[TYP(r)].Properties & TYPE_SOLID) && Vm <= parts[i].temp - 273.15)
+						parts[i].life = 1;
+					break;
+				default:
+					// Normal mode
+					if (!(sim->elements[TYP(r)].Properties & TYPE_SOLID) && Vm > parts[i].temp - 273.15)
+						parts[i].life = 1;
+					break;
+				}
+			}
+
+	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 (!r)
+					r = sim->photons[y + ry][x + rx];
+				if (!r)
+					continue;
+				int nx = x + rx;
+				int ny = y + ry;
+				//Serialization.
+				if (doSerialization)
+				{
+					while (TYP(r) == PT_FILT)
+					{
+						parts[ID(r)].ctype = 0x10000000 + (int)(Vs + 0.5f);
+						nx += rx;
+						ny += ry;
+						if (nx < 0 || ny < 0 || nx >= XRES || ny >= YRES)
+							break;
+						r = pmap[ny][nx];
+					}
+				}
+				//Deserialization.
+				if (doDeserialization)
+				{
+					if (TYP(r) != PT_FILT && !(sim->elements[TYP(r)].Properties & TYPE_SOLID))
+					{
+						float Vx = parts[ID(r)].vx;
+						float Vy = parts[ID(r)].vy;
+						float Vm = sqrt(Vx*Vx + Vy*Vy);
+						if (Vm > 0)
+						{
+							parts[ID(r)].vx *= Vs / Vm;
+							parts[ID(r)].vy *= Vs / Vm;
+						}
+						break;
+					}
+				}
+			}
+
+	return 0;
+}