Added gel - a liquid with variable heat conductivity and viscosity.

2 files changed, 60 insertions, 0 deletions

diff --git a/src/elements/gel.c b/src/elements/gel.c
new file mode 100644
index 0000000..af10d7c
--- /dev/null
+++ b/src/elements/gel.c
@@ -0,0 +1,52 @@
+#include <element.h>
+
+int update_GEL(UPDATE_FUNC_ARGS) {
+	int r, rx, ry;
+	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;
+
+				//Desaturation
+				if (((r&0xFF)==PT_WATR || (r&0xFF)==PT_DSTW || (r&0xFF)==PT_SLTW || (r&0xFF)==PT_CBNW)
+				    && parts[i].tmp<100)
+				{
+					parts[i].tmp = (100+parts[i].tmp)/2;
+					kill_part(r>>8);
+				}
+
+				char gel = 0;
+				if ((r&0xFF)==PT_GEL)
+					gel = 1;
+
+				//Concentration diffusion
+				if (gel && (parts[r>>8].tmp+1)<parts[i].tmp)
+				{
+					parts[r>>8].tmp++;
+					parts[i].tmp--;
+				}
+
+				float dx, dy;
+				dx = parts[i].x - parts[r>>8].x;
+				dy = parts[i].y - parts[r>>8].y;
+
+				//Stickness
+				if ((dx*dx + dy*dy)>1.5 && (gel || !ptypes[r&0xFF].falldown || (fabs(rx)<2 && fabs(ry)<2)))
+				{
+					float per, nd;
+					nd = dx*dx + dy*dy - 0.5;
+
+					per = 5*(1 - parts[i].tmp/100)*(nd/(dx*dx + dy*dy + nd) - 0.5);
+					if (ptypes[r&0xFF].state==ST_LIQUID)
+						per *= 0.1;
+					
+					dx *= per; dy *= per;
+					parts[i].vx += dx; parts[r>>8].vx -= dx;
+					parts[i].vy += dy; parts[r>>8].vy -= dy;
+				}
+			}
+	return 0;
+}
diff --git a/src/elements/newgraphics.c b/src/elements/newgraphics.c
index af332fb..cf7b9a8 100644
--- a/src/elements/newgraphics.c
+++ b/src/elements/newgraphics.c
@@ -168,6 +168,14 @@ int graphics_WIFI(GRAPHICS_FUNC_ARGS)
 	*pixel_mode |= EFFECT_LINES;
 	return 0;
 }
+int graphics_GEL(GRAPHICS_FUNC_ARGS)
+{
+	int q = cpart->tmp;
+	*colr = q*(32-255)/120+255;
+	*colg = q*(48-186)/120+186;
+	*colb = q*208/120;
+	return 0;
+}
 int graphics_PRTI(GRAPHICS_FUNC_ARGS)
 {
 	*firea = 8;