Function HighlightObject

roomedit/source/objects.cpp:425–540

*/

void HighlightObject(TMapDC &dc, int objtype, SHORT objnum, int color)
{
	SHORT n, m;
	SHORT x, y;
	SHORT x1, y1;
	SHORT start, end;

	if ( objnum == -1 )
		return;
		
	// use XOR mode : drawing any line twice erases it
	int OldROP2 = dc.SetROP2 (R2_XORPEN);

	switch ( objtype)
	{
	case OBJ_THINGS:
		assert (objnum >= 0 && objnum < NumThings);

		m = (GetKodObjectRadius (Things[objnum].type) * 3) / 2;
		x = Things[objnum].xpos;
		y = Things[objnum].ypos;

		dc.SetPenColor16(color);
		dc.DrawMapRect (x - m, y - m, x + m, y + m);
		dc.DrawMapArrow (x, y, Things[objnum].angle * 182, m * 10 / 8);
		break;

	case OBJ_LINEDEFS:
		assert (objnum >= 0 && objnum < NumLineDefs);

		start = LineDefs[ objnum].start;
		end   = LineDefs[ objnum].end;
		assert (start >= 0 && start < NumVertexes);
		assert (end   >= 0 && end   < NumVertexes);

		x = Vertexes[start].x;
		y = Vertexes[start].y;
		x1 = Vertexes[end].x;
		y1 = Vertexes[end].y;

		dc.SetPenColor16 (color);
		n = (x + x1) / 2;
		m = (y + y1) / 2;
		dc.DrawMapLine (n, m, n + (y1 - y) / 3, m + (x - x1) / 3);

		// Draw the vector
		// Set pen width to 3 (screen size, not map size!)
		dc.SetPenColor16 (color, 3);
		dc.DrawMapVector(x, y, x1, y1);

		// Draw sector attached (widh same tag number) to this LineDef
		if (color != LIGHTRED && LineDefs[ objnum].tag > 0)
		{
			for (m = 0; m < NumSectors; m++)
				if (Sectors[ m].tag == LineDefs[ objnum].tag)
					HighlightObject(dc, OBJ_SECTORS, m, LIGHTRED);
		}
		break;