added path in karnough map

tikz/karnaugh-map/Makefile

@@ -4,6 +4,7 @@ DENSITY = 300
 WIDTH = 512
 
 make:
+	pdflatex $(SOURCE).tex -output-format=pdf
 	pdflatex $(SOURCE).tex -output-format=pdf
 	make clean
 

tikz/karnaugh-map/Readme.md

@@ -0,0 +1 @@
+Thanks to Peter Grill for his help on [tex.stackexchange.org](http://tex.stackexchange.com/a/104285/5645)!

tikz/karnaugh-map/karnaugh-map.tex

@@ -1,41 +1,55 @@
-\documentclass{article}
-\usepackage[pdftex,active,tightpage]{preview}
-\setlength\PreviewBorder{2mm}
+\documentclass[border=2pt]{standalone}
 
 \usepackage[dvipsnames]{xcolor}
 \input{kvmacros}
 
+\usepackage{tikz}
+\usetikzlibrary{calc}%
+\newcommand{\tikzmark}[1]{%
+    \tikz[overlay, remember picture, baseline] \node (#1) {};%
+}
+
+\newcommand{\DrawArrow}[3][]{%
+    \begin{tikzpicture}[overlay,remember picture]
+        \draw[
+                ->, thick,% distance=\ArcDistance,
+                %shorten <=\ShortenBegin, shorten >=\ShortenEnd,
+                %out=\OutAngle, in=\InAngle, Arrow Style, #2
+                #1
+            ] 
+                ($(#2)+(-0.50em,3.5ex)$) to 
+                ($(#3)+(1.5em,0.0ex)$);
+    \end{tikzpicture}% <-- important
+}
+
 \begin{document}
-\begin{preview}
-	\karnaughmap{4}{$f(w,x,y,z)$}{{$w$}{$x$}{$y$}{$z$}}%
-	{
-		1100
-		1100
-		0011
-		0101
-	}
-	{
-		% Long one at top
-		\textcolor{Blue}{
-			\put(2,3.5){\oval(3.9,0.9)[]}
-		}
-		\textcolor{WildStrawberry}{
-			\put(0.9,3.5){\oval(1.7,0.8)[]}
-		}
-		% two left
-		\textcolor{Green}{
-			\put(0.7,1.5){\oval(1.9,0.9)}
-		}
-		\textcolor{Sepia}{
-			\put(1.5,1.5){\oval(1.6,0.7)}
-		}
-		\textcolor{Red}{
-			\put(1.92,1){\oval(0.9,1.9)}
-		}
-		\textcolor{LimeGreen}{
-			\put(1.76,-0.2){\oval(0.9,2.1)[t]}
-			\put(1.76,4.2){\oval(0.9,2.1)[b]}
-		}
-	}
-\end{preview}
+    \karnaughmap{4}{$f(w,x,y,z)$}{{$w$}{$x$}{$y$}{$z$}}%
+    {
+        1100
+        1100
+        0011
+        0101
+    }
+    {
+        \textcolor{Blue}{
+            \put(2,3.5){\oval(3.9,0.9)[]}
+        }
+        \textcolor{WildStrawberry}{
+            \put(0.9,3.5){\oval(1.7,0.8)[]}
+        }
+        \textcolor{Green}{
+            \put(0.7,1.5){\tikzmark{11}\oval(1.9,0.9)}
+        }
+        \textcolor{Sepia}{
+            \put(1.5,1.5){\oval(1.6,0.7)}
+        }
+        \textcolor{Red}{
+            \put(1.92,1){\oval(0.9,1.9)}
+        }
+        \textcolor{LimeGreen}{
+            \put(1.76,-0.2){\tikzmark{13}\oval(0.9,2.1)[t]}
+            \put(1.76,4.2){\oval(0.9,2.1)[b]}
+        }
+    }
+\DrawArrow[red, ultra thick, out=-180, in=-90, distance=1.5em, shorten >= -4.5ex]{13}{11}
 \end{document}