graph triangles

tikz/graph-triangles/Makefile

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+SOURCE = graph-triangles
+DELAY = 80
+DENSITY = 300
+WIDTH = 512
+
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux *.data *.gnuplot
+
+gif:
+	pdfcrop $(SOURCE).pdf
+	convert -verbose -delay $(DELAY) -loop 0 -density $(DENSITY) $(SOURCE)-crop.pdf $(SOURCE).gif
+	make clean
+
+png:
+	make
+	make svg
+	inkscape $(SOURCE).svg -w $(WIDTH) --export-png=$(SOURCE).png
+
+transparentGif:
+	convert $(SOURCE).pdf -transparent white result.gif
+	make clean
+
+svg:
+	make
+	#inkscape $(SOURCE).pdf --export-plain-svg=$(SOURCE).svg
+	pdf2svg $(SOURCE).pdf $(SOURCE).svg
+	# Necessary, as pdf2svg does not always create valid svgs:
+	inkscape $(SOURCE).svg --export-plain-svg=$(SOURCE).svg
+	rsvg-convert -a -w $(WIDTH) -f svg $(SOURCE).svg -o $(SOURCE)2.svg
+	inkscape $(SOURCE)2.svg --export-plain-svg=$(SOURCE).svg
+	rm $(SOURCE)2.svg

tikz/graph-triangles/README.md

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+Compiled example
+----------------
+![Example](graph-triangles.png)

tikz/graph-triangles/coordinates.py

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+def giveCoordinates(n):
+    for y in range(0,n):
+        for x in range(y,2*n-y,2):
+            print(x,y)
+        print("")
+
+giveCoordinates(5)

tikz/graph-triangles/graph-triangles.tex

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+\documentclass{article}
+\usepackage[pdftex,active,tightpage]{preview}
+\setlength\PreviewBorder{2mm}
+
+\usepackage{ifthen}
+\usepackage{tikz}
+\usetikzlibrary{calc} 
+\tikzstyle{vertex}=[draw,red,fill=red,circle,
+minimum size=10pt,inner sep=0pt]
+\tikzstyle{edge}=[red, very thick]
+
+\begin{document}
+\begin{preview}
+\begin{tikzpicture}
+    \newcommand{\n}{10}
+    \foreach \y in {0, ..., \n}{
+        \pgfmathsetmacro{\loopend}{{2*\n-\y}}
+        \pgfmathsetmacro{\second}{{\y+2}}
+        \foreach \x in {\y, \second,..., \loopend}{
+            \ifthenelse{\n=\y}{\breakforeach}{}
+            \node (n-\x\y)[vertex] at (\x,\y) {};
+
+            \ifthenelse{\y=0}{}{\draw[edge] (\x,\y) -- (\x+1,\y-1);}
+            \pgfmathtruncatemacro\X{\x}
+            \ifthenelse{\X<\loopend}{\draw[edge] (\x,\y) -- (\x+2,\y);}{}
+            \ifthenelse{\X=\loopend}{}{\draw[edge] (\x,\y) -- (\x+1,\y+1);}
+            
+        }
+    }
+\end{tikzpicture}
+\end{preview}
+\end{document}