added bar chart examples

tikz/bar-chart-grouping/Makefile

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+SOURCE = bar-chart-grouping
+DELAY = 80
+DENSITY = 300
+WIDTH = 500
+
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux
+
+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

tikz/bar-chart-grouping/bar-chart-grouping.tex

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+% Source: http://tex.stackexchange.com/a/69234/5645
+\documentclass[varwidth=true, border=2pt]{standalone}
+
+\usepackage{pgfplots}
+
+\begin{document}
+    \begin{tikzpicture}
+        \begin{axis}[
+            ybar,
+            ylabel={vaule/weight},
+            xlabel={items},
+            legend style={at={(0.5,-0.15)},
+            anchor=north,legend columns=-1},
+            width=0.8*\textwidth,
+            height=9cm,
+            bar width=7pt,
+            symbolic x coords={$x_1$,$x_2$,$x_3$,$x_4$,$x_5$},
+            xtick=data,
+            %nodes near coords,
+            %nodes near coords align={vertical},
+        ]
+            \addplot
+            coordinates {($x_1$,96000) ($x_2$,126000) ($x_3$,115000) ($x_4$,125000) ($x_5$,123000)};
+            \addplot
+            coordinates {($x_1$,27) ($x_2$,21) ($x_3$,27)  ($x_4$,15) ($x_5$,19)};
+            \legend{value, weight}
+        \end{axis}
+    \end{tikzpicture}
+\end{document}

tikz/bar-chart-simple/Makefile

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+SOURCE = bar-chart-simple
+DELAY = 80
+DENSITY = 300
+WIDTH = 500
+
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux
+
+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

tikz/bar-chart-simple/bar-chart-simple.tex

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+% Source: http://tex.stackexchange.com/a/8584/5645
+\documentclass[varwidth=true, border=2pt]{standalone}
+
+\usepackage{pgfplots}
+
+\begin{document}
+    \begin{tikzpicture}
+        \begin{axis}[
+            symbolic x coords={a small bar, a medium bar, a large bar},
+            xtick=data
+          ]
+            \addplot[ybar,fill=blue] coordinates {
+                (a small bar,   42)
+                (a medium bar,  50)
+                (a large bar,   80)
+            };
+        \end{axis}
+    \end{tikzpicture}
+\end{document}

tikz/bchart-simple/Makefile

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+SOURCE = bchart-simple
+DELAY = 80
+DENSITY = 300
+WIDTH = 500
+
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux
+
+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

tikz/bchart-simple/bchart-simple.tex

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+% Source: http://www.tug.org/texlive//Contents/live/texmf-dist/doc/latex/bchart/bchart.pdf
+\documentclass[varwidth=true, border=2pt]{standalone}
+
+\usepackage{bchart}
+
+\begin{document}
+    \begin{bchart}[step=2,max=10]
+        \bcbar{3.4}
+            \smallskip
+        \bcbar{5.6}
+            \medskip
+        \bcbar{7.2}
+            \bigskip
+        \bcbar{9.9}
+    \end{bchart}
+\end{document}