Update :- This appears to be a problem in which nodes near coords are handled by PGFPlots and incompatibility with Tikz decorations and fading library. I simply commented the nodes near coords line and I got squiggly lines in the top graph and no errors. However, I would still like to know in future, how to use nodes near coords while using decorations. I am still not sure if this constitutes a bug report though.
Original Problem:- I would like to decorate a bar graph in PGFPlots using Tikz decorations library. I find that when I try to decorate it with say zigzag or snake or random steps, it throws an error. This seems specific to bar graphs though. I went to my original data and I tried to decorate a similar data in Histogram plot (Histogram distribution itself is calculated in PGFPlots from raw data), wherein I took the original dataset, used PGFPlots to draw the histogram plot and used Tikz to decorate. To my amazement if I used PGFPlots to calculate the histogram, the options seem to be different than when I use a bar graph on preprocessed data. I would like to decorate the bar graph shown in top figure similar to line edges shown in bottom figure. I have attached the code that generates both. How could I do that?
\documentclass[12pt]{article}
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}
\usepackage[margin=1cm]{geometry}
\usepackage{pgfplots}
\usetikzlibrary{patterns,fadings}
\begin{filecontents*}{Total_Histogram.dat}
0.00000000e+00 2.00000000e+00
5.00000000e-01 0.00000000e+00
1.00000000e+00 3.00000000e+00
1.50000000e+00 3.00000000e+00
2.00000000e+00 4.00000000e+00
2.50000000e+00 1.00000000e+00
3.00000000e+00 2.00000000e+00
3.50000000e+00 1.00000000e+00
4.00000000e+00 2.00000000e+00
4.50000000e+00 2.00000000e+00
5.00000000e+00 3.00000000e+00
5.50000000e+00 5.00000000e+00
6.00000000e+00 3.00000000e+00
6.50000000e+00 4.00000000e+00
7.00000000e+00 7.00000000e+00
7.50000000e+00 5.00000000e+00
8.00000000e+00 4.00000000e+00
8.50000000e+00 0.00000000e+00
9.00000000e+00 2.00000000e+00
9.50000000e+00 2.00000000e+00
1.00000000e+01 1.00000000e+00
1.05000000e+01 0.00000000e+00
1.10000000e+01 3.00000000e+00
1.15000000e+01 2.00000000e+00
1.20000000e+01 0.00000000e+00
1.25000000e+01 0.00000000e+00
1.30000000e+01 1.00000000e+00
1.35000000e+01 0.00000000e+00
1.40000000e+01 0.00000000e+00
1.45000000e+01 0.00000000e+00
1.50000000e+01 0.00000000e+00
\end{filecontents*}
\begin{filecontents*}{Quiz1_Data_EE1100_Spring2014.txt}
0 1 1 0 3 4 9
0 0 0 0.5 1.5 2.5 4.5
1 1 0 0 1.5 2.5 6
0 0 0 0 1.5 4 5.5
1 1 1 1 3 4 11
1 1 0 0 0 1 3
1 0.5 0 0 3 0 4.5
1 0.5 0 0 0 0 1.5
1 1 1 0 3 4 10
1 0 1 1 0 4 7
1 1 0 0 1.5 6 9.5
1 0 0 0.5 1.5 4 7
1 0 0 0 1.5 4.5 7
0 0 1 0.5 1.5 2 5
1 0 0 0.5 3 1.5 6
1 1 1 1 3 6 13
1 1 0 0 0 6 8
0 0 0 0 0 0 0
0 1 1 1 1.5 1 5.5
0 1 0 0.5 3 7 11.5
1 1 1 0.5 3 1 7.5
1 1 0 0 1.5 2 5.5
1 0 0 0.5 1.5 1 4
1 1 1 1 2 1 7
1 0 1 0 1.5 2 5.5
1 0 1 0 3 3 8
1 0 0 0 0 1 2
1 1 0 0.5 1.5 3 7
1 1 1 0.5 3 1 7.5
0 1 1 0.5 3 2 7.5
1 1 0 0 1.5 8 11.5
1 0 0 0 0 0 1
0 0 1 0 3 1 5
1 1 0 0.5 3 2 7.5
0 1 0 0 1.5 0 2.5
1 1 0 0.5 3 1 6.5
1 1 1 1 3 4 11
1 1 1 0 1.5 5 9.5
1 1 1 0.5 1.5 3 8
1 0 0 0.5 0 2 3.5
1 0 1 0 1.5 3 6.5
0 1 1 1 3 3 9
1 0 0 0 0 1 2
1 0 1 0 1.5 3 6.5
1 1 0 0.5 0 1.5 4
1 1 1 0 0 4 7
0 0 0 0 1.5 0 1.5
1 1 1 0.5 1.5 6 11
1 1 1 0.5 1.5 3 8
0 0 0 0 0 0 0
1 1 0 0.5 3 1 6.5
1 1 1 0 0 4 7
0 1 0 0 0 0 1
1 0 1 0 0 0 2
1 0 0 0 0 4 5
0 1 0 0.5 1.5 0 3
0 1 0 0 0 0 1
1 0 0 0 0 1 2
1 0 1 0 1.5 2 5.5
1 0 1 0 0 4 6
1 1 1 0 1.5 3 7.5
0 0 0 0.5 0 1 1.5
\end{filecontents*}
\begin{document}
\pagestyle{empty}
\begin{tikzpicture}
\centering
\begin{axis}
[
width=\textwidth,
ybar,
ymin=0,
xtick=data,
xticklabel style={rotate=45},
legend columns=-1,
nodes near coords,
every node near coord/.append style={
rotate=30,
xshift=1mm,
inner sep=1pt,
color=gray
},
ytick={0,1,2,3,4,5,6,7},
ymajorgrids,
major grid style={thick,white},
axis on top,
tick pos=left,
xlabel=Total Points in Quiz-1,
ylabel=Number of Students,
x label style={at={(axis description cs:0.5,-0.05)},anchor=north},
title={\bf Performance of students in Quiz-1}
]
\addplot+[color=red!30,draw=black,forget plot] table [y index=1,x index=0,skip coords between index={5}{31}]{Total_Histogram.dat};
\addplot+[color=yellow!30,draw=black,forget plot] table [y index=1,x index=0,skip coords between index={0}{5},skip coords between index={11}{31}]{Total_Histogram.dat};
\addplot+[color=blue!30,draw=black,forget plot] table [y index=1,x index=0,skip coords between index={0}{11},skip coords between index={17}{31}]{Total_Histogram.dat};
\addplot+[color=green!30,draw=black] table [y index=1,x index=0,skip coords between index={0}{17}]{Total_Histogram.dat};
\node [fill=red!30,,decoration={random steps,segment length=6pt,amplitude=2pt},decorate] at (axis cs:0.65,3.75) {Attention};
\node [fill=yellow!30] at (axis cs:3.5,3.75) {C,D grades};
\node [fill=blue!30] at (axis cs:7,7.35) {B grade};
\node [fill=green!30] at (axis cs:11,3.75) {A,S grades};
\draw [->,blue,ultra thick] (axis cs:5.9,0) -- (axis cs:5.9,6.5) node [anchor=north east,draw=gray,xshift=-1.5mm]{Average=5.9};
\draw [<->,gray,ultra thick] (axis cs:-0.1,5.4) -- (axis cs:5.8,5.4) node [anchor=north,midway]{28 Students};
\draw [<->,gray,ultra thick] (axis cs:6.0,5.4) -- (axis cs:15,5.4) node [anchor=north,midway]{34 Students};
\end{axis}
\end{tikzpicture}
\tikzfading[name=middle,
top color=transparent!20,
bottom color=transparent!20,
middle color=transparent!50]
\begin{tikzpicture}[path fading=middle]
\begin{axis}[
width=\textwidth,
ymin=0,
title=Quiz-1 Total Points,
xtick=data,
x tick label style = {rotate=45},
ybar interval,
xtick align=outside,
xmajorgrids=false,
enlarge x limits=false,
ymajorgrids=true,
xlabel=Total points obtained,
ylabel=Number of Students,ytick=data,
x label style={at={(axis description cs:0.5,-0.05)},anchor=north},
thick
]
\addplot+[hist={bins=3,data min=0,data max=1.5},decorate,draw=black,path fading,fill=green!20,decoration={random steps,segment length=6pt,amplitude=1pt}] table [y index=1] {Quiz1_Data_EE1100_Spring2014.txt};
\addplot+[hist={bins=3,data min=0,data max=1.5},decorate,draw=black,path fading,decoration={random steps,segment length=6pt,amplitude=1pt}] table [y index=2] {Quiz1_Data_EE1100_Spring2014.txt};
\addplot+[hist={bins=3,data min=0,data max=1.5},decorate,draw=black,path fading,decoration={random steps,segment length=6pt,amplitude=1pt}] table [y index=3] {Quiz1_Data_EE1100_Spring2014.txt};
\addplot+[hist={bins=3,data min=0,data max=1.5},decorate,draw=black,path fading,decoration={random steps,segment length=6pt,amplitude=1pt}] table [y index=4] {Quiz1_Data_EE1100_Spring2014.txt};
\end{axis}
\end{tikzpicture}
\end{document}
By Commenting Nodes near coords and adding decorations, I get the following image:-
However, now I cannot use nodes near coords any more.
By Commenting Nodes near coords and adding decorations. How did you get last figure, i.e bar with decorations?tikzpicturecode part for the last figure.