使用gnuplot生成饼图 [英] Generation of pie chart using gnuplot

问题描述

我有一个CSV文件，其数据如下:

I have a CSV file with data like:

name,age
raju,23
anju,34
manju,56
sanju,56

我正在尝试使用gnuplot生成饼图. 这是我正在执行的命令:

I'm trying to generate a pie chart using gnuplot. Here's the command I'm executing:

#!/usr/bin/gnuplot -persist
reset
set terminal wxt
unset key
set datafile separator ","
set xlabel "USERS"
set ylabel "AGE"

plot 'file.csv' using ($0):2:($0):xticlabels(1) with circles lc variable notitle

我在做什么错了?

推荐答案

显然， Gnuplot尚不支持饼图；但我们可以手工绘制.

Apparently, Gnuplot does not support pie charts yet; but we can draw it by hand.

首先，我们需要获取与数据文件中第二列相关的角度和百分比:

First, we need to obtain the angles and percentages related to the second column in your datafile:

set datafile separator ','
stats 'file.csv' u 2 noout      # get STATS_sum (sum of column 2)

ang(x)=x*360.0/STATS_sum        # get angle (grades)
perc(x)=x*100.0/STATS_sum       # get percentage

然后配置画布:

set size square                 # square canvas
set xrange [-1:1.5]
set yrange [-1.25:1.25]
set style fill solid 1

unset border
unset tics
unset key

并绘制饼图:

Ai = 0.0; Bi = 0.0;             # init angle
mid = 0.0;                      # mid angle
i = 0; j = 0;                   # color
yi  = 0.0; yi2 = 0.0;           # label position

plot 'file.csv' u (0):(0):(1):(Ai):(Ai=Ai+ang($2)):(i=i+1) with circle linecolor var,\
     'file.csv' u (1.5):(yi=yi+0.5/STATS_records):($1) w labels,\
     'file.csv' u (1.3):(yi2=yi2+0.5/STATS_records):(j=j+1) w p pt 5 ps 2 linecolor var,\
     'file.csv' u (mid=Bi+ang($2)*pi/360.0, Bi=2.0*mid-Bi, 0.5*cos(mid)):(0.5*sin(mid)):(sprintf('%.0f (%.1f\%)', $2, perc($2))) w labels

plot命令的第一行绘制饼图，其中(0):(0):(1):(Ai):(Ai=Ai+ang($2)):(i=i+1)列为:

The first line in the plot command draws the pie chart, where the columns (0):(0):(1):(Ai):(Ai=Ai+ang($2)):(i=i+1) are:

• 第1-2列:磁盘中心的x和y坐标
• 第3列:磁盘的半径
• 第4-5列:该区域的开始角度和结束角度
• 第6列:区域的颜色

• columns 1-2: x and y coordinates of the center of the disk
• column 3: radius of the disk
• column 4-5: begin and end angles of the region
• column 6: color of the region

plot命令的第二和第三行放置标签，最后一行将百分比放置在每个区域的中间.

The second and third lines in the plot command place the labels, and the last line puts the percentages in the middle of each region.

结果:

参考文献:(1) Gnuplot令人惊讶(2) Gnuplot技巧

References: (1) Gnuplot surprising (2) Gnuplot tricks

基于两个相关的问题(此和

Based on two related questions (this and this), a new script is proposed:

filename = 'test.csv'

rowi = 1
rowf = 7

# obtain sum(column(2)) from rows `rowi` to `rowf`
set datafile separator ','
stats filename u 2 every ::rowi::rowf noout prefix "A"

# rowf should not be greater than length of file
rowf = (rowf-rowi > A_records - 1 ? A_records + rowi - 1 : rowf)

angle(x)=x*360/A_sum
percentage(x)=x*100/A_sum

# circumference dimensions for pie-chart
centerX=0
centerY=0
radius=1

# label positions
yposmin = 0.0
yposmax = 0.95*radius
xpos = 1.5*radius
ypos(i) = yposmax - i*(yposmax-yposmin)/(1.0*rowf-rowi)

#-------------------------------------------------------------------
# now we can configure the canvas
set style fill solid 1     # filled pie-chart
unset key                  # no automatic labels
unset tics                 # remove tics
unset border               # remove borders; if some label is missing, comment to see what is happening

set size ratio -1              # equal scale length
set xrange [-radius:2*radius]  # [-1:2] leaves space for labels
set yrange [-radius:radius]    # [-1:1]

#-------------------------------------------------------------------
pos = 0             # init angle
colour = 0          # init colour

# 1st line: plot pie-chart
# 2nd line: draw colored boxes at (xpos):(ypos)
# 3rd line: place labels at (xpos+offset):(ypos)
plot filename u (centerX):(centerY):(radius):(pos):(pos=pos+angle($2)):(colour=colour+1) every ::rowi::rowf w circle lc var,\
     for [i=0:rowf-rowi] '+' u (xpos):(ypos(i)) w p pt 5 ps 4 lc i+1,\
     for [i=0:rowf-rowi] filename u (xpos):(ypos(i)):(sprintf('%05.2f%% %s', percentage($2), stringcolumn(1))) every ::i+rowi::i+rowi w labels left offset 3,0

此新代码导致:

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