GNUPLOT - 在饼图中指定颜色

Question

我正在尝试使用GNUPLOT生成饼图，我已经生成了图，并且我已使用数组为图例指定了颜色。这是代码，我使用此question作为参考

script.sh

#!/usr/bin/gnuplot
set terminal pngcairo nocrop enhanced size 800,400 font "Siemens Sans,8"
set output 'output.png'
filename = 'source.dat'
rowi = 1
rowf = 2

# 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=0.2

# 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
colors = "blue red"

# 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 rgb word(colors,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

生成饼图的源文件是

source.dat

"Tipo","Valor" 
"Periodo laboral",723 
"Periodo no laboral",81 

当我运行脚本时，我得到一个看起来像这样的output.png文件

output.png

如您所见，饼图颜色不适合图例颜色。这是因为我可以通过for索引轻松设置图例颜色，但是为了生成饼图，我正在遍历every子句，因此我无法获得索引。我也尝试过这样的事情：

plot filename u (centerX):(centerY):(radius):(pos):(pos=pos+angle($2)):(colour=colour+1) every ::rowi::rowf w circle lc rgb(word(colors, colour)),\

但我有以下错误：

  

＆＃34; gnuplot / piechart.sh＆＃34;，第49行：警告：此绘图样式不适用于6列。设置为xyerrorbars

你能帮帮我吗？提前谢谢。

已更新

我想我迈出了一步。我删除了plot命令的(colour=colour+1)部分，现在我可以设置一种特定的颜色

plot filename u (centerX):(centerY):(radius):(pos):(pos=pos+angle($2)):(colour=colour+1) every ::rowi::rowf w circle lc rgb word(colors,colour+1),\

但是这会使饼图完全变为蓝色，我仍然需要索引或其他东西，因为它似乎colours不会改变其值。

Answer 1

分段绘制饼图应该有效：

colorsrgb = "#0000FF #FF0000"

plot for [i=1:rowf-rowi+1] filename u (centerX):(centerY):(radius):(pos):(pos=pos+angle($2)) every ::i::i w circle lc rgb word(colorsrgb, i)

在Windows上使用Gnuplot 5.0.0进行测试。