gnuplot：如何创建彩色网格区域，而不仅仅是彩色网格线？

Question

我正在使用“ gnuplot 5.2补丁程序级别2”。我正在尝试创建背景网格的彩色列或彩色区域，如下图所示。到目前为止，我只能为网格线着色。但是我想给网格区域上色。什么是最好的方法？这是我的代码：

set terminal svg 
set output 'out.svg'
set key off  
set xlabel 'X'
set ylabel 'Y'
set title 'Data'

set grid
set grid xtics  lw 0.25 lc rgb "#ff0000" # line only, but I want to color the whole area
#unset grid
#set grid ytics lt 0 lw 1 lc rgb "#0000ff"

set xrange [0:4]
set yrange [0:100]
set tics scale 0.5
set xtics nomirror
set ytics nomirror
set style fill solid noborder
set linetype 1 lc rgb 'red' lw 0.35
set linetype 2 lc rgb '#009900' 
set linetype 3 lc rgb 'black' lw 0.5
set boxwidth 0.5 relative 
set style fill solid border lc rgb "black" 
plot "data.txt" using 1:2:4:3:5:($5 < $2 ? 1 : 2)  linecolor variable with candlesticks, \
     "data.txt" using 1:6 with lines lt 3, \
     "data.txt" using 1:5:7 with filledcurves fs transparent solid 0.3 lc rgb "blue" 

这是我用于绘图的示例data.txt文件：

1 10 30  5 20 23 29
2 25 45 10 30 34 37
3 30 50 20 25 47 53

Answer 1

您可以使用虚拟功能，例如[x=0:16:1] '+' us (x/2):(100/(int(x)%4!=1)) with filledcurves x1。每第四个点生成一个NaN并中断曲线。

$data <<EOD
1 10 30  5 20 23 29
2 25 45 10 30 34 37
3 30 50 20 25 47 53
5 10 30  5 20 23 29
7 25 45 10 30 34 37
8 30 50 20 25 47 53
EOD

set style fill solid noborder
set linetype 1 lc rgb 'red' lw 0.35
set linetype 2 lc rgb '#009900' 
set linetype 3 lc rgb 'black' lw 0.5
set boxwidth 0.5 relative 
set style fill solid border lc rgb "black" 
plot sample [x=0:16:1] '+' us (x/2):(100/(int(x)%4!=1)) with filledcurves x1 fc rgb "#EEEEEE",\
     $data using 1:2:4:3:5:($5 < $2 ? 1 : 2)  linecolor variable with candlesticks, \
     $data using 1:6 with lines lt 3, \
     $data using 1:5:7 with filledcurves fs transparent solid 0.3 lc rgb "blue" 

此功能也可以用固定的y2分配给y2range轴，这对于带缩放的交互式绘图可能更方便。