Gnuplot在rowstack直方图中重复颜色 [英] Gnuplot repeats colors in rowstack histograms

问题描述

我目前使用gnuplot和rowstacked直方图绘制一些数据。
问题是，在选择了9种不同的颜色后，颜色开始重复。人们可以看到这也发生在官方的gnuplot例子（参见 http://gnuplot.sourceforge.net/ demo / histograms.html - Example 4& 5）

I am currently plotting some data using gnuplot with rowstacked histograms. The problem is, that the colors start to repeat after 9 different colors have been chosen. One can see this also happening in the official gnuplot examples (see http://gnuplot.sourceforge.net/demo/histograms.html - Example 4 & 5)

有没有办法让gnuplot使用更多不同的颜色？

Is there any way to tell gnuplot to use more different colors?

推荐答案

没有完全自动化的方法来做到这一点，但你可以使用设置样式线... ，然后使用它们。这里，我只是使用一个简单的迭代来定义几种颜色：

There is no fully automated way to do this, but you can define as many line styles as you want with set style line ... and then use them. Here, I just use a simple iteration to define several colors:

do for [i=1:20] {
    set style line i linecolor rgb hsv2rgb(0.05*(i-1), 1, 1)
}
set style data histograms
set style histogram rowstacked
set style fill solid border -1
set boxwidth 0.75
plot for [i=1:20] 'mydata.dat' u 2 ls i t 'ls '.i

数据文件只包含值

1 0.1
2 0.2
3 0.3

注意， hsv2rgb 函数仅从5.0开始定义。对于早期版本，您可以使用以下用户定义的函数来获得相同的功能：

Note, that the hsv2rgb function is defined only since 5.0. For earlier version you can use the following user-defined function to get the same functionality:

rgb2int(r,g,b) = int(255*r)*2**16 + int(255*g)*2**8 + int(255*b)
hsv2rgb(h,s,v) = (s == 0 ? rgb2int(v,v,v) : (HSV_h = h*6.0, HSV_i = int(floor(HSV_h)), HSV_f = HSV_h - HSV_i, HSV_p = v*(1.0 - s), HSV_q = v*(1.0-s*HSV_f), HSV_t = v*(1.0-s*(1.0-HSV_f)), (HSV_i%6 == 0 ? rgb2int(v,HSV_t,HSV_p) : (HSV_i%6 == 1 ? rgb2int(HSV_q,v,HSV_p) : (HSV_i%6 == 2 ? rgb2int(HSV_p,v,HSV_t) : (HSV_i%6 == 3 ? rgb2int(HSV_p,HSV_q,v) : (HSV_i%6 == 4 ? rgb2int(HSV_t,HSV_p,v) : rgb2int(v,HSV_p,HSV_q))))))))

让你更容易，你可以把这个代码放到一个配置文件或第三个脚本 hsv2rgb.gp 并包含 load'hsv2rgb.gp'

To make it easier, you could put this code into a configuration file, or a third script hsv2rgb.gp and include it with load 'hsv2rgb.gp' before using the function.

使用4.6.3版本的输出是：

Output with 4.6.3 is:

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