Maxima

Question

我在 wxmaxima 中制作了一个等高线图，并想在顶部绘制一个多边形（由其角点定义）。类似这样，但在一个情节中：

lx:[-0.5,1.5,2,-1.5]$
ly:[-1,-0.5,1,1.5]$

wxcontour_plot(20*exp(-x^2-y^2)-10,[x,-2,2],[y,-2,2],[yx_ratio,1],[xlabel,"x[m]"],[ylabel,"y[m]"],
    [gnuplot_preamble, "set cntrparam levels 18; set grid; set size ratio -1; set key outside top rmargin"],
    [grid,2,100])$
wxdraw2d(polygon(lx,ly))$

Answer 1

这里有一些使用 gnuplot_preamble 的解决方法：

lx:[-0.5,1.5,2,-1.5]$
ly:[-1,-0.5,1,1.5]$

wxcontour_plot(20*exp(-x^2-y^2)-10,[x,-2,2],[y,-2,2],[yx_ratio,1],[xlabel,"x[m]"],[ylabel,"y[m]"],
[gnuplot_preamble, "set cntrparam levels 18; set grid; set size ratio -1; 
set key outside top;
set object 1 polygon from -0.5,-1. to 1.5,-0.5 to 2.,1. to -1.5,1.5 to -0.5,-1. fs solid fc rgb 'red';"],
[grid,2,100])$

如果您希望多边形不透明，请将 front 添加到多边形定义中。

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plot