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看起来很漂亮！我会喜欢的！看看http://www.science4all.org/le-nguyen-hoang/integer-programming/

有人知道什么软件可以画这种图形吗？我有兴趣学习一下。

谢谢！ 在此处输入图片描述

答案1

评论

这张照片看起来很像是用Inkscape（我想，我可以通过箭头看出来）。

我使用万能的重新创建了你的绘图tikz。

执行

\documentclass[tikz]{standalone}
\usetikzlibrary{shapes}
\begin{document}
\begin{tikzpicture}[every path/.style={}]
    \begin{scope}
        \shade[right color=green,left color=white,opacity=0.7] (-0.5,-0.5) rectangle (0,6.5);
        \node[rotate=90,above] at (0,3) {Non-Negative Gold};
        \shade[top color=yellow,bottom color=white,opacity=0.7] (-0.5,-0.5) rectangle (8.5,0);
        \node[below] at (4,0) {Non-Negative Bills};
        \shade[left color=red,bottom color=red,right color=white,opacity=0.5] (-0.5,5.5) -- (8.5,3) -- (8.5,6.5) -- (-0.5,6.5) -- cycle;
        \path (-0.5,5.5) -- node[pos=0.23,sloped,above] {Volume Constraint} (8.5,3);
        \shade[left color=blue,right color=white,opacity=0.5] (2.5,6.5) -- (8.5,6.5) -- (8.5,0) -- (5,0) -- cycle;
        \path (5,0) -- node[pos=0.3,sloped,above] {Weight Constraint} (2.5,6.5);
        \node[text width=7em,align=center] at (2,2) {Feasible Region of the Linear Relaxation};
        \draw[->] (-0.5,0) -- (8.5,0) node[below] {Gold bars};
        \draw[->] (0,-0.5) -- (0,6.5) node[above] {Bill stacks};
        \node[rotate=-45,above,text width=9em,align=center] at (7.25,5.25) {Level Curves of the Objective Function};
        \path[clip] (-0.5,-0.5) rectangle (8.5,6.5);
        \foreach \i in {0.5,3,...,13} {
            \draw[help lines] (-0.5,\i) -- +(-45:15);
        }
    \end{scope}
    \draw[very thick,->] (9,3.25) -- node[above,text width=4cm,align=center] {\Large\bfseries Add Integrality Constraints} (13,3.25);
    \begin{scope}[shift={(14,0)}]
        \shade[right color=green,left color=white,opacity=0.7] (-0.5,-0.5) rectangle (0,6.5);
        \shade[top color=yellow,bottom color=white,opacity=0.7] (-0.5,-0.5) rectangle (8.5,0);
        \shade[left color=red,bottom color=red,right color=white,opacity=0.5] (-0.5,5.5) -- (8.5,3) -- (8.5,6.5) -- (-0.5,6.5) -- cycle;
        \shade[left color=blue,right color=white,opacity=0.5] (2.5,6.5) -- (8.5,6.5) -- (8.5,0) -- (5,0) -- cycle;
        \draw[->] (-0.5,0) -- (8.5,0) node[below] {Gold bars};
        \draw[->] (0,-0.5) -- (0,6.5) node[above] {Bill stacks};
        \foreach \i in {0,1,...,6.5} {
            \draw[help lines] (-0.5,\i) -- (8.5,\i);
        }
        \foreach \i in {2,4,...,8.5} {
            \draw[help lines] (\i,6.5) -- (\i,-0.5);
        }
        \foreach \i in {0,1,...,5} {
            \node[draw,cross out,label={left:\i}] at (0,\i) {};
        }
        \foreach \i in {0,1,...,4} {
            \node[draw,cross out] at (2,\i) {};
        }
        \foreach \i in {0,1,...,2} {
            \node[draw,cross out] at (4,\i) {};
        }
        \foreach \i in {0,2,...,6} {
            \node[below] at (\i,0) {\pgfmathparse{int(\i/2)}\pgfmathresult};
        }
        \node[very thick,draw=black,fill=white,rectangle,rounded corners,text width=8em,align=center] at (6,5) {Feasible solutions of the integer program are the crosses};
    \end{scope}
\end{tikzpicture}
\end{document}

输出

在此处输入图片描述

答案2

这只是 PSTricks 的一个起点。

\documentclass[pstricks,border=12pt,12pt]{standalone}
\usepackage{pst-plot}
\usepackage{pst-slpe}

\begin{document}
\psset{xunit=2cm}
\begin{pspicture}(-.5,-.5)(4.5,6.5)
    \psgrid[gridcolor=lightgray,subgriddiv=1,gridlabels=0](-.5,-.5)(4,6)
    \bgroup
        \psset{linestyle=none,linewidth=0,fillstyle=slope,slopesteps=500,fading}
        \psframe[slopebegin=white,slopeend=green](-.5,-.5)(0,6)
        \psframe[slopebegin=white,slopeend=yellow,slopeangle=90](-.5,-.5)(4,0)
        \pspolygon[slopebegin=red,slopeend=red!50!white,startfading=0,endfading=.7](-.5,5.8)(-.5,6)(4,6)(4,2)
    \egroup
    \psaxes[ticks=none]{->}(0,0)(-.5,-.5)(4,6)[\parbox{2cm}{\scriptsize Gold Bars},-90][\parbox{3cm}{\scriptsize \centering Bill\\ Stacks},90]
    \bgroup
        \psset{dotstyle=x,dotscale=2}
        \multido{\i=0+1}{6}{\psdots(0,\i)}
    \egroup
\end{pspicture}
\end{document}

在此处输入图片描述

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