尝试使用 PSTtricks 创建图片

Question

我正在尝试使用该包创建如图所示的抛物面图像，pstricks但在写入抛物线和椭圆的参数时出现一些错误（gradangle,gradbegin,gradend，...）。有什么建议吗？

这是我目前的代码：

\documentclass{article}
\usepackage{pstricks}
\usepackage{pst-plot}
\begin{document}
\begin{center}
\begin{pspicture}(-4,-3)(6,10)
\parabola[gradangle=90,fillstyle=gradient,gradbegin=white,gradend=darkgray,gradmidpoint=1](-3,7)(0,1)
\psellipse[gradangle=90,fillstyle=gradient,gradbegin=white,gradend=darkgray,gradmidpoint=0.2](0,7)(3,0.5)
\psline{->}(-4,0)(6,0)
\psline{->}(4,4)(-3,-3)
\psline{->}(0,6.5)(0,10)
\psline(0,-3)(0,1)
\end{pspicture}
\end{center}
\end{document}

Answer 1

pst-grad编码后添加pstricks如下图所示：

\documentclass{article}
\usepackage{pstricks,pst-grad}
\usepackage{pst-plot}
\begin{document}
\begin{center}
\begin{pspicture}(-4,-3)(6,10)
\parabola[gradangle=90,fillstyle=gradient,gradbegin=white,gradend=darkgray,gradmidpoint=1](-3,7)(0,1)
\psellipse[gradangle=90,fillstyle=gradient,gradbegin=white,gradend=darkgray,gradmidpoint=0.2](0,7)(3,0.5)
\psline{->}(-4,0)(6,0)
\psline{->}(4,4)(-3,-3)
\psline{->}(0,6.5)(0,10)
\psline(0,-3)(0,1)
\end{pspicture}
\end{center}
\end{document}