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Shaded Integral with a Draggable Bound

A psplot of sin(x) whose shaded region follows a draggable uservariable — visualizing the integral as you move the bound.

This diagram is interactive — use your mouse or touch to play with it.

Source

\begin{pspicture}(-4,-3)(4,3)
\uservariable{alpha}(0,0){x}
\psplot[algebraic,linewidth=2pt,fillstyle=solid, fillcolor=lightblue]{-4}{alpha}{sin(x)}
\psplot[algebraic,linewidth=2pt]{-4}{4}{sin(x)}
\psline{->}(-4,0)(4,0)
\end{pspicture}