# How can I draw an ellipse with a rainbow color?

I need to draw a rainbow-colored (hue colormap) ellipse in tikz.

Something like this but then in an ellipse shape, and in tikz.

I've thought about drawing to ellipses, one with rainbox filling, the other white, but I don't know how to fill a shape with a rainbow.

I have looked at questions relating to paths and colormaps, but that won't do unless I really split the ellipse in many parts, which seems like it could be done a lot easier.

Is this OK?

\documentclass{standalone}

\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
\begin{scope}[xscale=2]
\clip (-2,0) rectangle (2,2);

Remove the \clip if you want the full ellipse.
• Huh, I had already found the shading=color wheel option but it didn't work. Now it does. This is great, thanks! What does the even odd rule part actually do? – rubenvb Jul 22 '14 at 11:10