Other complex plotting methods: contour plots

[queue-miscreant]

Domain coloring is great, but there are other important ways to plot complex functions.
For example, WolframAlpha provides images showing how rectangular contours get transformed under the map:

Also, this plotting method looks really cool with lerps. Here's an example I've been working on:

There's an argument to be made that this is feature creep, but making people add side dependencies for things that accomplish similar goals tends to annoy people just as badly.

[hernanat]

but making people add side dependencies for things that accomplish similar goals tends to annoy people just as badly.

On the one hand I agree with this, on the other hand I'm wondering if we should make a separate package that takes together dcolor + these others, so people can have the choice to install all three, or continue using them individually.