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Re: Just primitive ColorFunction


You could also use:

Plot[Sin[x], {x, 0, 4 Pi}, AxesOrigin -> {0, 0}, Axes -> {True, True},
  PlotStyle -> Thick,
 ColorFunction -> (If[Sin[#] >= 0, RGBColor[1, 0, 0],
     RGBColor[0, 0, 1]] &), Filling -> Axis, ImageSize -> {380, 280},
 ColorFunctionScaling -> False, FillingStyle -> Automatic]

Note that the output will be much bigger since VertexColors are
generated for each vertex. Also, segments crossing the x axis will
have end vertices of different colors, so some color bleeding will
occur.

This kind of plots are useful to represent "spectrum" coloring as in:


Plot[Sin[x], {x, 0, 4 Pi}, AxesOrigin -> {0, 0}, Axes -> {True, True},
  PlotStyle -> Thick,
 ColorFunction -> (ColorData["VisibleSpectrum"][
     380 + # (750 - 380)] &), Filling -> Axis,
 ImageSize -> {380, 280}, ColorFunctionScaling -> True,
 FillingStyle -> Automatic]

-Ulises Cervantes
WRI


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