Thread Subject: Color Gradation

Is it possible to fill a polygon with a color gradation
between two or more colors instead of just a solid color?
From the docs, it doesn't appear to be possible. If it's not
a built in option, how might I go about this?

Thanks in advance.

Ken

In article <fljigq$qf4$1@fred.mathworks.com>,
Ken Fleisher <k-fleisher.donotspamme@nga.gov> wrote:
>Is it possible to fill a polygon with a color gradation
>between two or more colors instead of just a solid color?
>From the docs, it doesn't appear to be possible. If it's not
>a built in option, how might I go about this?

Possibly if you use a patch() object for the polygon, and
specify the FaceColor as 'interp' ? See the documentation
on 'Patch Properties'.
--
  "There are some ideas so wrong that only a very intelligent person
  could believe in them." -- George Orwell

In article <fljigq$qf4$1@fred.mathworks.com>,
 "Ken Fleisher" <k-fleisher.donotspamme@nga.gov> wrote:

> Is it possible to fill a polygon with a color gradation
> between two or more colors instead of just a solid color?
> From the docs, it doesn't appear to be possible. If it's not
> a built in option, how might I go about this?
>
> Thanks in advance.
>
> Ken

Yes. This will create a patch with vertices at (0,0), (0,1) and (1,0)
and set the colors of those vertices to be red, green and blue
respectively with the colors in the middle being interpolated.

  x = [0;0;1]; % x-coordinates
  y = [0;1;0]; % y-coordinates
  rgb0 = [1 0 0;0 1 0;0 0 1]; % row 1 = red, row 2 = green, etc.
  rgb = permute(rgb0,[1 3 2]); % make into 3D array, plane 1 = red, etc.
  patch(x,y,rgb)

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