How to fill a graph exclusing given points?

조회 수: 2 (최근 30일)
Anna
Anna 2019년 9월 19일
답변: Steven Lord 2019년 9월 20일
If a graph has a cluster of points, I want the graph to be filled such that every other point except the cluster is coloured
  댓글 수: 8
Adam Danz
Adam Danz 2019년 9월 19일
If you have the coordinates of the cluster boundary, you can use the axis limits to create a match with the empty cluster region.
Here's an example
Anna
Anna 2019년 9월 20일
Thank you

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Steven Lord
Steven Lord 2019년 9월 20일
Let's make a random (well, not so random, more arbitrary) polygon.
A = nsidedpoly(5, 'Center', [1 1], 'Radius', 2);
If you wanted to enclose a non-regular region you can use polyshape instead of nsidedpoly (in fact nsidedpoly makes a polyshape.) Plot it and make it red.
p = plot(A, 'FaceColor', 'r');
Find the axes that contains the plotted polygon.
ax = ancestor(p, 'axes');
Make the axes background cyan.
ax.Color = 'c';
Because the plotted polygon is translucent you can see the cyan background "through" it, which makes it look very not red. Let's make it fully opaque so you can't see the background through it.
p.FaceAlpha = 1;
There we go; red pentagon on a cyan background.

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