MATLAB: Changing the interpolation behavior in patch for ‘FaceAlpha’.

patch

Hi,

I am trying to use the patch function to create a region with varying transparency in a 2D figure. However, setting 'FaceAlpha' to 'interp' only allows for a linear interpolation between vertexes. Is there any way to change the interpolation to another function? For example, a quadratic or cubic change in the transparency values.

Thank you.

Best Answer

Hi,

For interpolating with a different function I suggest providing ‘FaceVertexAlphaData’ in way that it captures the nature of the function, that is if quadratic interpolation is needed for vertices you may declare the FaceVertexAlphaData in a quadratic way. For example if 3 vertices are there then [1,4,9] will give same behavior as required. Currently for ‘FaceAlpha’ any other interpolation method is not present except flat and interp.

Hope it helps.

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MATLAB: How to plot interpolated grid data and original datapoint set in the same plot

You can always simply plot all your points:

plot3(Xi,Yi,Zi,'r.')

Or with scatter:

scatter(Xi,Yi,32,Zi,'filled')

But to me this seems to be more interesting:

pcolor(xi,yi,zi),
% shading flat % or interp adjust shading to fit taste
hold on
plot(xi,yi,'k.','markersize',6)
scatter(contour_grid.X,contour_grid.Y,23,contour_grid.Z,'filled')

Or you could compare contour-plots:

Levels = linspace(min(Zi(:)),max(Zi),10);
contour(Xi,Yi,Zi,Levels,'k')
hold on
tri=delaunay(contour_grid.X,contour_grid.Y);
[c,h]=tricontour(tri,contour_grid.X,contour_grid.Y,contour_grid.Z,Levels);
plot(contour_grid.X,contour_grid.Y,'k.')

You can find the tricontour function on the file exchange: TRICONTOUR

HTH

MATLAB: No FaceAlpha property for area plot

I would use the patch function instead. According to the R2014b documentation for Patch Properties, the patch function does have a 'FaceAlpha' option in the name-value pairs. I will help if you need to re-write your code to make it work with patch.

Best Answer

Related Solutions

MATLAB: How to plot interpolated grid data and original datapoint set in the same plot

MATLAB: No FaceAlpha property for area plot

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