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How can I replace white color with some other color while keep using cbarf for values less than cutoff mark?

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Ankitkumar Patel
Ankitkumar Patel 2023-7-19
编辑： Adam Danz 2023-7-19
Ran in:
data = rescale(peaks,0,600);
newTickVals = [ 100 300 350 450];
limits=[newTickVals(1) newTickVals(end)];
x=1:1:49;z=ones(size(x));
f1=figure('Position', [0 400 800 500]);
axes( ...
'Parent' ,f1, ...
'Units' , 'normalized' );
contourf(data,newTickVals, "ShowText" , "on" )
C=colormap( 'parula' );
colormap(flipud(C))
h1=cbarf(data,newTickVals);
How can I replace white color (<100 values) with some other color (let say red) while keep using cbarf (attached)?

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Adam Danz
Adam Danz 2023-7-19
编辑：Adam Danz 2023-7-19
Ran in:
Interesting function cbarf (author: @M MA).
That white section is just your axes background. One hacky solution is to set the axes color which works well with filled contours. An alternative would be to create a patch that covers the white area. This would be considerably more work but not impossible. Additionally, you'll need to update the color of the lower triangle in the pseudo-colorbar.
Recreate the figure
data = rescale(peaks,0,600);
newTickVals = [ 100 300 350 450];
limits=[newTickVals(1) newTickVals(end)];
x=1:1:49;z=ones(size(x));
f1=figure('Position', [0 400 800 500]);
axes( ...
'Parent' ,f1, ...
'Units' , 'normalized' );
contourf(data,newTickVals, "ShowText" , "on" )
C=colormap( 'parula' );
colormap(flipud(C))
h1=cbarf(data,newTickVals);
Change color
Choose a new color
newColor = 'r'; % or [1 0 0]
Make the change
set(gca,'color', newColor)
cbax = findall(f1,'Tag','cbarf_vertical_linear');
cbax.Children(1).FaceColor = newColor;
  2 个评论
Adam Danz
Adam Danz 2023-7-19
True, if there are nans, the holes in the filled contour will appear as red in this hacky solution.
You could get the contour coordinates to create a patch object that is plotted on top of the controur regions at z<100.
There are a number of functions on the file exchange that help to get the contour coordinates. Example: getContourLineCoord​inates

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