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

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)?

[Adam Danz]

FYI, I've removed the attachment. The function can be found on the File Exchange:

cbarf (author: @M MA).

Answer 1

[Adam Danz]

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;

[Ankitkumar Patel]

I think this fails whenever we have Nan values in data beacuse than Nan value patch will also be in red.

[Adam Danz]

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