Add parameter 'drawScale'

[zifredder]

Add input parameter 'drawScale', true|false, which defines a priori whether the scale should be drawn. If not, the plot area will not be rescaled to make room for the bar.
Also, if this property is changed after construction, adjust the plot size accordingly: If it is turned on, decrease the size and draw the bar. If it is turned off, increase the size (trying to restore the original position will probably be hard to impossible) and delete the scalebar; also, set 'drawScale' to false when the scalebar is deleted.
This would have the advantage that histograms where the scale is not desired are not automatically downsized, efficiently using the figure space.

[RoyiAvital]

I'd also add a mode which fits drawing image's Hue Histogram.
Something similar to:

[zifredder]

Firstly, this remark is not related to the issue and secondly, it is a very specific use case which I don't think is reasonable to be implemented as a proper functionality.

Anyways -- it is possible to use CircHist for this purpose. Consider this wrapper-function code:

function obj = CircHist_hue(varargin)

obj = CircHist(varargin{:});

% adjust title, tick labels etc.
obj.polarAxs.Title = [];
obj.polarAxs.ThetaAxis.TickLabels = [];
set([obj.avgAngH, obj.avgAngCiH, obj.rH], 'Visible', 'off');
obj.drawScale;

% adjust bar color
barH = obj.barH;
for iH = 1:numel(barH)
    currH = barH(iH);
    clrNew = rad2rgb(currH.ThetaData(1));
    currH.Color = clrNew;
end

% adjust offset disc color
discH = obj.whiteDiskH;
for iH = 1:numel(discH)
    currH = discH(iH);
    clrNew = rad2rgb(currH.ThetaData(1));
    currH.Color = clrNew;
end

% adjust baseline color
set(findobj(obj.polarAxs, 'Tag', 'baseLine'), 'Color', 'k');


    function rgbVal = rad2rgb(ang)
        % convert angle (rad) to rgb value according to hue
        hueVal = ang/(2*pi);
        rgbVal = hsv2rgb([hueVal, 1, 1]);
    end

end

And this example usage:

rgbData = imread('peppers.png');
hsvData = rgb2hsv(rgbData);
hueDeg = hsvData(:, :, 1) * 360; % convert to deg
obj = CircHist_hue(hueDeg(:));

Result: