uiaxes restore not returning to original view follow zoom on image

Question

Robert Heaton 2023-4-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1952489-uiaxes-restore-not-returning-to-original-view-follow-zoom-on-image

回答： Prathamesh 2023-8-18

Working with Matlab app, placing a image within a UIaxes in a uitab. The image is added with imagesc, axis set to equal, and a colorbar added. A toolbar is attached to the uiaxes using the axtoolbar(ax,{}) command, and a button added with the Userdata =uiaxes.Position prior to displaying the image. Zooming the image with drawn rectangle results in reduced length or width of the image axes, and using a the toolbar "restore" results in a view of the full image within the reduced image axes. Trying to restore the position of the axes through a callback to a new toolbar button is unsuccessful, as the callback event returns an axes object which has parent uiaxes, neither of which have position matrices matching the position used to create the original uiaxes, and assigning the original position array to these objects doesn't restore the view to the original size. Is there a mechanism to get the uiaxes to behave so that scaling is preserved and the axes viewing area remains a fixed size? Portions of code shown below.

        function [results,btn] = MakeTab(app,tabName)
            % create a new tab in the image tab group with an axis
            results = uitab(app.Images,"Title",tabName);
            % attach an axis for drawing an image
            haxis = uiaxes(results,'Position',app.axisPosition,'Box','on');
            % set up the axis toolbar
            thistoolbar = axtoolbar(haxis,{'datacursor','pan','zoomin','zoomout','restoreview'});
            % define the restoreview callback to include resizing the axis
            btn = axtoolbarbtn(thistoolbar,'push');
            btn.Icon = 'ReSize_Icon.png';
            btn.Tooltip = 'Resize Image';
            btn.ButtonPushedFcn = @ForceAxisSize;
            btn.UserData = app.axisPosition;
        end
        
function ForceAxisSize(src,evt)
    evt.Axes.Position = src.UserData;
    %zoom(evt.Axes.Parent,1);
    drawnow;
end
function [haxis,himage] = DisplayFilmImage(ThisAxis,ImageData,CenterRow,CenterCol,XPixelSize,YPixelSize,DisplayUnits,ColorMap)
[NumRow,NumCol] = size(ImageData);
[XStart,XFinish] = CalcImageDataRange(NumCol,XPixelSize,CenterCol);
[YStart,YFinish] = CalcImageDataRange(NumRow,YPixelSize,CenterRow);
% put in range limiting tests to prevent satuartion in the noise
CRangeLimit = 0.999;
CRangeMargin = 1.05;
BinCount = 200;
% bin the intensities in a histogram
[BinnedArray,BinLevels] = histcounts(ImageData,BinCount);
% sum the array
CummArray = cumsum(BinnedArray);
CummArray = CummArray/CummArray(end);
% find the level at which we achieve the set limit
MaxRange = CRangeMargin * BinLevels(find(CummArray > CRangeLimit,1,'first'));
if isempty(MaxRange) || MaxRange == 0
    MaxRange = 1;
end
if isempty(ThisAxis)
    himage = imagesc(ImageData, 'XData', [XStart,XFinish], 'YData', [YStart,YFinish],[0,MaxRange]);
else
    himage = imagesc(ThisAxis,ImageData, 'XData', [XStart,XFinish], 'YData', [YStart,YFinish],[0,MaxRange]);
end
haxis = himage.Parent;
axis(haxis,'equal');
colormap(haxis,ColorMap);
colorbar(haxis);
haxis.YDir = 'normal';
haxis.XLabel.String = ['Width (' DisplayUnits ')'];
haxis.XLabel.FontSize = 12;
haxis.YLabel.String = ['Length (' DisplayUnits ')'];
haxis.YLabel.FontSize = 12;
end

Views of image

Original:

Following Zoom:

Restore after zoom:

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Prathamesh 2023-8-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1952489-uiaxes-restore-not-returning-to-original-view-follow-zoom-on-image#answer_1289247

在 MATLAB Online 中打开

Hi,

I understand that when you try to zoom in the “uiimage” the aspect ratio of the image changes.

You can try setting the aspect ratio property of the axes to [1 1 1] which will maintain the scaling while zooming in or zooming out.

ax = axes;
ax.DataAspectRatio = [1 1 1];

Refer to the documentation below to get more information.

https://www.mathworks.com/help/matlab/ref/axes.html

For restoring the zoomed image, you can try to set axis limits to the original limits.

xLimits = xlim;
yLimits = ylim;
% Zoom in on a specific region of interest
zoom(2);  % Zoom in by a factor of 2
% Restore the original image size and axis
xlim(xLimits);
ylim(yLimits);