App designer - deleting an unnamed plot

Question

Teshan Rezel 2021-4-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/798382-app-designer-deleting-an-unnamed-plot

评论： Cris LaPierre 2021-4-19

采纳的回答： Cris LaPierre

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Hi folks,

I have the following code for generating 1 or multiple plots on an image.

function ROI(app, index1, index2)
    hold (app.Image, "on")
    plot(app.Image, index1, index2, app.innerMarkerStyle, 'LineWidth', app.CrosshairThickness.Value, 'Color', app.crossHairColour, 'MarkerSize', app.CrosshairRadius.Value); 
    plot(app.Image, index1, index2, app.outerMarkerStyle, 'LineWidth', app.CrosshairThickness.Value, 'Color', app.crossHairColour, 'MarkerSize', app.CrosshairRadius.Value);                             
end

My question is, suppose there are 3 such plots. Is there a way to delete 1 and only 1 of them selectively?

Thanks

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Answer 1

Cris LaPierre 2021-4-10

1
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https://ww2.mathworks.cn/matlabcentral/answers/798382-app-designer-deleting-an-unnamed-plot#answer_672212

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If you capture the chart line object for each plot, you could use that with the delete function to remove just that line from the plot.

btw, it's best practice to always pair hold on with a corresponding hold off.

Here's a simple example.

% Create a plot with 3 lines

a=plot(rand(1,5));

hold on

b=plot(rand(1,5));

c=plot(rand(1,5));

hold off

% Now delete one of the lines using the line object

delete(b)

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Teshan Rezel 2021-4-18

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@Cris LaPierre apologies, I think I've not included the relevant functions! Here's the complete list!

methods (Access = private)
   function ButtonPushed(app, index)
        app.Counts(end) = 0;
        app.Percentages(end) = 0;
                    
        app.Counts(index) = app.Counts(index) + 1;            
        app.Counts(end) = sum(app.Counts, 1:7);
        
        for i = 1 : 7
         app.Percentages(i) = (app.Counts(i) / app.Counts(end)) * 100;                  
        end
        
        app.Percentages(end) = sum(app.Percentages, 1:7);
        app.CokeTable.Data = [app.Counts, app.Percentages]; 
        app.tallyOrder(end+1) = index;
        app.numManualTally = app.numManualTally + 1;
        
        TallyCheck(app);       
   end
    
   function ReverseButtonPushed(app, index)
        app.Counts(end) = 0;
        app.Percentages(end) = 0;
        app.Counts(index) = app.Counts(index) - 1;            
        app.Counts(end) = sum(app.Counts, 1:7);
        
        for i = 1 : 7
         app.Percentages(i) = (app.Counts(i) / app.Counts(end)) * 100;                  
        end
        
        app.Percentages(end) = sum(app.Percentages, 1:7);
        app.CokeTable.Data = [app.Counts, app.Percentages]; 
        
        app.numManualTally = app.numManualTally - 1;
        TallyCheck(app);
   end       
    
   function ROI(app, index1, index2)
        hold (app.Image, "on")
        plot(app.Image, index1, index2, app.innerMarkerStyle, 'LineWidth', app.CrosshairThickness.Value, 'Color', app.crossHairColour, 'MarkerSize', app.CrosshairRadius.Value); 
        plot(app.Image, index1, index2, app.outerMarkerStyle, 'LineWidth', app.CrosshairThickness.Value, 'Color', app.crossHairColour, 'MarkerSize', app.CrosshairRadius.Value);                             
        hold(app.Image, "off")
   end
          
   function DisplayCrosshairs(app)
        I = imshow(app.img, "Parent", app.Image); 
        app.Image.XLim = [0 I.XData(2)];
        app.Image.YLim = [0 I.YData(2)];
        
        app.Width = app.Image.XLim;
        app.Height = app.Image.YLim; 
        quarterHeight = range(app.Height)*0.125;
        halfHeight = range(app.Height)*0.5;
        threeQuarterHeight = range(app.Height)*0.875;
        quarterWidth = range(app.Width)*0.125;
        halfWidth = range(app.Width)*0.5;
        threeQuarterWidth = range(app.Width)*0.875;
        
        app.positionVector = {quarterWidth quarterHeight;halfWidth quarterHeight;threeQuarterWidth quarterHeight;quarterWidth halfHeight;halfWidth halfHeight;threeQuarterWidth halfHeight;quarterWidth threeQuarterHeight;halfWidth threeQuarterHeight;threeQuarterWidth threeQuarterHeight};
        app.checkMatrix = [app.TopLeft.Value app.TopMiddle.Value app.TopRight.Value app.CentreLeft.Value app.CentreMiddle.Value app.CentreRight.Value app.BottomLeft.Value app.BottomMiddle.Value app.BottomRight.Value];
        
        count = 0;
        
        for i = 1 : 9
            if app.checkMatrix(i) == 1
               ROI(app, app.positionVector{i,1:2});
               count = count + 1;
            end
        end
        
        if count == 0
           msgbox('Please select a quadrant for the crosshair to be displayed in');
        end
        
   end 
   function ResinThreshold(app)
       imgGrey = rgb2gray(app.img);
       [counts, ~] = imhist(imgGrey, 255);
       T = otsuthresh(counts);
       BW = imbinarize(imgGrey, T);
       BW = bwareaopen(BW, app.AreaOpen.Value);
       BW = imfill(BW, 'holes');
       BW = bwperim(BW);
       BW = imdilate(BW, ones(app.DilationMatrixDimensions.Value));
       BW = imerode(BW, ones(app.ErosionMatrixDimensions.Value));
       BW = imfill(BW, 'holes');
       app.img = app.img.*repmat(uint8(BW),[1 1 3]); 
   end  
    
   function DisplayImage(app)
     app.currentImage = fullfile(app.imageFolder(app.imageNumber).folder, app.imageFolder(app.imageNumber).name);
     app.Image.Position = [0 0 app.UIFigure.Position(3:4)];
     app.img = imread(app.currentImage);
    if app.ThresholdResin.Value == 1
       ResinThreshold(app); 
    end
    
    
    DisplayCrosshairs(app); 
    app.ImageNumber.Value = app.imageNumber;
    app.TotalNumber.Value = app.fileNumber;         
    app.numSamplesPerImage = sum(app.checkMatrix, 1:9); 
   end
   
   function TallyCheck(app) 
        if app.numManualTally >= app.numSamplesPerImage
           app.imageNumber = app.imageNumber + 1;
           app.numManualTally = 0;
        elseif app.numManualTally <= 0
           app.imageNumber = app.imageNumber - 1;
           app.numManualTally = app.numSamplesPerImage;  
        end
   end  
       
    end