MATLAB: Can I not set the ‘Position’ of the ‘textbox’ based on a specific axis

axisMATLABposition;textbox;

I have a figure with an image, and I would like to create a textbox annotation and position it based on the figure's axes. I use the following code to achieve this:

   figure;imagesc 
   ax_sa = gca 
   hTextEnd = annotation('textbox', ... 
   'Position',[0.3 0.3 0.5 0.5],... 
   'FitBoxToText','on','String',' End','Color','g','FontSize',16,... 
   'FaceAlpha',1.0,'EdgeColor','w','BackgroundColor','w'); 
   set(hTextEnd,'Parent',ax_sa);

Why does MATLAB not consider the 'set' statement and position the textbox based on the axis?

Best Answer

The 'Parent' property of the annotation cannot be explicitly set. This property of the annotation is hidden and does not work the same way as other objects do.

Annotations are positioned based on the figure and cannot be positioned based on a specific axes.

More information about the 'Position' property can be found in the MATLAB Documentation link below:

https://www.mathworks.com/help/matlab/ref/matlab.graphics.shape.textbox-properties.html#d119e39559

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MATLAB: How to obtain the coordinates of the mouse on the screen displayed somewhere in the figure window

This enhancement has been incorporated in MATLAB 7.5 (R2007b).

As a workaround in previous MATLAB releases, you can use the following MATLAB function to track mouse motion:

function mousetrk
%MOUSETRK function to track mouse motion
% This function creates two static text controls
% which contain the x & y coordinates of the mouse
% The driving callback is executed by the
% WindowButtonMotionFcn of the figure.
figure
axes('Visible','off')
xbox = uicontrol('Style','text','Tag','xbox');
xboxlabel = uicontrol('Style','text','String','X Value',...
    'Position',get(xbox,'position')+[0 21 0 0]);
ybox = uicontrol('Style','text','Position',[90 20 60 20],'Tag','ybox');
yboxlabel = uicontrol('Style','text','String','Y Value',...
    'Position',get(ybox,'position')+[0 21 0 0]);
callback = ['pt = get(gca,''CurrentPoint'');'...
  'xbox = findobj(''Tag'',''xbox'');' ...
  'ybox = findobj(''Tag'',''ybox'');' ...
  'set(xbox,''String'',num2str(pt(1,1)));' ...
  'set(ybox,''String'',num2str(pt(1,2)));'];
set(gcf,'WindowButtonMotionFcn',callback);

For more information on the WindowButton functions, please refer to the Handle Graphics Property Browser:

https://www.mathworks.com/help/releases/R2009b/techdoc/infotool/hgprop/doc_frame.html

MATLAB: How to make a legend that has both rows and columns

The ability to present a legend in the form of a matrix is added in MATLAB 9.4(R2018a).

You can specify Number of columns by using NumColums property of Legend object.

For details, please refer the documentation.

https://www.mathworks.com/help/matlab/ref/legend.html?lang=en&s_tid=gn_loc_drop#bt6r30y

In R2017b and previous release, it is not available as a built-in feature of MATLAB.

However, there exist several workarounds:

1) Use the GRIDLEGEND function from MATLAB Central:

http://www.mathworks.com/matlabcentral/fileexchange/29248-gridlegend-a-multi-column-format-for-legends

2) Use the COLUMNLEGEND function from MATLAB Central:

http://www.mathworks.com/matlabcentral/fileexchange/27389-columnlegend

3) Use the FLEXLEGEND function from MATLAB Central:

http://www.mathworks.com/matlabcentral/fileexchange/31092-legendflex-a-more-flexible-legend

4) Use the following code:

% Example data
xData = linspace(0,pi);
y1 = sin(xData);
y2 = cos(xData);
y3 = sin(xData.^2);
y4 = cos(xData.^2);
% Plot the first two sets of data
ph1(1) = plot(xData,y3,'-ko','DisplayName','Y3 Legend Text');
hold on
ph1(2) = plot(xData,y4,'-bs','DisplayName','Y4 Legend Text');
% Create the first legend
lh1 = legend(ph1,'Location','NorthOutside','Orientation','horizontal');
lh1_position = get(lh1,'Position');
% Now set any axis properties that you want (Font, Ticks, etc)
fontSize = 16;
xlimits = [0,pi];
ylimits = [-1, 1];
xticks  = [0, pi/2, pi];
yticks  = [-1, 0, 1];
xTickLabels = {'0', 'pi/2', 'pi'};
set(gca,'XLim',xlimits,'YLim',ylimits,'FontSize',fontSize,'XTick',xticks,'YTick',yticks,'xTickLabel',xTickLabels);
% Name the first axis ax1 and create a second axis on top of the first
ax1 = gca;
ax2 = axes('Position',get(ax1,'Position'));
% Plot the second two sets of data on ax2
ph2(1) = plot(xData,y1,'-rd','DisplayName','Y1 Legend Text','Parent',ax2);
hold on
ph2(2) = plot(xData,y2,'-g^','DisplayName','Y2 Legend Text','Parent',ax2);
% Again set any axis properties that you want (Font, Ticks, etc) to make sure that the Legend fonts are the same
set(ax2,'XLim',xlimits,'YLim',ylimits,'FontSize',fontSize,'XTick',xticks,'YTick',yticks);
% Now, link the first axis to the second and make the second invisible
linkaxes([ax1 ax2],'xy');
set(ax2,'Color','none','XTick',[],'YTick',[],'Box','off');
% Now make the second legend just above the first
lh2 = legend(ax2,ph2,'Orientation','horizontal');
lh2_position = lh1_position;
lh2_position(2) = lh1_position(2)+1.25*lh2_position(4);
set(lh2,'Position',lh2_position);

Best Answer

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MATLAB: How to obtain the coordinates of the mouse on the screen displayed somewhere in the figure window

MATLAB: How to make a legend that has both rows and columns

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