MATLAB: How to plot annotation text data by means of a MATLAB file on a 3-D figure plot in MATLAB 6.5 (R13)

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I am trying to plot annotation text data by means of a MATLAB file on a 3-D figure plot but I cannot obtain the desired result. The text data should remain at its position even when the 3D model is rotated. I also want the text to extend over several lines.

In an interactive mode I can use the GUI Insert->Text tool, creating a

"hidden" annotation layer with the desired result. However, the hidden annotation layer is not accessible (or created) for a new figure that is created by a MATLAB file.

Best Answer

This feature has been added in MATLAB 7.0 (R14). If you are using a previous version, read the following:

In MATLAB 6.5 (R13) there is no function called ANNOTATION which can be used to create text annotation objects that are specified in normalized figure units and not with respect to the current axis.

The workaround for this issue is to create a hidden overlay axes on where text can reside and not be subject to the motion of the primary visible axes.

fig1=figure;
ax1=axes;
surf(peaks)
set(gca,'CameraUpVector',[0 0 -1],'CameraUpVectorMode','manual') ;
ax2=axes;
set(ax2,'visible','off');
txt=text;
set(txt,'position',[0,1],'string',{'This is the 1 line','This is the 2 line'});
axes(ax1)

To apply multiple lines of text to one text object, set the text object string to a cell array, where each element in the cell array is a string containing a line of text.

Related Solutions

MATLAB: How to rotate a textbox annotation in MATLAB 7.9 (R2009b)

The ability to rotate annotation textboxes is not available in MATLAB 7.9 (R2009b). It is possible to rotate the child text object of the annotation box but not the entire annotation box.

As a workaround, you can either use a text object or a textarrow annotation in place of the textbox annotation, as shown in the following examples:

plot(1:10)
h=annotation('textarrow',[0.5 0.5],[0.5 0.5],'string','textarrow annotation', ...
      'HeadStyle','none','LineStyle', 'none', 'TextRotation',90);
%%now change axes limits - note that the annotation maintains its position
set(gca,'Ylim',[0 6],'Xlim',[0 8]);

As an alternative, when creating a text object using the TEXT function, recalculate the position of the object when changing the axes limits:

figure
plot(1:10)
tx=6;
ty=5;
text(tx,ty,'text textbox','Rotation',90);
%second figure for comparison
figure
plot(1:10)
h=text(tx,ty,'text textbox','Rotation',90);
%change axes limits and reposition text object accordingly
xl=get(gca,'Xlim');
yl=get(gca,'Ylim');
newxl=[0 6];
newyl=[0 8];
scalex = diff(newxl)/diff(xl);
scaley = diff(newyl)/diff(yl);
pos = get(h, 'Position');
tx = pos(1);
ty = pos(2);
offsetx = tx-xl(1);
offsety = ty-yl(1);
set(gca,'Xlim',newxl,'Ylim',newyl);
set(h, 'Position', [newxl(1)+offsetx*scalex newyl(1)+offsety*scaley]);

MATLAB: Are the text labels cut off when I rotate and resize a surface plot in MATLAB 7.7 (R2008b)

The ability to automatically preserve the text labels while rotating and resizing a figure is not available in MATLAB.

To work around this issue, you can adjust the position of the axes using the 'Position' property so the text labels fit inside the figure.

p = get(gca,'Position');
set(gca,'Position',[p(1) p(2)+0.1 p(3)-0.1 p(4)-0.2]);

You can also put the above code in the ResizeFcn to automate the process. You would still have to experiment with different axes positions to make sure that the text labels fit inside the figure.

Best Answer

Related Solutions

MATLAB: How to rotate a textbox annotation in MATLAB 7.9 (R2009b)

MATLAB: Are the text labels cut off when I rotate and resize a surface plot in MATLAB 7.7 (R2008b)

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