Am I doing something wrong? I can’t correct the problem. Can you help me please.

This is the code:

f = GXFigure();
set(f.Parent, 'Units', 'normalized', 'Position', [.2 .2 .6 .6], 'Name', 'TestQuiver');
[X,Y] = meshgrid(-2:.2:2);
Z = X.*exp(-X.^2 - Y.^2);
[DX,DY] = gradient(Z,.2,.2);
ax = subplot(gxgcf,1,1,1);
q1 = quiver(ax,X,Y,DX,DY, 0.9);

Attempt to reference field of non-structure array.

Error in subplot (line 43)
set(0, 'CurrentFigure', target.Parent);%figure(target.Parent);%

Error in subplot (line 76)
    ah=subplot(varargin{1:2}, varargin{3});

f = GXFigure();
x = -5:0.1:5;
gr1 = gxgca();
a1 = line(gr1, x, cos(x), 'LineSpec','-ob');
b1 = line(gr1, x, sin(x), 'LineSpec','-sg');
annotation(gcf,'arrow',[0.6 0.5],[0.2 0.4],'HeadLength',4,'LineWidth',5);
gr1.getObject().getView().autoScale();

Nothing appears…

Can you please show an example of how to annotate with an arrow?

Can’t wait for Aplha 3 then !

Thanks again for that awesome piece of work.

Yannick
Not yet I am afraid. I hope to post the Alpha3 version soon. That has quite a few new elements: mouse selectable ROIs, area plots, bar charts etc. many from suggestions arising from this blog.
The ROIs (and also a color bar) are there as draggable insets in Alpha3 and I plan to implement a legend that way too.
Regards
Malcolm

One question to the more experienced users, is there an easy way to produce a legend with the line and marker properties such as the default in Matlab ?

Thanks!

PS

  
annot.setPreferredSize(java.awt.Dimension(19,15));

might look better as the Swing layout has only 1-pixel resolution.

@Peter
I forgot – annotations use graphics not swing so that option is not available. I’ll need to add some code, But here is a solution using JButtons:

 
gr=ax.getObject().getView();
for i=1:size(X,1) 
    for j=1:5
        annot=javaObjectEDT(javax.swing.JButton(num2str(y(i,j),'%0.2f')));
        annot.setPreferredSize(java.awt.Dimension(20,15));
        annot.setFont(java.awt.Font('Arial',java.awt.Font.ITALIC, 8));
        gr.add(annot,i,j,javax.swing.SwingConstants.CENTER,javax.swing.SwingConstants.CENTER);     
    end
end

Add callbacks to the buttons directly.

To replace (rather than supplement) the default mouse + mouse motion listeners with MATLAB callbacks, you will need to explicitly remove the existing Java listeners.

Peter
The colors fonts etc are all editable properties of the underlying java object.
For alignment, I need to add some new methods but the existing
add(component, x, y, alignX, alignY)
method in the graph container should be OK (the component will not be added to the list of annotations though so I’ll improve this).