Text and Line only shown in debug mode

Hi,

I am making a GUI. Inside it, I have placed an axes. I am writing a text label and a line, creating a text and a line objects. When I set a breakpoint in the text() or line() functions, the objects are correctly drawn in the axes, but not when I run the script. I am using Matlab R2011a.

Thanks, Luis

Answer 1

[Grzegorz Knor]

Maybe add drawnow command after you draw the line, or try to use refresh function.

Answer 2

[Luis Andres]

Hi,

I have tried it, but without success. For instance, when I draw a line in an axes called "myAxes", I write:

ylim=get(handles.myAxes,'ylim'); 
a=50; 
line([a;a],ylim,'linewidth',2,'color',[0,0,0]);

So, I don´t make any reference to handles.myAxes in the line. Should I make it?

[Walter Roberson]

line(handles.myAxes, [a;a],ylim,'linewidth',2,'color',[0,0,0]);

[Luis Andres]

I have also tried it, but without success. In fact, this alternative does not work even in debug mode, because a handles cannot be passed as a parameter to 'line'.

[Jan]

Avoid to use "ylim" as name of a variable, because it is a built-in function. But this is not the cause of the problem.

The low-level function LINE needs the property name for the parent:

line('Parent', handles.myAxes, [a;a],ylim,'linewidth',2,'color',[0,0,0]);

You can obtain the handles of the line or text object and check it in non-debug mode:

H = line(... your calling sequenc...)

disp(get(H, 'Parent') == handles.myAxes)

Then you will find out, that the line is drawn to another AXES object. Therefore the specification of the Parent should solve the error.

[Walter Roberson]

You will probably need to put the 'Parent' parameter _after_ the positional parameters, as in

line([a;a],ylim, 'Parent', handles.myAxes, 'linewidth',2, 'color',[0,0,0]);