how to delete an object in a plot using the delete button in keyboard

Hi all,

I want to delete an object I created in a plot using the delete button. I created a GUI with a plot plotting a figure as described by the following:

t = 0:pi/5:2*pi;
figure
patch(sin(t),cos(t),'y')
axis equal

Now how should I delete it using the delete button?

Thanks

Viv

[Mahdi]

What do you want to delete? Do you want to delete the whole plot? Close the figure?

Why do you want to use the delete button? Why not close, or alt+F4?

[Vivekram]

Hi Mahdi, I want to delete the polygon object inside the plot and not the plot itself.

Thanks

Viv

Answer 1

[Walter Roberson]

Use the figure KeyPressFcn or WindowKeyPressFcn callback. Test the received key. If it is the delete character, then delete() the object handle.

[Vivekram]

Hi Walter,

Can you please provide me with an example .

Thanks,

Viv

[Walter Roberson]

http://www.mathworks.com/matlabcentral/newsreader/view_thread/157527

After which,

delete(findobj(gca, 'type', 'patch'))

[Vivekram]

Hi walter,

That is awesome. Thanks a lot.

Can I also one more thing. Say if I have two object in the plots, say two polygon. The above method that you described deletes everything but what if I had to delete only one of them?

Sorry to be persistent.

Regards Viv

[Walter Roberson]

How do you want to distinguish which one you want to delete?

[Vivekram]

say one of them is of larger diameter and a different colour. Or the other method I was thinking was assigning each object a name which is then added to a list box in the gui. When I click on the appropriate name to be deleted, I press the delete button and the corresponding object in the plot gets deleted. I assume this is what you are asking.

[Walter Roberson]

It would be easier to do it "by name", by setting the Tag field of the patch() object to the name, and findobj(figurenumber, 'Tag', 'TagNameHere')

[Vivekram]

Awesome... Thanks Walters

[Image Analyst]

Please "Accept" the answer.