Comments on: Adding annotations to graphs

By: Trine

Trine — Wed, 04 Aug 2010 12:57:02 +0000

How do you place the arrow if it has to be exactly on the graph?
Say I have a function f(x) and I want an arrow from f(1) to f(2). It can be difficult to do that precisely, especially when having several graphs (like trajectories in a phase portrait for an ODE)
I’ve tryed with
annotation(‘arrow’, [1, 2], [f(1), f(2)])
but annotation uses the grid of the whole figure so these are not the correct points.
Anyway to do this?

By: Natasha

Natasha — Thu, 18 Mar 2010 01:32:53 +0000

Back to the click to annotate thread, I've found the easiest way to do this is to change the update function for the regular old data cursor (see datacursormode documentation). I had an array in my workspace that I wanted to reference for my annotation. Most of the update function can even be auto-generated if you right click on the figure with the data cursor toggled and select 'Edit Text Update Function...' My callback function was as simple as:

function output_txt = myfunction(obj,event_obj)
% Display the position of the data cursor
% obj          Currently not used (empty)
% event_obj    Handle to event object
% output_txt   Data cursor text string (string or cell array of strings).

load Excd46401 Excd  %My reference array.

idx = get(event_obj,'DataIndex'); %Return index of position

output_txt = {['Type: ',Excd.Type{idx}]}; %Specify text.

end

By: Shower Enclosures

Shower Enclosures — Wed, 03 Feb 2010 00:57:59 +0000

Completely agree with your comments on this – thanks for taking the time to post.

By: Yair Altman

Yair Altman — Wed, 17 Jun 2009 23:01:09 +0000

@Elmer – take a look at my DataMatrix submission on the File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/16181

It does almost exactly what you need, so you can get everything with only minor modifications of its source code.

Yair

By: Elmer Fittery

Elmer Fittery — Wed, 17 Jun 2009 19:57:30 +0000

I have a gui to display a matrix in terms of colors.

1-10 is yellow
11-20 is blue
21-30 is green, etc, etc.

When I move my cursor over the gui, which is a box with
a bunch squares filled with colors, I want to modify the
text associated with the text message attached to the box.

So as I move my cursor over a boxed color, I want to display
@(x, y) is: value, where x and y is matrix index of the boxed color and the value is the value associated with the boxed color.

Any suggestions on where I can find how to create a mouse-over callback and use “set(gca, mouse-over, ”);”

thanks

By: Mike

Mike — Tue, 06 May 2008 12:06:37 +0000

Pat,

Without knowing the details of your issue, I would say go to copy options and try using the “match screen size” and “bitmap” options before copying.

If that does not help, and you have a license with software maintenance, you should contact technical support (with the same “request a feature” link on the right sidebar) or if not, ping the community on comp.soft-sys.matlab (MATLAB newsgroup link on the top navigation bar).

By: Pat

Pat — Mon, 05 May 2008 20:36:12 +0000

James,
I like using the annotation, but I often find that when I copy the plot and paste it into a document, the arrows and text have changed location and/or size in the pasted version. Sometime, I manually shift things around to get them to line up in the correct spot, but usually I give up on annotating them in Matlab and wait until I am in Word or PowerPoint to do the annotation. However, I would really like to be able to do the annotation in Matlab since it is much more intuitive.

How can I get around these resizing and repositioning problems?

By: Ken

Ken — Sat, 01 Mar 2008 00:49:27 +0000

Hi Tim,

I agree…that sounds like a useful feature. I’ve forwarded your request on to the appropriate team.

Thanks for the great feedback,
-Ken

By: Tim

Tim — Fri, 29 Feb 2008 21:02:58 +0000

I think what Hao is requesting is something just like the ‘TooltipString’ property on uicontrols and the built in tool tips that pop-up when you mouse over the figure toolbar buttons. I’d like to second that request. Is it possible to add a ‘TooltipString’ property to graphics objects such as lines, patches, surfaces, etc.? And maybe even a ‘MouseHoverFcn’ property that defines a function to call when the mouse is hovered over the object. This is just like the existing ButtonDownFcn property but wouldn’t require a mouse click. (The MouseHoverFcn would just allow more end user customization over a simple tooltip display.)

By: Ken

Ken — Wed, 27 Feb 2008 22:07:56 +0000

Hi Hao,

I see what your driving at (I think) – you want to be able to toggle the annotations when you click them (or maybe have them popup when you mouse over them).

I’ll forward along your request!

-Ken