File Exchange Pick of the Week

Our best user submissions

Custom GINPUT

Idin's pick for this week is custom GINPUT by our very own Jiro Doke.

This is the story of how a user's request for a feature turned into a File Exchange submission by one of our very capable Application Engineers.

A few months ago I was working with a user trying to build a MATLAB GUI when we ran into a seemingly trivial problem: we needed the user to select a few points on a figure. Solution was simple: ginput. The problem was that on some images MATLAB's default "cross-hair" cursor blended into the background. Here's an example that shows a mild case of the problem.

You can see how it could be difficult to pick a precise point using this cross-hair. MATLAB's ginput function provides no flexibility to change the cursor. We found the myginput submission by Frederic Moisy. This got us a little closer, but not quite there. That's when I asked Jiro for help. Jiro wrote a new function based on MATLAB's ginput that makes the color and thickness of the cursor fully customizable. Here’s the same image, but this time with Jiro's ginputc function:

load woman
imagesc(X)
colormap(map)
ginputc('color', 'r', 'linewidth', 3)

The picture speaks for itself! Jiro went further and added two new features that I hadn't even asked for:

  • In the top left corner he shows a list of points the user has already selected
  • He can optionally connect the selected points (very useful if you're selecting an area)

I would like to see some of these features find their way into MATLAB's ginput function. But in the meantime, I encourage you to download and try Jiro's ginputc function.

As always, your comments here are greatly appreciated.




Published with MATLAB® R2012b

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