GUI example 06

This example will show the following
  • Storing and retrieving data from the framework
  • Adding a "smart" axes to the GUI which allows
    • Zooming
    • Magnifying glass
    • Interactive visual data Inspection
A simple GUI is created as shown below

Magnification & visual inspection (click on image for animated gif).


The magnified image can also be moved to another location in the figure, so you can see the original data and the magnified data, see image below.

Interactive zooming of data


The x and or y axis can be zoomed by the user clicking on the axes limits to zoom in - left sets min, right max and middle click auto scale.

function [hTab] = example6 ( )

  hFig = dialog ( 'windowstyle', 'normal', 'name', 'Matpi Website Example 6', 'resize', 'on' );

  % initialise the main GUI (this allows the left and right tabs to be resizeable

  [hTab, hFig] = Tab ( 'initialise', 'Main Tab', hFig, [0 0 1 1], 'buttonHeight', 0 );

  % Create the 1st page

  Tab ( 'addtab', hTab, 'Page 1' )

  % store data in the GUI

  Tab ( 'addData', hTab, 'x', 0:0.02:10*pi );

  % Add a axes with smart interaction

  Tab ( 'axes_smart', hTab, 'Page 1', 'myAxes', 'position', [0.1 0.4 0.8 0.5], 'ylim', [-1 1] );

  % Create a listbox adding a callback

  Tab ( 'listbox', hTab, 'Page 1', 'myList', 'position', [0.1 0.1 0.4 0.2], ...

         'string', { 'cos' 'sin' 'tan' }, 'Callback', @(a,b)ChangeList ( hTab ) );

  % Run Callback to update the plot

  ChangeList ( hTab );

end

function ChangeList ( hTab )

  % Get the axes handle and clear it.

  ax = Tab ( 'handle', hTab, 'Page 1', 'myAxes' );

  cla(ax);

  % Retrieve the data we stored in the GUI earlier.

  x = Tab ( 'getData', hTab, 'x' );

  % Generate some noise to add to the plot

  noise = rand(1, length(x))./10;

  % Switch on the selected item in the listbox.

  switch Tab ( 'get', hTab, 'Page 1', 'myList', 'selectedString' );

   case 'cos' % Note turning off the HitTest is not a requirement of smartAxes - it just makes in easier.

     plot ( ax, x, cos ( x ) + noise, 'HitTest', 'off' );

   case 'sin'

     plot ( ax, x, sin ( x ) + noise, 'HitTest', 'off' );

   case 'tan'

     plot ( ax, x, tan ( x ) + noise, 'HitTest', 'off' );

  end

end