Graphical User Interfaces II

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Graphical User Interfaces II
The central station is the bubble gum planet with
280 pounds of clay and three head phone lines
that come out and orbit the mass. The clay is not
only on the top of the table but under it and
under the chairs. It is inspired by the gum under
tables rebelliously put there by those imprisoned
in boring pedantics. It is a monument to the
struggle of repressed phyiscality. Its form is
never finalized as people freely sculpt it.
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Outline

• Announcements
• HW IV due a week from Friday
• Either GUI or Volume Viz or Choose-your-own
• Summary of Friday
• Programming converttemp.m
• Advanced GUI features
• Homework III
• Course Evaluations

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When we last saw our heros

• GUIs are made of UIcontrols of various ilks
  (slider, push buttons, radio buttons etc.)
• Position the controls and set properties with
  GUIDE
• callback field is a function call that gets
  executed when the control is activated

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Example converttemp.m

• Weve set the positions, lets set some data
• Set sliders min max values /- 50C
• Set sliders values0C
• Set edits stringsnum2str(value)
• Set Celsius button to on (value1) and others to
  off (0)
• Set Kelvin and Fahrenheit sliders visibility to
  off
• Set figures userdata to handle matrix

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Functionality of converttemp

• Top-down design is critical to GUI development
• Figure out the big picture first, then the
  details
• 1. Sketch layout of objects
• 2. Create layout with GUIDE
• 3. Describe what should happen when buttons are
  pressed, sliders slid in English or pseudocode
• 4. Add functionality gradually--simple things
  first

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Functionality of converttemp

• 3. Describe what should happen when buttons
  pressed, sliders slid
• Radio Buttons (Tradio.m)
• 1. turn corresponding slider on, others off
• Edits (Tedit.m)
• 1. convert string to number adjust
  corresponding sliders value
• 2. convert value to other units and update their
  edits sliders
• Sliders (Tslider.m)
• 1. convert value to string adjust corresponding
  edits string
• 2. convert value to other units and update their
  edits sliders
• Tconvert.m-- handles 2.

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Miscellaneous Advanced GUI features

• File Open/Save dialogs uigetfile uisavefile
• can place these calls in any function
• especially common inside callback of GUI button
• Common GUI features
• There are 18 fields that all Matlab objects have
  (things like position, type, and tag)
• ButtonDownFnc allows objects to respond to user

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Button Down Functions

• ButtonDownFnc acts like a callback--it contains a
  function call that is executed when user clicks
  on object
• Could make stop sign turn green when clicked
• Get the zf(x,y) of a patch where the user
  clicked (x,y)
• function zlookup
• axget(gcbo,parent) axes of object
• xyget(ax,CurrentPoint)
• ltget x, y, Z, from patchs userdatagt
• zinterp2(x,y,Z,xy(1),xy(2))
• ltsend results to appropriate placegt

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Other Scientific Visualization Courses

• This is the only course to focus on scientific
  visualization, especially using Matlab.
• If you are interested in computer graphics
• CS 417 Computer Graphics and Visualization (lear
  OpenGL, make )
• If you are interested in making effective
  visualizations
• try the Communications Department which offers
  courses on visual communication, human-computer
  interaction, and scientific writing

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Other Scientific Computing Courses

• CIS Tools Curriculum
• Fall MATLAB
• 401 the basics
• 402 visualization
• Spring General tools
• 403 Developing scientific computer programs
  (compilers, debuggers, managing large projects)
• 404 Numerical libraries
• 403 begins Feb. 18
• 404 begins March 25 (after spring break)

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Evaluations

• Please give me as much data as you can
• specific lecture/topics you liked those you
  didnt
• other topics to cover?
• Tools Curriculum mini-course format?
• Thanks!