More on GUIs and Graphics

1
Lecture 18

• More on GUIs and Graphics
• Selected examples from Chapters 12, 13, 14, 15
• Please read details in the book
• No need to memorize any of these details!!!
• HW7 please do something interesting and
  challenging with user interaction I will weight
  this assignment more than the others

2
Graphics

• When the system needs to redisplay a window or
  window component, it calls paintComponent
• Therefore, when we draw graphics on a swing
  component such as JPanel or JLabel or a
  user-defined subclass of one of these, we must
  put these statements inside an overriding
  paintComponent method
• Our program should not call paintComponent. Only
  the system calls it.
• When we want to make changes to a graphical
  display, we have to tell the system to call the
  overriding paintComponent. We do this by calling
  repaint().

3
Demos

• TestSwingCommonFeatures
• TestFigurePanel
• TestMessagePanel
• DisplayClock
• change from a still to a moving clock
• MoveMessageDemo
• ClockAnimation
• ButtonDemo
• CheckBoxDemo
• RadioButtonDemo
• TextFieldDemo
• TextAreaDemo
• ComboBoxDemo
• ScrollBarDemo
• etc