Drawing simple figures

Version A

Game of Life

• Demonstration
• The board:
  • background color - standard for window
  • grid for 40x25 fields
  • life cells drawn as red ellipses
  • refresh the board after every step (2 times per second)
  resizeable (make sure it will scale properly to the size of window's client area)
  • initialize randomly cells after pressing Escape key (probability of life for a cell: 50%)
• Rules of the game :
  • a dead cell with exactly three live neighbors becomes a live cell (birth)
  • a live cell with two or three live neighbors stays alive (survival)
  • in all other cases, a cell dies or remains dead (overcrowding or loneliness)
  • use indices modulo size of the board (i.e. the last cell in a row is a neighbour of the first cell in the same row)
• Hints:
  • all created GDI objects must be deleted
  • objects selected as current on DC must not be deleted
  • good scenario:
    1. create new object
    2. select new object on DC and remember old object
    3. draw something
    4. restore old object
    5. delete new object
  • example:
    HBRUSH brush = CreateSolidBrush( RGB( 255, 0, 0 ));
    HBRUSH oldBrush = (HBRUSH)SelectObject( hdc, brush );
    // drawing
    SelectObject( hdc, oldBrush );
    DeleteObject( brush );
  • WM_KEYDOWN

• Approximate points:
  • drawing the board : 2.5
  • resizing the board: 1.5
  • refreshing the board 2 times per second: 1.5
  • initializing randomly after pressing Escape key: 2.0
  • applying rules of the game: 2.5