Cross-sectional

Version A

Puzzle

• Demonstration
• Main window:
  • the Car bitmap 
    • bitmap file 
  • bitmap is cut into rectangular pieces, each of them has the same dimensions;
  • the pieces are initially put randomly on the window, fitting the rectangular net (use even permutation to make the puzzle solveable);
  • the piece representing bottom right corner is removed - instead of it an empty rectangle is visible;
  • menu option for restarting the game (new initial permutation);
  • the window is sizeable;
• Functionality:
• the empty rectangle can be swapped with any of its four (left, right, top, bottom) neighbour pieces
• swapping is executed by left clicking on the piece, which should be swapped with the empty rectangle  
• Requirements:
  • no flickering
  • drawing should be as efficient as possible (avoid StretchBlt in all cases except for resizing of the window)