Screen capturing & zooming

• Demonstration
• An application with one window:
  • Functionality
    • Display in the window a part of the screen centered in the current position of mouse cursor
      • Use black colour to display areas outside the screen
    • Use '+' and '-' characters from keyboard to change the zoom: 1x, 2x, 4x, 8x, and 16x
    • Try to refresh the content of the window 4 times per second
  • Features of the window
    • No caption bar and menu
    • Resizable
    • Draggable using any point of the window's client area
    • No flickering
• Acceptable assumptions:
  • One monitor in the system
  • The resolution and number of colours in the system are unchanged

• Approximate points:
  • Functionality:
    • displaying a part of the screen (centered at mouse position, proper after changing the window's size): 5.0
    • changing the zoom: 2.0
  • Features:
    • no caption bar and menu: 0.5
    • resizable: 0.5
    • draggable by any client area's point: 1.0
    • no flickering: 1.0

• Links for uploading:
  • Solutions
  • Corrections