Bitmaps, flicker free drawing

Version A

Planes and spectators scene

• Demonstration
• The window:
  • in the background: the image showing two planes (the image can be downloaded here)
  • in the foreground: the image showing two spectators (the image can be downloaded here, and the image mask here)
  • horizontal scroll bar
  • vertical scroll bar (on the left side of the window)
  • resizeable
• Scene drawing:
  • The planes appear behind the spectators; use mask to remove the background from the original spectators bitmap
  • The spectators are always in the bottom right corner of the scene
  • Vertical scroll bar changes brightness of the spectators
  • The plane images resize according to the size of the window; the spectators are always the same size (do not resize with the window)
  • The planes move along with horizontal scroll bar (thus we have actually four planes in the scene; however only two of them are visible ate the same time)
• Requirements:
  • all drawing should be flicker-free
  • all created GDI objects must be deleted
  • objects selected as current on DC must not be deleted
  • avoid compilation warnings
• Hints:
  • StretchBlt(); MaskBlt(); BitBlt();
  • GetPixel(); SetPixel()
  • WM_HSCROLL, WM_VSCROLL, WM_SIZE
  • WS_EX_LEFTSCROLLBAR
• Approximate points:
  • flicker-free drawing: 1.5
  • scene sizing: 1.5
  • scene scrolling: 1.5
  • displaying bitmaps: 1.5
  • changing brightness of the spectators: 3.5
  • vertical scroll bar on the left side of the window: 0.5