GDI

Sample task

Ocean wave

• Demonstration
• Scene:
  • in the bottom half of the window: water drawn using bitmap from task03a_water.bmp file
  • in the top half of the window: sky drawn using bitmap from task03a_sky.bmp file
  • in the middle of the window: Bezier's curve separating water from sky, drawn using 4 points
  • points should be drawn as circles filled with red colour
  • allow to move points using left mouse button (please note only 1 point for this requirement)
• Technical requirements:
  • no flickering (during window's resizing, repainting and points' moving)
  • use mouse capture to get information about dropping point outside the window
  • bitmaps should be loaded from files, if there is no file show a message box and terminate the application
  • you can assume that the number of colours in system doesn't change during application's lifetime
• Hints:
  • GetClientRect()
  • LoadImage()
  • CreatePatternBrush(), FillRect()
  • PolyBezier(), MoveToEx(), LineTo()
  • BeginPath(), EndPath(), FillPath()
  • SetCapture(), ReleaseCapture()
  • CreateCompatibleDC(), CreateCompatibleBitmap(), SelectObject(), DeleteObject()
  • BitBlt()
  • WM_ERASEBKGND

• Approximate points:
  • drawing water: 1.5
  • drawing sky: 1.5
  • drawing points: 1.0
  • drawing Bezier's curve: 2.0
  • separation water from sky according to the curve: 1.5
  • moving points: 1.0
  • no flickering: 1.5