GDI+

Version B

Splines

• Demonstration
• Functionality:
  • draw curve using points set by the user
    • selected point drawn as red rectangle
    • points drawn as green rectangles
    • splines drawn using white pen with width set in menu
  • user interface:
    • Left mouse button click - adds new point
    • Left mouse button drag - moves selected point
    • Delete key - removes the last point
    • Escape - removes all points
• settings of drawing, available in menu (use checkmarks as in the demonstration):
  • Bezier or cardinal splines
    • Bezier splines will be visible when the number of points is 4, 7, 10, 13, 16 etc.
  • using antialiasing
  • width of pen for drawing splines (values: 1.0, 5.0, 10.0)
  curve tension for drawing cardinal splines (values: 0.0, 0.5, 1.0, 2.0, 5.0)
• Technical requirements:
  • scale the scene properly after window's resizing
  • do not let to flicker (during drawing, moving the point and resizing the window)
  • maximum number of points: 2000
• Hints:
  • Bitmap class
  • Graphics methods:
    • FromImage(), DrawImage(),
    • ScaleTransform(), TransformPoints()
    • DrawCurve(), DrawBeziers(), DrawRectangle(),
    • SetSmoothingMode()
  • CheckMenuItem(), CheckMenuRadioItem()

• Approximate points:
  • drawing, mouse and keyboard processing: 3.0
  • scaling the scene: 2.5
  • no flickering: 2.5
  • changing settings: 2.0