17 C 编程学习—— 贝塞尔曲线

               

17.C#编程学习—— 贝塞尔曲线

源码

usingSystem;

usingSystem.Drawing;

usingSystem.Windows.Forms;

 

classBezier :Form

{

   protectedPoint[] apt =newPoint[4];

 

   publicstaticvoid Main()

    {

       Application.Run(newBezier());

    }

   public Bezier()

    {

        Text ="Bezier (Mouse Defines Control Points)";

        BackColor =SystemColors.Window;

        ForeColor =SystemColors.WindowText;

        ResizeRedraw =true;

 

        OnResize(EventArgs.Empty);

    }

   protectedoverridevoid OnResize(EventArgs ea)

    {

       base.OnResize(ea);

 

       int cx = ClientSize.Width;

       int cy = ClientSize.Height;

 

        apt[0] =newPoint(cx / 4, cy / 2);

        apt[1] =newPoint(cx / 2, cy / 4);

        apt[2] =newPoint(cx / 2, 3 * cy / 4);

        apt[3] =newPoint(3 * cx / 4, cy / 2);

    }

   protectedoverridevoid OnMouseDown(MouseEventArgs mea)

    {

       Point pt;

 

       if (mea.Button ==MouseButtons.Left)

            pt = apt[1];

 

       elseif (mea.Button ==MouseButtons.Right)

            pt = apt[2];

 

       else

           return;

 

       Cursor.Position = PointToScreen(pt);

    }

   protectedoverridevoid OnMouseMove(MouseEventArgs mea)

    {

       if (mea.Button ==MouseButtons.Left)

        {

            apt[1] =newPoint(mea.X, mea.Y);

            Invalidate();

        }

       elseif (mea.Button ==MouseButtons.Right)

        {

            apt[2] =newPoint(mea.X, mea.Y);

            Invalidate();

        }

    }

   protectedoverridevoid OnPaint(PaintEventArgs pea)

    {

       Graphics grfx = pea.Graphics;

 

        grfx.DrawBeziers(newPen(ForeColor),apt);

 

       Pen pen =newPen(Color.FromArgb(0x80, ForeColor));

 

        grfx.DrawLine(pen, apt[0], apt[1]);

        grfx.DrawLine(pen, apt[2], apt[3]);

    }

}

 

 

           

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