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using System;
using System.Drawing;
using System.Windows.Forms;
class Bezier: Form
{
protected Point[] apt = new Point[4];
public static void Main()
{
Application.Run(new Bezier());
}
public Bezier()
{
ResizeRedraw = true;
OnResize(EventArgs.Empty);
}
protected override void OnResize(EventArgs ea)
{
base.OnResize(ea);
int cx = ClientSize.Width;
int cy = ClientSize.Height;
apt[0] = new Point( cx / 4, cy / 2);
apt[1] = new Point( cx / 2, cy / 4);
apt[2] = new Point( cx / 2, 3 * cy / 4);
apt[3] = new Point(3 * cx / 4, cy / 2);
}
protected override void OnMouseDown(MouseEventArgs mea)
{
Point pt;
if (mea.Button == MouseButtons.Left)
pt = apt[1];
else if (mea.Button == MouseButtons.Right)
pt = apt[2];
else
return;
Cursor.Position = PointToScreen(pt);
}
protected override void OnMouseMove(MouseEventArgs mea)
{
if (mea.Button == MouseButtons.Left)
{
apt[1] = new Point(mea.X, mea.Y);
Invalidate();
}
else if (mea.Button == MouseButtons.Right)
{
apt[2] = new Point(mea.X, mea.Y);
Invalidate();
}
}
protected override void OnPaint(PaintEventArgs pea)
{
Graphics grfx = pea.Graphics;
grfx.DrawBeziers(new Pen(ForeColor), apt);
Pen pen = new Pen(Color.FromArgb(0x80, ForeColor));
grfx.DrawLine(pen, apt[0], apt[1]);
grfx.DrawLine(pen, apt[2], apt[3]);
}
}
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