trinagle.cs

CSharp的MDI窗口事例

using System;
using System.Drawing;

namespace MDICSharp
{
	[Serializable]
	public class Triangle : MDICSharp.Shape
	{
		public Triangle(Point st, Point ep)
		{
			StartPoint = st;
			EndPoint = ep;
		} // constructor
		public override void DrawShape(Graphics dc, Pen drawPen, Brush brush)
		{
			Rectangle drawArea;
			Size rectSize = new Size((EndPoint.X - StartPoint.X), (EndPoint.Y - StartPoint.Y));
			drawArea = new Rectangle(StartPoint, rectSize);
			Brush b =  new SolidBrush(Color.Red);
			Point[] pt;
			pt = new Point[4];
			
			pt[0].X = pt[3].X = EndPoint.X;
			pt[0].Y = pt[3].Y = EndPoint.Y;
			
			pt[1].X = StartPoint.X + rectSize.Width/2;
			pt[1].Y = StartPoint.Y;
			
			pt[2].X = StartPoint.X;
			pt[2].Y = EndPoint.Y;

			dc.DrawPolygon(drawPen, pt);
			dc.FillPolygon(brush, pt);
		
			
		}
	}
}