using System;
using System.Drawing;

namespace Triangle
{
	/// <summary>
	/// Triangle 表示要繪制的三角形。記錄了這個三角形的三個頂點。
	/// </summary>
	public class Triangle
	{
		/// <summary>
		/// 構造函數，應傳入三角形的三個項點。
		/// </summary>
		/// <param name="pt1">三角形的第一個頂點。</param>
		/// <param name="pt2">三角形的第二個頂點。</param>
		/// <param name="pt3">三角形的第三個頂點。</param>
		public Triangle(Point pt1, Point pt2, Point pt3)
		{
			point1 = pt1;
			point2 = pt2;
			point3 = pt3;
		}

		private Point point1;
		private Point point2;
		private Point point3;

		/// <summary>
		/// 繪制三角形。
		/// </summary>
		/// <param name="dc">繪制的圖片對象。</param>
		/// <param name="pen">繪制使用的鋼筆。</param>
		public void Draw(Graphics dc, Pen pen)
		{
			dc.DrawLine(pen, point1, point2);
			dc.DrawLine(pen, point2, point3);
			dc.DrawLine(pen, point3, point1);
		}
	}
}