caption.cs

用C#编写的一个新的打印程序

using System;
using System.Drawing;

namespace GoldPrinter
{
	/// <summary>
	/// 子标题
	/// 
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	///★★★★★您可以免费使用此程序，但是请您保留此说明，以维护知识产权★★★★★
	/// </summary>
	public class Caption:Printer
	{
		private string _text;			//文本
		private int _maxRows;			//限制行数
		private bool _hasborder;		//画边框

		/// <summary>
		///  默认构造函数
		/// </summary>
		public Caption()
		{	
			//初始值
			_text = "";
			_maxRows = 1;
			_hasborder = false;
			this.Font = new Font("宋体",13,FontStyle.Italic);		//字体

			this.IsDrawAllPage = true;
		}

		/// <summary>
		/// 子标题构造函数
		/// </summary>
		/// <param name="text"></param>
		public Caption(string text):this()
		{
			this._text = text;
		}

		public string Text
		{
			get{return this._text;}
			set{this._text = value;}
		}	

		public bool HasBorder
		{
			get{return this._hasborder;}
			set{this._hasborder = value;}
		}	

		/// <summary>
		/// 限制行数，小于0为不限制
		/// </summary>
		public int MaxRows
		{
			get{return this._maxRows;}
			set{this._maxRows = value;}
		}	

		public override void Draw()
		{
			base.Draw();

			//绘图起始座标及字符串的宽与高
			float x,y;
			x = this.PrinterMargins.X1;
			y = this.PrinterMargins.Y1;			

			//相对移动
			x += this.MoveX;
			y += this.MoveY;

			
			//测量字符串尺寸是否过量
			float width = this.PrinterMargins.Width;	//用最宽使居中	//this.TextWidth(this._text);	//获取文本的宽，最宽不会超过有效打印页的宽
			float height = this.TextHeight(this._text);	//获取文本的高，测量基宽为有效打印页的宽

			//不能超过最高
			if (height > this.PrinterMargins.Height)
			{
				height = this.PrinterMargins.Height;
			}

			//限制行数
			if (this._maxRows > 0)
			{
				if (height > this.Font.Height * _maxRows)
				{
					height = this.Font.Height * _maxRows;
				}
			}
           
			//文本的高测量基宽为有效打印页的宽，因此会根据实际字符自动换行
			RectangleF recF = new RectangleF(x,y,width,height);
            

			StringFormat sf = new StringFormat();

			sf.Alignment = StringAlignment.Center;			//横向居中
			sf.LineAlignment = StringAlignment.Center;		//竖向居中

			#region	计算实际绘图区
			//写绘制时的坐标信息
			recF.X = (this.PrinterMargins.Width - this.TextWidth(this.Text))/2  + this.PrinterMargins.Left + this.MoveX;
			recF.Y = y;
			if (this.TextWidth(this.Text) < this.PrinterMargins.Width)
			{
				recF.Width = this.TextWidth(this.Text);		
			}
			else
			{
				recF.Width = this.PrinterMargins.Width;				
			}

			recF.Height = height;	

			this.RectangleF = recF;
			#endregion

			//画上打印有效区的线
			if (_hasborder)
			{
				this.Graphics.DrawRectangle(Pens.Black,this.RectangleF.X,this.RectangleF.Y,this.RectangleF.Width,this.RectangleF.Height);
			}

			//输出文本
			this.Graphics.DrawString(_text,this.Font,Brushes.Black,recF,sf);

			this.Height = height;
			
		}


	}//End Class
}//End NameSpace