using Huanent.Printer.Models;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Printing;
using System.Text;
using System.Linq;
namespace PrintCore
{
public class Printer : IPrinter
{
#region fields
PrintDocument _printDoc = new PrintDocument();
/// <summary>
/// 打印对象打印宽度(根据英寸换算而来,paperWidth * 3.937)
/// </summary>
readonly int _paperWidth;
const float _charProportion = 0.7352f;
const float _lineHeightProportion = 1.6f;
const string _fontName = "SimHei";
IList<Action<Graphics>> _printActions = new List<Action<Graphics>>();
/// <summary>
/// 当前的打印高度，当调用换行或者图片打印时会增加此字段值
/// </summary>
float _currentheight = 0;
float NewLineOffset { get; set; } // = (int)FontSize.Normal * _lineHeightProportion;
#endregion
#region ctor
/// <summary>
/// 初始化机打印对象
/// </summary>
/// <param name="PrinterName">打印机名称</param>
/// <param name="paperWidth">打印纸宽度</param>
/// <param name="paperHight">打印纸高度</param>
internal Printer(string PrinterName, double paperWidth, int paperHight)
{
//3.937为一个打印单位(打印单位:80(实际宽度72.1),58（实际宽度48）)
_paperWidth = Convert.ToInt32(Math.Ceiling(paperWidth * 3.937));
_printDoc.PrinterSettings.PrinterName = PrinterName;
_printDoc.PrintPage += PrintPageDetails;
_printDoc.DefaultPageSettings.PaperSize = new PaperSize("", _paperWidth, paperHight);
_printDoc.PrintController = new StandardPrintController();
}
#endregion
#region eventHandler
void PrintPageDetails(object sender, PrintPageEventArgs e)
{
foreach (var item in _printActions)
{
item(e.Graphics);
}
}
#endregion
#region IPrinterImplement
public void NewRow()
{
_printActions.Add((g) =>
{
_currentheight += NewLineOffset;
NewLineOffset = (int)FontSize.Normal * _lineHeightProportion;
});
}
public void PrintText(string content, FontSize fontSize = FontSize.Normal, StringAlignment stringAlignment = StringAlignment.Near, float width = 1, float offset = 0)
{
int rowNum = 0;
_printActions.Add((g) =>
{
float contentWidth = width == 1 ? _paperWidth * (1 - offset) : width * _paperWidth;
string newContent = ContentWarp(content, fontSize, contentWidth, out rowNum);
var font = new Font(_fontName, (int)fontSize, FontStyle.Regular);
var point = new PointF(offset * _paperWidth, _currentheight);
var size = new SizeF(contentWidth, (int)fontSize * _lineHeightProportion * rowNum);
var layoutRectangle = new RectangleF(point, size);
var format = new StringFormat
{
Alignment = stringAlignment,
FormatFlags = StringFormatFlags.NoWrap
};
g.DrawString(newContent, font, Brushes.Black, layoutRectangle, format);
float thisHeightOffset = rowNum * (int)fontSize * _lineHeightProportion;
if (thisHeightOffset > NewLineOffset) NewLineOffset = thisHeightOffset;
});
}
public void Finish()
{
_printDoc.Print();
_printDoc.Dispose();
_printDoc = new PrintDocument();
_printActions.Clear();
}
public void PrintImage(Image image, StringAlignment stringAlignment = StringAlignment.Near)
{
_printActions.Add((g) =>
{
int x = 0;
switch (stringAlignment)
{
case StringAlignment.Near:
break;
case StringAlignment.Center:
x = (_paperWidth - image.Width) / 2;
break;
case StringAlignment.Far:
x = _paperWidth - image.Width;
break;
default:
break;
}
var point = new Point(x, Convert.ToInt32(_currentheight));
var size = new Size(image.Width, image.Height);
var rectangle = new Rectangle(point, size);
g.DrawImage(image, rectangle);
NewLineOffset = image.Height;
});
}
public void PrintLine(FontSize fontSize = FontSize.Normal)
{
int charNum = (int)(_paperWidth / ((int)fontSize * _charProportion));
var builder = new StringBuilder();
for (int i = 0; i < charNum; i++)
{
builder.Append('-');
}
PrintText(builder.ToString(), fontSize, StringAlignment.Center);
}
#endregion
#region methods
/// <summary>
/// 对内容进行分行，并返回行数
/// </summary>
/// <param name="content">内容</param>
/// <param name="fontSize">文字大小</param>
/// <param name="width">内容区宽度</param>
/// <returns>行数</returns>
static string ContentWarp(string content, FontSize fontSize, float width, out int row)
{
content = content.Replace(Environment.NewLine, string.Empty);
//0.7282 字符比例
var builder = new StringBuilder();
float nowWidth = 0;
row = 1;
foreach (char item in content)
{
int code = Convert.ToInt32(item);
float charWidth = code < 128 ? _charProportion * (int)fontSize : _charProportion * (int)fontSize * 2;
nowWidth += charWidth;
if (nowWidth > width)
{
builder.Append(Environment.NewLine);
nowWidth = charWidth;
row++;
}
builder.Append(item);
}
return builder.ToString();
}
#endregion
}
}
