直线显示和打印

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(一)画直线

画笔定义:Pen pen=Pen(clr);或Pen pen=Pen(clr,width);

可以通过Width 来定义画笔的宽度.

pen.Width=2;

画笔的最小宽度是1,既是说pen.Width=0;而实际画出来的线条还是1.

Graphics. DrawLine(pen,0,0,x,y);是画包括,(0,0)和(x,y)在内的一些点.对于Win32API画线时不包括(x,y)

(二) 打印

PrintDocument对象.

DocumentName 属性是文本字符串,是文本输入到假脱打印机对话筐中标识这一任务的文字.

PrintDocumentOnPrintPage(Object obj,PrintPageEventArgs e)事件中对具体打印进行设置

PrintPageEventArgs的HasMorePage为true 表示打印多页,为false表示打印单页.

打印机的整个页面由三个不同区域定义.

1,整个页面大小由PrintPageEventArgs的PageBounds属性提供

2,页面可打印区.等于整个页面去掉打印头,不能到达的页边空白. Graphics的 VisibleClipBounds

属性提供了页面可打印区的大小.

3,第三区是页面上4个角保留1英寸的打印空白.可以通过PrintPageEventArgs的MarginBounds属性得到.

using System;

using System.Drawing ;

using System.Drawing.Printing ;

using System.Windows.Forms ;

namespace WindowsProgram

{ class PrintTableForm:Form

{ static void Main(string[] args)

{

Application.Run(new PrintTableForm());

}

public PrintTableForm()

{ Text="Print Table Form";

BackColor=SystemColors.Window ;

ForeColor=SystemColors.WindowText;

ResizeRedraw=true;

}

protected override void OnPaint(PaintEventArgs e)

{

DoPage(e.Graphics,ForeColor,ClientSize.Width,ClientSize.Height);

}

void PrintDocumentOnPrintPage(Object obj,PrintPageEventArgs e)

{ Graphics grs=e.Graphics ;

SizeF sizef=grs.VisibleClipBounds.Size;

DoPage(grs,ForeColor,(int)sizef.Width,(int)sizef.Height);

}

protected override void OnClick(EventArgs ea)

{ PrintDocument pdt=new PrintDocument();

pdt.DocumentName=Text;

pdt.PrintPage +=new PrintPageEventHandler(PrintDocumentOnPrintPage);

pdt.Print();

}

protected virtual void DoPage(Graphics grs,Color clr,int cx,int cy)

{ Pen pen=new Pen(clr);

grs.DrawLine(pen,0,0,cx-1,cy-1);

grs.DrawLine(pen,cx-1,0,0,cy-1);

}

(三) 图象保真.

Graphics类的SmoothingMode线条保真.其确省是无图象保真.当设置图象保真后,远看线条平滑滑,近看线条有些乱.

Graphics类的PixelOffsetMode增强保真,既象素偏移.,设置后将向上偏移半个象素.

例:

using System;

using System.Drawing ;

using System.Drawing.Printing ;

using System.Windows.Forms ;

using System.Drawing.Drawing2D ;

namespace WindowsProgram

{ class AntiAlies:Form

{ static void Main(string[] args)

{

Application.Run(new AntiAlies());

}

public AntiAlies()

{ Text="Anti Alins";

BackColor=SystemColors.Window ;

ForeColor=SystemColors.WindowText;

ResizeRedraw=true;

}

protected override void OnPaint(PaintEventArgs e)

{ Graphics grs=e.Graphics;

Pen pen=new Pen(ForeColor);

grs.SmoothingMode =SmoothingMode.HighQuality;

grs.PixelOffsetMode=PixelOffsetMode.HighQuality ;

grs.DrawLine(pen,2,2,18,10); }

}}

(三) 图象保真.

Graphics类的SmoothingMode线条保真.其确省是无图象保真.当设置图象保真后,远看线条平滑滑,近看线条有些乱.

Graphics类的PixelOffsetMode增强保真,既象素偏移.,设置后将向上偏移半个象素.

例:

using System;

using System.Drawing ;

using System.Drawing.Printing ;

using System.Windows.Forms ;

using System.Drawing.Drawing2D ;

namespace WindowsProgram

{ class AntiAlies:Form

{ static void Main(string[] args)

{

Application.Run(new AntiAlies());

}

public AntiAlies()

{ Text="Anti Alins";

BackColor=SystemColors.Window ;

ForeColor=SystemColors.WindowText;

ResizeRedraw=true;

}

protected override void OnPaint(PaintEventArgs e)

{ Graphics grs=e.Graphics;

Pen pen=new Pen(ForeColor);

grs.SmoothingMode =SmoothingMode.HighQuality;

grs.PixelOffsetMode=PixelOffsetMode.HighQuality ;

grs.DrawLine(pen,2,2,18,10); }

}}

(三) 多重连接直线.

使用 Graphics.DrawLines(new Pen(clr),pt);

using System;
using   System.Drawing ;
using System.Drawing.Printing ;
using System.Windows.Forms ;
namespace WindowsProgram
{
  class BoxingPoint:PrintTableForm
{
   static void Main(string[] args)
  {
   Application.Run(new BoxingPoint());
  }
  public BoxingPoint()
  {
   Text="Boxing Point the Clinet";

  }
  protected override void DoPage(Graphics grs,Color clr,int cx,int cy)
  {
   Point[] pt={new Point(0,0), new Point(cx-1,0),new Point(cx-1,cy-1), new Point(0,cy-1),new Point(0,0)};

   grs.DrawLines(new Pen(clr),pt);
  }

}
}