Monday, February 25, 2008

Creating a metafile in .NET

Metafiles are a way to save scalable vectory graphics. This blog creates a simple image containing a diagonal line. It also shows the proper way to save the metafile, as the class method saves it as a png file.

MSDN article on MetaFiles:

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;

MemoryStream metafileStream = new MemoryStream();

Graphics offScreenDC = Graphics.FromHwndInternal(IntPtr.Zero);

IntPtr myImagePointer = offScreenDC.GetHdc();

Metafile meta =
//new Metafile(myImagePointer, EmfType.EmfOnly); //unable to do memoryStreamSave
new Metafile(metafileStream, myImagePointer, EmfType.EmfOnly); //able to do memoryStreamSave

Graphics aGraphic = Graphics.FromImage(meta);

aGraphic.DrawLine(new Pen(Brushes.Black), new Point(0, 0), new Point(29, 29));

aGraphic.Dispose(); //Dispose must be called to flush the drawing instructions.

meta.Save(@"c:\metaSave.wmf"); //saves as a png file.

FileStream aWrite = new FileStream(@"c:\StreamSave.wmf",FileMode.Create); //saves as a wmf file



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