dotnet drawing api: Antialias Matrix transformation? -- dotnet drawing api

Antialias Matrix transformation?

Nik Coughlin
1/22/2007 2:30:49 PM

dotnet drawing api:

Does anyone know a way around this? Do I need to write my own transform
code?

It appears that SmoothingMode doesn't apply to matrix transformations (in my
case shear). The following code produces shearing with ugly stepping:

viewPort.Graphics.SmoothingMode = SmoothingMode.AntiAlias;

Matrix m = new Matrix( );
m.Shear( 0, testWall.Shear );
viewPort.Graphics.MultiplyTransform( m );

viewPort.Graphics.DrawImage( testTexture, new Rectangle(
new Point( testWall.Start.X, testWall.Start.Y ),
new Size( newXSize, newYSize ) ) );

Re: Antialias Matrix transformation?

Bob Powell [MVP]
1/24/2007 9:21:19 PM

SmoothingMode doesn't affect images. Use InterpolationMode instead.
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[quoted text, click to view]

Re: Antialias Matrix transformation?

Nik Coughlin
1/25/2007 9:47:14 AM

[quoted text, click to view]

You're quite right, unfortunately though InterpolationMode doesn't seem to
affect the shear transform matrix either:

http://nrkn.com/temp/sheared.png

In fact, it looks like that whether I use InterpolationMode or not. Some
edges are aliased, some anti-aliased (Note the bottom edge of the rightmost
wall.

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