Timage & AntialiasingMode
lazarus / 39-Graphics

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airpas · 2014-04-28 14:15

hi
does the (AntialiasingMode) property works in Timage ?
i set it to amOn but nothing changed ! . iam drawing on timage using (
timage.canvas.Line , Polygon .... )

lazarus 1.1 / fpc 2.7.1 / win7

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Blaazen · 2014-04-28 14:27

Don't know about Windows7 (I have only wine). It works in Qt but not
in GTK2. So it seems that this feature is platform-dependent.
Definitely, Canvas.Line(); is perfectly antialiased in Qt4 when I use
mode amOn.

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circular · 2014-04-28 14:57

Antialiasing mode does not work on Windows.

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taazz · 2014-04-29 00:02

The reason is that the Tcanvas is using GDI under the hood to draw and
GDI does not support anti-aliased mode for graphics. you need to use a
different engine eg GDI+ or use the aggpas library that comes with
lazarus for painting on a buffer and copy that buffer to the image
afterwards, although I think that there is a rasterizer for tbimaps
included with aggpas.

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circular · 2014-04-29 21:53

Or use my library BGRABitmap. An TBGRABitmap object has a property
CanvasBGRA, that provides the same function as TCanvas, except that
antialiasing always works.