Re: [platform-swt-dev] Using Alpha with Patterns

[Arnaud De Muyser <ademuyser@xxxxxxxxxx>]

Pattern(Device, float, float, float,
float, Color, int, Color, int)  constructor is not able to set start
or end alpha value,
nor Pattern(Device,Image) is able to
apply an alpha to the Pattern.

I'm agree with Randy, if GC's alpha
is set to 50%, any pattern used to fill or to draw must be rendered using
50% transparency.
I'm not able to test this feature on
linux nor mac, does someone have tested this ?

Thanks,
Arnaud.

Silenio Quarti <Silenio_Quarti@xxxxxxxxxx>
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11/01/2005 05:06 PM

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Subject	Re: [platform-swt-dev] Using Alpha with Patterns

I believe the alpha value of the GC does not affect the pattern on Windows
and GTK (not sure about 
the Mac). Please open a bug report so that we can check/make this consistent
between platforms. 

Silenio

Randy Hudson <hudsonr@xxxxxxxxxx>
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10/31/2005 10:23 PM

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Subject	Re: [platform-swt-dev] Using Alpha with Patterns

I think the point is that a normal (opaque) pattern should be 50% transparent
when the entire GC is set to 50%. Is this not what happens on other platforms?

Silenio Quarti <Silenio_Quarti@xxxxxxxxxx>
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10/31/2005 01:52 PM

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Subject	Re: [platform-swt-dev] Using Alpha with Patterns

This feature was just added after SWT 3.1 shipped. See Pattern(Device,
float, float, float, float, Color, int, Color, int). You can
specify a alpha value for the start and end colors.

Silenio

Arnaud De Muyser <ademuyser@xxxxxxxxxx>
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10/28/2005 12:09 PM

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Subject	[platform-swt-dev] Using Alpha with Patterns

Hi, 
I'm trying new SWT 3.1 GC features, incredible, a real big step for graphics
! 
When I use alpha (setAlpha(100) for example) and use a background or foreground
pattern, 
pattern is drawn without using current transparency value (I create pattern
with png and jpeg images). 

How can I paint patterns using alpha transparency ?

Thanks for your help. 

Arnaud._______________________________________________
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