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What's the difference, RGB vs Color [message #466412]

Tue, 10 January 2006 12:33

Johnson

Messages: 13
Registered: July 2009

Junior Member

SWT provides these 2 packages, I can not see the difference when using them.
org.eclipse.swt.graphics.Color
org.eclipse.swt.graphics.RGB

What are the differences of these 2 packages? And they should be used under
what conditions? Thanks

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Re: What's the difference, RGB vs Color [message #466418 is a reply to message #466412]

Tue, 10 January 2006 13:49

Alex Blewitt

Messages: 946
Registered: July 2009

Senior Member

The Color is the actual object that will be used when rendering widgets. It has handles to operating system resources, and generally should be cached where possible using a map or similar. They must be dispose()d of after use (because they have OS resources).

An RGB, on the other hand, is merely a set of 3 numbers (red, green, blue values). It's used to specify a particular color (like 0,255,0 = blue; 255,0,0 = red etc.). You can create a Color object once you have an RGB value of what colour you want to use.

It's not necessary to create an RGB, because there's a constructor in Color that takes individual red, green and blue values. Whenever you obtain the RGB out of a Colour, it creates a new RGB instance to hold that data in, so one of the only reasons for having the RGB is that it is something that can be easily written to preferences files to denote what colour is required, and then to use it to obtain a Color instance when running.

Alex.

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Re: What's the difference, RGB vs Color [message #466522 is a reply to message #466412]

Tue, 10 January 2006 22:14

MANMOHAN GUPTA

Messages: 8
Registered: July 2009

Junior Member

"Johnson" <ljshuenn@realtek.com.tw> wrote in message
news:dq09if$gao$1@utils.eclipse.org...
> SWT provides these 2 packages, I can not see the difference when using
them.
> org.eclipse.swt.graphics.Color
> org.eclipse.swt.graphics.RGB
>
> What are the differences of these 2 packages? And they should be used
under
> what conditions? Thanks
>
>

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