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List:       koffice-devel
Subject:    [flake] Unit based flakes
From:       Thomas Zander <zander () kde ! org>
Date:       2006-04-29 9:38:04
Message-ID: 200604291138.10640.zander () kde ! org
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This is a status update as I think this is a significant step forward for 
Flake.

Remember how we spoke about flake being pixel based? Well, no more!
From now on all measurements in flake (like position and size etc) are in 
postscript-points. Which is a unit just like meters is.

The commit in question;
SVN commit 535304 by zander:
This commit converts the internal format of KoShape to not be pixel based 
anymore, but to be based on postscript-points. This means that a 50pt 
wide box will now have the same width on screen for everybody (1.76 cm).

This has added some (needed) complexity to the paint methods. Which 
extending objects will naturally see since they have to implement the 
paint.
I chose to not use painter-based scaling since thats not always the right 
thing to do. You can imagine an application showing at zoom 30% and all 
the borders dissapearing because they are too thin. Not fun.
So, what I did was leave the choice up to the extending class. If you have 
an Image-flake shape; the you can simply use Painter based scaling by 
calling:
	
void Image::paint(QPainter &painter, KoViewConverter &converter) {
    applyConversion(painter, converter);
    // do rest in units of the shape itself, no conversions needed!
}

If you, on the other hand, need to do your painting more accurately 
including stuff like cliprects and all; then you can use the converter 
API. Like this one: (taken from KoRectangleShape)
    painter.drawRect( converter.normalToView(QRectF( 0, 0, 
	size().width(), size().height() ) ));

I'll be updating the API docs soon. (I always wait half a day so I don't 
fall in the trap of describing the wrong thing; the implementation while 
you should have been describing the usage).
-- 
Thomas Zander

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