Hi Michael,
[EMAIL PROTECTED] wrote on 10/15/2008 10:05:08 PM:
> The problem was in the calculation of the derived transform.
> You should use preConcatenate instead of concatenate in
If you do this then you can use the following to
avoid setting the viewing transform to identity:
AffineTransform vt =
targetCanvas.getCanvasGraphicsNode().getViewingTransform();
AffineTransform ivt = vt.createInverse();
derivedTx.concatenate(ivt);
targetCanvas.setRenderingTransform(derivedTx);
I think this matches your commented out code.
I'll say it makes me nervous to reset the viewing
transform as some changes to the document could reset
the viewing transform which would obviously cause
problems.
> public static AffineTransform deriveTransform(
> Point2D[] srcPoints, Point2D[] destPoints);
>
> Replace:
> returnTransform.concatenate(destTransform);
>
> With:
> returnTransform.preConcatenate(destTransform);
>
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> > Sent: Wed 10/15/2008 6:29 AM
> > To: [email protected]
> > Subject: RE: Tracking changes to the rendering transform?
> >
> >
> >
> > Hi Michael,
> >
> > "Bishop, Michael W. CONTR J9C880" <[EMAIL PROTECTED]>
> > wrote on 10/14/2008 03:40:05 PM:
> >
> > > Similar results; it seems the first row is correct and the second
> > > row has numbers out of order. Visually, the result is better, the
> > > closer I have the zoom interactor to the top-left of the screen. If
> > > I drag a box near the top left of the source canvas, it's close.
> > > The further I get from the top-left, the more wrong it is. It seems
> > > translation doesn't get applied properly, the target canvas is
> > > always anchored to the upper-left of the document, regardless of the
> > > source canvas's view. The scaling is usually close.
> >
> > So does your window -> viewBox mapping code give the same
> > results on the destination canvas as it did on the source canvas
> > after you have set the renderingTransform?
> >
> > My guess is not which means that the rendering transform wasn't
> > properly calculated some how.
> >
> > BTW given that your canvas is 200x200 and the document is
> > 640x480 it is expected that window 0,0 could map to a negative
> > Y value (480*200/640 give a scaled height of only 150 for the
> > document which means that there will be 25 pixels on the top
> > and bottom which are 'outside' of the document viewBox).
> >
> > > Target Screen CTM: [ 0.312 0 0 0.312 0 0.125 ]
> > > Target view box transform: AffineTransform[[0.3125, 0.0, 0.0], [0.
> > 0, 0.3125, 0.125]]
> >
> > These transforms look a lot like the default scaling transform
> > 200/640 = .3125 So I'm surprised that they are your source
> canvas'stransform
> > after using the zoom interactor.
> >
> > BTW your code never made it as an attachment.
> > [attachment "winmail.dat" deleted by Thomas E. DeWeese/449433/EKC]
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