Hi Michael,
"Bishop, Michael W. CONTR J9C880" <[EMAIL PROTECTED]> wrote on
10/19/2005 10:13:49 AM:
> Sure, I don't give the users the ability to rotate text (yet) so that's
> no problem. On my glass pane, I call Graphics2D.setFont(...) and
> Graphics2D.drawString(...) to render the text. To transform to an
> Element, I manually create the tag information, including font-family,
> font-weight, font-style, and font-size. So if the user has 18pt font
> chosen, I can use the AffineTransform.getScaleY() to change the point
> size? That makes sense, but what about the width?
Well unless you are allowing for non-uniform scaling (different
X & Y scaling, square becomes a rectangle) then setting the font-size
will change the width correctly as well. If you want to allow for
non-uniform scaling then you will have to use the transform attribute
(there are a bunch of different forms, check the SVG spec for details).
> I'm still shooting for having what you see on the glass pane mirror
> what you see when you draw to the document.
Sure this shouldn't be an issue.
>
> Michael Bishop
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, October 19, 2005 10:08 AM
> To: [email protected]
> Cc: [email protected]
> Subject: RE: AW: Translations with zoom in and zoom out?
>
> Hi Michael,
>
> If you are willing to ignore rotation you can get the X/Y scale from
> the viewBox Affine Transform
> (AffineTransform.getScaleX(), AffineTransform.getScaleY()), these can
> then
> be used to scale the
> font-size for example.
>
> You could also use the 'transform' attribute with a 'matrix(...)' to
> directly apply the inverse viewBox
> transform to the text, which would allow you to 'skip' the mapping of
> the
> x & y coords (although at
> some loss to the readability of the SVG).
>
> "Bishop, Michael W. CONTR J9C880" <[EMAIL PROTECTED]> wrote on
>
> 10/19/2005 09:53:13 AM:
>
> > Yeah, this seems to do the trick for points. You lost me with
> > GeneralPath, but I currently create polylines with an ArrayList of
> > Point2D objects, so I can go from there and get the transform.
> >
> > Still stumped on fonts though; I can get the x,y coordinate to place
> the
> > font, but I'm not sure how to transform it properly in regards to a
> > zoomed JSVGCanvas.
> >
> > Michael Bishop
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> > Sent: Wednesday, October 19, 2005 5:36 AM
> > To: [email protected]
> > Subject: Re: AW: Translations with zoom in and zoom out?
> >
> > Hi all,
> >
> > Is there a reason you don't use the 'transform' methods that are
> > built
> > into
> > the AffineTransform class? These would seem to be much easier than
> all
> > of this:
> >
> > Point2D transform(Point2D ptSrc, Point2D ptDst)
> >
> > There are also a bunch that tack arrays of source and dst points,
> that
> > would probably be really useful for a polyline (BTW a polyline can be
> > done with GeneralPath, just use lineto commands).
> >
> > "Steiner, Dominik" <[EMAIL PROTECTED]> wrote on
> 10/19/2005
> > 02:57:07 AM:
> >
> > > Hi Michael,
> > >
> > > for converting a Point I do as follows:
> > >
> > > public static Float convertPointToViewBox(SVGCanvas canvas, Point
> > point) {
> > > try {
> > > AffineTransform viewBoxTranfrom =
> canvas.getViewBoxTransform();
> > > viewBoxTranfrom = viewBoxTranfrom.createInverse();
> > > return convertPoint(point, viewBoxTranfrom);
> > > } catch (NoninvertibleTransformException e) {
> > > e.printStackTrace();
> > > }
> > > return null;
> > > }
> > >
> > > private static Point2D.Float convertPoint(Point point,
> > AffineTransform
> >
> > > viewBoxTranfrom) {
> > > double[] matrix = new double[6];
> > > viewBoxTranfrom.getMatrix(matrix);
> > > return convertPoint(point, matrix);
> > > }
> > >
> > > public static Point2D.Float convertPoint(Point point,
> > > double[] matrix) {
> > > Point2D.Float retP = new Point2D.Float();
> > > retP.x = (float) (matrix[0] * point.x + matrix[2] * point.y +
> > matrix[4]);
> > > retP.y = (float) (matrix[1] * point.x + matrix[3] * point.y +
> > matrix[5]);
> > > return retP;
> > > }
> > >
> > > I hope this helps? J
> > >
> > > Dominik Steiner
> > >
> > >
> > > Von: Bishop, Michael W. CONTR J9C880
> > [mailto:[EMAIL PROTECTED]
> > > Gesendet: Dienstag, 18. Oktober 2005 19:02
> > > An: [email protected]
> > > Betreff: RE: Translations with zoom in and zoom out?
> > >
> > > Oops, forgot Line2D falls in the Shape category. For the text and
> the
> >
> > > polyline, I really have the same problem; the text is a single x,y
> > coordinate
> > > and the polyline is a set of x,y coordinates. If I can figure out
> how
> >
> > to
> > > translate those, I should be in good shape.
> > >
> > > Michael Bishop
> > >
> > >
> > > From: Bishop, Michael W. CONTR J9C880
> > [mailto:[EMAIL PROTECTED]
> > > Sent: Tue 10/18/2005 12:57 PM
> > > To: [email protected]
> > > Subject: RE: Translations with zoom in and zoom out?
> > > That is precisely what I needed. I was using JSVGCanvas.
> > > getRenderingTransform() and that didn't quite work. That works for
> my
> >
> > boxes
> > > and ellipses, but is there a similar school of thought, using the
> > > AffineTransform for Line2D, a set of points (later used to create a
> > polyline) and text??
> > >
> > > Michael Bishop
> > >
> > >
> > > From: Steiner, Dominik [mailto:[EMAIL PROTECTED]
> > > Sent: Tue 10/18/2005 7:46 AM
> > > To: [email protected]
> > > Subject: AW: Translations with zoom in and zoom out?
> > > Hi Michael,
> > >
> > > I?m not sure if this helps you, but I would suggest that you
> transform
> >
> > the
> > > screen coordinates to viewbox coordinates. I first let the user draw
> > on
> > screen
> > > coordinates and when he finished I do the transformation to viewbox
> > > coordinates as follows:
> > >
> > > public static Shape scaleShapeToViewbox(Shape shape, SVGCanvas
> > canvas)
> > {
> > > try {
> > > AffineTransform at =
> > canvas.getViewBoxTransform().createInverse();
> > > shape = at.createTransformedShape(shape);
> > > } catch (NoninvertibleTransformException e1) {
> > > e1.printStackTrace();
> > > }
> > > return shape;
> > > }
> > >
> > > So this works for my Java2D shapes?.
> > > I hope it helps?
> > >
> > > Dominik
> > >
> > > Von: Bishop, Michael W. CONTR J9C880
> > [mailto:[EMAIL PROTECTED]
> > > Gesendet: Montag, 17. Oktober 2005 20:44
> > > An: [email protected]
> > > Betreff: Translations with zoom in and zoom out?
> > >
> > > OK, so I have the JSVGCanvas zooming in and zooming out. Since I
> have
> > a
> >
> > > whiteboard application, users can draw objects to the canvas. Much
> > like
> >
> > > typical art programs, you get an ?outline? of what you?re going to
> > draw
> > before
> > > it?s placed. For a box, you click, drag the mouse to the desired
> size
> >
> > and
> > > release. I guess they call it ?rubber-banding? or whatever.
> > >
> > > On to my question. When the canvas is zoomed in/zoomed out, how can
> I
> >
> > get the
> > > translation correct on the glass pane? The glass pane is currently
> > drawing
> > > based on the coordinates of the JSVGCanvas, but it draws as if the
> > JSVGCanvas
> > > isn?t zoomed in or out. In short, what the glass pane is rendering
> is
> >
> > not
> > > zoomed, but what the JSVGCanvas is rendering is. So what you see
> > isn?t
> > what
> > > you get when you let go of the mouse. How can I translate my shapes
>
> > based on
> > > the zoom? If I draw something on a canvas that is zoomed in 20%,
> I?d
> > like to
> > > scale the outline 20%...etc. That degree of scaling is what I don?t
>
> > know how to get.
> > >
> > > Michael Bishop
> >
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