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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