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 > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
