AW: Translations with zoom in and zoom out?

[Steiner, Dominik]

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: batik-users@xmlgraphics.apache.org 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: batik-users@xmlgraphics.apache.org 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: batik-users@xmlgraphics.apache.org 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: batik-users@xmlgraphics.apache.org 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