I've already done what I wanted to do: Transform among screen coordinates and world coordinates (and back) using the code:
-- AffineTransform world2screen = RendererUtilities.worldToScreenTransform(mapContext.getLayerBounds(), new Rectangle(panelMap.getWidth(), panelMap.getHeight())); AffineTransform screen2world = world2screen.createInverse(); Point2D pointScreen = screen2world.transform(pointScreenAbsolute, null); -- I understand that the whole manual page is focused to explain the last point[1] and if I read the whole page to the end I understand that the first example is to show users the _not so_ right way to get x,y axis. But If a programmer that is beginning with GeoTools (like me) read there howto get screen to world coordinates he will end thinking "Oh shit I don't know how to get this variable, this method params do not match" and stop reading. And if he finally get the transform he will end with Long/Lat in UTM and ignorant in how to transform UTM to Long/Lat in a geographic coordinate system (spherical coordinate system) in degrees (If you know the answer to this question please please send it to me). With this I'm trying to explain why I think that the _working_ examples in the user manual are very important, and if the example is vague because is only a waypoint to explain another thing I think (always IMHO, I thank you guys infinitely for the great work of creating GeoTools) that a link to a working example must be provided. If you show me the user manual guidelines I will be glad to document carefully the things I achieve in the progress of my project. Thanks! [1] http://docs.codehaus.org/display/GEOTDOC/04+What+Axis+is +X#04WhatAxisisX-LookinguptherightAxis On jue, 2008-01-17 at 18:49 -0800, Jody Garnett wrote: > Can we chat for a second about what you are wanting out of this example? > > Having a look at it this is an example of the referencing module; so the > point of the page is to ask people to trust (and use!) the coordinate > reference system "metadata". Rather than just assuming new Point2D( > position.getOrdinate( 0 ), position.getOrdinate( 1 ) ). > > Do you actually want to transform screen to Lat/Long? > data - is unknown > world - is this Lat/Long for you > screen - is based on the view port model or some kind of world2screen > transformation used by the renderer > > Jody > > > I'm going to try fixing the example after dinner. > > > > On Thu, January 17, 2008 17:48, Jody Garnett wrote: > > > >> I have updated that page with your code example: > >> http://docs.codehaus.org/display/GEOTDOC/04+What+Axis+is+X > >> > >> Were you able to spot the error in the original instructions or should I > >> just remove them? > >> > >> > > > > > > > -- Diego Fdez. Durán <[EMAIL PROTECTED]> | http://www.goedi.net GPG : 925C 9A21 7A11 3B13 6E43 50DB F579 D119 90D2 66BB
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