ExternalGraphic_GetBoundingBox
|
|
iceDice
|
Hello,
I have following situation: I read Points (geometry type) from Postgis, style them with SLD and render on JMapFrame. I use min and max scale denominator to draw points with external graphic with different size. What i need to know in every moment are SCREEN coordinates of external graphic (which is used in SLD), depending on current map scale. I need to get bounding box around external graphic in screen coordinates depending on map scale. This is because external graphic object is of different size for different map scales. What i have are world coordinates of center for every point. I am curious is it possible to get screen coordinates from world coordinates and current map scale? Also when we specify size of external graphic in SLD with <sld:Size></sld:Size> is it possible to get graphic height and width in pixels from it? I would appreciate if someone can help me about this issues. Best regards! |
||||||||||||||||
mbedward
|
> What i have are world coordinates of center for every point. I am curious is
> it > possible to get screen coordinates from world coordinates and current map > scale? mapFrame.getMapPane().getWorldToScreenTransform() is your friend Michael ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Geotools-gt2-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users |
||||||||||||||||
|
iceDice
|
Thanks Michael,
What about SLD and his way of styling data. Is it somehow possible to get width and height of graphic symbol in pixels on map? Say that we have .png image and that we define <sld:Size>100</sld:Size> to that image. Is it possible to know graphic height and width in pixels from that information? I need that because i want to catch mouse events when user enters and exits that graphic symbol and show some pop-up window with informations on mouse entered. Best regards. That helps me much. What i need to know in every moment are SCREEN coordinates of external graphic (which is used in SLD), depending on current map scale. I need to get bounding box around external graphic in screen coordinates depending on map scale. This is because external graphic object is of different size for different map scales. What i have are world coordinates of center for every point. I am curious is it possible to get screen coordinates from world coordinates and current map scale? Also when we specify size of external graphic in SLD with <sld:Size></sld:Size> is it possible to get graphic height and width in pixels from it?
|
Ian Turton
|
On Wed, Sep 23, 2009 at 2:47 PM, iceDice <[hidden email]> wrote:
> > Thanks Michael, > > What about SLD and his way of styling data. Is it somehow possible > to get width and height of graphic symbol in pixels on map? > Say that we have .png image and that we define <sld:Size>100</sld:Size> > to that image. Is it possible to know graphic height and width in pixels > from > that information? The width or height of the graphic will be 100px - if you are using a non square icon you'll need to check the code to see if the width or the height will be 100px as I forget which one is chosen. Ian -- Ian Turton ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Geotools-gt2-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users |
||||||||||||||||
Jody Garnett-2
|
In reply to this post
by iceDice
I know what you mean - it is a problem I have not solved yet for uDig.
We need to kind of consider what rules were used to render the image; in order to get the resulting hit area. My own approach that I think would be needed is to handle it in a similar manner to the label cache; run all graphics through a data structure (in order to prevent collisions) and use the same data structure to do the click lookup. If your graphics are all the same size (this is usual) create your query using the correct size when looking for the feature that was clicked on. Example - rendering points with 16x16 graphics. When the user clicks use screen2world on a pixel at (x-7,y-7) to (x+7,y+7). This would give you the bounds used to query your data set ... taking into account the size of the graphics. Jody On 24/09/2009, at 4:47 AM, iceDice wrote: > > Thanks Michael, > > What about SLD and his way of styling data. Is it somehow possible > to get width and height of graphic symbol in pixels on map? > Say that we have .png image and that we define <sld:Size>100</ > sld:Size> > to that image. Is it possible to know graphic height and width in > pixels > from > that information? > I need that because i want to catch mouse events when user enters > and exits > that graphic symbol and show some pop-up window with informations on > mouse > entered. > > Best regards. > > > > That helps me much. > What i need to know in every moment are SCREEN coordinates of external > graphic (which is used in SLD), depending on current map scale. I > need to > get bounding box around external graphic in screen coordinates > depending on > map scale. This is because external graphic object is of different > size for > different > map scales. > What i have are world coordinates of center for every point. I am > curious is > it > possible to get screen coordinates from world coordinates and > current map > scale? > Also when we specify size of external graphic in SLD with > <sld:Size></sld:Size> is > it possible to get graphic height and width in pixels from it? > > mbedward wrote: >> >>> What i have are world coordinates of center for every point. I am >>> curious >>> is >>> it >>> possible to get screen coordinates from world coordinates and >>> current map >>> scale? >> >> mapFrame.getMapPane().getWorldToScreenTransform() is your friend >> >> Michael >> >> ------------------------------------------------------------------------------ >> Come build with us! The BlackBerry® Developer Conference in SF, >> CA >> is the only developer event you need to attend this year. Jumpstart >> your >> developing skills, take BlackBerry mobile applications to market >> and stay >> ahead of the curve. Join us from November 9-12, 2009. Register >> now! >> http://p.sf.net/sfu/devconf >> _______________________________________________ >> Geotools-gt2-users mailing list >> [hidden email] >> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users >> >> > > -- > View this message in context: http://n2.nabble.com/ExternalGraphic-GetBoundingBox-tp3698425p3701620.html > Sent from the geotools-gt2-users mailing list archive at Nabble.com. > > ------------------------------------------------------------------------------ > Come build with us! The BlackBerry® Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart > your > developing skills, take BlackBerry mobile applications to market and > stay > ahead of the curve. Join us from November 9-12, 2009. Register > now! > http://p.sf.net/sfu/devconf > _______________________________________________ > Geotools-gt2-users mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Geotools-gt2-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users |
||||||||||||||||
|
iceDice
|
Hi Jody,
Moreover i have even worse situation. I need to show balloon tips over that graphic symbols. Problem is that balloon tip components that we have can be placed only over JComponent objects or something that is extended from it. I don't know how to access to those graphic symbols as objects, don't know if that is possible at all. Because of that i considering to dynamically create invisible JComponent objects over hitting area of every symbol and show balloon tips over it. To do that i will need to calculate hitting area considering screen coordinates of graphic center (which i can get from world coordinates that i have always in database) and size of graphic symbol in pixels (i can calculate width and height of symbol from current map scale because size of symbol is specified in SLD depending on scale denominators). However i am worried how this will work on performance and speed. Another approach will be to draw symbols on top of the map, independently from geotools renderer and SLD but that can also produce big problems as i consider that i should have all layers rendered by map. I would like to know what are you think about this and if you have some other ideas how to solve that problem. Best regards.
|
||||||||||||||||
|
Jody Garnett-2
|
Hi again.
The JMapPane is a JComponent .... You are thinking about this the wrong way around :-( The graphical symbols are part of the draw instructions; they define what is going to be rendered for you. It is like the letter "e" - you can that letter used in the "File" menu - but the same letter "e" will be used elsewhere around the screen. It is just a shape :-) With respect to balloon help you have a JComponent to start from; (indeed you can use the GeoTools renderer to produce an image for any kind of component you are working with). The problem will come down to what the user is hovering over; making a request to see what feature is at that location; and producing a balloon help based on that feature. If you really want objects you can go through your point data and read it into a series of objects like you describe; but there would be no need to render them (they would only be a data structure so you can ask what is at point x,y on the screen. Jody On 25/09/2009, at 4:52 AM, iceDice wrote: > > Hi Jody, > > Moreover i have even worse situation. > I need to show balloon tips over that graphic symbols. > Problem is that balloon tip components that we have can > be placed only over JComponent objects or something that > is extended from it. I don't know how to access to those > graphic symbols as objects, don't know if that is possible at all. > Because of that i considering to dynamically create invisible > JComponent > objects over hitting area of every symbol and show balloon tips over > it. > To do that i will need to calculate hitting area considering screen > coordinates > of graphic center (which i can get from world coordinates that i > have always > in database) and size of graphic symbol in pixels (i can calculate > width and > height of symbol from current map scale because size of symbol is > specified > in > SLD depending on scale denominators). However i am worried how this > will work on performance and speed. > Another approach will be to draw symbols on top of the map, > independently from geotools renderer and SLD but that can also produce > big problems as i consider that i should have all layers rendered by > map. > I would like to know what are you think about this and if you have > some > other ideas how to solve that problem. > > Best regards. > > > > Jody Garnett-2 wrote: >> >> I know what you mean - it is a problem I have not solved yet for >> uDig. >> We need to kind of consider what rules were used to render the image; >> in order to get the resulting hit area. My own approach that I think >> would be needed is to handle it in a similar manner to the label >> cache; run all graphics through a data structure (in order to prevent >> collisions) and use the same data structure to do the click lookup. >> >> If your graphics are all the same size (this is usual) create your >> query using the correct size when looking for the feature that was >> clicked on. >> >> Example - rendering points with 16x16 graphics. When the user clicks >> use screen2world on a pixel at (x-7,y-7) to (x+7,y+7). This would >> give >> you the bounds used to query your data set ... taking into account >> the >> size of the graphics. >> >> Jody >> >> On 24/09/2009, at 4:47 AM, iceDice wrote: >> >>> >>> Thanks Michael, >>> >>> What about SLD and his way of styling data. Is it somehow possible >>> to get width and height of graphic symbol in pixels on map? >>> Say that we have .png image and that we define <sld:Size>100</ >>> sld:Size> >>> to that image. Is it possible to know graphic height and width in >>> pixels >>> from >>> that information? >>> I need that because i want to catch mouse events when user enters >>> and exits >>> that graphic symbol and show some pop-up window with informations on >>> mouse >>> entered. >>> >>> Best regards. >>> >>> >>> >>> That helps me much. >>> What i need to know in every moment are SCREEN coordinates of >>> external >>> graphic (which is used in SLD), depending on current map scale. I >>> need to >>> get bounding box around external graphic in screen coordinates >>> depending on >>> map scale. This is because external graphic object is of different >>> size for >>> different >>> map scales. >>> What i have are world coordinates of center for every point. I am >>> curious is >>> it >>> possible to get screen coordinates from world coordinates and >>> current map >>> scale? >>> Also when we specify size of external graphic in SLD with >>> <sld:Size></sld:Size> is >>> it possible to get graphic height and width in pixels from it? >>> >>> mbedward wrote: >>>> >>>>> What i have are world coordinates of center for every point. I am >>>>> curious >>>>> is >>>>> it >>>>> possible to get screen coordinates from world coordinates and >>>>> current map >>>>> scale? >>>> >>>> mapFrame.getMapPane().getWorldToScreenTransform() is your friend >>>> >>>> Michael >>>> >>>> ------------------------------------------------------------------------------ >>>> Come build with us! The BlackBerry® Developer Conference in SF, >>>> CA >>>> is the only developer event you need to attend this year. Jumpstart >>>> your >>>> developing skills, take BlackBerry mobile applications to market >>>> and stay >>>> ahead of the curve. Join us from November 9-12, 2009. Register >>>> now! >>>> http://p.sf.net/sfu/devconf >>>> _______________________________________________ >>>> Geotools-gt2-users mailing list >>>> [hidden email] >>>> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users >>>> >>>> >>> >>> -- >>> View this message in context: >>> http://n2.nabble.com/ExternalGraphic-GetBoundingBox-tp3698425p3701620.html >>> Sent from the geotools-gt2-users mailing list archive at Nabble.com. >>> >>> ------------------------------------------------------------------------------ >>> Come build with us! The BlackBerry® Developer Conference in >>> SF, CA >>> is the only developer event you need to attend this year. Jumpstart >>> your >>> developing skills, take BlackBerry mobile applications to market and >>> stay >>> ahead of the curve. Join us from November 9-12, 2009. Register >>> now! >>> http://p.sf.net/sfu/devconf >>> _______________________________________________ >>> Geotools-gt2-users mailing list >>> [hidden email] >>> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users >> >> >> ------------------------------------------------------------------------------ >> Come build with us! The BlackBerry® Developer Conference in SF, >> CA >> is the only developer event you need to attend this year. Jumpstart >> your >> developing skills, take BlackBerry mobile applications to market >> and stay >> ahead of the curve. Join us from November 9-12, 2009. Register >> now! >> http://p.sf.net/sfu/devconf >> _______________________________________________ >> Geotools-gt2-users mailing list >> [hidden email] >> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users >> >> > > -- > View this message in context: http://n2.nabble.com/ExternalGraphic-GetBoundingBox-tp3698425p3708037.html > Sent from the geotools-gt2-users mailing list archive at Nabble.com. > > ------------------------------------------------------------------------------ > Come build with us! The BlackBerry® Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart > your > developing skills, take BlackBerry mobile applications to market and > stay > ahead of the curve. Join us from November 9-12, 2009. Register > now! > http://p.sf.net/sfu/devconf > _______________________________________________ > Geotools-gt2-users mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Geotools-gt2-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users |
||||||||||||||||
| Free Embeddable Forum Powered by Nabble | Help |
