[mapguide-users] Fusion and Digitizing
Mike Adair
madair at dmsolutions.ca
Mon Feb 2 16:42:54 EST 2009
In Fusion 2.0, we can certainly clear the digitized features by calling
the Vector layer destroyFeatures() method. I'm not familiar with the
behaviour of the old viewers that MapGuideViewerAPI is trying to mimic
so I would need to know when the features should be cleared: when you
start drawing another feature? always after the handler is called?
Mike
Paul Spencer wrote:
> Thanks guys ... the digitizing code has changed in the upcoming 2.0
> release to use the OpenLayers vector library rather than our
> home-grown canvas implementation so we'll make sure there is a way to
> clean up after digitizing ...
>
> Mike, can you take a skim through this thread and make sure the new
> Vector implementation has a method for cleaning up, or implicitly
> cleans up if possible.
>
> Cheers
>
> Paul
>
>
> On 29-Jan-09, at 6:14 PM, Mark Pendergraft wrote:
>
>> thanks!
>> I'll take a look at it later tonight.
>> -Mark
>>
>> -----Original Message-----
>> From: mapguide-users-bounces at lists.osgeo.org
>> [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Rodolfo
>> Moreno
>> Sent: Thursday, January 29, 2009 3:02 PM
>> To: mapguide-users at lists.osgeo.org
>> Subject: RE: [mapguide-users] Fusion and Digitizing
>>
>>
>> Hi Mark, I have gotten to clear the digitized polygons in FUSION viewer
>> by
>> modifying the MapGuideViewerapi.js
>>
>> var polDigitizer;
>> function DigitizePolygon(handler) {
>> if (handler) {
>> var Fusion = window.top.Fusion;
>> var mapWidget = Fusion.getWidgetById(mapWidgetId);
>> var digitizer = new Fusion.Tool.Canvas.Polygon(mapWidget);
>> digitizer.mouseDown = MultiPointHandlers.prototype.mouseDown;
>> digitizer.mouseMove = MultiPointHandlers.prototype.mouseMove;
>> digitizer.dblClick = MultiPointHandlers.prototype.dblClick;
>> Object.inheritFrom(digitizer, Fusion.Tool.Canvas.prototype, []);
>> digitizer.handler = handler;
>> digitizer.activateCanvas();
>>
>> polDigitizer = digitizer;
>>
>> //add a listener to update the position of the features
>> var mapWidget = Fusion.getWidgetById(mapWidgetId);
>> mapWidget.registerForEvent(Fusion.Event.MAP_EXTENTS_CHANGED,
>> extendEvtResponse );
>> }
>> }
>>
>> function extendEvtResponse(){
>> var digitizer = polDigitizer;
>> digitizer.updatePx();
>> digitizer.clearContext();
>> digitizer.draw(digitizer.context);
>> }
>>
>> function clearPol(){
>> polDigitizer.clearContext();
>> var Fusion = window.top.Fusion;
>> var mapWidget = Fusion.getWidgetById(mapWidgetId);
>> mapWidget.deregisterForEvent(Fusion.Event.MAP_EXTENTS_CHANGED,
>> extendEvtResponse);
>> polDigitizer.deactivateCanvas();
>>
>> }
>>
>> In your main page you must call to clearPol() function in order to clear
>> the
>> digitized polygon. For the other shapes I guess that the logic is the
>> same.
>> The above code only clears the last polygon digitized. It's necessary to
>> manage an array of digitizers for controlling all digitized polygons. I
>> haven't had time for trying it.
>>
>> I have tested with mapguide 2.0.1 with FUSION 1.0.6 in IE7 and FF2
>> maybe you can improve it.
>>
>> Regards,
>>
>>
>> GordonL wrote:
>>>
>>> Hi Mark,
>>> I know what you mean about the sticky digitizing... I was told to look
>> at
>>> the
>>> resetCanvas function in the Measure.js file to get rid of that
>> leftover
>>> digitize graphics...but I haven't tried it yet...
>>>
>>> gordon
>>>
>>>
>>> Mark Pendergraft wrote:
>>>>
>>>> I was in no way implying the wheel should be reinvented, in fact the
>>>> code I posted was an example of how to use the MapGuideViewerAPI.js
>>>> supplied DigitizePolygon(handler) function that you referred to.
>>>>
>>>> I did say that I would like to see some method to clear the digitized
>>>> shapes after the function's handler has been called. In MGOS 1.2
>> after
>>>> a polygon was digitized, it was destroyed. In MGOS 2 with Fusion
>> 1.1,
>>>> the polygon stays on the map until the user closes their browser.
>>>>
>>>> -Mark P.
>>>>
>>>> -----Original Message-----
>>>> From: mapguide-users-bounces at lists.osgeo.org
>>>> [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of GordonL
>>>> Sent: Thursday, January 29, 2009 1:20 PM
>>>> To: mapguide-users at lists.osgeo.org
>>>> Subject: RE: [mapguide-users] Fusion and Digitizing
>>>>
>>>>
>>>> You know, you really do not need to reinvent the wheel, if you have
>>>> already
>>>> built a lot of code with the Basic Web Layouts. Did you know that
>>>> Fusion
>>>> supports some retro digitizing methods?
>>>> For example, I put the following in an INVOKESCRIPT in the Flexible
>> Web
>>>> Layout:
>>>>
>>>> top.parent.DigitizePoint(top.OnPointDigitized);
>>>>
>>>> I also have the OnPointDigitized in a JS file attached to the main
>>>> frame/window. So I reuse my code for both FUSION and Basic Web
>>>> Layouts...
>>>>
>>>> Just check out the functions in the MapGuideViewerApi.js in the
>>>> /www/fusion/MapGuide/ folder...
>>>> They include:
>>>> Refresh()
>>>> SetSelectionXML(selectionXml)
>>>> ZoomToView(x, y, scale, refresh)
>>>> DigitizePoint(handler)
>>>> DigitizeLine(handler)
>>>> DigitizeLineString(handler)
>>>> DigitizeRectangle(handler)
>>>> DigitizePolygon(handler)
>>>>
>>>> They work just like the classic MapGuide Viewer API...pretty sweet.
>>>>
>>>> gordon
>>>>
>>>>
>>>>
>>>>
>>>> Mark Pendergraft wrote:
>>>>>
>>>>> Absolutely.
>>>>> My biggest beef with digitizing in Fusion is that when you digitize
>> an
>>>>> object (point/polygon/etc.) it stays on the map. The existing
>>>> functions
>>>>> don't have a clear method to remove the digitized object, and my
>>>>> programming skills aren't good enough that I want to mess with it.
>>>>>
>>>>> It's very simple,
>>>>> Add a reference to MapGuideViewerApi.js and call DigitizePolygon()
>>>>>
>>>>> The DigitizePolygon function requires that you pass it a handler
>>>>>
>>>>> Something similar to the following:
>>>>>
>>>>> DigitizePolygon(CreateJobByPolygon);
>>>>>
>>>>> function CreateJobByPolygon(polygon) {
>>>>> var geomText = polygon.Count;
>>>>> for (var i = 0; i < polygon.Count; i++){
>>>>> geomText += "," + polygon.Point(i).X + "," +
>>>> polygon.Point(i).Y;
>>>>> }
>>>>> Fusion.getWidgetById('Map').setCursor('auto');
>>>>> // here you would send your geomText to a web service, or aspx
>>>>> page
>>>>> that would turn the coordinates into a linear ring
>>>>> // and then a polygon from there. The geomText variable (in this
>>>>> particular situation) evaluates to something similar to
>>>>> // 3,5000.00,5000.00,5050.00,5050.00,5100.00,5100.00
>>>>> }
>>>>>
>>>>>
>>>>> Of course you can format the way the coordinates are sent to your
>>>>> application any way you want.
>>>>>
>>>>> I would also recommend calling the DigitizePolygon() function from
>> an
>>>>> InvokeScript() widget, as I had some problems when I tried to
>> actually
>>>>> create a widget and call it from there. Also, I prefer to change my
>>>>> cursor when the widget is activated, you can see I put it back to
>>>> 'auto'
>>>>> in the CreateJobByPolygon() function, but I like to set it to
>>>>> 'crosshair' before the DigitizePolygon function is called.
>>>>>
>>>>> -Mark P.
>>>>>
>>>>> -----Original Message-----
>>>>> From: mapguide-users-bounces at lists.osgeo.org
>>>>> [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Stefan
>>>>> Dalakov
>>>>> Sent: Friday, January 23, 2009 12:35 PM
>>>>> To: MapGuide Users Mail List
>>>>> Subject: [mapguide-users] Fusion and Digitizing
>>>>>
>>>>> Hi all,
>>>>> From what I read here, should I conclude that digitizing functions
>> in
>>>>
>>>>> Fusion are not yet fully supported ?
>>>>> I need to digitize a polygon on the map and save it permanently. I
>>>> have
>>>>> this working with AJAX viewer, but would like to port it to Fusion
>>>>> Has anyone succeeded to do this ?
>>>>>
>>>>> Stefan Dalakov
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> mapguide-users mailing list
>>>>> mapguide-users at lists.osgeo.org
>>>>> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>>>>> _______________________________________________
>>>>> mapguide-users mailing list
>>>>> mapguide-users at lists.osgeo.org
>>>>> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>>>>>
>>>>>
>>>>
>>>> --
>>>> View this message in context:
>>>> http://n2.nabble.com/Fusion-and-Digitizing-tp2205560p2241352.html
>>>> Sent from the MapGuide Users mailing list archive at Nabble.com.
>>>>
>>>> _______________________________________________
>>>> mapguide-users mailing list
>>>> mapguide-users at lists.osgeo.org
>>>> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>>>> _______________________________________________
>>>> mapguide-users mailing list
>>>> mapguide-users at lists.osgeo.org
>>>> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>>>>
>>>>
>>>
>>>
>>
>>
>> -----
>> Rodolfo Moreno
>> CivilEng
>>
>> --
>> View this message in context:
>> http://n2.nabble.com/Fusion-and-Digitizing-tp2205560p2241865.html
>> Sent from the MapGuide Users mailing list archive at Nabble.com.
>>
>> _______________________________________________
>> mapguide-users mailing list
>> mapguide-users at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>> _______________________________________________
>> mapguide-users mailing list
>> mapguide-users at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>
>
--
Michael Adair
Senior Software Architect
DM Solutions Group Inc.
Office: (613) 565-5056 x26
madair at dmsolutions.ca
http://www.dmsolutions.ca
http://research.dmsolutions.ca
More information about the mapguide-users
mailing list