[mapguide-users] Fusion and Digitizing
Rodolfo Moreno
rmoreno at voxiva.com
Thu Jan 29 18:01:51 EST 2009
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
>>>
>>>
>>> _______________________________________________
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>>> mapguide-users at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/mapguide-users
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>>>
>>>
>>
>> --
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>> Sent from the MapGuide Users mailing list archive at Nabble.com.
>>
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>
>
-----
Rodolfo Moreno
CivilEng
--
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