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: [email protected]
[mailto:[email protected]] On Behalf Of Rodolfo
Moreno
Sent: Thursday, January 29, 2009 3:02 PM
To: [email protected]
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: [email protected]
[mailto:[email protected]] On Behalf Of GordonL
Sent: Thursday, January 29, 2009 1:20 PM
To: [email protected]
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: [email protected]
[mailto:[email protected]] 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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View this message in context:
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-----
Rodolfo Moreno
CivilEng
--
View this message in context:
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Sent from the MapGuide Users mailing list archive at Nabble.com.
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Michael Adair
Senior Software Architect
DM Solutions Group Inc.
Office: (613) 565-5056 x26
[email protected]
http://www.dmsolutions.ca
http://research.dmsolutions.ca
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