[mapguide-users] Zoom to selection

[Campbell, Keith A]

Kenneth,
 
I'm trying to do something similar, and I'm puzzled by your suggestion
that the new scale will be the width or height of the box. surely there
must be a conversion between the current width and scale to get the new
scale? I'm assuming that the zoom-to will be accomplished with the
Viewer API ZoomToView method which requires a scale.
 
What makes this difficult is that he Web API does not seem to have a
method for getting the current view width (map units), as opposed to
display width (pixels).
 
Keith

________________________________

From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Kenneth,
GEOGRAF A/S
Sent: 21 September 2007 09:09
To: MapGuide Users Mail List
Subject: Re: [mapguide-users] Zoom to selection


The only way I know of, is to issue a select of the objects on the
datasource.
While reading the objects, you can get their envelope (aka mbr, bbox,
etc..).
If you sum up alle the objects enevlopes, you can get the minimum
rectangle in which all objects fit.
Once you have this box, your center, will be the center of the box, and
the scale will be the width or height of the box.

Regards, Kenneth, GEOGRAF A/S


Ivan Milicevic skrev: 

	Hello,
	 
	I wonder is it possible to calculate zoom extent on selected
objects? For example, I have selected various type of objects (line,
polygon, point) but I don't have any XY info in database on these
objects. How can I calclate center point and scale in this case?
	 
	Any help-advices are wellcome.
	 
	Greetings,
	 
	Ivan.
	  
	
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