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Thats about how I tried to explain it.<br>
I would derive the object centroid and size by using a combined bbox
for all objects.<br>
<br>
Perhaps I was a bit fuzzy explaining that.<br>
<br>
<pre class="moz-signature" cols="72">Regards, Kenneth, GEOGRAF A/S
</pre>
<br>
<br>
Campbell, Keith A skrev:
<blockquote
cite="mid:2D5D8AC034A54041A6B2AE1C9148CC3106F1680E@SGBBMA2102.wsatkins.com"
type="cite">
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<div dir="ltr" align="left"><span class="411315912-21092007"><font
color="#0000ff" face="Arial" size="2">Thanks Kenneth.</font></span></div>
<div dir="ltr" align="left"><span class="411315912-21092007"></span> </div>
<div dir="ltr" align="left"><span class="411315912-21092007"><font
color="#0000ff" face="Arial" size="2">Not sure that I understand that
completely, but this is how I have dealt with it:-</font></span></div>
<div dir="ltr" align="left"><span class="411315912-21092007"></span> </div>
<div dir="ltr" align="left"><span class="411315912-21092007"><font
color="#0000ff" face="Arial" size="2">(I needed to generate a list of
URLs that will zoom into the relevant position on the map at a scale
based on the size of the object)</font></span></div>
<div dir="ltr" align="left"><span class="411315912-21092007"></span> </div>
<div dir="ltr" align="left"><span class="411315912-21092007"><font
color="#0000ff" face="Arial" size="2">* The centroid of the object is
calculated</font></span></div>
<div dir="ltr" align="left"><span class="411315912-21092007"><font
color="#0000ff" face="Arial" size="2">* The size of the object is
queried at the feature source</font></span></div>
<div dir="ltr" align="left"><span class="411315912-21092007"><font
color="#0000ff" face="Arial" size="2">* the hyperlinks are created
server-side with a call to a JavaScript function and the required size
of the window is passed as a parameter, plus the centroid x and y.</font></span></div>
<div dir="ltr" align="left"><span class="411315912-21092007"><font
color="#0000ff" face="Arial" size="2">* The JavaScript function gets
the current map size and scale, and calculates the required scale</font></span></div>
<div dir="ltr" align="left"><span class="411315912-21092007"><font
color="#0000ff" face="Arial" size="2">* It then calls the ZoomToView
function</font></span></div>
<div dir="ltr" align="left"><span class="411315912-21092007"></span> </div>
<div dir="ltr" align="left"><span class="411315912-21092007"><font
color="#0000ff" face="Arial" size="2">Keith</font></span></div>
<div dir="ltr" align="left"><span class="411315912-21092007"></span> </div>
<div class="OutlookMessageHeader" dir="ltr" align="left" lang="en-us">
<hr tabindex="-1"><font face="Tahoma" size="2"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:mapguide-users-bounces@lists.osgeo.org">mapguide-users-bounces@lists.osgeo.org</a>
[<a class="moz-txt-link-freetext" href="mailto:mapguide-users-bounces@lists.osgeo.org">mailto:mapguide-users-bounces@lists.osgeo.org</a>] <b>On Behalf Of </b>Kenneth,
GEOGRAF A/S<br>
<b>Sent:</b> 21 September 2007 10:46<br>
<b>To:</b> MapGuide Users Mail List<br>
<b>Subject:</b> Re: [mapguide-users] Zoom to selection<br>
</font><br>
</div>
I have remarked that it is a problem that the map position (x, y,
scale) is not avalible on the server.<br>
You must manually pass this information from the viewer to your scripts.<br>
<br>
The width of the map should be the maximum width that can display the
bbox. To calculate this width, you must know the browser window width
and height.<br>
Using this, you can calculate the height/width ratios and thus get the
required width. This width will be in coordinate system units.<br>
<br>
How you go from width to scale is dependant on your coordinate system.<br>
You might send along the current scale, and use that with the window
info to calculate a new ratio.<br>
<pre class="moz-signature" defanghtml_cols="72">Regards, Kenneth, GEOGRAF A/S
</pre>
<br>
<br>
Campbell, Keith A skrev:
<blockquote
cite="mid:2D5D8AC034A54041A6B2AE1C9148CC3106F16397@SGBBMA2102.wsatkins.com"
type="cite">
<meta content="MSHTML 6.00.2900.3059" name="GENERATOR">
<div dir="ltr" align="left"><span class="197225908-21092007"><font
color="#0000ff" face="Arial" size="2">Kenneth,</font></span></div>
<div dir="ltr" align="left"><span class="197225908-21092007"></span> </div>
<div dir="ltr" align="left"><span class="197225908-21092007"><font
color="#0000ff" face="Arial" size="2">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.</font></span></div>
<div dir="ltr" align="left"><span class="197225908-21092007"></span> </div>
<div dir="ltr" align="left"><span class="197225908-21092007"><font
color="#0000ff" face="Arial" size="2">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).</font></span></div>
<div dir="ltr" align="left"><span class="197225908-21092007"></span> </div>
<div dir="ltr" align="left"><span class="197225908-21092007"><font
color="#0000ff" face="Arial" size="2">Keith</font></span></div>
<br>
<div class="OutlookMessageHeader" dir="ltr" align="left"
lang="en-us">
<hr tabindex="-1"> <font face="Tahoma" size="2"><b>From:</b> <a
moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="mailto:mapguide-users-bounces@lists.osgeo.org">mapguide-users-bounces@lists.osgeo.org</a>
[<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="mailto:mapguide-users-bounces@lists.osgeo.org">mailto:mapguide-users-bounces@lists.osgeo.org</a>]
<b>On Behalf Of </b>Kenneth, GEOGRAF A/S<br>
<b>Sent:</b> 21 September 2007 09:09<br>
<b>To:</b> MapGuide Users Mail List<br>
<b>Subject:</b> Re: [mapguide-users] Zoom to selection<br>
</font><br>
</div>
The only way I know of, is to issue a select of the objects on the
datasource.<br>
While reading the objects, you can get their envelope (aka mbr, bbox,
etc..).<br>
If you sum up alle the objects enevlopes, you can get the minimum
rectangle in which all objects fit.<br>
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.<br>
<pre class="moz-signature" defanghtml_cols="72">Regards, Kenneth, GEOGRAF A/S
</pre>
<br>
<br>
Ivan Milicevic skrev:
<blockquote
cite="mid:9CAB6B340CCF9E44BE4ACFCF56E67B0705A451@supranet" type="cite">
<pre wrap="">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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