Incorrect scaledenominator in map's viewportmodel after map creation
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Key: UDIG-1226
URL: http://jira.codehaus.org/browse/UDIG-1226
Project: uDIG
Issue Type: Bug
Components: API map
Affects Versions: UDIG 1.1.RC8
Reporter: Tony Roth
Priority: Minor
I just copied my mails from the mailinglist:
After creation of a map the ScaleDenominator given by the ViewPortModel of the
map is incorrect.
my Code:
Envelope bbox = new Envelope(-180,180,-90,90); // initial map covers the world
map = ProjectFactory.eINSTANCE.createMap(....)
// create Layers and add them to the map ....
// set bounding box
map.getViewportModelInternal().setBounds(bbox);
// some more stuff ....
// finally
page.openEditor(new MapEditorInput(map), MapEditor.ID);
The editor opens and the renderer renders the map. Below the map the
ScaleDenominator is shown correctly in the ScaleRatioLabel. So it seems
everything correct but when I fetch the ScaleDenominator with
map.getViewportModel().getScaleDenominator() then I get an incorrect
ScaleDenominator.
This only happens directly after map creation. After any action (zoom, pan,
layer changed) the ScaleDenominator is correct.
And that's what I think:
The editorpart doesn't have the same aspect ratio like the map with the
bounding box mentioned above. The map (with the used projection in my case) has
an aspect ratio of 2:1, the editorpart something like 2:1,5. Therefore there
are white bars above and below the map like watching a 16:9 movie on a 4:3
screen. As mentioned above the ScaleDenominator in the ScaleRatioLabel is
correct (in my case 1:87'699'473) but the ScaleDenominator given by
map.getViewportModel().getScaleDenominator() is 1:67'781'811. If I set the
ScaleDenominator of the map to this value, then there will be the special case
that the top of the map (90°) is the upper edge of the editorpart and the
bottom of the map (-90°) is the lower edge. Like scaling the 16:9 movie that
you don't have any bars on your 4:3 screen but cutting of the left and right
part of the movie. I don't think that's a coincidence. Could it be that when
opening the editorpart and first time rendering of the map the renderer tries
to fill the editorpart in width and height and that the scaledenominator of the
map is set at this point.
I examined the ScaleRatioLabel and there I saw that one can add a listener to
the ViewportModel. I did it and now it works. The ViewportModel fires an event
and then I can get the scaleDenominator directly from the ViewportModel and
it's the same like in the ScaleRatioLabel. (would be odd if not, it's the same
way to get it)
I think this means that not all changes of the ViewportModel are noticed by the
map even the map itself fires events of the type VIEWPORT_MODEL.
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