[OpenLayers-Users] FW: OpenLayers Beginners Questions

[Erik Uzureau]

Made ticket:
http://trac.openlayers.org/ticket/817

On 6/17/07, Matt Hancher <mdh at email.arc.nasa.gov> wrote:
> On Jun 17, 2007, at 5:04 AM, Christopher Schmidt wrote:
>
> >> 2.
> >>
> >>      Problem with "var pointLayer = new OpenLayers.Layer.Vector("Point
> >> Layer");" and similar (Line and Polygon): All draw controls seem
> >> to draw
> >> points and vertices south-east of where the mouse-click occurred
> >> by about
> >> 1/2 of the diameter of the drawn Point-Circle. That means all
> >> drawn features
> >> are miss-placed. Is this a bug or is it just that I do use the
> >> draw feature
> >> wrongly? Source attached below. The website is at this stage not
> >> public for
> >> administrative reasons; sorry.
> >
> > Internet Explorer has problems with its 'box model': the 3px border
> > you're putting on your map is causing the browser to incorrectly
> > report
> > your mouse position relative to the map. If you remove that border,
> > this
> > will be fixed: you can instead create a slightly more complicated map
> > setup, with the map div inside another div which does have a border,
> > rather than putting it directly on a map.
> >
> > Erik, this is a bug we might be able to work around, can you file a
> > ticket for 2.6 to look at this? Gerd, if you or anyone want to
> > submit a
> > patch before that, then it should be able to make it into 2.5. The
> > function to look into is OpenLayers.Events.getMousePosition().
>
> For what it's worth, I've encountered a similar issue using Firefox
> under
> certain specific situations.  For example, again modifying the
> editingtoolbar.html example, try this:
>
>      <table style="position:absolute; margin:20px"><tr><td> <div
> id="map"></div> </td></tr></table>
>
> In this case getMousePosition() appears not to properly translate
> from client
> coordinates to map-local coordinates, with an offset equal to the
> 20px margin.
> The problem goes away if you use padding instead of margin, if you
> make the
> table non-absolute, if you use a div instead of a table, or if you
> use WebKit
> instead of Firefox.  So this was easy enough for me to work around on
> my own,
> but I thought if anybody starts looking at adding workarounds to
> getMousePosition()
> they might want to know about it.
>
> Matt
>
> Matthew D. Hancher
> Intelligent Systems Division
> NASA Ames Research Center
> Official: mdh at email.arc.nasa.gov
> Personal: mdh at maximumentropy.org
>
>
>
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