On Jul 27, 2010, at 12:14 PM, ext Stephen Woodbridge wrote: > I believe the origin of an image is the upper-left corner, so you need > to specify your offsets based on that point.
I don't think so. I believe externalGraphics center, by default, on the center of the image. (I don't know what happens for images where this is a half pixel; I assume we round somehow, but I don't know how.) -- Chris > -Steve > > William Martin wrote: >> All, >> >> Hi, new user. I'm using a vector layer for placing markers on the map, and >> I'm using the externalGraphic property to specify a marker of my own. How >> is that image anchored with respect to the lat/lon coordinates that it >> represents? >> >> That is, if exactly one pixel in the external graphic corresponds to the >> point on the map, is it: >> >> a) The top left corner pixel >> b) The top right corner pixel >> c) The bottom left corner pixel >> d) The bottom right corner pixel >> e) The exact center pixel >> f) A pixel halfway along one edge >> Or g) something else entirely? >> >> I need to know so that I can figure out the correct offsets to use with my >> graphic. >> >> I tried to figure this out by using an external graphic for the marker which >> was a 1x1 pixel animated GIF blinking red/white/red/white and then defining >> another marker for the same coordinates with a translucent version of the >> regular image. But the 1x1 graphic refused to show up, even when I disabled >> the other marker so that it was on its own. Weird. >> >> Thanks! >> >> Will Martin >> Web Services Librarian >> Chester Fritz Library, University of North Dakota >> >> _______________________________________________ >> Users mailing list >> [email protected] >> http://openlayers.org/mailman/listinfo/users > > _______________________________________________ > Users mailing list > [email protected] > http://openlayers.org/mailman/listinfo/users _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users
