Using fromLatLngToDivPixel in v3
Thai Dang Vu
I looked at the v3 API reference and noticed that if I want to use methods like fromLatLngToDivPixel ... I need a MapCanvasProjection object. And to have a MapCanvasProjection object, I need an OverlayView object.
In my situation, I don't have any overlay on the map. For example, I show the road map at some (lat, lng) and at some zoom level. Now I need to know the pixel position when the user clicks on the map. To do that in v2, I listen to the map click event where I have the (lat, lng) and use map.fromLatLngToDivPixel. In v3, the object map doesn't have that method. How I can do the same thing in v3?
Thank you.
Marcelo
> I looked at the v3 API reference and noticed that if I want to use methods
> like fromLatLngToDivPixel ... I need a MapCanvasProjection object. And to
> have a MapCanvasProjection object, I need an OverlayView object.
Look at this example:
http://code.google.com/apis/maps/documentation/v3/examples/map-coordinates.html
It contains a MercatorProjection object.
... and the explanation of how things work in V3:
http://code.google.com/apis/maps/documentation/v3/overlays.html#CustomMapTypes
Pay special attention to "World Coordinates".
--
Marcelo - http://maps.forum.nu
--
helen
I think I am looking for the same information but the links above did
not completely answer it for me. I need to get the pixel co-ordinates
of a point within my map div and I am having trouble figuring it out
from the world co-ordinates. If I mulitply them by 2 to the power of
zoom as described in the link above, I get the number of pixels from
0,0 on the whole map, not the current view (i.e. div container). Is
there a straightforward method to get this information? I can't seem
to figure it out.
Thanks.
On Mar 1, 1:39 pm, Marcelo <marcelo...@hotmail.com> wrote:
> On Mar 1, 5:31 pm, Thai Dang Vu <tdan...@gmail.com> wrote:
>
> > I looked at the v3 API reference and noticed that if I want to use methods
> > like fromLatLngToDivPixel ... I need a MapCanvasProjection object. And to
> > have a MapCanvasProjection object, I need an OverlayView object.
>
> Look at this example:http://code.google.com/apis/maps/documentation/v3/examples/map-coordi...
> It contains a MercatorProjection object.
>
> ... and the explanation of how things work in V3:http://code.google.com/apis/maps/documentation/v3/overlays.html#Custo...
> Pay special attention to "World Coordinates".
>
> --
> Marcelo -http://maps.forum.nu
William
fromLatLngToDivPixel method:
http://code.google.com/intl/nl/apis/maps/documentation/v3/reference.html#MapCanvasProjection
a way to get coordinates is to create an empty OverlayView and set the
map. This will link the map div to the overlay.
click on the map to see coordinates:
http://www.william-map.com/20100416/1/map.htm
...
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helen
I could not glean that from the documentation. Maybe my head is a
little stuck in v2, or it needs more explanation somewhere (or both!)
On Apr 16, 1:44 am, William <william.g...@gmail.com> wrote:
> the OverlayView has a MapCanvasProjection, which has the
> fromLatLngToDivPixel method:
>