lol; these are all very common questions :-) let me try and answer...
On Monday, 9 May 2011 at 1:15 PM, mounir younes wrote:
I am willing to use the ExternalGraphicsFactory to draw building icons on my
map (format png) can someone help in this task and provide me with the
appropriate code? I checked the user list and there is no example on how to use
it !
That is because you do not need ExternalGraphicsFactory to do this work; PNG is
supported out of the box:
See the example here (search for png on that page):
- http://docs.geotools.org/latest/userguide/library/render/style.htmlr
> And I have a second question. What is the best way to simulate a car moving
> on a map? I need to change its position.
I tell you what is not a great way; making a feature collection with your
single point and then updating each second as and asking the map to redraw.
We get a person here every other week trying this out; and complaining that
gt-renderer is slow.
There is a flyingsaucers demo you can review; but the real answer is to set up
a second raster to draw your moving car into; and draw that over top of the map
rendered by gt-renderer.
Remember that JMapPane is just a demo showing how you can use StreamingRenderer
to draw into a BufferedImage. You can do the same thing in your own code; and
have one buffered image for the map and a second one for your "overlays"
including the moving car.
> One more question. Does anyone know a good 2D renderer ? because the
> gt-renderer flickers a lot, how could this be solved?
It is more how you use it :-) The GeoTools renderer is doing a lot of
calculation and data access; not what you want in the middle of animation.
Remember gt-renderer is not loading your data into memory; just drawing from
disk each time. You can experiment with loading your data into memory
(specifically into a spatial index) if you want faster performance out of it.
Reference:
-
http://docs.geotools.org/latest/userguide/library/main/collection.html#performance-options
Jody
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