On 9/27/10 8:01 AM, Hendrik Fuß wrote:
Hi folks,
thanks everyone for the comments. So far I have experimented with a
Zoomify layer and a few editing controls and got really promising
results. I'm all excited. OpenLayers rocks!
OL/Zoomify seems to handle pixel coordinates well. I'm still
struggling to teach it micrometers instead of pixels... will need to
have a closer look at the docs I suppose. I will definitely look into
tile servers such as iipimage and djatoka, as well as into gdal2tiles.
I think most of the work on my side will be about serving and storing
vector content on the server side. GML is probably okay for me, even
if I feel a bit strange about using a "geographic markup language" for
my non-geographical application. I will also need to write some custom
event handlers for drawing on the client side: I need a freehand style
drawing tool, as well as ellipse and circle tools.
If we mean the same thing by "freehand," see this example:
http://openlayers.org/dev/examples/draw-feature.html
As mentioned in that page, holding down the shift key will trigger
freehand drawing (one vertex per mousemove). If you want freehand by
default, set up the control with handlerOptions. E.g.
var scribble = new OpenLayers.Control.DrawFeature(
layer,
OpenLayers.Handler.Path,
{handlerOptions: {freehand: true}}
);
// awkward, yes
And, depending on your needs, you may be able to get ellipse drawing
with by using the RegularPolygon handler for the DrawFeature control
with the irregular option true.
var ellipse = new OpenLayers.Control.DrawFeature(
layer,
OpenLayers.Handler.RegularPolygon,
{handlerOptions: {irregular: true, sides: 40}}
);
http://openlayers.org/dev/examples/regular-polygons.html
Is there any piece of developer documentation that you would recommend
apart from the APIs, such as books?
My opinion is that our examples are currently the best source of
"documentation." Though it takes a fair bit of knowledge to get
started, with the examples and the library source, you can usually piece
together what you need.
People have talked about books, but I don't think the terms have been
right (yet).
Tim
Again, thanks for your input. If I proceed with the project, I'm
hoping to finally contribute code back to OpenLayers as far as
possible.
PS - If you are interested in contributing documentation, that's
probably where we could use the most help :).
bye
Hendrik
2010/9/27 Adrià Mercader<amercader....@gmail.com>:
Hi Hendrick,
Sean's answer covers all the main aspects you may face using OL with
non-geo images. I would only add that gdal2tiles [1] makes extremely
easy to build tiled pyramids for large images and their corresponding
OpenLayers based viewers, like this one:
http://amercader.net/books.html
You may give it a look a see if it can help you.
Cheers,
Adrià
[1] http://www.klokan.cz/projects/gdal2tiles/
Sean a
On 24 September 2010 10:31, Hendrik Fuß<hendrik.f...@gmail.com> wrote:
Hi folks,
I'm sorry if you receive this as a duplicate post -- I've had some
problems subscribing to the list, so I'm not sure whether my initial
post got through or not.
I'd be interested in your opinions on the following: I am planning to
develop a web application that is not exactly about geographical data,
but on a technical level has a lot in common with OpenLayers, so I'm
wondering whether I could 'abuse' OpenLayers for the task.
The application is essentially about sharing and markup of large,
microscopic images. It allow users to upload such images for others to
view. Viewers should be able to zoom and pan through the image, mark
objects and create vector drawings on top of the image, then save
everything for others to view or download the vector data to
specialized microscopic software.
With all the UI control, support for tiled images and markup,
OpenLayers looks very tempting to me, but I haven't had any exposure
to the development side. So I was wondering what you think, does this
sound feasible? What problems would you anticipate?
many thanks
Hendrik
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Adrià Mercader
-----------------------------
http://amercader.net
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Tim Schaub
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Expert service straight from the developers.
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