[Zope] Using a generated image map

[Yves Bastide]

Oliver Bleutgen wrote:
> Yves Bastide wrote:
> 
>> Dieter Maurer wrote:
>>
>>> Yves Bastide wrote at 2003-5-27 15:21 +0200:
>>>  > ...
>>>  > OK, I'll try to be clearer.  _The same_ script does the image and 
>>> the  > map.  If images were inlined in HTML, I'd write something like
>>>  >  > <div tal:define="img_and_map here/generateImageAndMap">
>>>  >    <img tal:content="img_and_map/img" usemap="#mymap"/>
>>>  >    <map name="mymap" tal:replace="structure img_and_map/map"></map>
>>>  > </div>
>>>
>>> You know that HTML cannot include an image directly into a page..
>>> It must always go via an URL.
>>>
>>>   Thus, you script must make the generated image avaiblable via an
>>>   URL and return the URL to the image.
>>
>>
>>
>> Yes. And that's the problem :-)
>>
>> I may store the image in a transient container buried in a temporary 
>> folder ...  Did it once in the session, but this is gross.
> 
> 
> I'm interested. Why is this a problem (storing an image in the session)? 
> I think the java guys store things in sessions all the time (not that 
> this is an argument here ;))
> 

A session is per-user, while my images aren't, so there's a small 
overhead for too many generations.  Furthermore, I expect they'll be 
harder to invalidate when the things to draw change

> 
> oliver
> 
> 

Yves