In index(), the value of 'image' ends up being the URL
'/cavityflow/default/cavityflow_plot', which is not the URL of the image you
want to load. Instead, that URL itself ultimately just returns another URL,
'/cavityflow/static/images/cavityflow.gif'. So, your img src attribute is
pointing to a string representation of the URL of the image, not the image
itself.
Instead, just have the index function create the image in /static/images,
and use the image URL as the src attribute, like this:
def index():
[snip]
if form.accepts(request.vars, session, keepvalues=True):
[snip]
cavityflow_plot() # this creates the image and saves it in the
static folder
image=URL('static','images/cavityflow.gif')
return dict(form=form, image=image)
Note, as is, the cavityflow_plot() function is accessible as a URL. Since
you are only using it internally and probably do not need/want to it be
accessible via URL, you should either give it at least one argument or
precede its name with a double underscore (controller functions that take
arguments or start with a double underscore are not publicly exposed -- see
http://web2py.com/book/default/chapter/04#Dispatching).
Anthony
On Tuesday, August 23, 2011 6:02:51 AM UTC-4, Henri Heinonen wrote:
> Ok.
>
> This is the default/index.html:
> {{extend 'layout.html'}}
> <h1>cavityflow</h1>
> {{=form}}
> {{if image:}}
> <hr />
> <h2>Constants</h2>
> <p>These are the constants that were used during the simulations.</p>
> {{=BEAUTIFY(request.vars)}}
> <h2>Figure</h2>
> <img src="{{=image}}" alt="loading..."/>
> {{pass}}
>
> This is the default.py:
> http://pastebin.com/VGE69RG1
>
> Does this work for you?
>
> On Aug 22, 1:10 pm, Henri Heinonen <[email protected]> wrote:
> > default/index.html:
> > {{extend 'layout.html'}}
> > <h1>cavityflow</h1>
> > {{=form}}
> > {{if image:}}
> > <hr />
> > <h2>Figure</h2>
> > <img src="{{=image}}" alt="loading..."/>
> > {{pass}}
> >
> > default.py:
> > def index():
> > form=FORM('nx:', INPUT(_name='nx', _value=20.0), BR(), 'ny:',
> > INPUT(_name='ny', _value=20.0), BR(), 'nt:', INPUT(_name='nt',
> > _value=100.0), BR(), 'nit:', INPUT(_name='nit', _value=100.0), BR(),
> > 'dt:', INPUT(_name='dt', _value=0.01), BR(), 'vis:',
> > INPUT(_name='vis', _value=0.1), BR(), 'rho:', INPUT(_name='rho',
> > _value=1.0), BR(), INPUT(_type='submit',_value='Make figure'))
> >
> > image=None
> > if form.accepts(request.vars, session, keepvalues=True):
> > session.flash = 'Form accepted.'
> > session.nx=float(request.vars.nx)
> > session.ny=float(request.vars.ny)
> > session.nt=float(request.vars.nt)
> > session.nit=float(request.vars.nit)
> > session.dt=float(request.vars.dt)
> > session.vis=float(request.vars.vis)
> > session.rho=float(request.vars.rho)
> > image=URL(r=request,f='cavityflow_plot')
> > return dict(form=form, image=image)
> >
> > def cavityflow_plot():
> > return cavityflow(session.nx, session.ny, session.nt, session.nit,
> > session.dt, session.vis, session.rho)
> >
> > def cavityflow(nx, ny, nt, nit, dt, vis, rho):
> > ...*clip* *clip* ... # Here the application will make one hundred png
> > images.
> > os.system("convert *.png cavityflow.gif")
> > # What do I need to add in here in order to return the cavityflow.gif
> > onto the webpage of my application?
> >
> > The question is in the source code as a comment line.
> >
> > Yours sincerely, Henri Heinonen.
