[web2py:26327] ho to exchange data between controllers

[Tim Michelsen]

Hello web2py folks,
what is the preferred way to exchange parameters or variables between 
views and controllers?

I have a page where a form gathers input and then a plot is generated 
according to these inputs.

I am currently using the following setup:

## in VIEW
<h2>Input form</h2>
  {{=form}}
<h2>Submitted variables</h2>
{{=(request.vars.number, request.vars.hold)}}

<center>
   <img  src="{{=URL(r=request,f='image_mat_form', 
args=[request.vars.number, request.vars.hold])}}"/>
   <!--
   <img src="{{=URL(r=request,f='image_pil')}}"/>
   -->
</center>

# in CONTROLLER
def plot():


     form=FORM(TABLE(TR("Your number:",INPUT(_type="text", 
_name="number",requires=IS_FLOAT_IN_RANGE(0, 10))),
                     TR("Overlay new 
curves:",INPUT(_type="checkbox",_name="hold", value=False)),
                     TR("",INPUT(_type="submit",_value="SUBMIT"))))
     if form.accepts(request.vars,session):
         response.flash="form accepted"
     elif form.errors:
         response.flash="form is invalid"
     else:
         response.flash="please fill the form"
     return dict(form=form,vars=form.vars)


def image_mat_form():
     number = float(request.args[0])
     hold = request.args[1]
     if hold == 'on':
         hold_check = True
     else:
         hold_check = False


     import sys
     import matplotlib as mpl
     mpl.use('Agg')

     #    from pylab import plot, savefig, legend, hold
     import matplotlib.pyplot as plt
     import numpy as np
     import scipy as sp
     import scipy.stats as st

     plt.hold(hold_check)
     t = np.arange(0.0 , 5.0, 0.05)
     s1 = np.sin(number * np.pi * t )
     s2 = s1 * np.exp(-t)

     plt.plot(t, s1, 'g--o', t, s2, 'r:s' )
     plt.legend(('sine wave ', 'damped exponential'))


     # plot([1, 2 , number])
     response.headers['Content-Type']="image/png"
     plt.savefig(response.body)

     return response.body.getvalue()

is there a better option for exchanging the form data than
args=[request.vars.number, request.vars.hold] -> number = 
float(request.args[0]), hold = request.args[1]?
I will extend this and the "request.vars" will be many more.

Please tell if you do not understand my question.

Also I'd like to know how to add a file upload field to a FORM.

Thanks in advance,
Timmie

Reference:
Subject: [web2py:26240] Re: how can i write a PIL image object to response
http://permalink.gmane.org/gmane.comp.python.web2py/13567


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