Hi All,
i'm tring to learn web2py, thanks for the wonderful book and for the really
nice tutorial!
i'm a bit 'stuck' on how to perform a simple task (i guess it is simple)
because of my ignorance.
.. i'm bring to update dynamic a graph-chart (generated with matplotlib) using
a form to pass the input the draw-function.
what i have is a controller :
# template_example.py that 'espone' a function 'variables' , it will display
an image generated by matplotlib using the 'stem_plot' function (in the same
.py file)
# import a lib that generate the data from the url gived as input
from ecoopclimate import Climate
#import some matplotlib methodsm numpy ...
from pylab import stem, setp, grid, savefig, show, gca, subplot, subplots_adjust
import matplotlib as mpl
import matplotlib.pyplot as plt
import datetime as dt
import numpy as np
# plot function
def stem_plot(data, name):
data[np.isnan(data)]=0
fig = plt.figure()
ax = fig.add_subplot(211)
mindate = int(data[0][0])
maxdate = int(data[0][-1])
date2_1 = dt.datetime(mindate, 1, 1)
date2_2 = dt.datetime(maxdate, 1, 1)
delta2 = dt.timedelta(days=365)
dates2 = mpl.dates.drange(date2_1, date2_2, delta2)
dateFmt = mpl.dates.DateFormatter('%Y')
ax.xaxis.set_major_formatter(dateFmt)
fig.autofmt_xdate(bottom=0.1)
x_p = dates2[np.where(data[1]>=0)[0]]
y_p = data[1][np.where(data[1]>=0)[0]]
x_n = dates2[np.where(data[1]<0)[0]]
y_n = data[1][np.where(data[1]<0)[0]]
markerline, stemlines, baseline = stem(x_p, y_p, 'r-')
setp(markerline, 'markerfacecolor', 'b')
setp(baseline, 'color', 'r', 'linewidth', 2)
setp(stemlines, 'linewidth', 1)
markerline, stemlines, baseline = stem(x_n, y_n, 'b-')
setp(markerline, 'markerfacecolor', 'b')
setp(baseline, 'color', 'r', 'linewidth', 2)
setp(stemlines, 'linewidth', 1)
grid()
setp(gca(), 'xlabel', 'Year', 'ylabel', name)
fig = '/Users/epifanio/web2py/applications/welcome/static/'+name+'.png'
dateFmt = mpl.dates.DateFormatter('%Y')
savefig(fig)
return fig
#show()
# function connected to the view : variables.html
def variables():
nao_url =
'https://climatedataguide.ucar.edu/sites/default/files/cas_data_files/asphilli/nao_station_djfm.txt'
clm = Climate()
NAO = clm.nao(nao_url, 'nao.txt')
image = stem_plot(NAO['nao'], 'nao')
return dict(d=URL('static', 'nao.png'))
the view template_example/variables.html is :
{{extend 'layout.html'}}
<h1>Image generated with matplotlib</h1>
<img src="{{=d}}" alt="Red dot" />
As you can see from the code in stem_plot it takes as input : 'data' and 'name'
i'm hardcoding the var inside the function 'variables'
i need to modify that code adding a 'form' in the view that will take 2 string
as input
nao_url =
'https://climatedataguide.ucar.edu/sites/default/files/cas_data_files/asphilli/nao_station_djfm.txt'
image_name = 'imagename'
and pass this input to the main function that generate the graph.
Have you any hints on how to do that ?
i'd like to have the form in the same page where the image is displayed
so that i can update the image every time i'll resubmit the form.
i'm a beginner, an example that does something like that will be really helpful
:)
Many many Thanks for your help!
Massimo.
