here I am again...
I fell like a moron, but I just cannot have it work...
so, the last line of the controller is:
return dict(imagebinarydata=stream.getvalue())
and this is the corresponding view:
{{extend 'layout.html'}}
<h1>This is the matplotlib/simple.html template</h1>
<img src="{{=embed64(data = {{=imagebinarydata}} ) }}" />
unfortunately the syntax is wrong:
response.write(embed64(data = {{=imagebinarydata)
^
SyntaxError: invalid syntax
and I don't quite understand why.
Is it also necessary to include extension='image/png' in the call to
embed64?
Thanks!
Cheers,
aus
On Dec 17, 1:02 am, aus <[email protected]> wrote:
> Thank you, Massimo!
> Sorry for the multiple posts... I didn't mean it :)
>
> cheers,
> ale
>
> On Dec 16, 7:26 pm, mdipierro <[email protected]> wrote:
>
> > You have to do it the old fashion way
>
> > <img src="url_to_the_png_action" />
>
> > web2py allows you to do
>
> > <img src="{{=embed64(data='imagebinarydata')}}" /> but this is not
> > supported by IE.
>
> > Massimo
>
> > On Dec 16, 11:59 am, aus <[email protected]> wrote:
>
> > > now the question is how to place the figure in a variable to be used
> > > in a template. What's the best way of doing that? Should I pack the
> > > stream into a dict? How should the view look like?
>
> > > thanks!
> > > aus
>
> > > On Dec 16, 5:27 pm, aus <[email protected]> wrote:
>
> > > > ok, I found it, I mistyped 'Content-Type', my fault
>
> > > > thanks!
> > > > aus
>
> > > > On Dec 16, 5:04 pm, aus <[email protected]> wrote:
>
> > > > > ok, it works, but firefox displays the raw data, not a figure. I guess
> > > > > I need an appropriate view for that, am I right?
>
> > > > > Cheers
> > > > > aus
>
> > > > > On Dec 16, 4:56 pm, mdipierro <[email protected]> wrote:
>
> > > > > > response.header['content-type']='image/png'
>
> > > > > > should have been
>
> > > > > > response.headers['Content-Type']='image/png'
>
> > > > > > Massimo
>
> > > > > > On Dec 16, 9:48 am, aus <[email protected]> wrote:
>
> > > > > > > Hi Massimo,
>
> > > > > > > thank you for the *really* prompt reply!
> > > > > > > I managed to have Dojox charts work, but I'm getting a error
> > > > > > > message
> > > > > > > form the "matplotlib" code (btw, "import datetime" was missing). I
> > > > > > > pasted the Dojo code at the bottom of this email, just in case
> > > > > > > I'm not
> > > > > > > the only beginner around :)
>
> > > > > > > Traceback (most recent call last):
> > > > > > > File "/home/aus/Software/Web2py/web2py/gluon/restricted.py",
> > > > > > > line
> > > > > > > 62, in restricted
> > > > > > > exec ccode in environment
> > > > > > > File
> > > > > > > "/home/aus/Software/Web2py/web2py/applications/test/controllers/
> > > > > > > matplotlib.py", line 29, in <module>
> > > > > > > File "/home/aus/Software/Web2py/web2py/gluon/globals.py", line
> > > > > > > 55,
> > > > > > > in <lambda>
> > > > > > > self._caller=lambda f: f()
> > > > > > > File
> > > > > > > "/home/aus/Software/Web2py/web2py/applications/test/controllers/
> > > > > > > matplotlib.py", line 23, in simple
> > > > > > > response.header['content-type']='image/png'
> > > > > > > TypeError: 'NoneType' object does not support item assignment
>
> > > > > > > what's wrong with the response?
>
> > > > > > > thank you once again!
>
> > > > > > > Cheers,
> > > > > > > aus
>
> > > > > > > Dojo / Dojox charting / JSON example:
>
> > > > > > > <script type="text/javascript">
>
> > > > > > > dojo.require("dojox.charting.Chart2D");
> > > > > > > {{import gluon.contrib.simplejson as sj}}
>
> > > > > > > function plott(){
> > > > > > > //var dd = dojox.json.ref.fromJson(data);
> > > > > > > //var data = [1,3,2,4,3,6];
> > > > > > > console.debug({{=sj.dumps(data)}});
> > > > > > > var chart1 = new dojox.charting.Chart2D("simplechart");
> > > > > > > chart1.addPlot("default", {type: "Lines"});
> > > > > > > chart1.addAxis("x");
> > > > > > > chart1.addAxis("y", {vertical: true});
> > > > > > > chart1.addSeries("Series 1", {{=sj.dumps(data)}});
> > > > > > > chart1.render();};
>
> > > > > > > dojo.addOnLoad(plott);
>
> > > > > > > </script>
>
> > > > > > > On Dec 16, 3:49 pm, mdipierro <[email protected]> wrote:
>
> > > > > > > > In web2py+matplotlib:
>
> > > > > > > > def simple():
> > > > > > > > import random, cStringIO
>
> > > > > > > > from matplotlib.backends.backend_agg import FigureCanvasAgg
> > > > > > > > as
> > > > > > > > FigureCanvas
> > > > > > > > from matplotlib.figure import Figure
> > > > > > > > from matplotlib.dates import DateFormatter
>
> > > > > > > > fig=Figure()
> > > > > > > > ax=fig.add_subplot(111)
> > > > > > > > x=[]
> > > > > > > > y=[]
> > > > > > > > now=datetime.datetime.now()
> > > > > > > > delta=datetime.timedelta(days=1)
> > > > > > > > for i in range(10):
> > > > > > > > x.append(now)
> > > > > > > > now+=delta
> > > > > > > > y.append(random.randint(0, 1000))
> > > > > > > > ax.plot_date(x, y, '-')
> > > > > > > > ax.xaxis.set_major_formatter(DateFormatter('%Y-%m-%d'))
> > > > > > > > fig.autofmt_xdate()
> > > > > > > > canvas=FigureCanvas(fig)
> > > > > > > > response.header['content-type']='image/png'
> > > > > > > > stream=cStringIO.StringIO()
> > > > > > > > canvas.print_png(stream)
> > > > > > > > return stream.getvalue()
>
> > > > > > > > Massimo
>
> > > > > > > > On Dec 16, 6:12 am, aus <[email protected]> wrote:
>
> > > > > > > > > Hi Massimo,
>
> > > > > > > > > thank you for your reply. Your suggestion does not seem to
> > > > > > > > > work, but
> > > > > > > > > maybe I'm not using Dojo properly. How would you code the
> > > > > > > > > plot with
> > > > > > > > > flot?
>
> > > > > > > > > Also, it would be great to be able to embed images/charts
> > > > > > > > > generated by
> > > > > > > > > matplotlib, similarly to what can be done with
> > > > > > > > > django:http://www.scipy.org/Cookbook/Matplotlib/Django. Is
> > > > > > > > > there a similar
> > > > > > > > > feature in web2py?
>
> > > > > > > > > Thank you!
>
> > > > > > > > > Cheers,
> > > > > > > > > aus
>
> > > > > > > > > On Dec 16, 6:57 am, mdipierro <[email protected]> wrote:
>
> > > > > > > > > > I do not know about Dojo. I have been using flot instead.
> > > > > > > > > > perhaps this
> > > > > > > > > > helps
>
> > > > > > > > > > {{import gluon.contrib.simplejson as sj}}
> > > > > > > > > > {{=sj.dumps(data)}}
>
> > > > > > > > > > data will be printed in the page in json format. If your
> > > > > > > > > > view/template
> > > > > > > > > > includes javascript code you can put the above statements
> > > > > > > > > > in the js
> > > > > > > > > > itself.
>
> > > > > > > > > > Perhaps other users can help more.
>
> > > > > > > > > > Massimo
>
> > > > > > > > > > On Dec 15, 11:31 pm, aus <[email protected]>
> > > > > > > > > > wrote:
>
> > > > > > > > > > > Hi everybody,
>
> > > > > > > > > > > although I have some experience with programming,
> > > > > > > > > > > javascript/AJAX is
> > > > > > > > > > > completely new to me. I'm very happy with web2py and I'm
> > > > > > > > > > > trying now to
> > > > > > > > > > > pass arrays and possibly more structured data to Dojox to
> > > > > > > > > > > plot series
> > > > > > > > > > > computed in python using Dojox's charts. How can I do
> > > > > > > > > > > that? I somehow
> > > > > > > > > > > cannot cross the wall between the templace code and the
> > > > > > > > > > > javascript
> > > > > > > > > > > code... Is JSON a possible solution? Could someone
> > > > > > > > > > > provide an example?
>
> > > > > > > > > > > thank you!
>
> > > > > > > > > > > Cheers,
> > > > > > > > > > > aus
>
>
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