How to use matplotlib in Plone

问题

I am using Plone 4.3 with matplotlib. I have the plot window but I want to render the plot window in a page template. Some folks suggested I use HTML5 canvas to render the plot window in a template page. But I am unable to grasp that concept. So anyone can help me?

回答1:

Create a browser view, set the header type, and return the image data e.g.

from zope.publisher.browser import BrowserPage


class PloneMatPlotLib(BrowserPage):
    """
    """

    def __call__(self):

        import cStringIO
        from matplotlib.figure import Figure
        from matplotlib.backends.backend_agg import FigureCanvasAgg

        x, y = 4, 4

        fig = Figure(figsize=[x, y])
        ax = fig.add_axes([.1, .1, .8, .8])
        ax.scatter([1, 2], [3, 4])
        canvas = FigureCanvasAgg(fig)

        # write image data to a string buffer and get the PNG image bytes
        buf = cStringIO.StringIO()
        canvas.print_png(buf)
        data = buf.getvalue()

        # write image bytes back to the browser
        self.request.response.setHeader("Content-type", "image/png")
        return data

You can then call this view TTW (through the web) to get the image e.g. http://localhost:8080/Plone/@@plone_matplotlib. Or in a page template e.g.:

<div metal:use-macro="here/main_template/macros/master">
    <div metal:fill-slot="main">
       <img tal:attributes="src python:context.absolute_url() + '/@@plone_matplotlib'">
    </div>
</div>

More here:

• https://github.com/aclark4life/plone_matplotlib

来源：https://stackoverflow.com/questions/23779160/how-to-use-matplotlib-in-plone