I am trying to figure out how to use flask to just show a simple image and update with a new image. I have the following that seems to work just fine for images (pretty much right from MPL website):
@app.route("/image")
def show_image():
to_show = do_stuff(os.listdir( current_dir )[-1] ) #turn file into 2d np.array
fig, ax = plt.subplots()
ax.imshow( to_show, **plot_pars)
buf = BytesIO()
fig.savefig(buf, format = "png")
plot_url = base64.b64encode(buf.getvalue().decode("utf8")
return render_template("index.html", plot_url = plot_url)
The index.html file is currently setup to refresh every 15 seconds
<!DOCTYPE html>
<html>
<head>
<title> Plot</title>
<meta http-equiv='refresh' content="15>
</head>
<body>
<img src="data:image/png;base64, {{ plot_url }}">
</body>
</html>
I am curious if I can set something up that will basically run show_image if the length of my current_dir changes. If I try it in my show_image function (if os.listdir( current_dir) != nfiles ), but nothing changes, so I am trying to figure out the best way to start with this "trigger".
