Kivy python script for capturing displaying webcam

Kivy is very cool. It allows you to make graphical user interfaces for computers, tablets and smart phones ... in Python. Which is great for people like me. And you, I'm sure. And it's open source, of course.

Today was my first foray into programming using Kivy. Here was my first 'app'. It's not very sophisticated, but I find Kivy's documentation rather impenetrable and frustratingly lacking in examples. Therefore I hope more people like me post their code and projects on blogs.

Right, it detects and displays your webcam on the screen, draws a little button in the bottom. When you press that button it takes a screengrab and writes it to an image file. Voila! Maximise the window before you take a screen shot for best effects.

	import kivy
	kivy.require('1.7.2')
	from kivy.app import App
	from kivy.uix.floatlayout import FloatLayout
	from kivy.uix.camera import Camera
	from kivy.uix.button import Button
	from kivy.core.window import Window
	class CamApp(App):
	# Function to take a screenshot
	def screengrab(self,*largs):
	outname = self.fileprefix+'_%(counter)04d.png'
	Window.screenshot(name=outname)
	def build(self):
	# create a floating layout as base
	camlayout = FloatLayout(size=(600, 600))
	cam = Camera() #Get the camera
	cam=Camera(resolution=(1024,1024), size=(300,300))
	cam.play=True #Start the camera
	camlayout.add_widget(cam)
	button=Button(text='Take Picture',size_hint=(0.12,0.12))
	button.bind(on_press=self.screengrab)
	camlayout.add_widget(button) #Add button to Camera Layout
	self.fileprefix = 'snap'
	return camlayout
	if __name__ == '__main__':
	CamApp().run()

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