What about drawing with one finger? Can we recognize gestures? It is possible to do this with Kivy. First, we need to record the gestures that we want to use. A gesture is represented as a long string that contains the points of a stroke over the screen. The following code uses the Kivy Gesture and GestureDatabase classes to record gesture strokes. It can be run with Python gesturerecorder.py:
180. # File Name: gesturerecorder.py 181. from kivy.app import App 182. from kivy.uix.floatlayout import FloatLayout 183. from kivy.graphics import Line, Ellipse 184. from kivy.gesture import Gesture, GestureDatabase 185. 186. class GestureRecorder(FloatLayout): 187. 188. def on_touch_down(self, touch): 189. self.points = [touch.pos] 190. with self.canvas: 191. Ellipse(pos=(touch.x-5,touch.y-5),size=(10,10)) 192. self.Line = Line(points=(touch.x, touch.y)) 193. 194. def on_touch_move(self, touch): 195. ...