June 2015
Intermediate to advanced
206 pages
4h 32m
English
Content preview from Kivy - Interactive Applications and Games in PythonBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Recording gestures – line, circle, and cross
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 ...