96 lines
2.9 KiB
Python
96 lines
2.9 KiB
Python
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from kivy.app import App
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from kivy.uix.floatlayout import FloatLayout
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from kivy.graphics import Color, Ellipse, Line
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from kivy.gesture import Gesture, GestureDatabase
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from my_gestures import cross, circle, check, square
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def simplegesture(name, point_list):
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"""
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A simple helper function
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"""
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g = Gesture()
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g.add_stroke(point_list)
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g.normalize()
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g.name = name
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return g
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class GestureBoard(FloatLayout):
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"""
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Our application main widget, derived from touchtracer example, use data
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constructed from touches to match symbols loaded from my_gestures.
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"""
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def __init__(self, *args, **kwargs):
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super(GestureBoard, self).__init__()
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self.gdb = GestureDatabase()
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# add pre-recorded gestures to database
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self.gdb.add_gesture(cross)
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self.gdb.add_gesture(check)
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self.gdb.add_gesture(circle)
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self.gdb.add_gesture(square)
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def on_touch_down(self, touch):
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# start collecting points in touch.ud
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# create a line to display the points
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userdata = touch.ud
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with self.canvas:
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Color(1, 1, 0)
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d = 30.
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Ellipse(pos=(touch.x - d / 2, touch.y - d / 2), size=(d, d))
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userdata['line'] = Line(points=(touch.x, touch.y))
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return True
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def on_touch_move(self, touch):
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# store points of the touch movement
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try:
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touch.ud['line'].points += [touch.x, touch.y]
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return True
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except (KeyError) as e:
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pass
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def on_touch_up(self, touch):
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# touch is over, display information, and check if it matches some
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# known gesture.
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g = simplegesture('', list(zip(touch.ud['line'].points[::2],
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touch.ud['line'].points[1::2])))
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# gestures to my_gestures.py
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print("gesture representation:", self.gdb.gesture_to_str(g))
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# print match scores between all known gestures
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print("cross:", g.get_score(cross))
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print("check:", g.get_score(check))
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print("circle:", g.get_score(circle))
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print("square:", g.get_score(square))
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# use database to find the more alike gesture, if any
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g2 = self.gdb.find(g, minscore=0.70)
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print(g2)
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if g2:
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if g2[1] == circle:
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print("circle")
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if g2[1] == square:
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print("square")
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if g2[1] == check:
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print("check")
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if g2[1] == cross:
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print("cross")
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# erase the lines on the screen, this is a bit quick&dirty, since we
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# can have another touch event on the way...
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self.canvas.clear()
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class DemoGesture(App):
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def build(self):
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return GestureBoard()
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if __name__ == '__main__':
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DemoGesture().run()
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