mirror of https://github.com/kivy/kivy.git
84 lines
2.4 KiB
Python
84 lines
2.4 KiB
Python
import kivy
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kivy.require('1.0.6')
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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.uix.label import Label
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from kivy.graphics import Color, Rectangle, Point
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from random import random
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from math import sqrt
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def calculate_points(x1, y1, x2, y2, steps=5):
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dx = x2 - x1
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dy = y2 - y1
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dist = sqrt(dx * dx + dy * dy)
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if dist < steps:
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return None
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o = []
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m = dist / steps
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for i in xrange(1, int(m)):
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mi = i / m
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lastx = x1 + dx * mi
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lasty = y1 + dy * mi
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o.extend([lastx, lasty])
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return o
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class Touchtracer(FloatLayout):
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def on_touch_down(self, touch):
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win = self.get_parent_window()
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ud = touch.ud
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ud['group'] = g = str(touch.uid)
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with self.canvas:
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ud['color'] = Color(random(), 1, 1, mode='hsv', group=g)
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ud['lines'] = (
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Rectangle(pos=(touch.x, 0), size=(1, win.height), group=g),
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Rectangle(pos=(0, touch.y), size=(win.width, 1), group=g),
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Point(points=(touch.x, touch.y), source='particle.png',
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pointsize=5, group=g))
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ud['label'] = Label(size_hint=(None, None))
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self.update_touch_label(ud['label'], touch)
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self.add_widget(ud['label'])
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def on_touch_move(self, touch):
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ud = touch.ud
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ud['lines'][0].pos = touch.x, 0
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ud['lines'][1].pos = 0, touch.y
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points = ud['lines'][2].points
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oldx, oldy = points[-2], points[-1]
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points = calculate_points(oldx, oldy, touch.x, touch.y)
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if points:
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lp = ud['lines'][2].add_point
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for idx in xrange(0, len(points), 2):
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lp(points[idx], points[idx+1])
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ud['label'].pos = touch.pos
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self.update_touch_label(ud['label'], touch)
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def on_touch_up(self, touch):
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ud = touch.ud
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self.canvas.remove_group(ud['group'])
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self.remove_widget(ud['label'])
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def update_touch_label(self, label, touch):
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label.text = 'ID: %s\nPos: (%d, %d)\nClass: %s' % (
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touch.id, touch.x, touch.y, touch.__class__.__name__)
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label.texture_update()
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label.pos = touch.pos
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label.size = label.texture_size[0] + 20, label.texture_size[1] + 20
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class TouchtracerApp(App):
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title = 'Touchtracer'
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icon = 'icon.png'
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def build(self):
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return Touchtracer()
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if __name__ in ('__main__', '__android__'):
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TouchtracerApp().run()
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