/usr/share/kivy-examples/demo/touchtracer/main.py is in python-kivy-examples 1.8.0+dfsg-2.1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | #!/usr/bin/kivy
import kivy
kivy.require('1.0.6')
from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.label import Label
from kivy.graphics import Color, Rectangle, Point, GraphicException
from random import random
from math import sqrt
def calculate_points(x1, y1, x2, y2, steps=5):
dx = x2 - x1
dy = y2 - y1
dist = sqrt(dx * dx + dy * dy)
if dist < steps:
return None
o = []
m = dist / steps
for i in range(1, int(m)):
mi = i / m
lastx = x1 + dx * mi
lasty = y1 + dy * mi
o.extend([lastx, lasty])
return o
class Touchtracer(FloatLayout):
def on_touch_down(self, touch):
win = self.get_parent_window()
ud = touch.ud
ud['group'] = g = str(touch.uid)
with self.canvas:
ud['color'] = Color(random(), 1, 1, mode='hsv', group=g)
ud['lines'] = (
Rectangle(pos=(touch.x, 0), size=(1, win.height), group=g),
Rectangle(pos=(0, touch.y), size=(win.width, 1), group=g),
Point(points=(touch.x, touch.y), source='particle.png',
pointsize=5, group=g))
ud['label'] = Label(size_hint=(None, None))
self.update_touch_label(ud['label'], touch)
self.add_widget(ud['label'])
touch.grab(self)
return True
def on_touch_move(self, touch):
if touch.grab_current is not self:
return
ud = touch.ud
ud['lines'][0].pos = touch.x, 0
ud['lines'][1].pos = 0, touch.y
points = ud['lines'][2].points
oldx, oldy = points[-2], points[-1]
points = calculate_points(oldx, oldy, touch.x, touch.y)
if points:
try:
lp = ud['lines'][2].add_point
for idx in range(0, len(points), 2):
lp(points[idx], points[idx+1])
except GraphicException:
pass
ud['label'].pos = touch.pos
import time
t = int(time.time())
if t not in ud:
ud[t] = 1
else:
ud[t] += 1
self.update_touch_label(ud['label'], touch)
def on_touch_up(self, touch):
if touch.grab_current is not self:
return
touch.ungrab(self)
ud = touch.ud
self.canvas.remove_group(ud['group'])
self.remove_widget(ud['label'])
def update_touch_label(self, label, touch):
label.text = 'ID: %s\nPos: (%d, %d)\nClass: %s' % (
touch.id, touch.x, touch.y, touch.__class__.__name__)
label.texture_update()
label.pos = touch.pos
label.size = label.texture_size[0] + 20, label.texture_size[1] + 20
class TouchtracerApp(App):
title = 'Touchtracer'
icon = 'icon.png'
def build(self):
return Touchtracer()
def on_pause(self):
return True
if __name__ == '__main__':
TouchtracerApp().run()
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