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 xrange(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'])

    def on_touch_move(self, touch):
        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 xrange(0, len(points), 2):
                    lp(points[idx], points[idx+1])
            except GraphicException:
                pass

        ud['label'].pos = touch.pos
        self.update_touch_label(ud['label'], touch)

    def on_touch_up(self, touch):
        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()

if __name__ in ('__main__', '__android__'):
    TouchtracerApp().run()
