Line between circle widgets

[Yunis Hüseynov]

Need Help

How can I draw lines between these points that attaches them also during dragg movement via widget properties?

import os

os.environ['KIVY_GL_BACKEND'] = 'sdl2'

from kivy.app import App

from kivy.lang import Builder

from kivy.uix.screenmanager import ScreenManager, Screen

from kivy.uix.widget import Widget

from kivy.graphics import Rotate, Rectangle, Line, Ellipse, Color

from kivy.core.window import Window

from kivy.uix.boxlayout import BoxLayout

from kivy.uix.button import Button

from kivy.uix.label import Label

from kivy.core.window import Window

from random import randint

Builder.load_string("""

<MainScreen>:

BoxLayout:

orientation: 'vertical'

Button:

text: ''

background_color: 0,0,0,1

size_hint:1.,0.5

Button:

text: 'Moderate curve or straight canals'

background_color: 128,0,0,1

font_size: 40

size_hint:1.,0.7

on_press: root.manager.transition.direction = 'left'

on_press: root.manager.current = 'straight'

<StraightScreen>:

BoxLayout:

id: straightscreen

orientation: 'horizontal'

RootWidget:

# pos:200,2000

""")

class MainScreen(Screen):

pass

class LearnScreen(Screen):

pass

# class StraightScreen(Screen):

# pass

class StraightScreen(Screen):

pass

class CircleWidget1(Widget):

def __init__(self, **kwargs):

super(CircleWidget1, self).__init__(**kwargs)

self.size = (20, 20)

with self.canvas:

Color(0, 0, 1, 1)

self.circle = Ellipse(pos=self.pos, size=self.size)

circle2=self.add_widget(CircleWidget2(pos=(200,200), size=(2,2)))

circle3=self.add_widget(CircleWidget3(pos=(200,100), size=(2,2)))

self.bind(pos=self.redraw, size=self.redraw)

def redraw(self, *args):

self.circle.size = self.size

self.circle.pos = self.pos

def on_touch_down(self, touch):

if self.collide_point(*touch.pos):

# if the touch collides with our widget, let's grab it

touch.grab(self)

# and accept the touch.

return True

return super(CircleWidget1, self).on_touch_down(touch)

def on_touch_up(self, touch):

# check if it's a grabbed touch event

if touch.grab_current is self:

# don't forget to ungrab ourself, or you might have side effects

touch.ungrab(self)

# and accept the last up

return True

return super(CircleWidget1, self).on_touch_up(touch)

def on_touch_move(self, touch):

# check if it's a grabbed touch event

if touch.grab_current is self:

self.pos = touch.pos

# and accept the last move

return True

return super(CircleWidget1, self).on_touch_move(touch)

class CircleWidget2(Widget):

def __init__(self, **kwargs):

super(CircleWidget2, self).__init__(**kwargs)

self.size = (20, 20)

with self.canvas:

Color(1,0, 0, 1)

self.circle = Ellipse(pos=self.pos, size=self.size)

self.bind(pos=self.redraw, size=self.redraw)

def redraw(self, *args):

self.circle.size = self.size

self.circle.pos = self.pos

def on_touch_down(self, touch):

if self.collide_point(*touch.pos):

# if the touch collides with our widget, let's grab it

touch.grab(self)

# and accept the touch.

return True

return super(CircleWidget2, self).on_touch_down(touch)

def on_touch_up(self, touch):

# check if it's a grabbed touch event

if touch.grab_current is self:

# don't forget to ungrab ourself, or you might have side effects

touch.ungrab(self)

# and accept the last up

return True

return super(CircleWidget2, self).on_touch_up(touch)

def on_touch_move(self, touch):

# check if it's a grabbed touch event

if touch.grab_current is self:

self.pos = touch.pos

# and accept the last move

return True

return super(CircleWidget2, self).on_touch_move(touch)

class CircleWidget3(Widget):

def __init__(self, **kwargs):

super(CircleWidget3, self).__init__(**kwargs)

self.size = (20, 20)

with self.canvas:

Color(0,1,0,1)

self.circle = Ellipse(pos=self.pos, size=self.size)

self.bind(pos=self.redraw, size=self.redraw)

def redraw(self, *args):

self.circle.size = self.size

self.circle.pos = self.pos

def on_touch_down(self, touch):

if self.collide_point(*touch.pos):

# if the touch collides with our widget, let's grab it

touch.grab(self)

# and accept the touch.

return True

return super(CircleWidget3, self).on_touch_down(touch)

def on_touch_up(self, touch):

# check if it's a grabbed touch event

if touch.grab_current is self:

# don't forget to ungrab ourself, or you might have side effects

touch.ungrab(self)

# and accept the last up

return True

return super(CircleWidget3, self).on_touch_up(touch)

def on_touch_move(self, touch):

# check if it's a grabbed touch event

if touch.grab_current is self:

self.pos = touch.pos

# and accept the last move

return True

return super(CircleWidget3, self).on_touch_move(touch)

class RootWidget(Widget):

def __init__(self, **kwargs):

super(RootWidget, self).__init__(**kwargs)

circle1=self.add_widget(CircleWidget1(pos=(200,300), size=(2,2)))

sm = ScreenManager()

sm.add_widget(StraightScreen(name='straight'))

class Yendo(App):

def build(self):

return sm

if __name__ == '__main__':

Yendo().run()

[Moazzam Muhammad]

Try to make this question observable OR make easy.