tkinter example two circles (snippet)

Python tkinter (gui) example 'two circles'

Functions in program:

def distance(x1, y1, x2, y2):

Modules used in program:

import math

two circles

Python tkinter example: two circles

from tkinter import * # Import tkinter
import math

width = 400
height = 250
radius = 2
radius = 20

class Circle:
    def __init__(self, x, y, radius):
        self.x = x
        self.y = y
        self.radius = radius

    # Is point (x, y) inside this circle?
    def isInside(self, x, y):
        return distance(self.x, self.y, x, y) <= self.radius

class MainGUI:
    def __init__(self):       
        window = Tk() # Create a window
        window.title("TwoCircles") # Set title

        self.canvas = Canvas(window, width = width, height = height)
        self.canvas.pack()

        self.x = 100
        self.y = 100

        self.c1 = Circle(20, 20, radius)
        self.c2 = Circle(120, 50, radius)
        self.paint()

        self.canvas.bind("<B1-Motion>", self.mouseMoved)

        window.mainloop() # Create an event loop    

    def mouseMoved(self, event):
        if self.c1.isInside(event.x, event.y) and distance(event.x, event.y, self.c2.x, self.c2.y) > 70:
            self.c1.x = event.x
            self.c1.y = event.y
        elif self.c2.isInside(event.x, event.y) and distance(self.c1.x, self.c1.y, event.x, event.y) > 70:
            self.c2.x = event.x
            self.c2.y = event.y

        self.canvas.delete("line")
        self.paint()

    def paint(self):
        c1 = self.c1
        c2 = self.c2
        self.canvas.create_oval(c1.x - c1.radius, c1.y - c1.radius, c1.x + c1.radius, c1.y + c1.radius, fill = "red", activefill = "gold", tags = "line")
        self.canvas.create_oval(c2.x - c2.radius, c2.y - c1.radius, c2.x + c2.radius, c2.y + c2.radius, fill = "red", activefill = "gold", tags = "line")
        self.canvas.create_line(c1.x, c1.y, c2.x, c2.y, tags = "line")
        self.canvas.create_text((c1.x + c2.x) / 2, (c1.y + c2.y) / 2, text = str("{0:0.2f}".format(distance(c1.x, c1.y, c2.x, c2.y))), tags = "line")

def distance(x1, y1, x2, y2):
    return ((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)) ** 0.5

MainGUI()

Useful links

Learn Tkinter: https://pythonbasics.org/tkinter/
Wikipedia tkinter: https://en.wikipedia.org/wiki/Tkinter