Having trouble getting an object to move in a circle

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With what I currently have, my circle just flies away in a straight line. I'm trying to get the circle to spin around the other circle but the circular movement just isn't happening. I am very new to coding. Thank you in advance!

from graphics import *

def main():
    winName = input ("What would you like the name of the window to be? ")
    color1 = input("What color would you like the circle to be? ")
    x1, y1 = eval(input("What are the x, y coordinates of the center of the circle? "))
    radius1 = eval(input("What is the radius of the circle? "))

    win = GraphWin (winName, 500, 500)

    center1 = Point (x1, y1)
    circ1 = Circle (center1, radius1)
    circ1.setFill (color1)
    circ1.draw (win)

    color2 = ('green')
    x2 = x1
    y2 = y1 - (2 * radius1)
    radius2 = radius1 * (1/2)

    center2 = Point (x2, y2)
    circ2 = Circle (center2, radius2)
    circ2.setFill (color2)
    circ2.draw (win)

    line = Line (center1, center2)
    line.setFill('red')
    line.draw(win)

    for i in range(5):
        hyp = radius1 * 2
        leg = x2 - x1
        theta = math.acos(leg/hyp)
        circ2.move(x1 + (math.cos(theta) * (radius1 * 2)), y1 + (math.sin(theta) * (radius1 * 2)))
        line.undraw()
        time.sleep(1)

    newCenter = (circ2.getCenter(), center1)

    line = Line(circ2.getCenter(), center1)
    line.setFill('red')
    line.draw(win)

main()

What I have tried:

I have tried many different math formulas to try and get different values that could be useful but none seem to work.

Posted 21-Sep-22 9:44am

Sammy 2022

Updated 21-Sep-22 20:49pm

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OriginalGriff · Answer 1 · 2022-09-21T18:34:00

5 values are not enough to draw a circle: they draw a rough pentagram (ish) and will only approximate a circle for tiny radii.

Change the range(5) to a higher value - 100 or so, and increase theta by 2π / 100 each time round the loop (2π radians is 360^o so the angle needs to change through the whole 2π radian range for a complete circle).

The exact number or points you need to plot will depend on the radius of the circle: the bigger it is the more points you need to get a smooth surface.

CPallini · Answer 2 · 2022-09-21T20:49:00

You could start using simple constant values, in order to better understand what is happening.
Try, for instance

Python

from graphics import *
import math

def main():

    winName = "circles"
    win = GraphWin (winName, 500, 500)

    color1 = "red"
    x1 = 250
    y1 = 250
    radius1 = 125


    center1 = Point (x1, y1)
    circ1 = Circle (center1, radius1)
    circ1.setFill (color1)
    circ1.draw (win)

    color2 = "green"
    radius2 = radius1/2
    x2 = x1
    y2 = y1 - (radius1+radius2)

    center2 = Point (x2, y2)
    circ2 = Circle (center2, radius2)
    circ2.setFill (color2)
    circ2.draw (win)


    phi = 0
    while phi < 2*math.pi:
        nx = x1 + (radius1+radius2) * math.sin(phi)
        ny = y1 + (radius1+radius2) * math.cos(phi)
        dx = nx-x2
        dy = ny-y2
        x2 = nx
        y2 = ny
        circ2.move(dx,dy)
        phi = phi+math.pi/100
        time.sleep(.1)

main()

Having trouble getting an object to move in a circle

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