I want to slowly draw a circle in pygame so the act of drawing is actually visible to the naked eye. I got a function on stackoverflow to draw a straight line by incrementing the end point and keeping the starting point same but couldn't figure out how to slowly draw a circle in the pygame screen.
x = r * cos(radians(i)) + a
y = r * sin(radians(i)) + b
Where a
is the x
coordinate of the center of the circle, and b
is the y
coordinate of the center of the circle r
is the radius of the circle.
To slow down the animation, use a Clock
object. You can access the functions sin
and cos
from the built-in math
module (note that you'll need to pass in the values as radians, hence the importation of the radians
function) .
import pygame
from math import sin, cos, radians
pygame.init()
wn = pygame.display.set_mode((600, 600))
r = 100
a = 300
b = 200
clock = pygame.time.Clock()
for i in range(1, 361):
clock.tick(30)
pygame.draw.circle(wn, (255, 255, 255), (int(r * cos(radians(i)) + a), int(r * sin(radians(i)) + b)), 2)
pygame.display.update()
Output:
If you prefer to use standard lines as the outline instead of overlapping dots, use the pygame.draw.line
function like so:
import pygame
from math import sin, cos, radians
pygame.init()
wn = pygame.display.set_mode((600, 600))
r = 100
a = 300
b = 200
def x_y(r, i, a, b):
return (int(r * cos(radians(i)) + a), int(r * sin(radians(i)) + b))
clock = pygame.time.Clock()
for i in range(0, 360, 2):
clock.tick(30)
pygame.draw.line(wn, (255, 255, 255), x_y(r, i, a, b), x_y(r, i+1, a, b), 2)
pygame.display.update()
I recommend using the turtle library because it contains a circle function. For example circle(40) would draw a circle with a radius of 40 units. When you run the program the circle will be drawn in front of you
Your question states your main aim is to just draw a circle, so I would suggest you to consider using turtle.
You can run these codes and get the output:
import turtle
t = turtle.Turtle()
t.circle(50)
import pygame
pygame.init()
screen = pygame.display.set_mode((626, 416))
pygame.draw.circle(screen, (r,g,b), (x, y), R, w)
running = True
while running:
pygame.display.update()
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
This is how you can draw a circle on a pygame screen with (r, g, b)
as color, (x, y)
as center, R
as radius and w
as the thickness of the circle.
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