Sample code for drawing a circle using Pygame

trigonometric function

If we use OP as the radius r of the circle and point o as the center of the circle, the x-coordinate of the point on the circle is r * cos a , and the y-coordinate is r * sin a .

Python provides () and (), which require the arguments to be radians.

Relationship between radians and angles

PI stands for 180 degrees, and PI is pi: 3.1415926 535 897392 23846. python provides conversions for angles and radians

() Radian to angle

() Angle to radian

a = ((90))

The horizontal coordinate of 90 degrees is 0, but because the PI is not a floating-point decimal, it results in inaccurate arithmetic and is a value close to 0.

Basic Packages and Event Capture

Initialize the window, configure the center and radius of the circle, and add a timer to control the speed of the drawing.

import sys, random, math, pygame
from  import *

()
screen = .set_mode((600, 500))
.set_caption("Dream Circle.")
((0, 0, 100))

pos_x = 300
pos_y = 250
radius = 200
angle = 360

# Timers
mainClock = ()

while True:
    for event in ():
        if  == QUIT:
            ()
            ()

    keys = .get_pressed()
    if keys[K_ESCAPE]:
        ()
        ()

main program

The angle is constantly added, and if it exceeds 360 degrees it restarts at 1, randomizes a color, calculates the point on the great circle at that angle, and draws a circle with a radius of 10 with that point.

angle += 1
    if angle >= 360:
        angle = 0

    r = (0, 255)
    g = (0, 255)
    b = (0, 255)
    color = r, g, b

    x = ((angle)) * radius
    y = ((angle)) * radius

    pos = (int(pos_x + x), int(pos_y + y))
    (screen, color, pos, 10, 0)

    ()
    (20)

All Codes

import sys, random, math, pygame
from  import *

()
screen = .set_mode((600, 500))
.set_caption("Dream Circle.")
((0, 0, 100))

pos_x = 300
pos_y = 250
radius = 200
angle = 360

# Timers
mainClock = ()

while True:
    for event in ():
        if  == QUIT:
            ()
            ()

    keys = .get_pressed()
    if keys[K_ESCAPE]:
        ()
        ()

    angle += 1
    if angle >= 360:
        angle = 0

    r = (0, 255)
    g = (0, 255)
    b = (0, 255)
    color = r, g, b

    x = ((angle)) * radius
    y = ((angle)) * radius

    pos = (int(pos_x + x), int(pos_y + y))
    (screen, color, pos, 10, 0)

    ()
    (10)

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