midpointdraw.py

import pygame, sys
from pygame.locals import *
from pygame import gfxdraw

# set up the window
windowSurface = pygame.display.set_mode((500, 400), 0, 32)
pygame.display.set_caption('Hello world!')

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


isRunning = True

def testDraw(surface, center_x, center_y, rad, coef=1):
    x, y = 0, rad
    while (x <= y):
        gfxdraw.pixel(surface, center_x + x, center_y + y, (255, 255, 0))
        gfxdraw.pixel(surface, center_x - x, center_y + y, (255, 255, 0))
        gfxdraw.pixel(surface, center_x + x, center_y - y, (255, 255, 0))
        gfxdraw.pixel(surface, center_x - x, center_y - y, (255, 255, 0))
        gfxdraw.pixel(surface, center_x + y, center_y + x, (255, 255, 0))
        gfxdraw.pixel(surface, center_x - y, center_y + x, (255, 255, 0))
        gfxdraw.pixel(surface, center_x + y, center_y - x, (255, 255, 0))
        gfxdraw.pixel(surface, center_x - y, center_y - x, (255, 255, 0))
        x += 1
        if ( abs(x * x + y*y -rad*rad) > abs(x*x + (y-coef) * (y-coef) - rad* rad) ):
            y -= 1


while isRunning:
    for event in pygame.event.get():
        keys = pygame.key.get_pressed()
        if event.type == pygame.QUIT:
            isRunning = False
        elif event.type == pygame.KEYDOWN and keys[K_a]:
            testDraw(windowSurface, 200, 200, 100)
            print("Pressed a key")