Bresenham line drawing in Python using Pygame

gistfile1.py

import sys,pygame
from pygame import gfxdraw

pygame.init()
screen = pygame.display.set_mode((400,400))
screen.fill((0,0,0))
pygame.display.flip()
white = (255,255,255)

def bresenham(x1,y1,x2,y2):
	dx = x2-x1
	dy = y2-y1

	D = 2*dy - dx
	gfxdraw.pixel(screen,x1,y1,white)
	y = y1

	for x in range(x1+1,x2+1):
		if D > 0:
			y += 1
			gfxdraw.pixel(screen,x,y,white)
			D += (2*dy-2*dx)
		else:
			gfxdraw.pixel(screen,x,y,white)
			D += 2*dy
	pygame.display.flip()

bresenham(10,10,50,50)

while 1:
	for event in pygame.event.get():
		if event.type == pygame.QUIT: sys.exit()

c++

void bresenham(Screen* screen,Texture* texture,int startX,int startY,int endX,int endY){
	int biggerX=startX>endX ? startX : endX;
	int smallerX=startX<endX ? startX : endX;

	int biggerY=startY>endY ? startY : endY;
	int smallerY=startY<endY ? startY : endY;

	int diffX=biggerX-smallerX;
	int diffY=biggerY-smallerY;

	int D=2*diffY-diffX;
	screen->screen[smallerY][smallerX]=texture;
	int y=startY>endY ? endY : startY;

	for (int x=smallerX;x<biggerX;x++){
		if (D>0){
			y++;
			if ((x>=screen->cols)||(y>=screen->rows)){
				break;
			}
			screen->screen[y][x]=texture;
			D += (2*diffY-2*diffX);
		}else{
			if ((x>=screen->cols)||(y>=screen->rows)){
				break;
			}
			screen->screen[y][x]=texture;
			D += 2*diffY;
		}
	}
}