[pygame] Rotation About A Point

[ANKUR AGGARWAL <coolankur2006@xxxxxxxxx>]

Hey I want to rotate the image about a point (100,100) but by using
the pygame.tranform.rotate image moves itself from the point along
with the rotation . Below is the code


import pygame
from pygame.locals import *
from sys import exit

pygame.init()
screen=pygame.display.set_mode((640,480),0,0)
pygame.display.set_caption("Rotation using transform module")

image=pygame.image.load("fugu.png").convert_alpha()
a=0
clock=pygame.time.Clock()
b=(100,100)
while True:
 for i in pygame.event.get():
  if i.type==QUIT:
   exit()
 screen.fill((0,0,0))
 a=a+10
 image=pygame.transform.rotate(image,a)
 screen.blit(image,(100,100))
 pygame.display.update()
 clock.tick(1)

Whats my mistake and whats the solution???
Thanks
Ankur Aggarwal