Re: [pygame] Making a clock rotate

[dialtone <dialtone@aruba.it>]

Pete Shinners wrote:

> btw, the get_rect() for a surface always returns a rectangle with the 
> topleft corner at 0, 0 and width,height set to the dimensions of the 
> image. so on our last line you can see we shortcut the get_rect()
I got it rotating, thx for your help Pete. But I have a problem more... 
I cannot manage to keep the rotation point in the center of the surface. 
My code now is this: (The problem is that the pointer progressively goes 
away of the surface till it goes completely out. Can you help me to 
correct the newrect() function which I suspect is the main responsible 
for this bad behave? Thx a lot)

import pygame
from pygame.locals import *
import time
import math

def load_image(name, colorkey=None):
   try:
       image = pygame.image.load(name)
   except pygame.error, message:
       print 'Cannot load image:', name
       raise SystemExit, message
   image = image.convert()
   if colorkey is not None:
       if colorkey is -1:
           colorkey = image.get_at((0,0))
       image.set_colorkey(colorkey, RLEACCEL)
   return image, image.get_rect()
  
def newrect(oldrect, degree):
   adegree = abs(degree)
   if adegree in xrange(0,90):
       width = 128+int(oldrect[2]*math.cos(degree) + 
oldrect[3]*math.sin(degree))
       height = int(oldrect[2]*math.sin(degree) + 
oldrect[3]*math.cos(degree))
       topx, topy = 0, 0
       return pygame.Rect(topx, topy, width, height)
   if adegree in xrange(91,180):
       width = int(oldrect[2]*math.cos(degree) + 
oldrect[3]*math.sin(degree))
       height = int(oldrect[2]*math.sin(degree) + 
oldrect[3]*math.sin(degree))
       topx, topy = 0, 0
       return pygame.Rect(topx, topy, 128+width,128+height)
   if adegree in xrange(181,270):
       width = int(oldrect[2]*math.cos(degree) + 
oldrect[3]*math.sin(degree))
       height = int(oldrect[2]*math.sin(degree) + 
oldrect[3]*math.cos(degree))
       topx, topy = 0, 0
       return pygame.Rect(topx, topy, width, height)
   if adegree in xrange(271, 360):
       width =  int(oldrect[2]*math.sin(degree) + 
oldrect[3]*math.cos(degree))
       height =  int(oldrect[2]*math.cos(degree) + 
oldrect[3]*math.sin(degree))
       topx, topy = 0, 0
       return pygame.Rect(topx, topy, width, height)

class orologio:
   def __init__(self):
       self.quadrante = pygame.display.set_mode((256,256))
       self.image, self.rect = 
load_image('/home/dialtone/Documents/lancetta.jpg')
       self.rect = (126, 0, self.rect[2], self.rect[3])            # 
Adjust rectangle
       self.orig_rect = self.rect[:]
       self.quadrante.blit(self.image, self.rect)
  
   def update(self, degree):
       self.degree = degree
       #self.quadrante.blit(self.image, (120,0))
       self.image = pygame.transform.rotozoom(self.image, self.degree, 1)
       self.rect = newrect(self.orig_rect, self.degree)
       #self.rect = self.image.get_rect()
       self.quadrante.blit(self.image, self.rect)
       pygame.display.update()
       pygame.time.wait(1000)
      
if __name__=='__main__':
   pygame.init()
   clock = orologio()
   degrees = 0
   while 1:
       if abs(degrees) >= 360: degrees = 0
       clock.update(degrees)
       degrees -= 6

--
try: troll.uses(Brain)
except TypeError, data: 
  troll.plonk()
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