Re: [pygame] Rotate image around another point?

[John Eriksson <john@xxxxxxxxxxxx>]

Well, no.

I'm looking for a way to rotate the imagedata (like
pygame.transform.rotate(...)) but your example rotates the image
location. Right?

/John

tor 2007-04-19 klockan 10:36 +0200 skrev altern:
> hi john
> 
> John Eriksson(e)k dio:
> > Hi,
> > 
> > The rotate function in the transform module rotates an image about its
> > center. But what if I want to use another point?
> > 
> > Is there another solution than to modify the size of the image to change
> > its center point?
> 
> I think something like this should do what you are looking for.
> 
> from math import *
> 
> def rotPoint(point, axis, ang):
>      """ Orbit. calcs the new loc for a point that rotates a given num 
> of degrees around an axis point,
>          +clockwise, -anticlockwise -> tuple x,y
>      """
>      x, y = point[0] - axis[0], point[1] - axis[1]
>      radius = sqrt(x*x + y*y) # get the distance between points
> 
>      RAng = radians(ang)       # convert ang to radians.
> 
>      h = axis[0] + ( radius * cos(RAng) )
>      v = axis[1] + ( radius * sin(RAng) )
> 
>      return h, v
> 
> 
> myimage.center = rotPoint(myimage.center, (300,300), 45)
> 
> this line should rotate myimage.center around point (300,300) by 45 degrees
> 
> 
> > Best Regards
> > /John Eriksson
> > 
> >