Very cool! I might use this sometime :)
On Wed, Mar 12, 2008 at 8:06 PM, Kris Schnee <[EMAIL PROTECTED]> wrote:
> Just thought I'd offer this function, which might be useful for
> characters with following behavior. It finds the angle from one point to
> another, in degrees, with 0 being "up" and 90 being "right." It's
> therefore useful for deciding whether a target is to a character's right
> etc., and it's easily changed if you don't like the scale I used.
>
> --
>
> import math
> def AngleToTarget(dx,dy):
> """Returns the angle to a point (dx,xy) in degrees.
>
> 0==up/north, 90==right/east, 180==down/south, 270==left/west.
> """
> if dx == 0: ## Special case to prevent zero-division
> if dy > 0:
> return 180
> elif dy < 0:
> return 0
> else:
> return None
>
> oa = float(dy)/float(dx)
> theta = math.degrees(math.atan(oa)) + 90.0
>
> if dx > 0:
> return theta
> else:
> return 180+theta
>
> return theta
>
>
> ## Demonstrate the function graphically: show angle from a "sun" to your
> cursor.
> import pygame
> pygame.init()
> from pygame.locals import *
> s = pygame.display.set_mode((500,500))
> font = pygame.font.Font(None,36)
> done = False
> while not done:
> for event in pygame.event.get():
> if event.type == KEYDOWN:
> done = True
>
> x, y = pygame.mouse.get_pos()
> dx, dy = x-250, y-250
> theta = AngleToTarget(dx,dy)
> s.fill((0,0,0))
> pygame.draw.circle(s,(255,255,64),(250,250),10)
> t = font.render(str(int(theta)),1,(255,255,255))
> pygame.draw.line(s,(128,128,128),(250,250),(x,y))
> s.blit(t,(0,0))
> pygame.display.update()
>
>
--
- pymike (pymike.blogspot.com)
