he has r=200 so nothing to do with rounding errors On Tue, Apr 28, 2015 at 2:46 PM, Jeffrey Kleykamp < jeffrey.kleyk...@gmail.com> wrote:
> It might be a rounding issue. rect.x is always the nearest integer I > think. It's better to store position as a float and then only round when > drawing. > > On Tue, Apr 28, 2015 at 4:28 PM, Charles Cossé <cco...@gmail.com> wrote: > >> Well I just spent 15 minutes looking at your code ... nothing obvious >> jumps out, except inconsistent use of variables and representations. Let >> me ask: Can you write a simple pygame program that makes a sprite move in a >> circle, yourself, right now? >> >> On Tue, Apr 28, 2015 at 11:10 AM, Charles Cossé <cco...@gmail.com> wrote: >> >>> Hi, >>> >>> Typically x=r*cos(angle) and y=r*sin(angle) ... you've got the opposite. >>> >>> You'd have to post more code for anyone to help with you in/out of class >>> problem ... >>> >>> Charles >>> >>> On Tue, Apr 28, 2015 at 6:52 AM, diliup gabadamudalige < >>> dili...@gmail.com> wrote: >>> >>>> Looking at the code on this page lines 47 & 48 >>>> >>>> >>>> http://programarcadegames.com/python_examples/show_file.php?file=sprite_circle_movement.py >>>> >>>> is there a way to do >>>> self.rect.x +*= some value* >>>> self.rect.y += some value >>>> >>>> rather than >>>> >>>> self.rect.x = self.radius * math.sin(self.angle) + self.center_x >>>> self.rect.y = self.radius * math.cos(self.angle) + self.center_y >>>> >>>> ? >>>> >>>> I tired it in the code attached and strangely it works ok but only >>>> OUTSIDE THE class. When I implement the exact code in a class it does >>>> something weird. I can't find where I have gone wrong. >>>> >>>> Please help. >>>> >>>> Many thanks in advance. >>>> >>>> Diliup Gabadamudalige >>>> >>>> >>>> >>>> ********************************************************************************************** >>>> This e-mail is confidential. It may also be legally privileged. If you >>>> are not the intended recipient or have received it in error, please delete >>>> it and all copies from your system and notify the sender immediately by >>>> return e-mail. Any unauthorized reading, reproducing, printing or further >>>> dissemination of this e-mail or its contents is strictly prohibited and may >>>> be unlawful. Internet communications cannot be guaranteed to be timely, >>>> secure, error or virus-free. The sender does not accept liability for any >>>> errors or omissions. >>>> >>>> ********************************************************************************************** >>>> >>>> >>> >> > > > -- > > Jeffrey Kleykamp >
