Re: [pygame] Float precision
OsKaR wrote: If you try to move forward and left or right it would made a perfect circle isn't? Accumulation of errors will cause this to happen, even when there aren't any bugs, because you're moving in discrete steps. The error can be reduced by taking smaller steps. Or by using a more sophisticated numerical integration technique, although that's probably overkill for a tank game. -- Greg
Re: [pygame] Float precision
Python really should have a function for that. I looked around for one and couldn't find it. I usually define a function rndint() which essentially is int(round(num)), like Marcel's first method. That second method, Marcel, is interesting--I hadn't thought of it. Ian
Re: [pygame] Float precision
Hi. If you still have problens with precision, you may want to use round() before converting to integer: self.rect.centerx = int(round(self.xx)) self.rect.centery = int(round(self.yy)) or just (with same results): self.rect.centerx = int(self.xx + 0.5) self.rect.centery = int(self.yy + 0.5) Marcel 2008/7/4 OsKaR <[EMAIL PROTECTED]>: > Thanks John I will use this till I find a new solution > > 2008/7/4 John Leach <[EMAIL PROTECTED]>: > > Yes I see this. >> I think most of the problem is here >> self.rect.centerx += dx >>self.rect.centery += dy >> maybe centerx and centery need to be integers? >> I had better luck when I changed it to like this >>self.xx += dx >>self.yy += dy >>self.rect.centerx = int(self.xx) >>self.rect.centery = int(self.yy) >> where self.xx and self.yy are floats. >> It was still not perfect but much better than before. >> John >> >
Re: [pygame] Float precision
Thanks John I will use this till I find a new solution 2008/7/4 John Leach <[EMAIL PROTECTED]>: > Yes I see this. > I think most of the problem is here > self.rect.centerx += dx >self.rect.centery += dy > maybe centerx and centery need to be integers? > I had better luck when I changed it to like this >self.xx += dx >self.yy += dy >self.rect.centerx = int(self.xx) >self.rect.centery = int(self.yy) > where self.xx and self.yy are floats. > It was still not perfect but much better than before. > John > > > > > On Thu, 2008-07-03 at 19:36 +0200, OsKaR wrote: > > If you try to move forward and left or right it would made a perfect > > circle isn't? > > Well, if I do this the tank moves like a spring, it doesn't do a > > circle > > > > 2008/7/3 PyMike <[EMAIL PROTECTED]>: > > You forgot to include the images, but I made some mockups > > instead. I didn't see anything wrong with it though. Moved and > > rotated nice and smoothly. > > > > > > > > On Thu, Jul 3, 2008 at 11:52 AM, OsKaR > > <[EMAIL PROTECTED]> wrote: > > Ok It's upload on mediafire > > Here is the link: > > http://www.mediafire.com/?222n1oyn1my > > > > Sorry for the poor or inexistent documentation :( I'm > > working on it too > > > > > > 2008/7/3 PyMike <[EMAIL PROTECTED]>: > > > > > > Hello, > > > > If the game's not too big, can you upload it > > on mediafire.com or stuffr.net? I can try to > > fix it up :-) > > > > > > > > On Thu, Jul 3, 2008 at 11:12 AM, OsKaR > > <[EMAIL PROTECTED]> wrote: > > I've tried both things and it still > > working bad. I don't know what to do, > > any more ideas? > > > > 2008/7/3 Ian Mallett > > <[EMAIL PROTECTED]>: > > > > P.S., you may want to convert > > your angles to radians with > > math's handy radians() > > function. > > > > > > > > > > > > -- > > - pymike (http://pymike.pyedpypers.org/) > > > > > > > > > > -- > > - pymike (http://pymike.pyedpypers.org/) > > >
Re: [pygame] Float precision
Yes I see this. I think most of the problem is here self.rect.centerx += dx self.rect.centery += dy maybe centerx and centery need to be integers? I had better luck when I changed it to like this self.xx += dx self.yy += dy self.rect.centerx = int(self.xx) self.rect.centery = int(self.yy) where self.xx and self.yy are floats. It was still not perfect but much better than before. John On Thu, 2008-07-03 at 19:36 +0200, OsKaR wrote: > If you try to move forward and left or right it would made a perfect > circle isn't? > Well, if I do this the tank moves like a spring, it doesn't do a > circle > > 2008/7/3 PyMike <[EMAIL PROTECTED]>: > You forgot to include the images, but I made some mockups > instead. I didn't see anything wrong with it though. Moved and > rotated nice and smoothly. > > > > On Thu, Jul 3, 2008 at 11:52 AM, OsKaR > <[EMAIL PROTECTED]> wrote: > Ok It's upload on mediafire > Here is the link: > http://www.mediafire.com/?222n1oyn1my > > Sorry for the poor or inexistent documentation :( I'm > working on it too > > > 2008/7/3 PyMike <[EMAIL PROTECTED]>: > > > Hello, > > If the game's not too big, can you upload it > on mediafire.com or stuffr.net? I can try to > fix it up :-) > > > > On Thu, Jul 3, 2008 at 11:12 AM, OsKaR > <[EMAIL PROTECTED]> wrote: > I've tried both things and it still > working bad. I don't know what to do, > any more ideas? > > 2008/7/3 Ian Mallett > <[EMAIL PROTECTED]>: > > P.S., you may want to convert > your angles to radians with > math's handy radians() > function. > > > > > > -- > - pymike (http://pymike.pyedpypers.org/) > > > > > -- > - pymike (http://pymike.pyedpypers.org/) >
Re: [pygame] Float precision
If you try to move forward and left or right it would made a perfect circle isn't? Well, if I do this the tank moves like a spring, it doesn't do a circle 2008/7/3 PyMike <[EMAIL PROTECTED]>: > You forgot to include the images, but I made some mockups instead. I didn't > see anything wrong with it though. Moved and rotated nice and smoothly. > > > On Thu, Jul 3, 2008 at 11:52 AM, OsKaR <[EMAIL PROTECTED]> wrote: > >> Ok It's upload on mediafire >> Here is the link: http://www.mediafire.com/?222n1oyn1my >> >> Sorry for the poor or inexistent documentation :( I'm working on it too >> >> >> 2008/7/3 PyMike <[EMAIL PROTECTED]>: >> >> Hello, >>> >>> If the game's not too big, can you upload it on mediafire.com or >>> stuffr.net? I can try to fix it up :-) >>> >>> >>> On Thu, Jul 3, 2008 at 11:12 AM, OsKaR <[EMAIL PROTECTED]> wrote: >>> I've tried both things and it still working bad. I don't know what to do, any more ideas? 2008/7/3 Ian Mallett <[EMAIL PROTECTED]>: > P.S., you may want to convert your angles to radians with math's handy > radians() function. > >>> >>> >>> -- >>> - pymike (http://pymike.pyedpypers.org/) >> >> >> > > > -- > - pymike (http://pymike.pyedpypers.org/) >
Re: [pygame] Float precision
You forgot to include the images, but I made some mockups instead. I didn't see anything wrong with it though. Moved and rotated nice and smoothly. On Thu, Jul 3, 2008 at 11:52 AM, OsKaR <[EMAIL PROTECTED]> wrote: > Ok It's upload on mediafire > Here is the link: http://www.mediafire.com/?222n1oyn1my > > Sorry for the poor or inexistent documentation :( I'm working on it too > > > 2008/7/3 PyMike <[EMAIL PROTECTED]>: > > Hello, >> >> If the game's not too big, can you upload it on mediafire.com or >> stuffr.net? I can try to fix it up :-) >> >> >> On Thu, Jul 3, 2008 at 11:12 AM, OsKaR <[EMAIL PROTECTED]> wrote: >> >>> I've tried both things and it still working bad. I don't know what to do, >>> any more ideas? >>> >>> 2008/7/3 Ian Mallett <[EMAIL PROTECTED]>: >>> P.S., you may want to convert your angles to radians with math's handy radians() function. >>> >>> >> >> >> -- >> - pymike (http://pymike.pyedpypers.org/) > > > -- - pymike (http://pymike.pyedpypers.org/)
Re: [pygame] Float precision
Ok It's upload on mediafire Here is the link: http://www.mediafire.com/?222n1oyn1my Sorry for the poor or inexistent documentation :( I'm working on it too 2008/7/3 PyMike <[EMAIL PROTECTED]>: > Hello, > > If the game's not too big, can you upload it on mediafire.com or > stuffr.net? I can try to fix it up :-) > > > On Thu, Jul 3, 2008 at 11:12 AM, OsKaR <[EMAIL PROTECTED]> wrote: > >> I've tried both things and it still working bad. I don't know what to do, >> any more ideas? >> >> 2008/7/3 Ian Mallett <[EMAIL PROTECTED]>: >> >>> P.S., you may want to convert your angles to radians with math's handy >>> radians() function. >>> >> >> > > > -- > - pymike (http://pymike.pyedpypers.org/)
Re: [pygame] Float precision
Hello, If the game's not too big, can you upload it on mediafire.com or stuffr.net? I can try to fix it up :-) On Thu, Jul 3, 2008 at 11:12 AM, OsKaR <[EMAIL PROTECTED]> wrote: > I've tried both things and it still working bad. I don't know what to do, > any more ideas? > > 2008/7/3 Ian Mallett <[EMAIL PROTECTED]>: > >> P.S., you may want to convert your angles to radians with math's handy >> radians() function. >> > > -- - pymike (http://pymike.pyedpypers.org/)
Re: [pygame] Float precision
I've tried both things and it still working bad. I don't know what to do, any more ideas? 2008/7/3 Ian Mallett <[EMAIL PROTECTED]>: > P.S., you may want to convert your angles to radians with math's handy > radians() function. >
Re: [pygame] Float precision
P.S., you may want to convert your angles to radians with math's handy radians() function.
Re: [pygame] Float precision
Try reversing the sin and cos. Cosine resolves x direction and Sine resolves y. You have it backwards. Also, if you want to flip the screen coordinates, the y must be negative. You also might want to try working with the movements one at a time to isolate problems. Ian
