nice, thanks... didnt see it this way 2008/10/15 Peli <[EMAIL PROTECTED]>
> > int x; // pixel position > int xscaled = 0; // pixel position scaled by 1000 > ... > int movement=BULLETSPEED*deltaT; /// v*t = d // don't divide by > 1000 here > > xscaled += movement; // calculate movement more accurately > x = xscaled / 1000; // scale down only when you want to plot > draw(x); > > If you scale by 1024, you can also write > x = xscaled >> 10; // divide by 1024. Could be faster than integer > division. > > Peli > www.openintents.org > > On Oct 15, 11:55 am, TjerkW <[EMAIL PROTECTED]> wrote: > > On 15 okt, 00:48, hackbod <[EMAIL PROTECTED]> wrote: > > > > > The emulator in no way tries to emulate the performance > > > characteristics of real hardware. > > > > > For this and many other reasons, every developer should run their > > > application on real hardware before considering it to be ready for for > > > release to the public. > > > > I do not have to money to buy a android phone. > > I thought the emulator emulates a real phone, too bad. > > > > > Re: > > > > > > I thought about decoupling the movement from the framerate (speed = > > > > pixels/second), but this > > > > requires the use for floats, which make the calculation rather slow. > > > > > In a game you should never tie the speed of movement to the frame > > > rate, because that will of course vary across different hardware. > > > Even if we were doing a "google phone" and completely controlling the > > > hardware, we'd want to release new hardware in the future that goes > > > faster, and your game then wouldn't work well with it. > > > > I understand that. > > > > > Also there should be no reason to need floats to deal with this, you > > > can use fixed point integers. > > > > How should i do it. > > > > Supposei have the following: > > int BULLET_SPEED=30; // 30 pixels/second > > > > // then on a frameDraw > > long deltaT=thread.getFrameTime(); // the time it took to move to a > > new frame, in millis > > int movement=(BULLETSPEED*deltaT)/1000; /// v*t = d > > > > The problem here is that movement is always zero because the devision > > is done with 1000 (1 second). > > So either i use this: > > > > int movement=(int)((BULLETSPEED*deltaT)/(float)1000); > > > > Which required FLOATING POINT calculation. > > > > Or i make the bullet speed a float. But this also requires floating > > point calculation. > > > > So how is it done, without the need of floating points? > > > -- -- Tjerk Wolterink @ GMail --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
