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#1 2012-10-27 12:09:12
- Maxmanrules1
- New Scratcher
- Registered: 2012-10-27
- Posts: 1
Rounding Error in Variables
In a program I made, I used variables to represent the x and y coordinates of some sprite, for example, when x = 1 and y = 2, go to (60, 120). When you press the arrow keys, these values will change by Integers and so will the sprite's x and y position. For some reason, however, doing this would sometimes result in situations like x = 3.846298569837 x 10^(-16) which is very very close to 0, but it still threw my program off quite a bit. I fixed it with a rounding script, but I'm still not sure whether this is my error or Scratch's.
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#2 2012-10-27 15:20:55
- scimonster
- Community Moderator
- Registered: 2010-06-13
- Posts: 1000+
Re: Rounding Error in Variables
Could you give us a link to the project so we can see what's going on here?
Moderator | Scratch Wiki Administrator | Coders' Shed AdministratorScratch 2.0 is just around the corner! Prepare for the transition by beta testing. Your feedback will help make it the best it can be!
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#3 2012-10-28 07:31:59
- joefarebrother
- Scratcher
- Registered: 2011-04-08
- Posts: 1000+
Re: Rounding Error in Variables
It happens because scratch pixels don't exactly overlap with screen pixels, so x and y positions adjust themselves automatically to pixels they can display themselves on. It only happens with x and y not other variables and usually the difference is too small to matter, and when it is, you can just use round.
My latest project is called
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