Hi Sean: do you have a program that demonstrates this error that you can share? That'll let me track down the bug.
Hi Danny: The contracts are checked at the boundary based on the define/chk macro. This is an internal error somewhere -- angles are not restricted to being between 0 and 360. I don't suppose you noticed how to make this error happen? Robby On Monday, May 12, 2014, Danny Yoo <d...@hashcollision.org> wrote: > On Mon, May 12, 2014 at 4:11 PM, Sean Kanaley <skana...@gmail.com> wrote: > > Hello all, > > > > I can't figure this out as I have no function called degrees->complex > and it > > occurs only sometimes. It's always when rotating stuff through the > positive > > x axis, as in it's probably related to floating point operations like > sin or > > cos near 0 or perhaps integer multiples of 2pi. So far I believe it has > > only happened rotating clockwise where the error freezes the program with > > slightly negative radians displaying (part of my debug output). > > > > It's possible it's my own bug with a bad sqrt or using NaN or something, > but > > then what does the message mean? > > > You're trying to rotate, but the degrees have to be between 0 and 360 > degrees. > > > http://docs.racket-lang.org/teachpack/2htdpimage.html#%28def._%28%28lib._2htdp%2Fimage..rkt%29._rotate%29%29 > > Double check your calls to (rotate) and see that the angle is within > those bounds. > > --- > > Internal comment: The error message appears to arise deep within > htdp-lib/2htdp/private/image-more.rkt. Unfortunately, the contract > check appears to be done at the private implementation end of things, > rather than at the public function boundary, so the original > questioner is not seeing as helpful of an error message as would be > ideal... Actually, the contract might be wrong. It says that it has > to be an angle: > > > http://docs.racket-lang.org/teachpack/2htdpimage.html#%28def._%28%28lib._2htdp%2Fimage..rkt%29._angle~3f%29%29 > > but angles aren't restricted to 0-360, even though the internal > implementation really needs it to be within those bounds, according > to: > > > http://git.racket-lang.org/plt/blob/HEAD:/pkgs/htdp-pkgs/htdp-lib/2htdp/private/image-more.rkt#l794 > ____________________ > Racket Users list: > http://lists.racket-lang.org/users >
____________________ Racket Users list: http://lists.racket-lang.org/users
