Re: cosine and sin in PHP on Win2K & IIS 5

Hi, That's correct, since PHP cos() and sin() uses radians and not degrees. This can be solved by first using deg2rad(). This would make your code look like this: <code> $i = deg2rad(270); print "cos:".cos($i); print "sine:".sin($i); </code> <display> cos:0 sin:-1 </display> /Johan Bradley J Bristow-Stagg wrote: > > Hey guys, > I am currently dabbling in a little graphics generation with gd_lib in PHP > on my Win2K box with IIS 5. Up until now I have had ZERO problems and am > really loving working with PHP. My problem then? Well I am rotating a > polygon around a point and PHP is not giving me correct values for cos() and > sine().. Some sample code and values follow: > > <code> > print "cos:".cos(270); > print "sine:".sine(270); > </code> > <display> > cos:0.9843819506325 > sin:-0.17604594647121 > </display> > > What's wrong with this picture? Well using my trusty scientific > calculator (from the ol' school days) I get: > cosine(270) = 0 > sine(270) = -1 > > Without getting correct values for the sine and cosine the rotation > equations do some really funky stuff =). So what do I do now? > > Regards > > Bradley J Bristow-Stagg > /------------------------------------------------------------------------\ > > \ "Luminous beings are we.. not this crude matter" - Yoda / > > / "The earth is but ONE country and Mankind it's citizens" - > Baha'u'llah \ > > \------------------------------------------------------------------------/ > > / www: http://www.staggmatrix.f2s.com | ICQ#: 8618833 \ > > \------------------------------------------------------------------------/ > > -- > PHP Windows Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-windows-unsubscribe@lists.php.net > For additional commands, e-mail: php-windows-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net