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

Hi, use arguments of trigonometric functions in radians, not degrees. Everything is ok in your example. Put as an argument for example pi/2... it will work. Greetings Piotr --- Bradley J Bristow-Stagg <bradley@stagghouse.f2s.com> 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 > ____________________________________________________________ Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie