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
<[EMAIL PROTECTED]> 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
>
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