Use cos(270/360*2*pi()) instead of cos(270).
-----Original Message-----
From: Bradley J Bristow-Stagg [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, June 19, 2001 1:16 PM
To: [EMAIL PROTECTED]
Subject: [PHP-WIN] cosine and sin in PHP on Win2K & IIS 5
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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