"; $cntrX = $width / 2; $cntrY = $height / 2; echo "
The center of the image is at " .$cntrX . ", " . $cntrY ; echo '
Test Trig Fucntions php
Get all cordinates for a circle
'; $r = 5 ; echo 'Radiuz == ' . $r . '
X, Y, PixelColour at that point.

'; $im = imagecreatefromjpeg("spc.jpg"); $Pi = pi(); for ($a=0; $a<=360; $a++) { $ax = $r*cos($a*$Pi/180) ; //x $ay = $r*sin($a*$Pi/180) ; //y $PXCol = imagecolorat($im, $ax, $ay); echo $ax . ", " . $ay . ", " . $PXCol . "
"; } ?>