note 49813 added to function.imagefilledellipse

Here is a piece of code using imagefilledellipse which creates a simulation of the current phase of the moon... Usage is <img src="moon.php?size=100"> which produces an image 100px by 100px wide. If size is left out, the default is 24px by 24px. <?php $mps=2551442.8; // moon phase in seconds (29 days, 12 hours, 44 mins, 2.8 secs) $position=time()-mktime(10, 32, 0, 1, 25, 2005); // seconds since full moon at 10:32GMT on 25 Jan 2005 $position=($position-$mps*intval($position/$mps))/$mps; // phase from 0 to 1 $position=2*(0.5-$position); ## revised to produce easier to work with... ## $position=1 - full moon ## $position=0 - new moon ## $position=-1 - full moon $size=$_GET['size']; if (!is_numeric($size)) $size=24; // width/height in pixels $moon=imagecreate($size, $size); $dark=imagecolorallocate($moon, 0, 34, 68); // background colour for moon $light=imagecolorallocate($moon, 238, 238, 255); // foreground colour for moon $corona=imagecolorallocatealpha($moon, 153, 153, 153, 64); // edge of moon (semi-transparent) ## ## Make transparent background ## $background=imagecolorallocatealpha($moon, 0, 0, 0, 127); imagefill($moon, 0, 0, $background); ## ## Make the moon! ## imagefilledellipse($moon, round($size/2), round($size/2), $size, $size, $corona); if ($position>-1/$size AND $position<1/$size) imagefilledellipse($moon, round($size/2), round($size/2), $size-2, $size-2, $dark); // new moon elseif (abs($position)>1-1/$size) imagefilledellipse($moon, round($size/2), round($size/2), $size-2, $size-2, $light); // full moon elseif ($position>0) { imagefilledellipse($moon, round($size/2), round($size/2), $size-2, $size-2, $light); for ($i=0; $i<$size-2; $i++) { $xpos=($size-2)/2; $xpos=1-($i/$xpos); $xpos=sqrt(1-($xpos*$xpos)); $xpos=($size/2)+($position-0.5)*$xpos*($size-2); imagesetpixel($moon, round($xpos), $i+1, $dark); } for ($i=0; $i<$size; $i++) { $set=0; for ($j=0; $j<$size; $j++) { if (!$set AND imagecolorat($moon, $j, $i)==$dark) $set=1; elseif ($set AND imagecolorat($moon, $j, $i)==$light) imagesetpixel($moon, $j, $i, $dark); } } } else { imagefilledellipse($moon, round($size/2), round($size/2), $size-2, $size-2, $dark); for ($i=0; $i<$size-2; $i++) { $xpos=($size-2)/2; $xpos=1-($i/$xpos); $xpos=sqrt(1-($xpos*$xpos)); $xpos=($size/2)+($position+0.5)*$xpos*($size-2); imagesetpixel($moon, round($xpos), $i+1, $light); } for ($i=0; $i<$size; $i++) { $set=0; for ($j=0; $j<$size; $j++) { if (!$set AND imagecolorat($moon, $j, $i)==$light) $set=1; elseif ($set AND imagecolorat($moon, $j, $i)==$dark) imagesetpixel($moon, $j, $i, $light); } } } ## ## And output the picture ## header ("Content-Type: image/png"); imagepng($moon); imagedestroy($moon); ?> ---- Manual Page -- http://www.php.net/manual/en/function.imagefilledellipse.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+49813 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+49813&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+49813&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+49813&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+49813&report=yes&reason=useless Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+49813&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+49813&report=yes Search -- http://master.php.net/manage/user-notes.php