note 70986 added to function.imageline

Here's a function to plot a line on a polar coordinate system: <?php function imagepolarline($image,$x1,$y1,$length,$angle,$color) { $x2 = $x1 + sin( deg2rad($angle+90) ) * $length; $y2 = $y1 + cos( deg2rad($angle+90) ) * $length; imageline($image,$x1,$y1,$x2,$y2,$color); } ?> x1,y1 are the coordinates for the central point. If you want the orientation to be like a compass i.e. 90 degrees = East, 180 = South etc, then use the following: $x2 = $x1 + cos( deg2rad($angle-90)) * $length; $y2 = $y1 + sin( deg2rad($angle-90)) * $length; ---- Server IP: 203.16.234.91 Probable Submitter: 59.100.3.105 ---- Manual Page -- http://www.php.net/manual/en/function.imageline.php Edit -- https://master.php.net/note/edit/70986 Del: integrated -- https://master.php.net/note/delete/70986/integrated Del: useless -- https://master.php.net/note/delete/70986/useless Del: bad code -- https://master.php.net/note/delete/70986/bad+code Del: spam -- https://master.php.net/note/delete/70986/spam Del: non-english -- https://master.php.net/note/delete/70986/non-english Del: in docs -- https://master.php.net/note/delete/70986/in+docs Del: other reasons-- https://master.php.net/note/delete/70986 Reject -- https://master.php.net/note/reject/70986 Search -- https://master.php.net/manage/user-notes.php