Function to get 5-sided polygon (pentagon) or star (pentagram) co-ords. <?phpfunction _makeFiveSidedStar( $x, $y, $radius, $shape='polygon', $spiky=NULL ) { $point = array() ; // new array $angle = 360 / 5 ; $point[0]['x'] = $x ; $point[0]['y'] = $y - $radius ; $point[2]['x'] = $x + ( $radius * cos( deg2rad( 90 - $angle ) ) ) ; $point[2]['y'] = $y - ( $radius * sin( deg2rad( 90 - $angle ) ) ) ; $point[4]['x'] = $x + ( $radius * sin( deg2rad( 180 - ( $angle*2 ) ) ) ) ; $point[4]['y'] = $y + ( $radius * cos( deg2rad( 180 - ( $angle*2 ) ) ) ) ; $point[6]['x'] = $x - ( $radius * sin( deg2rad( 180 - ( $angle*2 ) ) ) ) ; $point[6]['y'] = $y + ( $radius * cos( deg2rad( 180 - ( $angle*2 ) ) ) ) ; $point[8]['x'] = $x - ( $radius * cos( deg2rad( 90 - $angle ) ) ) ; $point[8]['y'] = $y - ( $radius * sin( deg2rad( 90 - $angle ) ) ) ; if( $shape == 'star' ) { if( $spiky == NULL ) $spiky = 0.5 ; // degree of spikiness, default to 0.5 $indent = $radius * $spiky ; $point[1]['x'] = $x + ( $indent * cos( deg2rad( 90 - $angle/2 ) ) ) ; $point[1]['y'] = $y - ( $indent * sin( deg2rad( 90 - $angle/2 ) ) ) ; $point[3]['x'] = $x + ( $indent * sin( deg2rad( 180 - $angle ) ) ) ; $point[3]['y'] = $y - ( $indent * cos( deg2rad( 180 - $angle ) ) ) ; $point[5]['x'] = $x ; $point[5]['y'] = $y + ( $indent * sin( deg2rad( 180 - $angle ) ) ) ; $point[7]['x'] = $x - ( $indent * sin( deg2rad( 180 - $angle ) ) ) ; $point[7]['y'] = $y - ( $indent * cos( deg2rad( 180 - $angle ) ) ) ; $point[9]['x'] = $x - ( $indent * cos( deg2rad( 90 - $angle/2 ) ) ) ; $point[9]['y'] = $y - ( $indent * sin( deg2rad( 90 - $angle/2 ) ) ) ; } ksort( $point ) ; $coords = array() ; // new array foreach( $point as $pKey=>$pVal ) { if( is_array( $pVal ) ) { foreach( $pVal as $pSubKey=>$pSubVal ) { if( !empty( $pSubVal ) ) array_push( $coords, $pSubVal ) ; } } } return $coords ;}$values = _makeFiveSidedStar( 100, 100, 50, 'star' ) ;?>