private function setShadowColor($color, $alpha, $type)
    {
        if ($color !== null) {
            $this->shadowProperties['color']['value'] = (string) $color;
        }
        if ($alpha !== null) {
            $this->shadowProperties['color']['alpha'] = $this->getTrueAlpha((int) $alpha);
        }
        if ($type !== null) {
            $this->shadowProperties['color']['type'] = (string) $type;
        }

        return $this;
    }
private function setShadowColor($color, $alpha, $type)
    {
        if ($color !== null) {
            $this->shadowProperties['color']['value'] = (string) $color;
        }
        if ($alpha !== null) {
            $this->shadowProperties['color']['alpha'] = $this->getTrueAlpha((int) $alpha);
        }
        if ($type !== null) {
            $this->shadowProperties['color']['type'] = (string) $type;
        }

        return $this;
    }
private function setShadowColor ( $ color , $ alpha , $ type ) { if ( $ color !== null ) { $ this -> shadowProperties [ 'color' ] [ 'value' ] = ( string ) $ color ; } if ( $ alpha !== null ) { $ this -> shadowProperties [ 'color' ] [ 'alpha' ] = $ this -> getTrueAlpha ( ( int ) $ alpha ) ; } if ( $ type !== null ) { $ this -> shadowProperties [ 'color' ] [ 'type' ] = ( string ) $ type ; } return $ this ; }
Set Shadow Color.

@param string $color
@param int $alpha
@param string $type

@return GridLines
Set Shadow Color .