private function prime($x, $y) {
        $x = round($x);
        $y = round($y);
        $px = floor($x / 2);
        $py = floor($y / 4);

        if (!isset($this->chars[$py][$px])) {
            $this->chars[$py][$px] = 0;
        }

        return [$x, $y, $px, $py, $this->chars[$py][$px]];
    }
private function prime($x, $y) {
        $x = round($x);
        $y = round($y);
        $px = floor($x / 2);
        $py = floor($y / 4);

        if (!isset($this->chars[$py][$px])) {
            $this->chars[$py][$px] = 0;
        }

        return [$x, $y, $px, $py, $this->chars[$py][$px]];
    }
private function prime ( $ x , $ y ) { $ x = round ( $ x ) ; $ y = round ( $ y ) ; $ px = floor ( $ x / 2 ) ; $ py = floor ( $ y / 4 ) ; if ( ! isset ( $ this -> chars [ $ py ] [ $ px ] ) ) { $ this -> chars [ $ py ] [ $ px ] = 0 ; } return [ $ x , $ y , $ px , $ py , $ this -> chars [ $ py ] [ $ px ] ] ; }
Autovivification for a canvas position.

@param integer $x x position
@param integer $y y position

@return array
Autovivification for a canvas position .