Swush graf

Kode 

<?
class graph {
    public $height = '89';
    public $width = '160';
    private $values = array();
   
    private function average() {
        $array = $this->values;
        foreach ($array as $val) {
            $total = $total+$val;
        }
        $avg = $total/count($array);
    }
    private function addpunkt ($x, $y) {
        global $im, $red;
        imageline ($im, $x-1, $y, $x+1, $y, $red);
        imageline ($im, $x, $y-1, $x, $y+1, $red);
    }
    function addvalue ($val) {
        $this->values[] = $val;
    }   
    function show () {
        global $im, $red;
        header ("Content-type: image/png");
        $im = @imagecreatetruecolor($this->width, $this->height) or die("Cannot Initialize new GD image stream");
        $white = imagecolorallocate($im, 255, 255, 255);
        $black = imagecolorallocate($im, 0, 0, 0);
        $darkgray = imagecolorallocate($im, 200, 200, 200);
        $lightgray = imagecolorallocate($im, 220, 220, 220);
        $verylightgray = imagecolorallocate($im, 245, 245, 245);
        $red = imagecolorallocate($im, 255, 0, 0);
        imagefill($im, 0, 0, $white);
       
        imagestring($im, 1, 0, $this->height-7, "START", $black);
        imagestring($im, 1, $this->width-20, $this->height-7, "SLUT", $black);
       
        imageline($im, 5, 5, 5, $this->height-11, $darkgray);
        imageline($im, $this->width-10, 5, $this->width-10, $this->height-11, $darkgray);
        imageline($im, 5, 5, $this->width-10, 5, $darkgray);
        imageline($im, 5, $this->height-11, $this->width-10, $this->height-11, $darkgray);
       
       
        $stop = $this->width-11;
        for ($i = 18; $i<$stop; $i=$i+15) {
            imageline($im, $i, 6, $i, $this->height-12, $verylightgray);
        }   
       
           
        $stop = $this->height-11;
        $p=-1;
        for ($i = 10; $i<$stop; $i=$i+4) {
            if ($p == 1) {
                imageline($im, 6, $i, $this->width-11, $i, $lightgray);
                $p++;
            } else {
                imageline($im, 6, $i, $this->width-11, $i, $verylightgray);
                $p++;
                if ($p == 4) { $p = 1; }
            }
        }
       
        $verticalcenter = (($this->height-5-11)/2)+6;
        $this->addpunkt(10, $verticalcenter);
        $avg = $this->average;
        $horoffset = 10;
        foreach ($this->values as $val) {
            $percent = $avg/$val;
           
            $horoffset=$horoffset+5;
        }
       
        imagepng($im);
        imagedestroy($im);
    }
}
$g = new graph;
$g->addvalue(250);
$g->addvalue(850);
$g->show();
?>