<?php
error_reporting(E_ALL);
$h = array();
for ($i=0;$i<24;$i++)
{
    $h[$i] = rand(0,1000);
}


$w=550;
$h=350;
//DEFINE('MARGIN_LEFT',20);
//DEFINE('MARGIN_TOP',5);
//DEFINE('MARGIN_RIGHT',6);
//DEFINE('MARGIN_BOTTOM',30);
DEFINE('MARGIN_LEFT',100);
DEFINE('MARGIN_TOP',100);
DEFINE('MARGIN_RIGHT',100);
DEFINE('MARGIN_BOTTOM',100);
$l = MARGIN_LEFT;
$r = $w - MARGIN_RIGHT;
$t = MARGIN_TOP;
$b = $h - MARGIN_BOTTOM;
// setup
$image = imagecreatetruecolor($w,$h);
imagealphablending($image, true);
// Allocate some colors
$clr_bg =  imagecolorallocate($image, 0xdd, 0xdd, 0xdd);
$clr_black    = imagecolorallocate($image, 0x00, 0x00, 0x00);
$clr_gray    = imagecolorallocatealpha($image, 0xaa, 0xaa, 0xaa,0x10);
$clr_blue    = imagecolorallocate($image, 0x49, 0xbd, 0xd6);
$clr_sky    = imagecolorallocate($image, 0x2e, 0x69, 0xd6);
// font
$font = 'OpenSansCondensed-Light.ttf';
$font_size = 12;
// fill bg
imagefilledrectangle($image,0,0,$w,$h,$clr_bg);

// 25% lines + text
for ($i=0;$i<5;$i++)
{
    $y = $t + ($b-$t)/4*$i;
    imageline($image,$l,$y,$r,$y,$clr_gray);
    $txt = sprintf('%d%%',(4-$i)*25);

    $text_size = imagettftext ( $image , $font_size , 0 ,0 , 0 , $clr_black , $font ,$txt );
    $tx = $l - $text_size[4]-3;
    $ty = $y - $text_size[5]/2;
    imagettftext($image,$font_size,0,$tx,$ty, $clr_black, $font, $txt);
}


// chart outline
imagerectangle($image, $l, $t, $r, $b, $clr_black);
/*
// hour nums
$rct_w =$w-MARGIN_LEFT-MARGIN_RIGHT;
$rct_w_24 = $rct_w/24;
for ($i=0;$i<24;$i++)
{
$txt = sprintf('%d',$i);

$text_size = imagettftext ( $image , $font_size , 0 ,0 , 0 , $clr_black , $font ,$txt );
$tx = MARGIN_LEFT + $rct_w_24*$i + ($rct_w_24-$text_size[4])/2;
$ty = $h-MARGIN_BOTTOM+5-$text_size[5];
imagettftext($image,$font_size,0,$tx,$ty, $clr_black, $font, $txt);

imagefilledrectangle($image,
MARGIN_LEFT+$rct_w_24*$i+1,$h-MARGIN_BOTTOM-($h[$i]),
MARGIN_LEFT+$rct_w_24*($i+1)-1,$h-MARGIN_BOTTOM,
$clr_blue);
//imagerectangle($image, MARGIN_LEFT, MARGIN_TOP, $w-MARGIN_RIGHT, $h-MARGIN_BOTTOM, $clr_black);
}

*/
// Flush the image
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);

?>