Displaying Image from Function

Hi,

I’m having some trouble getting the image created by the following function to display correctly.

I’m pulling some data out of MySQL then plotting a barchart. However, I can only get the image stream to display, even if I wrap <img scr=” “> around it, and I don’t really want to generate a file. How can I call the function, and display the image correctly?

reports.php:

[CODE]if (isset($_POST[‘submit’])) {
$output=show_barchart_reports();
echo ‘<img src=”‘.$output.'”>’;
}[/CODE]

function.php

[CODE]function show_barchart_reports(){
$year = 2008;
$month= 12;
$numdays = cal_days_in_month(CAL_GREGORIAN, $month, $year) ;
for ( $i = 1; $i <= $numdays; $i++) {
$sql = “SELECT COUNT(id) FROM `support_requests` WHERE `date` LIKE ‘$year-$month-$i &#37;'”;
$result = mysql_query($sql) or die(‘Query failed: ‘ . mysql_error());
while($row=mysql_fetch_array($result)){
$data[$i] = $row[‘COUNT(id)’];
}
}

// create image
$width = 480;
$height = 350;
$image = imagecreate($width, $height);

// title
$titlefont = 3;

// colors
$white = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
$navy = imagecolorallocate($image, 0x00, 0x00, 0x80);
$black = imagecolorallocate($image, 0x00, 0x00, 0x00);
$gray = imagecolorallocate($image, 0xC0, 0xC0, 0xC0);

// layout
$maxval = max($data);
$nval = sizeof($data);

$vmargin = 20; // top (bottom) vertical margin for title (x-labels)
$hmargin = 38; // left horizontal margin for y-labels

$base = floor(($width – $hmargin) / $nval); // distance between columns

$ysize = $height – 2 * $vmargin; // y-size of plot
$xsize = $nval * $base; // x-size of plot

$txtsz = imagefontwidth($titlefont) * strlen($title); // pixel-width of title

$xpos = (int)($hmargin + ($xsize – $txtsz)/2); // center the title
$xpos = max(1, $xpos); // force positive coordinates
$ypos = 3; // distance from top

imagestring($image, $titlefont, $xpos, $ypos, $title , $black);

// y labels and grid lines
$labelfont = 2;
$ngrid = 4; // number of grid lines

$dydat = $maxval / $ngrid; // data units between grid lines
$dypix = $ysize / ($ngrid + 1); // pixels between grid lines

for ($i = 0; $i <= ($ngrid + 1); $i++) {
// iterate over y ticks

// height of grid line in units of data
$ydat = (int)($i * $dydat);

// height of grid line in pixels
$ypos = $vmargin + $ysize – (int)($i*$dypix);

$txtsz = imagefontwidth($labelfont) * strlen($ydat); // pixel-width of label
$txtht = imagefontheight($labelfont); // pixel-height of label

$xpos = (int)(($hmargin – $txtsz) / 2);
$xpos = max(1, $xpos);

imagestring($image, $labelfont, $xpos,
$ypos – (int)($txtht/2), $ydat, $black);

if (!($i == 0) && !($i > $ngrid)) {
imageline($image, $hmargin – 3,
$ypos, $hmargin + $xsize, $ypos, $gray);
// don’t draw at Y=0 and top
}
}

// columns and x labels
$padding = 3; // half of spacing between columns
$yscale = $ysize / (($ngrid+1) * $dydat); // pixels per data unit

for ($i = 0; list($xval, $yval) = each($data); $i++) {

// vertical columns
$ymax = $vmargin + $ysize;
$ymin = $ymax – (int)($yval*$yscale);
$xmax = $hmargin + ($i+1)*$base – $padding;
$xmin = $hmargin + $i*$base + $padding;

imagefilledrectangle($image, $xmin, $ymin, $xmax, $ymax, $navy);

// x labels
$txtsz = imagefontwidth($labelfont) * strlen($xval);

$xpos = $xmin + (int)(($base – $txtsz) / 2);
$xpos = max($xmin, $xpos);
$ypos = $ymax + 3; // distance from x axis

imagestring($image, $labelfont, $xpos, $ypos, $xval, $black);
}

// plot frame
imagerectangle($image, $hmargin, $vmargin,
$hmargin + $xsize, $vmargin + $ysize, $black);

// flush image
header(‘Content-type: image/gif’); // or “Content-type: image/png”
imagegif($image); // or imagepng($image)
imagedestroy($image);
}[/CODE]

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