robots.txt added
[contractdashboard.git] / displayHeatmap.php
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<?php
 
include('lib/common.inc.php');
 
$year = 2006;
$ZeroX = 112.5;
$MaxX = 157;
$ZeroY = -9;
$MaxY = -45;
 
$XRange = $MaxX - $ZeroX;
$YRange = abs($MaxY) - abs($ZeroY);
$xdivs = 250;
$xdivlength = $XRange / $xdivs;
$ydivs = 250;
$ydivheight = $YRange / $ydivs;
 
$borderLeft = 100;
$borderTop = 35;
$width = 497;
$height = 457;
//echo "http://dev.openstreetmap.org/~pafciu17/?module=map&bbox=".$ZeroX.",".$ZeroY.",".$MaxX.",".$MaxY."&width=".$width."&height=".$height;
//$handle = ImageCreate ($width, $height) or die ("Cannot Create image");
$handle = imagecreatefrompng('images/australia.png');
$white = imagecolorallocate($handle, 0, 0, 0);
imagecolortransparent($handle, $white);
 
$query = 'SELECT "supplierPostcode", sum("value") as value, max(lat) as lat, max(lon) as lon FROM contractnotice inner join postcodes on "supplierPostcode" = postcode::text where "childCN" is null AND "supplierCountry" = \'Australia\' GROUP BY "supplierPostcode"';
$query = $conn->prepare($query);
$query->execute();
databaseError($conn->errorInfo());
 
 
$left = "FFFF50";
$right = "EF0050";
$leftR = hexdec(substr($left, 0, 2));
$leftG = hexdec(substr($left, 2, 2));
$leftB = hexdec(substr($left, 4, 2));
$rightR = hexdec(substr($right, 0, 2));
$rightG = hexdec(substr($right, 2, 2));
$rightB = hexdec(substr($right, 4, 2));
for ($i = 0; $i < 250; $i++) {
    $colorset[$i] = imagecolorallocatealpha($handle, $leftR + ($i * (($rightR - $leftR) / 250)), $leftG + ($i * (($rightG - $leftG) / 250)), $leftB + ($i * (($rightB - $leftB) / 250)), 117 - ($i / 250) * 40);
}
 
foreach ($query->fetchAll() as $row) {
    $xpage = round((($XRange - ($MaxX - $row['lon'])) / $xdivlength));
    if ($row['lat'] < -40.25)
        $row['lat']-= 0.75;
    $ypage = round(($YRange - (abs($MaxY) - abs($row['lat']))) / $ydivheight);
    @$pagevalues[$xpage][$ypage] += $row['value'];
    //echo $ypage." ".$xpage."<br>";
}
 
$max = 0;
$min = 0;
for ($i = 0; $i < $xdivs; $i++) {
    for ($j = 0; $j < $ydivs; $j++) {
        if (@$pagevalues[$i][$j]) {
            if (@$pagevalues[$i][$j] > $max)
                $max = @$pagevalues[$i][$j];
            if ($min == 0 || @$pagevalues[$i][$j] < $min)
                $min = @$pagevalues[$i][$j];
        } else {
            @$pagevalues[$i][$j] = ((@$pagevalues[$i][$j] + (@$pagevalues[$i + 1][$j] + @$pagevalues[$i][$j + 1]
                    + @$pagevalues[$i - 1][$j] + @$pagevalues[$i][$j - 1]) / 4) / 2) - 9;
            @$pagevalues[$i - 1][$j] = ((@$pagevalues[$i - 1][$j] + (@$pagevalues[$i][$j] + @$pagevalues[$i - 1][$j + 1]
                    + @$pagevalues[$i - 2][$j] + @$pagevalues[$i - 1][$j - 1]) / 4) / 2) - 9;
            @$pagevalues[$i][$j - 1] = ((@$pagevalues[$i][$j - 1] + (@$pagevalues[$i + 1][$j - 1] + @$pagevalues[$i][$j]
                    + @$pagevalues[$i - 1][$j - 1] + @$pagevalues[$i][$j - 2]) / 4) / 2) - 9;
        }
    }
}
//echo $max." ".$min;
//echo "<table width='100%'>";
for ($i = 0; $i < $xdivs; $i++) {
//   echo "<tr>";
    for ($j = 0; $j < $ydivs; $j++) {
//   echo ("<td>". log10(@$pagevalues[$i][$j])/log10($max) ."</td>");
        if ((@$pagevalues[$i][$j]) > $min) {
            $x = $i * ($width / $xdivs);
            $x1 = $borderLeft + $x - ($width / $xdivs);
            $x2 = $borderLeft + $x + ($width / $xdivs);
            $y = $j * ($height / $ydivs);
            $y1 = $borderTop + $y - ($height / $ydivs);
            $y2 = $borderTop + $y + ($height / $ydivs);
            imagefilledrectangle($handle, $x1, $y1, $x2, $y2, $colorset[(int) ((log10(@$pagevalues[$i][$j]) / log10($max)) * 249)]);
        }
    }
//echo "</tr>";
}
//echo "</table>"
 
header("Content-type: image/png");
ImagePng($handle);
?>