} else {
set_time_limit(0);
$imgWidth = G_TILE_SIZE;
$imgHeight = G_TILE_SIZE;
$image = imagecreate($imgWidth, $imgHeight);
// Allocate the color map
InterpolateRGB($colorScale, RGB(0, 0, 110), RGB(0, 0, 110), 0, 255);
InterpolateRGB($colorScale, RGB(0, 100, 0), RGB(180, 180, 50), 1, 60);
InterpolateRGB($colorScale, RGB(180, 180, 50), RGB(150, 110, 50), 60, 100);
InterpolateRGB($colorScale, RGB(150, 110, 50), RGB(150, 150, 150), 100, 150);
InterpolateRGB($colorScale, RGB(150, 150, 150), RGB(255, 255, 255), 150, 200);
InterpolateRGB($colorScale, RGB(255, 255, 255), RGB(255, 255, 255), 200, 253);
InterpolateRGB($colorScale, RGB(0, 0, 0), RGB(0, 0, 0), 254, 255);
AllocateColorMap($image, $colorScale, $cMap);
MakeTile($image, $x, $y, $z);
$cache->set(PngToString($image), $id);
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
}
} else {
header('Content-type: text/plain');
echo 'Invalid URL';
}
// Tile handling
function MakeTile($image, $x, $y, $zoom)
{
$proj = new Mercator($zoom, G_TILE_SIZE);
$lonL = $proj->Lon($x * G_TILE_SIZE);
$lonR = $proj->Lon(($x + 1) * G_TILE_SIZE);
$lonBound[0] = $lonL;
private function makeTile()
{
set_time_limit(0);
$dstImg = imagecreatetruecolor(256, 256);
$lats[0] = $latB = $this->proj->Lat($this->y + 1);
$latT = $this->proj->Lat($this->y);
foreach ($this->latLimits as $lat) {
if ($lat > $latB && $lat < $latT) {
$lats[] = $lat;
}
}
$lats[] = $latT;
$lons[0] = $lonL = $this->proj->Lon($this->x);
$lonR = $this->proj->Lon($this->x + 1);
foreach ($this->lonLimits as $lon) {
if ($lon > $lonL && $lon < $lonR) {
$lons[] = $lon;
}
}
$lons[] = $lonR;
for ($x = 0; $x < count($lons) - 1; $x++) {
for ($y = 0; $y < count($lats) - 1; $y++) {
$this->makeBlock($dstImg, $lats, $y, $lons, $x);
}
}
return PngToString($dstImg);
}