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<?
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class Tile {
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// The point (x,y) for this tile
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var $p;
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// The coord (lat,lon) for this tile
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var $co;
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// Zoom level for this tile
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var $z;
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// ...Constants...
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var $PI = 3.1415926535;
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var $tileSize = 256;
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var $pixelsPerLonDegree = Array();
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var $pixelsPerLonRadian = Array();
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var $numTiles = Array();
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var $bitmapOrigo = Array();
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// Note: These variable names are based on the variables names found in the
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// Google maps.*.js code.
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var $c = 256;
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var $bc;
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var $Wa;
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// Fill in the constants array
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function fillinconstants() {
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$this->bc = 2*$this->PI;
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$this->Wa = $this->PI/180;
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for($d = 17; $d >= 0; --$d) {
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$this->pixelsPerLonDegree[$d] = $this->c / 360;
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$this->pixelsPerLonRadian[$d] = $this->c / $this->bc;
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$e = $this->c / 2;
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$this->bitmapOrigo[$d] = new p($e,$e);
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$this->numTiles[$d] = $this->c / 256;
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$this->c *= 2;
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}
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}
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function Tile($latitude, $longitude, $zoomLevel) {
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$this->fillInConstants();
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$this->z = $zoomLevel;
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$this->p = $this->getTileCoordinate($latitude, $longitude, $zoomLevel);
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$this->co = $this->getLatLong($latitude, $longitude, $zoomLevel);
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}
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function getTileCoord() {
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return $this->p;
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}
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function getTileLatLong() {
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return $this->co;
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}
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function getKeyholeString() {
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$s = "";
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$myX = $this->p->x;
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$myY = $this->p->y;
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for($i = 17; $i > $this->z; $i--) {
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$rx = (fmod($myX, 2));
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$myX = floor($myX / 2);
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$ry = (fmod($myY, 2));
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$myY = floor($myY / 2);
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$s = $this->getKeyholeDirection($rx, $ry).$s;
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}
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return 't'.$s;
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}
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function getKeyholeDirection($x, $y) {
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if($x == 1) {
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if($y == 1) {
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return 's';
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} else if($y == 0) {
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return 'r';
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}
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} else if($x == 0) {
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if($y == 1) {
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return 't';
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} else if($y == 0) {
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return 'q';
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}
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}
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return '';
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}
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function getBitmapCoordinate($a, $b, $c) {
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$d = new p(0,0);
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$d->x = floor($this->bitmapOrigo[$c]->x + $b * $this->pixelsPerLonDegree[$c]);
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$e = sin($a * $this->Wa);
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if($e > 0.9999) {
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$e = 0.9999;
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}
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if($e < -0.9999) {
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$e = -0.9999;
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}
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$d->y = floor($this->bitmapOrigo[$c]->y + 0.5 * log((1 + $e) / (1 - $e)) * -1*($this->pixelsPerLonRadian[$c]));
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return $d;
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}
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function getTileCoordinate($a, $b, $c) {
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$d = $this->getBitmapCoordinate($a, $b, $c);
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$d->x = floor($d->x / $this->tileSize);
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$d->y = floor($d->y / $this->tileSize);
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return $d;
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}
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function getLatLong($a, $b, $c) {
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$d = new p(0, 0);
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$e = $this->getBitmapCoordinate($a, $b, $c);
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$a = $e->x;
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$b = $e->y;
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$d->x = ($a - $this->bitmapOrigo[$c]->x) / $this->pixelsPerLonDegree[$c];
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$e = ($b - $this->bitmapOrigo[$c]->y) / (-1*$this->pixelsPerLonRadian[$c]);
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$d->y = (2 * atan(exp($e)) - $this->PI / 2) / $this->Wa;
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return $d;
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}
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}
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// A simple PHP class that represents a point
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class p {
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var $x;
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var $y;
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function p($x,$y) {
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$this->x = $x;
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$this->y = $y;
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}
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}
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function getLatLongXYZ($x, $y, $zoom) {
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$lon = -180; // x
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$lonWidth = 360; // width 360
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$lat = -1;
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$latHeight = 2;
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$tilesAtThisZoom = 1 << (17 - $zoom);
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$lonWidth = 360.0 / $tilesAtThisZoom;
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$lon = -180 + ($x * $lonWidth);
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$latHeight = 2.0 / $tilesAtThisZoom;
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$lat = (($tilesAtThisZoom/2 - $y-1) * $latHeight);
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// convert lat and latHeight to degrees in a transverse mercator projection
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// note that in fact the coordinates go from about -85 to +85 not -90 to 90!
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$latHeight += $lat;
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$latHeight = (2 * atan(exp(PI() * $latHeight))) - (PI() / 2);
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$latHeight *= (180 / PI());
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$lat = (2 * atan(exp(PI() * $lat))) - (PI() / 2);
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$lat *= (180 / PI());
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$latHeight -= $lat;
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if ($lonWidth < 0) {
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$lon = $lon + $lonWidth;
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$lonWidth = -$lonWidth;
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}
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if ($latHeight < 0) {
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$lat = $lat + $latHeight;
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$latHeight = -$latHeight;
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}
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$rect = array();
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$rect[] = $lon;
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$rect[] = $lat;
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$rect[] = $latHeight;
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$rect[] = $lonWidth;
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return $rect;
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}
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function GetUrl($x, $y, $z) {
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$filename = "${z}/${x}/${y}.png";
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if (file_exists("./maps/".$filename)) {
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return "http://tracks.landais.org/maps/".$filename;
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}else{
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return "http://tracks.landais.org/maps/transparent.gif";
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}
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}
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