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inline.html
executable file
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/
inline.html
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<!DOCTYPE html>
<html>
<head>
<title>Showing Pixel and Tile Coordinates</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<style type="text/css">
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html,
body {
height: 100%;
margin: 0;
padding: 0;
}
</style>
<script>
function initMap() {
const chicago = new google.maps.LatLng(41.85, -87.65);
const map = new google.maps.Map(document.getElementById("map"), {
center: chicago,
zoom: 3,
});
const coordInfoWindow = new google.maps.InfoWindow();
coordInfoWindow.setContent(
createInfoWindowContent(chicago, map.getZoom())
);
coordInfoWindow.setPosition(chicago);
coordInfoWindow.open(map);
map.addListener("zoom_changed", () => {
coordInfoWindow.setContent(
createInfoWindowContent(chicago, map.getZoom())
);
coordInfoWindow.open(map);
});
}
const TILE_SIZE = 256;
function createInfoWindowContent(latLng, zoom) {
const scale = 1 << zoom;
const worldCoordinate = project(latLng);
const pixelCoordinate = new google.maps.Point(
Math.floor(worldCoordinate.x * scale),
Math.floor(worldCoordinate.y * scale)
);
const tileCoordinate = new google.maps.Point(
Math.floor((worldCoordinate.x * scale) / TILE_SIZE),
Math.floor((worldCoordinate.y * scale) / TILE_SIZE)
);
return [
"Chicago, IL",
"LatLng: " + latLng,
"Zoom level: " + zoom,
"World Coordinate: " + worldCoordinate,
"Pixel Coordinate: " + pixelCoordinate,
"Tile Coordinate: " + tileCoordinate,
].join("<br>");
}
// The mapping between latitude, longitude and pixels is defined by the web
// mercator projection.
function project(latLng) {
let siny = Math.sin((latLng.lat() * Math.PI) / 180);
// Truncating to 0.9999 effectively limits latitude to 89.189. This is
// about a third of a tile past the edge of the world tile.
siny = Math.min(Math.max(siny, -0.9999), 0.9999);
return new google.maps.Point(
TILE_SIZE * (0.5 + latLng.lng() / 360),
TILE_SIZE * (0.5 - Math.log((1 + siny) / (1 - siny)) / (4 * Math.PI))
);
}
</script>
</head>
<body>
<div id="map"></div>
<!-- Async script executes immediately and must be after any DOM elements used in callback. -->
<script
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
async
></script>
</body>
</html>