MapLibreMapLibre GL JS DocsExamplesOffset the vanishing point using padding

Offset the vanishing point using padding

Offset the center or vanishing point of the map to reduce distortion when floating elements are displayed over the map.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Offset the vanishing point using padding</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://unpkg.com/[email protected]/dist/maplibre-gl.js"></script>
<link href="https://unpkg.com/[email protected]/dist/maplibre-gl.css" rel="stylesheet" />
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
.rounded-rect {
background: white;
border-radius: 10px;
box-shadow: 0 0 50px -25px black;
}
.flex-center {
position: absolute;
display: flex;
justify-content: center;
align-items: center;
}
.flex-center.left {
left: 0px;
}
.flex-center.right {
right: 0px;
}
.sidebar-content {
position: absolute;
width: 95%;
height: 95%;
font-family: Arial, Helvetica, sans-serif;
font-size: 32px;
color: gray;
}
.sidebar-toggle {
position: absolute;
width: 1.3em;
height: 1.3em;
overflow: visible;
display: flex;
justify-content: center;
align-items: center;
}
.sidebar-toggle.left {
right: -1.5em;
}
.sidebar-toggle.right {
left: -1.5em;
}
.sidebar-toggle:hover {
color: #0aa1cf;
cursor: pointer;
}
.sidebar {
transition: transform 1s;
z-index: 1;
width: 300px;
height: 100%;
}
/*
The sidebar styling has them "expanded" by default, we use CSS transforms to push them offscreen
The toggleSidebar() function removes this class from the element in order to expand it.
*/
.left.collapsed {
transform: translateX(-295px);
}
.right.collapsed {
transform: translateX(295px);
}
</style>
<div id="map">
<div id="left" class="sidebar flex-center left collapsed">
<div class="sidebar-content rounded-rect flex-center">
Left Sidebar
<div
class="sidebar-toggle rounded-rect left"
onclick="toggleSidebar('left')"
>
&rarr;
</div>
</div>
</div>
<div id="right" class="sidebar flex-center right collapsed">
<div class="sidebar-content rounded-rect flex-center">
Right Sidebar
<div
class="sidebar-toggle rounded-rect right"
onclick="toggleSidebar('right')"
>
&larr;
</div>
</div>
</div>
</div>
<script>
var center = [-77.01866, 38.888];
var map = new maplibregl.Map({
container: 'map',
zoom: 12.5,
center: center,
pitch: 60,
style:
'https://api.maptiler.com/maps/streets/style.json?key=get_your_own_OpIi9ZULNHzrESv6T2vL'
});
new maplibregl.Marker().setLngLat(center).addTo(map);
function toggleSidebar(id) {
var elem = document.getElementById(id);
var classes = elem.className.split(' ');
var collapsed = classes.indexOf('collapsed') !== -1;
var padding = {};
if (collapsed) {
// Remove the 'collapsed' class from the class list of the element, this sets it back to the expanded state.
classes.splice(classes.indexOf('collapsed'), 1);
padding[id] = 300; // In px, matches the width of the sidebars set in .sidebar CSS class
map.easeTo({
padding: padding,
duration: 1000 // In ms, CSS transition duration property for the sidebar matches this value
});
} else {
padding[id] = 0;
// Add the 'collapsed' class to the class list of the element
classes.push('collapsed');
map.easeTo({
padding: padding,
duration: 1000
});
}
// Update the class list on the element
elem.className = classes.join(' ');
}
map.on('load', function () {
toggleSidebar('left');
});
</script>
</body>
</html>