Animate camera¶
Customize camera animations using AnimationOptions
Example¶
<!DOCTYPE html>
<html lang="en">
<head>
<title>Customize camera animations</title>
<meta property="og:description" content="Customize camera animations using AnimationOptions." />
<meta charset='utf-8'>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src='https://unpkg.com/@vietmap/vietmap-gl-js@4.2.0/vietmap-gl.js'></script>
<link rel='stylesheet' href='https://unpkg.com/@vietmap/vietmap-gl-js@4.2.0/vietmap-gl.css' />
<style>
body { margin: 0; padding: 0; }
html, body, #map { height: 100%; }
</style>
</head>
<body>
<style>
.map-overlay {
font: 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
position: absolute;
width: 200px;
top: 0;
left: 0;
padding: 10px;
}
.map-overlay .map-overlay-inner {
background-color: #fff;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
border-radius: 3px;
padding: 10px;
margin-bottom: 10px;
}
.map-overlay-inner fieldset {
border: none;
padding: 0;
margin: 0 0 10px;
}
.map-overlay-inner fieldset:last-child {
margin: 0;
}
.map-overlay-inner select {
width: 100%;
}
.map-overlay-inner p {
margin: 0;
}
.map-overlay-inner label {
display: block;
font-weight: bold;
}
.map-overlay-inner button {
background-color: cornflowerblue;
color: white;
border-radius: 5px;
display: inline-block;
height: 20px;
border: none;
cursor: pointer;
}
.map-overlay-inner button:focus {
outline: none;
}
.map-overlay-inner button:hover {
background-color: blue;
box-shadow: inset 0 0 0 3px rgba(0, 0, 0, 0.1);
-webkit-transition: background-color 500ms linear;
-ms-transition: background-color 500ms linear;
transition: background-color 500ms linear;
}
.offset > label,
.offset > input {
display: inline;
}
#animateLabel {
display: inline-block;
min-width: 20px;
}
</style>
<div id="map"></div>
<div class="map-overlay top">
<div class="map-overlay-inner">
<fieldset>
<label for="easing">Select easing function</label>
<select id="easing" name="easing">
<option value="easeInCubic">Ease In Cubic</option>
<option value="easeOutQuint">Ease Out Quint</option>
<option value="easeInOutCirc">Ease In/Out Circ</option>
<option value="easeOutBounce">Ease Out Bounce</option>
</select>
</fieldset>
<fieldset>
<label for="duration">Set animation duration</label>
<p id="durationValue"></p>
<input
type="range"
id="duration"
name="duration"
min="0"
max="10000"
step="500"
value="1000"
/>
</fieldset>
<fieldset>
<label>Animate camera motion</label>
<label for="animate" id="animateLabel">Yes</label>
<input type="checkbox" id="animate" name="animate" checked />
</fieldset>
<fieldset class="offset">
<label for="offset-x">Offset-X</label>
<input
type="number"
id="offset-x"
name="offset-x"
min="-200"
max="200"
step="50"
value="0"
/>
</fieldset>
<fieldset class="offset">
<label for="offset-y">Offset-Y</label>
<input
type="number"
id="offset-y"
name="offset-y"
min="-200"
max="200"
step="50"
value="0"
/>
<p>Offsets can be negative</p>
</fieldset>
<button type="button" id="animateButton" name="test-animation">
Test Animation
</button>
</div>
</div>
<script>
// declare various easing functions.
// easing functions mathematically describe
// how fast a value changes during an animation.
// each function takes a parameter t that represents
// the progress of the animation.
// t is in a range of 0 to 1 where 0 is the initial
// state and 1 is the completed state.
const easingFunctions = {
// start slow and gradually increase speed
easeInCubic (t) {
return t * t * t;
},
// start fast with a long, slow wind-down
easeOutQuint (t) {
return 1 - Math.pow(1 - t, 5);
},
// slow start and finish with fast middle
easeInOutCirc (t) {
return t < 0.5 ?
(1 - Math.sqrt(1 - Math.pow(2 * t, 2))) / 2 :
(Math.sqrt(1 - Math.pow(-2 * t + 2, 2)) + 1) / 2;
},
// fast start with a "bounce" at the end
easeOutBounce (t) {
const n1 = 7.5625;
const d1 = 2.75;
if (t < 1 / d1) {
return n1 * t * t;
} else if (t < 2 / d1) {
return n1 * (t -= 1.5 / d1) * t + 0.75;
} else if (t < 2.5 / d1) {
return n1 * (t -= 2.25 / d1) * t + 0.9375;
} else {
return n1 * (t -= 2.625 / d1) * t + 0.984375;
}
}
};
// set up some helpful UX on the form
const durationValueSpan = document.getElementById('durationValue');
const durationInput = document.getElementById('duration');
durationValueSpan.innerHTML = `${durationInput.value / 1000} seconds`;
durationInput.addEventListener('change', (e) => {
durationValueSpan.innerHTML = `${e.target.value / 1000} seconds`;
});
const animateLabel = document.getElementById('animateLabel');
const animateValue = document.getElementById('animate');
animateValue.addEventListener('change', (e) => {
animateLabel.innerHTML = e.target.checked ? 'Yes' : 'No';
});
const map = new vietmapgl.Map({
container: "map",
style:
"https://maps.vietmap.vn/mt/tm/style.json?apikey=YOUR_API_KEY_HERE",
center: [ 106.72301001966926,10.796056815909495],
zoom: 3,
});
map.on('load', async function() {
const image = await map.loadImage("/docs/assets/navigator.png");
map.addImage("vietmap", image.data);
// add a layer to display the map's center point
map.addSource('center', {
'type': 'geojson',
'data': {
'type': 'Point',
'coordinates': [-94, 40]
}
});
map.addLayer({
'id': 'center',
'type': 'symbol',
'source': 'center',
'layout': {
'icon-image': 'vietmap',
'text-field': 'Center: [106, 10]',
'text-offset': [0, 0.6],
'text-anchor': 'top'
}
});
const animateButton = document.getElementById('animateButton');
animateButton.addEventListener('click', () => {
const easingInput = document.getElementById('easing');
const easingFn =
easingFunctions[
easingInput.options[easingInput.selectedIndex].value
];
const duration = parseInt(durationInput.value, 10);
const animate = animateValue.checked;
const offsetX = parseInt(
document.getElementById('offset-x').value,
10
);
const offsetY = parseInt(
document.getElementById('offset-y').value,
10
);
const animationOptions = {
duration,
easing: easingFn,
offset: [offsetX, offsetY],
animate,
essential: true // animation will happen even if user has `prefers-reduced-motion` setting on
};
// Create a random location to fly to by offsetting the map's
// initial center point by up to 10 degrees.
const center = [
106 + (Math.random() - 0.5) * 5,
10 + (Math.random() - 0.5) * 5
];
// merge animationOptions with other flyTo options
animationOptions.center = center;
map.flyTo(animationOptions);
// update 'center' source and layer to show our new map center
// compare this center point to where the camera ends up when an offset is applied
map.getSource('center').setData({
'type': 'Point',
'coordinates': center
});
map.setLayoutProperty(
'center',
'text-field',
`Center: [${
center[0].toFixed(1)
}, ${
center[1].toFixed(1)
}]`
);
});
});
</script>
</body>
</html>
