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rotate icon in animate a point along a route example #6553

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rotate icon in animate a point along a route example #6553

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26 changes: 20 additions & 6 deletions docs/pages/example/animate-point-along-route.html
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Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,7 @@
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": origin
Expand All @@ -75,9 +76,14 @@

var arc = [];

// Number of steps to use in the arc and animation, more steps means
// a smoother arc and animation, but too many steps will result in a
// low frame rate
var steps = 500;

// Draw an arc between the `origin` & `destination` of the two points
for (var i = 0; i < lineDistance; i++) {
var segment = turf.along(route.features[0], i / 1000 * lineDistance, 'kilometers');
for (var i = 0; i < lineDistance; i += lineDistance / steps) {
var segment = turf.along(route.features[0], i, 'kilometers');
arc.push(segment.geometry.coordinates);
}

Expand Down Expand Up @@ -115,7 +121,8 @@
"type": "symbol",
"layout": {
"icon-image": "airport-15",
"icon-rotate": 90,
"icon-rotate": { "type": "identity", "property": "bearing"},
"icon-rotation-alignment": "map",
"icon-allow-overlap": true
}
});
Expand All @@ -125,12 +132,19 @@
// the index to access the arc.
point.features[0].geometry.coordinates = route.features[0].geometry.coordinates[counter];

// Calculate the bearing to ensure the icon is rotated to match the route arc
// The bearing is calculate between the current point and the next point, except
// at the end of the arc use the previous point and the current point
point.features[0].properties.bearing = turf.bearing(
turf.point(route.features[0].geometry.coordinates[counter >= steps ? counter - 1 : counter]),
turf.point(route.features[0].geometry.coordinates[counter >= steps ? counter : counter + 1])
);

// Update the source with this new data.
map.getSource('point').setData(point);

// Request the next frame of animation so long as destination has not
// been reached.
if (point.features[0].geometry.coordinates[0] !== destination[0]) {
// Request the next frame of animation so long the end has not been reached.
if (counter < steps) {
requestAnimationFrame(animate);
}

Expand Down