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fixes #6867 - map.getBounds() works with rotated map #6875

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merged 2 commits into from
Jul 9, 2018
Merged

fixes #6867 - map.getBounds() works with rotated map #6875

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bb430ac
fixes #6867 - map.getBounds() works with rotated map
zoltan-mihalyi Jun 27, 2018
64819b1
Fix getBounds() for bearings between 90 and 270 as well; update docs
jfirebaugh Jul 9, 2018
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64 changes: 64 additions & 0 deletions debug/bounds.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,64 @@
<!DOCTYPE html>
<html>
<head>
<title>Mapbox GL JS debug page</title>
<meta charset='utf-8'>
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
<link rel='stylesheet' href='/dist/mapbox-gl.css' />
<style>
body { margin: 0; padding: 0; }
html, body, #map { height: 100%; }
</style>
</head>

<body>
<div id='map'></div>

<script src='/dist/mapbox-gl-dev.js'></script>
<script src='/debug/access_token_generated.js'></script>
<script>

var map = window.map = new mapboxgl.Map({
container: 'map',
zoom: 12.5,
center: [-77.01866, 38.888],
style: 'mapbox://styles/mapbox/streets-v10',
hash: true
});

function geojson() {
const bounds = map.getBounds();
return {
type: 'Polygon',
coordinates: [[
bounds.getNorthEast().toArray(),
bounds.getNorthWest().toArray(),
bounds.getSouthWest().toArray(),
bounds.getSouthEast().toArray(),
bounds.getNorthEast().toArray()
]]
};
}

map.on('load', () => {
map.addSource('bounds', {
type: 'geojson',
data: geojson()
});

map.addLayer({
id: 'bounds',
type: 'fill',
source: 'bounds',
paint: {
'fill-color': "rgba(255,0,0,0.2)"
}
});

map.on('rotateend', () => {
map.getSource('bounds').setData(geojson());
});
});
</script>
</body>
</html>
20 changes: 8 additions & 12 deletions src/ui/map.js
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Original file line number Diff line number Diff line change
Expand Up @@ -457,21 +457,17 @@ class Map extends Camera {
}

/**
* Returns the map's geographical bounds.
* Returns the map's geographical bounds. When the bearing or pitch is non-zero, the visible region is not
* an axis-aligned rectangle, and the result is the smallest bounds that encompasses the visible region.
*
* @returns {LngLatBounds} The map's geographical bounds.
* @returns {LngLatBounds}
*/
getBounds() {
const bounds = new LngLatBounds(
this.transform.pointLocation(new Point(0, this.transform.height)),
this.transform.pointLocation(new Point(this.transform.width, 0)));

if (this.transform.angle || this.transform.pitch) {
bounds.extend(this.transform.pointLocation(new Point(this.transform.size.x, 0)));
bounds.extend(this.transform.pointLocation(new Point(0, this.transform.size.y)));
}

return bounds;
return new LngLatBounds()
.extend(this.transform.pointLocation(new Point(0, 0)))
.extend(this.transform.pointLocation(new Point(this.transform.width, 0)))
.extend(this.transform.pointLocation(new Point(this.transform.width, this.transform.height)))
.extend(this.transform.pointLocation(new Point(0, this.transform.height)));
}

/**
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9 changes: 8 additions & 1 deletion test/unit/ui/map.test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -557,9 +557,16 @@ test('Map', (t) => {
t.test('rotated bounds', (t) => {
const map = createMap(t, { zoom: 1, bearing: 45, skipCSSStub: true });
t.deepEqual(
toFixed([[-49.718445552178764, 0], [49.7184455522, 0]]),
toFixed([[-49.718445552178764, -44.44541580601936], [49.7184455522, 44.445415806019355]]),
toFixed(map.getBounds().toArray())
);

map.setBearing(135);
t.deepEqual(
toFixed([[-49.718445552178764, -44.44541580601936], [49.7184455522, 44.445415806019355]]),
toFixed(map.getBounds().toArray())
);

t.end();
});

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