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Better geodesy handling #2345

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merged 16 commits into from
Jan 3, 2014
Merged

Better geodesy handling #2345

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6940b5b
use projected coordinates in Circle, close #1465
mourner Jan 2, 2014
2ee5c90
add CRS.Earth, move Harvesine distance there
mourner Jan 2, 2014
5923a64
add Map distance method, close #1442
mourner Jan 2, 2014
ea1402e
simplify calculations in scale control
mourner Jan 2, 2014
3d34f27
normalize latlng argument in Map wrapLatLng
mourner Jan 2, 2014
9ce2cc5
use simpler distance formula (precision is good enough)
mourner Jan 2, 2014
c4a9418
add low level ellipse rendering support
mourner Jan 2, 2014
0cf887f
fix Travis build false passes when running tests
mourner Jan 2, 2014
7ff0fa9
approximate Circle with ellipse
mourner Jan 2, 2014
06fb3ce
much better circle approximation near poles
mourner Jan 3, 2014
264eca8
don't clamp mercator after 85, simplify projection code
mourner Jan 3, 2014
1929730
fix ellipse disappearing with big radiusY
mourner Jan 3, 2014
5e44101
fix true mercator regression
mourner Jan 3, 2014
dab0cbf
update tests to reflect no clamping near poles
mourner Jan 3, 2014
8f4baae
don't render circles near poles or with 0 radius
mourner Jan 3, 2014
ae8bc57
fix Circle in flat projections
mourner Jan 3, 2014
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much better circle approximation near poles
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@mourner
mourner committed Jan 3, 2014
commit 06fb3ce6e4bab3a9ff3cf5fb71ed2370134db241
25 changes: 15 additions & 10 deletions src/layer/vector/Circle.js
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Original file line number Diff line number Diff line change
Expand Up @@ -32,19 +32,24 @@ L.Circle = L.CircleMarker.extend({

_project: function () {

var lng = this._latlng.lng,
var rad = Math.PI / 180,
lng = this._latlng.lng,
lat = this._latlng.lat,
map = this._map,

latR = 360 * this._mRadius / (2 * L.CRS.Earth.R * Math.PI),
top = map.latLngToLayerPoint([this._latlng.lat + latR, lng]),
bottom = map.latLngToLayerPoint([this._latlng.lat - latR, lng]),
p = this._point = top.add(bottom).divideBy(2),
newLat = map.layerPointToLatLng(p).lat,
lngR = latR / Math.cos(newLat * Math.PI / 180),
left = map.latLngToLayerPoint([newLat, lng - lngR]);
latR = (this._mRadius / L.CRS.Earth.R) / rad,
top = map.project([lat + latR, lng]),
bottom = map.project([lat - latR, lng]),
p = top.add(bottom).divideBy(2),
lat2 = map.unproject(p).lat,

this._radius = Math.max(p.x - left.x, 1);
this._radiusY = Math.max(p.y - top.y, 1);
lngR = Math.acos((Math.cos(latR * rad) - Math.sin(lat * rad) * Math.sin(lat2 * rad)) /
(Math.cos(lat * rad) * Math.cos(lat2 * rad))) / rad || 0,
left = map.project([lat2, lng - lngR]);

this._point = p.subtract(map.getPixelOrigin());
this._radius = Math.max(Math.round(p.x - left.x), 1);
this._radiusY = Math.max(Math.round(p.y - top.y), 1);

this._updateBounds();
}
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