javascript - Google Maps, Ellipse inside rectangle bounds -


i'm using great google maps shapes library draw ellipses on map 4 given points, trouble ellipse breaking boundaries of "rectangle/square" envisaged.

[edit- updated image]

see graphic example of how it's breaking boundaries:

enter image description here

the pink points bounding rectangle want (ignore green ones)

how keep ellipse inside bounds (the goal here being matches outer reaches of blue/gree , orange line originating centre.)

[edit]

the placement of some markers these change depending on user input

_s.oval_markers = [     // top     new google.maps.latlng(51.583487043925224, -0.16044229844476376),     // right     new google.maps.latlng(51.58339184515312, -0.16013348842307096),     // bottom     new google.maps.latlng(51.58317916077958, -0.16026707625337622),     // left     new google.maps.latlng(51.583331361647325, -0.16064041535150864) ];

the code i'm using create oval (modified posting clarity of variables)

var b = new _g.latlngbounds();  _s.oval_markers.foreach(function (m) {     b.extend(m); });  var major_axis = _gs.computedistancebetween(     b.getnortheast(),     new _g.latlng(         b.getsouthwest().lat(),         b.getnortheast().lng()     ) ) / 2; var minor_axis = _gs.computedistancebetween(     new _g.latlng(b.getcenter().lat(), b.getsouthwest().lng()),     new _g.latlng(b.getcenter().lat(), b.getnortheast().lng()) ) / 2;

your minor axis calculation wrong. right now, you're making ellipse pass through 4 points. instead of doing this, need compute distance between edges. in other words:

var minoraxis = _gs.computedistancebetween(_m[1], _m[3]); var majoraxis = _gs.computedistancebetween(_m[1], _m[2]);

(assuming 1 vertex connected 2 , 3)

this give smaller axis lengths, looking for. next step define orientation of it. have never drawn ellipse in google maps, won't able on one.

http://mathworld.wolfram.com/ellipse.html useful ellipse info, way, including list of formulas bound eclipses various shapes.


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