浅念
67 lines
1.8 KiB
JavaScript
67 lines
1.8 KiB
JavaScript
var utils = require('cordova/utils'),
|
|
LatLngBounds = require('./LatLngBounds');
|
|
|
|
/*****************************************************************************
|
|
* VisibleRegion Class
|
|
*****************************************************************************/
|
|
var VisibleRegion = function(southwest, northeast, farLeft, farRight, nearLeft, nearRight) {
|
|
Object.defineProperty(this, 'type', {
|
|
value: 'VisibleRegion',
|
|
writable: false
|
|
});
|
|
this.southwest = southwest;
|
|
this.northeast = northeast;
|
|
this.farLeft = farLeft;
|
|
this.farRight = farRight;
|
|
this.nearLeft = nearLeft;
|
|
this.nearRight = nearRight;
|
|
};
|
|
|
|
utils.extend(VisibleRegion, LatLngBounds);
|
|
|
|
delete VisibleRegion.prototype.extend;
|
|
delete VisibleRegion.prototype.getCenter;
|
|
|
|
VisibleRegion.prototype.contains = function(latLng) {
|
|
if (!latLng || !('lat' in latLng) || !('lng' in latLng)) {
|
|
return false;
|
|
}
|
|
var y = latLng.lat,
|
|
x = latLng.lng;
|
|
|
|
var y90 = y + 90;
|
|
var south = this.southwest.lat,
|
|
north = this.northeast.lat,
|
|
west = this.southwest.lng,
|
|
east = this.northeast.lng;
|
|
var south90 = south + 90,
|
|
north90 = north + 90;
|
|
|
|
var containX = false,
|
|
containY = false;
|
|
|
|
if (east >= 0 && west >= east) {
|
|
if (x <= 0 && x >= -180) {
|
|
containX = true;
|
|
} else {
|
|
containX = (west <= x && x <= east);
|
|
}
|
|
} else if (west <= 0 && east <= west) {
|
|
containX = (west <= x && x <= east);
|
|
if (x >= 0 && x <= 180) {
|
|
containX = true;
|
|
} else {
|
|
containX = (x <= 0 && x <= west || x <= east && x>= -180);
|
|
}
|
|
} else {
|
|
return LatLngBounds.prototype.contains.call(this, latLng);
|
|
}
|
|
|
|
containY = (south90 <= y90 && y90 <= north90) || //#a
|
|
(south >= 0 && north <= 0 && ((south <= y && y <= 90) || (y >= -90 && y<= north))); // #d
|
|
|
|
return containX && containY;
|
|
};
|
|
|
|
module.exports = VisibleRegion;
|