index.js
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(function (root, factory) {
if (typeof exports === 'object') {
module.exports = factory();
} else if (typeof define === 'function' && define.amd) {
define(factory);
} else {
root.BMapLib = root.BMapLib || {};
root.BMapLib.CurveLine = root.BMapLib.CurveLine || factory();
}
})(this, function() {
function CurveLine(points, opts) {
try {
BMap;
} catch (e) {
throw Error('Baidu Map JS API is not ready yet!');
}
var self = this;
var curvePoints = getCurvePoints(points);
var polyline = new BMap.Polyline(curvePoints, opts);
polyline.addEventListener('lineupdate', function(){
if (this.isEditing) {
this.enableEditing();
}
});
polyline.cornerPoints = points;
polyline.editMarkers = []; //缂栬緫鍔熻兘鐨勯《鐐�
/**
* 閲嶅啓寮х嚎鐨勭紪杈戝姛鑳�
*/
polyline.enableEditing = function () {
var self = this;
if (self.map) {
self.disableEditing();
for (var i = 0; i < self.cornerPoints.length; i++) {
var marker = new BMap.Marker(self.cornerPoints[i], {
icon: new BMap.Icon('http://api.map.baidu.com/library/CurveLine/1.5/src/circle.png', new BMap.Size(16,16)),
enableDragging: true,
raiseOnDrag: true
});
marker.addEventListener('dragend', function(){
self.cornerPoints.length = 0;
for (var i = 0; i < self.editMarkers.length; i++) {
self.cornerPoints.push(self.editMarkers[i].getPosition());
}
var curvePoints = getCurvePoints(self.cornerPoints)
self.setPath(curvePoints);
});
marker.index = i;
self.editMarkers.push(marker);
self.map.addOverlay(marker);
}
}
self.isEditing = true;
}
/**
* 閲嶅啓寮х嚎鐨勭紪杈戝姛鑳�
*/
polyline.disableEditing = function() {
this.isEditing = false;
//娓呯┖涔嬪墠鐨勭紪杈戠偣
for (var i = 0; i < this.editMarkers.length; i++) {
this.map.removeOverlay(this.editMarkers[i]);
this.editMarkers[i] = null;
}
this.editMarkers.length = 0;
}
/**
* 鑾峰彇寮х嚎鐨勫潗鏍囩偣
*/
polyline.getPath = function() {
return curvePoints;
}
// polyline.points = points; //寮х嚎鐨勫潗鏍囬《鐐�
// polyline.enableEditing = enableEditing;
// polyline.disableEditing = disableEditing;
// polyline.getPath = getPath;
return polyline;
}
function extend(child, parent) {
for (var p in parent) {
if (parent.hasOwnProperty(p)) {
child[p] = parent[p];
}
}
return child;
};
function getCurvePoints(points) {
var curvePoints = [];
for (var i = 0; i < points.length - 1; i++) {
var p = getCurveByTwoPoints(points[i], points[i + 1]);
if (p && p.length > 0) {
curvePoints = curvePoints.concat(p);
}
}
return curvePoints;
}
function getCurveByTwoPoints(obj1, obj2) {
var curveCoordinates = [];
if (!obj1 || !obj2 || !(obj1 instanceof BMap.Point) || !(obj2 instanceof BMap.Point)) {
return null;
}
var B1 = function(x) {
return 1 - 2 * x + x * x;
};
var B2 = function(x) {
return 2 * x - 2 * x * x;
};
var B3 = function(x) {
return x * x;
};
var count=30; // 鏇茬嚎鏄敱涓€浜涘皬鐨勭嚎娈电粍鎴愮殑锛岃繖涓〃绀鸿繖涓洸绾挎墍鏈夊埌鐨勬姌绾跨殑涓暟
var isFuture=false;
var t, h, h2, lat3, lng3, j, t2;
var LnArray = [];
var i = 0;
var inc = 0;
if (typeof(obj2) == "undefined") {
if (typeof(curveCoordinates) != "undefined") {
curveCoordinates = [];
}
return;
}
var lat1 = parseFloat(obj1.lat);
var lat2 = parseFloat(obj2.lat);
var lng1 = parseFloat(obj1.lng);
var lng2 = parseFloat(obj2.lng);
// 璁＄畻鏇茬嚎瑙掑害鐨勬柟娉�
if (lng2 > lng1) {
if (parseFloat(lng2-lng1) > 180) {
if (lng1 < 0) {
lng1 = parseFloat(180 + 180 + lng1);
}
}
}
if (lng1 > lng2) {
if (parseFloat(lng1-lng2) > 180) {
if (lng2 < 0) {
lng2 = parseFloat(180 + 180 + lng2);
}
}
}
j = 0;
t2 = 0;
if (lat2 == lat1) {
t = 0;
h = lng1 - lng2;
} else if (lng2 == lng1) {
t = Math.PI / 2;
h = lat1 - lat2;
} else {
t = Math.atan((lat2 - lat1) / (lng2 - lng1));
h = (lat2 - lat1) / Math.sin(t);
}
if (t2 == 0) {
t2 = (t + (Math.PI / 5));
}
h2 = h / 2;
lng3 = h2 * Math.cos(t2) + lng1;
lat3 = h2 * Math.sin(t2) + lat1;
for (i = 0; i < count + 1; i++) {
curveCoordinates.push(new BMap.Point(
(lng1 * B1(inc) + lng3 * B2(inc)) + lng2 * B3(inc),
(lat1 * B1(inc) + lat3 * B2(inc) + lat2 * B3(inc))
));
inc = inc + (1 / count);
}
return curveCoordinates;
}
return CurveLine;
});