我想通过在折线中使用SVG路径在谷歌地图绘制贝塞尔曲线。起初我使用了一个标记,而不是类似于Curved line between two near points in google maps,这给了我后面的结果。但是,由于无法在标记下拖动地图,因此我无法使用此方法。使用谷歌地图折线绘制贝塞尔曲线
所以我切换到了折线而不是标记。现在,当我缩小时,我获得了同样的好结果,但是当我放大曲线变成“裁剪”时。
下面是代码:
function initialize() {
var mapOptions = {
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
var coord1 = new google.maps.LatLng(49.165876, -123.152446);
var coord2 = new google.maps.LatLng(25.786328, -80.193694);
var bounds = new google.maps.LatLngBounds();
bounds.extend(coord1);
bounds.extend(coord2);
map.fitBounds(bounds);
pLineOpt = {
path: [coord1, coord2],
strokeWeight: 4,
strokeOpacity: 0,
map: map,
}
pLine = new google.maps.Polyline(pLineOpt);
var markers = [
new google.maps.Marker({
position: coord1,
map: map
}),
new google.maps.Marker({
position: coord2,
map: map
})
];
google.maps.event.addListener(map, 'zoom_changed', function() {
//points
var p1 = map.getProjection().fromLatLngToPoint(coord1);
var p2 = map.getProjection().fromLatLngToPoint(coord2);
//distance between points
var d = new google.maps.Point(p2.x - p1.x, p2.y - p1.y);
var lengthSqr = d.x * d.x + d.y * d.y;
//middle point
var m = new google.maps.Point(d.x/2, d.y/2);
//slope of perpendicular line
var perpK = -d.x/d.y;
//distance to control point
var ratioDistanceControlLengthSqr = 9;
var controlDSqr = lengthSqr/ratioDistanceControlLengthSqr;
var p3dX = Math.sqrt(controlDSqr/(Math.pow(perpK, 2) + 1));
var p3dY = perpK * p3dX;
//control point
var p3 = new google.maps.Point(m.x - p3dX, m.y - p3dY);
//curve path
var path = "M 0 0 q " + p3.x + " " + p3.y + " " + d.x + " " + d.y;
//calc scale
var zoom = map.getZoom();
var scale = 1/(Math.pow(2, -zoom));
var icon = {
path: path,
scale: scale,
strokeWeight: 3,
strokeOpacity: 1,
};
pLineOpt.icons = [{
fixedRotation: true,
icon: icon,
offset: '0'
}];
pLine.setOptions(pLineOpt);
});
}
google.maps.event.addDomListener(window, 'load', initialize);
我已与代码的jsfiddle:http://jsfiddle.net/s7djLzyd/3/
有谁知道为什么折线缩放时裁剪,以及是否有办法解决?
感谢
折线是在[瓦片边界]被裁剪(http://jsfiddle.net/s7djLzyd/ 4 /)。看到这发生了很多次,不知道为什么它发生在你的特定情况下,但可能是API平铺渲染折线的错误。首先,我总是提出奇怪的问题,尝试API的发布和冻结版本,[这在这种情况下不起作用](http://jsfiddle.net/s7djLzyd/5/)。 – geocodezip