我有一个应用程序,它使用 JavaScript API 版本 3 在 Google map 上绘制一个矩形数组。这可行,但我想做的是旋转或倾斜每个 Rectangle
基于用户输入。
是Rectangle
对象仅限于水平/垂直线? API 仅将两个角点作为位置,因此我看不到任何旋转这种形状的方法。
我实际上是否必须将形状类型更改为 Polygon
?
最佳答案
Do I in fact have to change the shape type to Polygon?
是的,因为
google.maps.Rectangle
class不支持设置四个顶点的坐标(setBounds
函数只支持设置northeast
和southwest
坐标)下面的示例演示了如何:
工作示例
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 13,
center: { lat: 33.678, lng: -116.243 },
mapTypeId: google.maps.MapTypeId.TERRAIN
});
var rectangle = new google.maps.Rectangle({
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
bounds: {
north: 33.685,
south: 33.671,
east: -116.224,
west: -116.251
}
});
var rectPoly = createPolygonFromRectangle(rectangle); //create a polygom from a rectangle
rectPoly.addListener('click', function(e) {
rotatePolygon(rectPoly,10);
});
document.getElementById('btnRotate').onclick = function() {
window.setInterval(function() {
rotatePolygon(rectPoly, 10);
}, 500);
};
}
function createPolygonFromRectangle(rectangle) {
var map = rectangle.getMap();
var coords = [
{ lat: rectangle.getBounds().getNorthEast().lat(), lng: rectangle.getBounds().getNorthEast().lng() },
{ lat: rectangle.getBounds().getNorthEast().lat(), lng: rectangle.getBounds().getSouthWest().lng() },
{ lat: rectangle.getBounds().getSouthWest().lat(), lng: rectangle.getBounds().getSouthWest().lng() },
{ lat: rectangle.getBounds().getSouthWest().lat(), lng: rectangle.getBounds().getNorthEast().lng() }
];
// Construct the polygon.
var rectPoly = new google.maps.Polygon({
path: coords
});
var properties = ["strokeColor","strokeOpacity","strokeWeight","fillOpacity","fillColor"];
//inherit rectangle properties
var options = {};
properties.forEach(function(property) {
if (rectangle.hasOwnProperty(property)) {
options[property] = rectangle[property];
}
});
rectPoly.setOptions(options);
rectangle.setMap(null);
rectPoly.setMap(map);
return rectPoly;
}
function rotatePolygon(polygon,angle) {
var map = polygon.getMap();
var prj = map.getProjection();
var origin = prj.fromLatLngToPoint(polygon.getPath().getAt(0)); //rotate around first point
var coords = polygon.getPath().getArray().map(function(latLng){
var point = prj.fromLatLngToPoint(latLng);
var rotatedLatLng = prj.fromPointToLatLng(rotatePoint(point,origin,angle));
return {lat: rotatedLatLng.lat(), lng: rotatedLatLng.lng()};
});
polygon.setPath(coords);
}
function rotatePoint(point, origin, angle) {
var angleRad = angle * Math.PI / 180.0;
return {
x: Math.cos(angleRad) * (point.x - origin.x) - Math.sin(angleRad) * (point.y - origin.y) + origin.x,
y: Math.sin(angleRad) * (point.x - origin.x) + Math.cos(angleRad) * (point.y - origin.y) + origin.y
};
}
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 100%;
}
#floating-panel {
position: absolute;
top: 10px;
left: 25%;
z-index: 5;
background-color: #fff;
padding: 5px;
border: 1px solid #999;
text-align: center;
font-family: 'Roboto','sans-serif';
line-height: 30px;
padding-left: 10px;
}
<div id="floating-panel"><input type="button" id="btnRotate" value="Auto Rotate"></div>
<div id="map"></div>
<script async defer src="https://maps.googleapis.com/maps/api/js?callback=initMap"></script>
JSFiddle
关于google-maps - Google Maps API 旋转矩形,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26049552/