我正在制作地图项目,例如在地图上添加形状和位置并将其保存。
但是我在地面覆盖方面遇到了问题。
我知道Google地图文档中不存在旋转属性。 但是我需要一种方法/技巧来通过其他任何方式旋转地面覆盖图像。
此处代码
var srcImage = "http://demo/image/uploads/demo.jpg";
var bounds = {
north: 44.599,
south: 44.490,
east: -78.443,
west: -78.649
}
var overlay = new google.maps.GroundOverlay(srcImage ,bounds);
overlay.setMap(map);
我正在使用滑块旋转叠加。
$("#overlayslider").slider().on('slide',function(e){
var angle = e.newVal;
// i want rotate overlay by angle/degree as per slider
})
我尝试了投影,但是没有成功。
任何可能的方式都会受到赞赏。
任何帮助都会有用,谢谢。
答案 0 :(得分:0)
您可以通过使用自定义叠加层来实现此目的:https://developers.google.com/maps/documentation/javascript/examples/overlay-simple。
将事件侦听器添加到USGSOverlay.prototype.onAdd
中的叠加层滑块,然后在输入上设置div的旋转。
document.getElementById('overlayslider').addEventListener('input', function() {
div.style.transform = 'rotate(' + this.value + 'deg)';
});
这是修改后的自定义覆盖示例:https://jsfiddle.net/b0tLd46u/4/。您可以通过地图上方的范围滑块设置叠加层的旋转。
答案 1 :(得分:0)
这是我的解决方案,主要受This Answer启发
rotated-overlay.ts
export class CustomOverlay extends google.maps.OverlayView {
private div;
constructor(
private bounds: google.maps.LatLngBounds,
private image: string,
private rotation: number
) {
super();
// Define a property to hold the image's div. We'll
// actually create this div upon receipt of the onAdd()
// method so we'll leave it null for now.
this.div = null;
}
/**
* onAdd is called when the map's panes are ready and the overlay has been
* added to the map.
*/
onAdd() {
const div = document.createElement('div');
div.style.borderStyle = 'none';
div.style.borderWidth = '0px';
div.style.position = 'absolute';
// Create the img element and attach it to the div.
const img = document.createElement('img');
img.src = this.image;
img.style.width = '100%';
img.style.height = '100%';
img.style.position = 'absolute';
div.appendChild(img);
this.div = div;
// Add the element to the "overlayLayer" pane.
const panes = this.getPanes();
panes.overlayLayer.appendChild(div);
};
draw() {
// We use the south-west and north-east
// coordinates of the overlay to peg it to the correct position and size.
// To do this, we need to retrieve the projection from the overlay.
const overlayProjection = this.getProjection();
// Retrieve the south-west and north-east coordinates of this overlay
// in LatLngs and convert them to pixel coordinates.
// We'll use these coordinates to resize the div.
const sw = overlayProjection.fromLatLngToDivPixel(this.bounds.getSouthWest());
const ne = overlayProjection.fromLatLngToDivPixel(this.bounds.getNorthEast());
// Resize the image's div to fit the indicated dimensions.
const div = this.div;
div.style.left = sw.x + 'px';
div.style.top = ne.y + 'px';
div.style.width = (ne.x - sw.x) + 'px';
div.style.height = (sw.y - ne.y) + 'px';
div.style.transform = 'rotate(' + this.rotation + 'deg)';
};
// The onRemove() method will be called automatically from the API if
// we ever set the overlay's map property to 'null'.
onRemove() {
this.div.parentNode.removeChild(this.div);
this.div = null;
};
};
map-component.ts
public addOverlay(imageUrl: string, rotation: number, bounds: google.maps.LatLngBounds, map: google.maps.Map){
let overlay = new CustomOverlay(
bounds,
imageUrl,
rotation,
);
overlay.setMap(map);
}