[英]How to make overlay div in google map dragable?
我需要拖动div的位置。 我用下面的代码,但没有用。 我认为我在这里犯了一些错误。我还需要旋转div,以便可以将图像放置在正确的位置
var overlay;
DebugOverlay.prototype = new google.maps.OverlayView();
function initialize() {
var mapOptions = {
zoom: 15,
center: new google.maps.LatLng(40.743388, -74.007592)
};
var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
var swBound = new google.maps.LatLng(40.73660837340877, -74.01852328);
var neBound = new google.maps.LatLng(40.75214181, -73.99661518216243);
var bounds = new google.maps.LatLngBounds(swBound, neBound);
var srcImage = 'http://library.marist.edu/pix/LibMap3.jpg';
overlay = new DebugOverlay(bounds, srcImage, map);
var markerA = new google.maps.Marker({
position: swBound,
map: map,
draggable: true
});
var markerB = new google.maps.Marker({
position: neBound,
map: map,
draggable: true
});
google.maps.event.addListener(markerA, 'drag', function () {
var newPointA = markerA.getPosition();
var newPointB = markerB.getPosition();
var newBounds = new google.maps.LatLngBounds(newPointA, newPointB);
overlay.updateBounds(newBounds);
});
google.maps.event.addListener(markerB, 'drag', function () {
var newPointA = markerA.getPosition();
var newPointB = markerB.getPosition();
var newBounds = new google.maps.LatLngBounds(newPointA, newPointB);
overlay.updateBounds(newBounds);
});
google.maps.event.addListener(markerA, 'dragend', function () {
var newPointA = markerA.getPosition();
var newPointB = markerB.getPosition();
console.log("point1" + newPointA);
console.log("point2" + newPointB);
});
google.maps.event.addListener(markerB, 'dragend', function () {
var newPointA = markerA.getPosition();
var newPointB = markerB.getPosition();
console.log("point1" + newPointA);
console.log("point2" + newPointB);
});
}
function DebugOverlay(bounds, image, map) {
this.bounds_ = bounds;
this.image_ = image;
this.map_ = map;
this.div_ = null;
this.setMap(map);
}
DebugOverlay.prototype.onAdd = function () {
var div = document.createElement('div');
div.style.borderStyle = 'none';
div.style.borderWidth = '0px';
div.style.position = 'absolute';
var img = document.createElement('img');
img.src = this.image_;
img.style.width = '100%';
img.style.height = '100%';
img.style.opacity = '0.5';
img.style.position = 'absolute';
div.appendChild(img);
this.div_ = div;
var panes = this.getPanes();
panes.overlayLayer.appendChild(div);
};
DebugOverlay.prototype.draw = function () {
debugger;
var overlayProjection = this.getProjection();
var sw = overlayProjection.fromLatLngToDivPixel(this.bounds_.getSouthWest());
var ne = overlayProjection.fromLatLngToDivPixel(this.bounds_.getNorthEast());
var 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';
};
DebugOverlay.prototype.updateBounds = function (bounds) {
this.bounds_ = bounds;
this.draw();
};
DebugOverlay.prototype.onRemove = function () {
this.div_.parentNode.removeChild(this.div_);
this.div_ = null;
};
google.maps.event.addDomListener(window, 'load', initialize);
(我花的时间比刚开始时花了太多时间...)
据我了解您的问题和代码,您想直接拖动地面地图图像,并在其后跟角标记,对吗?
HTML5支持拖动事件。 http://www.w3schools.com/html/html5_draganddrop.asp
但是,在Google Maps v3中,所有鼠标事件均由Google Maps捕获。 这是窍门。
捕获鼠标事件
为了捕获鼠标事件,需要在divideMouseTarget窗格中插入一个div(在我的代码中名为mouseTarget )。 overlayMouseTarget是Google Maps v3中最顶层的图层。
但是它将.style.display=none
为正常状态(不拖动)。 仅当您在mouseTarget div上向下拖动时,它才变为.style.display=block
。
但是,即使处于正常状态,mouseTarget div也必须赶上图像的位置。
拖曳事件
当您将鼠标移到mouseTarget上时,必须立即取消该事件,以防止拖动地图。
然后,您需要自己处理dragstart , drag和dragleave事件。 这意味着您需要跟随鼠标光标的位置,然后重新计算图像位置和标记位置。
这是我对第一个问题的回答, I need to drag the position of the div.
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