在Google地图上显示风向 [英] Show wind direction on Google Maps
本文介绍了在Google地图上显示风向的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
例如: p>
//丰富标记的内容元素
var richMarkerContent = document.createElement(' DIV');
// arrow image
var arrowImage = new Image();
arrowImage.src ='http://www.openclipart.org/image/250px/'+
'svg_to_png / Anonymous_Arrow_Down_Green.png';
//旋转程度
var directionDeg = 144;
//为箭头创建一个容器
var rotationElement = document.createElement('div');
var rotationStyles ='display:block;'+
'-ms-transform:rotate(%rotationdeg);'+
'-o-transform:rotate(%rotationdeg);'+
'-moz-transform:rotate(%rotationdeg);'+
'-webkit-transform:rotate(%rotationdeg);';
//用directionDeg $ b $替换%rotation。rotationStyles = rotationStyles.split('%rotation')。join(directionDeg);
rotationElement.setAttribute('style',rotationStyles);
rotationElement.setAttribute('alt','arrow');
//将图像追加到旋转容器元素
rotationElement.appendChild(arrowImage);
//将旋转容器附加到richMarker内容元素
richMarkerContent.appendChild(rotationElement);
//创建丰富的标记(位置和地图是谷歌地图对象)
新的RichMarker(
{
位置:位置,
map:map,
draggable:false,
flat:true,
anchor:RichMarkerPosition.TOP_RIGHT,
content:richMarkerContent.innerHTML
}
) ;
I calculated the wind direction and now I want to show the wind direction pointing to 144 degrees (on compass). How can I show this arrow on Google Maps?
解决方案
- In order to show an arrow over a google map you can create a Rich Marker that embed an image using the google-maps-utility-library-v3,
- Next apply a rotation in degree to the image element with css3 tranformations.
In example :
// content element of a rich marker
var richMarkerContent = document.createElement('div');
// arrow image
var arrowImage = new Image();
arrowImage.src = 'http://www.openclipart.org/image/250px/' +
'svg_to_png/Anonymous_Arrow_Down_Green.png';
// rotation in degree
var directionDeg = 144 ;
// create a container for the arrow
var rotationElement = document.createElement('div');
var rotationStyles = 'display:block;' +
'-ms-transform: rotate(%rotationdeg);' +
'-o-transform: rotate(%rotationdeg);' +
'-moz-transform: rotate(%rotationdeg);' +
'-webkit-transform: rotate(%rotationdeg);' ;
// replace %rotation with the value of directionDeg
rotationStyles = rotationStyles.split('%rotation').join(directionDeg);
rotationElement.setAttribute('style', rotationStyles);
rotationElement.setAttribute('alt', 'arrow');
// append image into the rotation container element
rotationElement.appendChild(arrowImage);
// append rotation container into the richMarker content element
richMarkerContent.appendChild(rotationElement);
// create a rich marker ("position" and "map" are google maps objects)
new RichMarker(
{
position : position,
map : map,
draggable : false,
flat : true,
anchor : RichMarkerPosition.TOP_RIGHT,
content : richMarkerContent.innerHTML
}
);
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