Class: EarthCompass

// 添加指南针控件 使用3d内元素创建
 var compass = app.addControl(new THING.EarthCompass({
      'image': 'https://speech.uinnova.com/static/images/compass.png',
      'offset': [50, 50],//选填 偏移值 x y  默认值 25
      'position': THING.CornerType.RightTop //选填 默认值 RightBottom
    })
 );

 function create_html() {
        var html
            = `<div id='earthCompass' style="position: absolute;top: 50px;right: 50px;z-index: 10;">
               <image src='https://www.thingjs.com/uearth/res/compass.png' width=50 height=50></image>
        </div>`;
        return $(html)[0];
    }
 var elem = create_html();

 // 添加指南针控件 使用dom元素创建 指北针不在3d内
 app.addControl(new THING.EarthCompass({
        useElement: true,
        element: elem,
        rotateToNorthSpeed: 0.5
    })
 );