android 学习总结之地图添加要素

最新推荐文章于 2024-08-30 08:00:00 发布

XiaoL_2015

最新推荐文章于 2024-08-30 08:00:00 发布

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分类专栏： android esri 文章标签： android 地图 esri

本文链接：https://blog.youkuaiyun.com/GXX_2015/article/details/51786356

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本文介绍了如何在地图上绘制点和线，并实现不同坐标系间的转换，包括屏幕坐标到地图投影坐标的转换、投影坐标到经纬度坐标的转换等。

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1. 添加点和线元素的方法

private void animDraw(PointBean point) {

        Point pnt = new Point(point.getX(), point.getY());
        Graphic pointGraphic = new Graphic(pnt, new SimpleMarkerSymbol(
                Color.RED, 8, STYLE.CIRCLE));
        setgraphicsLayer.addGraphic(pointGraphic);

        if (point.getId() == 0) {

            Drawable source = getResources().getDrawable(R.drawable.icon_start);
            Point mapPoint = new Point(pnt.getX(), pnt.getY() + 7.5);
            Graphic picGraphic = new Graphic(mapPoint, new PictureMarkerSymbol(
                    source));
            setgraphicsLayer.addGraphic(picGraphic);

        } else if (point.getId() == myapplication.getCount() - 1) {

            Drawable target = getResources().getDrawable(R.drawable.icon_stop);
            Point mapPoint = new Point(pnt.getX(), pnt.getY() + 7.5);
            Graphic picGraphic = new Graphic(mapPoint, new PictureMarkerSymbol(
                    target));
            setgraphicsLayer.addGraphic(picGraphic);
        }

        if (point.getId() == 0) {
            polyline.startPath(pnt);
        } else {
            polyline.lineTo(pnt);
            Graphic lineGraphic = new Graphic(polyline, new SimpleLineSymbol(
                    Color.GREEN, 8, SimpleLineSymbol.STYLE.SOLID));
            setgraphicsLayer.addGraphic(lineGraphic);
        }
    }

2. 地图投影坐标、屏幕坐标及经纬度坐标之间的转换

a. 屏幕坐标转换成投影坐标

public void onSingleTap(float x, float y) {
    Point clickPoint  = mapView.toMapPoint(x,y);

b. 投影坐标转换成经纬度

Point wgsPoint = (Point) GeometryEngine.project(clickPoint ,map.getSpatialReference(),SpatialReference.create(4326));

c. 经纬度转换成投影坐标

Point mapPoint = (Point) GeometryEngine.project(wgsPoint ,SpatialReference.create(4326),map.getSpatialReference());

d. 投影坐标转换成屏幕坐标

Point screenPoint = map.toScreenPoint(mapPoint);;