/**

* 定位绘图

*

* @author wuxin

* @time 10:29

*/

public class DrawLocate {

private static Graphic graphicCenterPoint;

private static Graphic graphicErrorRound;

/**

* 绘制定位

* @param center 中心点

* @param radius 误差圆半径(单位：米)

* @param graphicsLayer 绘制图层

* @param centerImage 中心点图片

* @param errorRoundColorFill 误差圆颜色

* @param errorRoundColorLine 误差圆边线颜色

*/

public static void drawPoint(Point center, double radius,

GraphicsLayer graphicsLayer, Drawable centerImage,

int errorRoundColorFill, int errorRoundColorLine) {

/* 清除图层 */

if(graphicsLayer != null){

graphicsLayer.removeAll();

}

/* 绘制中心点 */

PictureMarkerSymbol symbol = new PictureMarkerSymbol(centerImage);

symbol.setOffsetY(10.0f);

graphicCenterPoint = new Graphic(center, symbol);

/* 绘制误差圆 */

if(radius > 0){

Polygon polygon = new Polygon();

getCircle(center, radius, polygon);

FillSymbol fillSymbol = new SimpleFillSymbol(errorRoundColorFill);

fillSymbol.setAlpha(10);

SimpleLineSymbol lineSymbol = new SimpleLineSymbol(errorRoundColorLine, 2.0f, SimpleLineSymbol.STYLE.SOLID);

fillSymbol.setOutline(lineSymbol);

graphicErrorRound = new Graphic(polygon, fillSymbol);

}

/* 绘制上图 */

graphicsLayer.addGraphics(new Graphic[]{graphicCenterPoint, graphicErrorRound});

}

/**

* 获取圆的图形对象

*

* @param center

* @param radius

* @return

*/

public static Polygon getCircle(Point center, double radius) {

Polygon polygon = new Polygon();

getCircle(center, radius, polygon);

return polygon;

}

/**

*

* @param center

* 中心点

* @param radius

* 半径(米)

* @param circle

* 圆的图形对象

*/

private static void getCircle(Point center, double radius, Polygon circle) {

circle.setEmpty();

Point[] points = getPoints(center, radius);

circle.startPath(points[0]);

for (int i = 1; i < points.length; i++)

circle.lineTo(points[i]);

}

/**

* 通过中心点和半径计算得出圆形的边线点集合

*

* @param center

* @param radius

* @return

*/

private static Point[] getPoints(Point center, double radius) {

Point[] points = new Point[50];

double sin;

double cos;

double x;

double y;

for (double i = 0; i < 50; i++) {

sin = Math.sin(Math.PI * 2 * i / 50);

cos = Math.cos(Math.PI * 2 * i / 50);

x = center.getX() + radius * sin;

y = center.getY() + radius * cos;

points[(int) i] = new Point(x, y);

}

return points;

}

}

引用方式:

DrawLocate.drawPoint(point, location.getRadius(), baiduLayer, image, Color.parseColor("#0099FF"), Color.parseColor("#0099FF"));