/**

* 定位繪圖

*

* @author wuxin

* @time 10:29

*/

public class DrawLocate {

private static Graphic graphicCenterPoint;

private static Graphic graphicErrorRound;

/**

* 繪制定位

* @param center 中心點(diǎn)

* @param radius 誤差圓半徑(單位：米)

* @param graphicsLayer 繪制圖層

* @param centerImage 中心點(diǎn)圖片

* @param errorRoundColorFill 誤差圓顏色

* @param errorRoundColorLine 誤差圓邊線顏色

*/

public static void drawPoint(Point center, double radius,

GraphicsLayer graphicsLayer, Drawable centerImage,

int errorRoundColorFill, int errorRoundColorLine) {

/* 清除圖層 */

if(graphicsLayer != null){

graphicsLayer.removeAll();

}

/* 繪制中心點(diǎn) */

PictureMarkerSymbol symbol = new PictureMarkerSymbol(centerImage);

symbol.setOffsetY(10.0f);

graphicCenterPoint = new Graphic(center, symbol);

/* 繪制誤差圓 */

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);

}

/* 繪制上圖 */

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

}

/**

* 獲取圓的圖形對(duì)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

* 中心點(diǎn)

* @param radius

* 半徑(米)

* @param circle

* 圓的圖形對(duì)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]);

}

/**

* 通過中心點(diǎn)和半徑計(jì)算得出圓形的邊線點(diǎn)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"));

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