Android Open Source - android-gps-test-tool Draw Circle

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License

The source code is released under:

Apache License ? 2.0 TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by...

Java Source Code

package com.agup.gps.utils;
/*from w  w  w . j  av a  2 s . c o  m*/
import java.util.Map;

import com.esri.core.geometry.GeometryEngine;
import com.esri.core.geometry.Polygon;

import android.graphics.Point;

public class DrawCircle {
  
  public DrawCircle(){
    
  }
  
  public void createMercatorCircle(double radius, Point center){
    double lon1 = degToRad(center.x);
    double lat1 = degToRad(center.y);
    double R_KM = 6371; //radius km
    double R_MI = 3963; //radius mi
    //double d = radius/R_KM; //angular distance on earth's surface
    double d = radius/R_MI;
    
    Polygon circle = new Polygon();
    int nodes = 100; //number of nodes in circle
    int step = Math.round(360/nodes);
    int n = 0;
    double[] pointArray;
    
    for(int x = 0; x <= 360; x++){
      int z = Math.round(n+=step);
      double bearing = degToRad(x);
      
      double lat2 = Math.asin(
          Math.sin(lat1) * Math.cos(d) +
          Math.cos(lat1) * Math.sin(d) * Math.cos(bearing)
      );
      
      double lon2 = lon1 + Math.atan2(
          Math.sin(bearing) * Math.sin(d) * Math.cos(lat1), 
          Math.cos(d) - Math.sin(lat1) * Math.sin(lat2)
      );
      
      //pointArray[x] = GeometryEngine.project(x, y, sr)
    }
  }
  
  public static double radToDeg(double radians){
    return radians * 180 / Math.PI;
  }
  
  public static double degToRad(double degrees){
    return degrees * Math.PI / 180;
  }
  
}

Java Source Code List

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