Android Open Source - GeoAlarms Alarm Overlay

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Back to project page GeoAlarms.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.geoalarms.map;
//  w ww.j  av  a  2 s. co  m
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.drawable.Drawable;
import android.graphics.Point;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.Projection;

import com.geoalarms.R;
import com.geoalarms.GeoAlarms;
import com.geoalarms.model.Alarm;
import com.geoalarms.model.Coordinates;


public class AlarmOverlay extends Overlay {

  public Alarm alarm;
  private Bitmap alarmIcon;

  public AlarmOverlay(Alarm alarm) {
    this.alarm = alarm;

        // icon
        Context context = GeoAlarms.context;
        Resources res = context.getResources();
        this.alarmIcon = BitmapFactory.decodeResource(res, R.drawable.app_icon);
  }

  @Override
  public void draw(Canvas canvas, MapView mapView, boolean shadow) {
    if (shadow == false) {
      // get point
            Projection projection = mapView.getProjection();
      Point center = new Point();

      // coordinates to convert
      Coordinates coords = this.alarm.coordinates;
      GeoPoint point = coords.toGeoPoint();

      // put in `center` the coordinates in pixels
      projection.toPixels(point, center);
      
      // draw radius
      float radius = projection.metersToEquatorPixels((float) this.alarm.radius);
      Paint circlePaint = new Paint();
      circlePaint.setColor(0x30000000);
      circlePaint.setStyle(Style.FILL_AND_STROKE);
      // TODO: draw the circle calculating `radius`
      canvas.drawCircle(center.x, 
                        center.y, 
                        (int) radius, 
                        circlePaint);
      
      // draw alarm name
      Paint textPaint = new Paint();
      textPaint.setColor(Color.RED);
      canvas.drawText(alarm.name, center.x, center.y, textPaint);

      // draw map pin
        canvas.drawBitmap(this.alarmIcon, 
                          center.x - alarmIcon.getWidth() / 2, 
                          center.y - alarmIcon.getHeight(), 
                          null);
    
      super.draw(canvas, mapView, shadow);
    }
  }
}

Java Source Code List

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