Android Open Source - smartnavi Polygon

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License

The source code is released under:
Apache License
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Java Source Code

package org.osmdroid.bonuspack.overlays;
//from   w  w  w .j  a va  2 s  .  co m
import java.util.ArrayList;
import java.util.List;
import org.osmdroid.DefaultResourceProxyImpl;
import org.osmdroid.ResourceProxy;
import org.osmdroid.util.GeoPoint;
import org.osmdroid.views.MapView;
import org.osmdroid.views.Projection;
import org.osmdroid.views.overlay.Overlay;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;
import android.graphics.RectF;
import android.graphics.Region;
import android.view.MotionEvent;

/**
 * A polygon on the earth's surface. 
 * Mimics the Polygon class from Google Maps Android API v2 as much as possible. Main differences:<br/>
 * - Doesn't support: Z-Index, Geodesic mode<br/>
 * - Supports InfoWindow. 
 * 
 * @author Viesturs Zarins, Martin Pearman for efficient PathOverlay.draw method
 * @author M.Kergall: transformation from PathOverlay to Polygon
 */
public class Polygon extends Overlay {

  /** inner class holding one ring: the polygon outline, or a hole inside the polygon */
  class LinearRing {
    /** original GeoPoints */
    int mOriginalPoints[][]; //as an array, to reduce object creation
    
    /** Stores points, converted to the map projection. */
    ArrayList<Point> mConvertedPoints;

    /** is precomputation of points done or not */
    boolean mPrecomputed;
    
    LinearRing(){
      mOriginalPoints = new int[0][2];
      mConvertedPoints = new ArrayList<Point>(0);
      mPrecomputed = false;
    }
    
    ArrayList<GeoPoint> getPoints(){
      int size = mOriginalPoints.length;
      ArrayList<GeoPoint> result = new ArrayList<GeoPoint>(size);
      for (int i=0; i<size; i++){
        GeoPoint gp = new GeoPoint(mOriginalPoints[i][0], mOriginalPoints[i][1]);
        result.add(gp);
      }
      return result;
    }
    
    void setPoints(final List<GeoPoint> points) {
      int size = points.size();
      mOriginalPoints = new int[size][2];
      mConvertedPoints = new ArrayList<Point>(size);
      int i=0;
      for (GeoPoint p:points){
        mOriginalPoints[i][0] = p.getLatitudeE6();
        mOriginalPoints[i][1] = p.getLongitudeE6();
        mConvertedPoints.add(new Point(p.getLatitudeE6(), p.getLongitudeE6()));
        i++;
      }
      mPrecomputed = false;
    }
    
    /** 
     * Note - highly optimized to handle long paths, proceed with care.
     * Should be fine up to 10K points.
     */
    protected void buildPathPortion(Projection pj){
      final int size = mConvertedPoints.size();
      if (size < 2) // nothing to paint
        return;

      // precompute new points to the intermediate projection.
      if (!mPrecomputed){
        for (int i=0; i<size; i++) {
          final Point pt = mConvertedPoints.get(i);
          pj.toProjectedPixels(pt.x, pt.y, pt);
        }
        mPrecomputed = true;
      }

      Point projectedPoint0 = mConvertedPoints.get(0); // points from the points list
      Point projectedPoint1;
      
      Point screenPoint0 = pj.toPixelsFromProjected(projectedPoint0, mTempPoint1); // points on screen
      Point screenPoint1;
      
      mPath.moveTo(screenPoint0.x, screenPoint0.y);
      
      for (int i=0; i<size; i++) {
        // compute next points
        projectedPoint1 = mConvertedPoints.get(i);
        screenPoint1 = pj.toPixelsFromProjected(projectedPoint1, mTempPoint2);

        if (Math.abs(screenPoint1.x - screenPoint0.x) + Math.abs(screenPoint1.y - screenPoint0.y) <= 1) {
          // skip this point, too close to previous point
          continue;
        }

        mPath.lineTo(screenPoint1.x, screenPoint1.y);

        // update starting point to next position
        projectedPoint0 = projectedPoint1;
        screenPoint0.x = screenPoint1.x;
        screenPoint0.y = screenPoint1.y;
      }
      mPath.close();
    }
    
  }

  private LinearRing mOutline;
  private ArrayList<LinearRing> mHoles;
  
  /** Paint settings. */
  protected Paint mFillPaint;
  protected Paint mOutlinePaint;

  private final Path mPath = new Path(); //Path drawn is kept for click detection

  private final Point mTempPoint1 = new Point();
  private final Point mTempPoint2 = new Point();

  //InfoWindow handling
  protected String mTitle, mSnippet;
  protected InfoWindow mInfoWindow;
  
  // ===========================================================
  // Constructors
  // ===========================================================

  public Polygon(final Context ctx) {
    this(new DefaultResourceProxyImpl(ctx));
  }

  public Polygon(final ResourceProxy resourceProxy) {
    super(resourceProxy);
    mFillPaint = new Paint();
    mFillPaint.setColor(Color.TRANSPARENT);
    mFillPaint.setStyle(Paint.Style.FILL);
    mOutlinePaint = new Paint();
    mOutlinePaint.setColor(Color.BLACK);
    mOutlinePaint.setStrokeWidth(10.0f);
    mOutlinePaint.setStyle(Paint.Style.STROKE);
    mOutline = new LinearRing();
    mHoles = new ArrayList<LinearRing>(0);
    /*
    mTitle = null;
    mSnippet = null;
    mBubble = null;
    */
    mPath.setFillType(Path.FillType.EVEN_ODD); //for correct support of holes
  }

  // ===========================================================
  // Getter & Setter
  // ===========================================================

  public int getFillColor() {
    return mFillPaint.getColor();
  }

  public int getStrokeColor() {
    return mOutlinePaint.getColor();
  }

  public float getStrokeWidth() {
    return mOutlinePaint.getStrokeWidth();
  }
  
  /**
   * @return a copy of the list of polygon's vertices. 
   */
  public List<GeoPoint> getPoints(){
    return mOutline.getPoints();
  }

  public boolean isVisible(){
    return isEnabled();
  }
  
  public void setFillColor(final int fillColor) {
    mFillPaint.setColor(fillColor);
  }

  public void setStrokeColor(final int color) {
    mOutlinePaint.setColor(color);
  }
  
  public void setStrokeWidth(final float width) {
    mOutlinePaint.setStrokeWidth(width);
  }
  
  public void setVisible(boolean visible){
    setEnabled(visible);
  }

  /**
   * This method will take a copy of the points.
   */
  public void setPoints(final List<GeoPoint> points) {
    mOutline.setPoints(points);
  }

  public void setHoles(List<? extends List<GeoPoint>> holes){
    mHoles = new ArrayList<LinearRing>(holes.size());
    for (List<GeoPoint> sourceHole:holes){
      LinearRing newHole = new LinearRing();
      newHole.setPoints(sourceHole);
      mHoles.add(newHole);
    }
  }

  public List<ArrayList<GeoPoint>> getHoles(){
    ArrayList<ArrayList<GeoPoint>> result = new ArrayList<ArrayList<GeoPoint>>(mHoles.size());
    for (LinearRing hole:mHoles){
      result.add(hole.getPoints());
    }
    return result;
  }

  /**
   * Set the points of the Polygon as a circle. 
   * @param center center of the circle
   * @param radiusInMeters
   */
  public void setPointsAsCircle(GeoPoint center, double radiusInMeters){
    ArrayList<GeoPoint> circlePoints = new ArrayList<GeoPoint>(360/6);
    for (int f = 0; f < 360; f += 6){
      GeoPoint onCircle = center.destinationPoint(radiusInMeters, f);
      circlePoints.add(onCircle);
    }
    setPoints(circlePoints);
  }
  
  public void setTitle(String title){
    mTitle = title;
  }
  
  public void setSnippet(String snippet){
    mSnippet = snippet;
  }
  
  public String getTitle(){
    return mTitle;
  }
  
  public String getSnippet(){
    return mSnippet;
  }

  /** By default, Polygon has no InfoWindow and do not react to a tap. 
   * @param infoWindow the InfoWindow to be opened when tapping the Polygon. 
   * Note that this InfoWindow will receive an ExtendedOverlayItem (not a Polygon) as an input, 
   * so it MUST be able to handle ExtendedOverlayItem attributes. It will be typically a DefaultInfoWindow. 
   * Set it to null to remove an existing InfoWindow. 
   */
  public void setInfoWindow(InfoWindow infoWindow){
    mInfoWindow = infoWindow; //new DefaultInfoWindow(layoutResId, mapView);
  }
  
  @Override protected void draw(Canvas canvas, MapView mapView, boolean shadow) {

    if (shadow) {
      return;
    }

    final Projection pj = mapView.getProjection();
    mPath.rewind();
    
    mOutline.buildPathPortion(pj);
    
    for (LinearRing hole:mHoles){
      hole.buildPathPortion(pj);
    }
    
    canvas.drawPath(mPath, mFillPaint);
    canvas.drawPath(mPath, mOutlinePaint);
  }
  
  /** Important note: this function returns correct results only if the Polygon has been drawn before, 
   * and if the MapView positioning has not changed. 
   * @param event
   * @param mapView
   * @return true if the Polygon contains the event position. 
   */
  public boolean contains(MotionEvent event, MapView mapView){
    if (mPath.isEmpty())
      return false;
    RectF bounds = new RectF(); //bounds of the Path
    mPath.computeBounds(bounds, true);
    Region region = new Region();
    //Path has been computed in #draw (we assume that if it can be clicked, it has been drawn before). 
    region.setPath(mPath, new Region((int)bounds.left, (int)bounds.top, 
        (int) (bounds.right), (int) (bounds.bottom)));
    return region.contains((int)event.getX(), (int)event.getY());
  }
  
  @Override public boolean onSingleTapConfirmed(final MotionEvent event, final MapView mapView){
    if (mInfoWindow == null)
      //no support for tap:
      return false;
    boolean touched = contains(event, mapView);
    if (touched){
      Projection pj = mapView.getProjection();
      GeoPoint position = (GeoPoint)pj.fromPixels((int)event.getX(), (int)event.getY());
      //as DefaultInfoWindow is expecting an ExtendedOverlayItem, build an ExtendedOverlayItem with needed information:
      ExtendedOverlayItem item = new ExtendedOverlayItem(mTitle, mSnippet, position);
      mInfoWindow.open(item, item.getPoint(), 0, 0);
    }
    return touched;
  }
}
Java Source Code List
