Android Open Source - Android_OSM_offlinemap Current Position Drawable

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License

The source code is released under:

GNU General Public License

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Java Source Code

package com.vellut.offlinemap;
//from w  ww .j  a  v  a2  s .  c  o  m
import org.mapsforge.android.maps.MapView;
import org.mapsforge.android.maps.Projection;
import org.mapsforge.android.maps.overlay.ItemizedOverlay;

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;

public class CurrentPositionDrawable extends Drawable {

  private boolean showAccuracy;
  private float accuracy;
  private Paint accuracyPaintSurface;
  private Paint accuracyPaintBorder;
  private Drawable currentPositionMarker;
  private MapView mapView;

  // Mapview is necessary to get the conversion factor from accuracy to pixels
  public CurrentPositionDrawable(MapView mapView, Drawable currentPositionMarker,
      boolean showAccuracy, int accuracyColor) {
    this.currentPositionMarker = currentPositionMarker;
    this.showAccuracy = showAccuracy;
    this.mapView = mapView;

    // Center the marker
    ItemizedOverlay.boundCenter(currentPositionMarker);
    setBounds(currentPositionMarker.copyBounds());

    accuracyPaintSurface = new Paint();
    accuracyPaintSurface.setStyle(Style.FILL);
    accuracyPaintSurface.setColor(accuracyColor);
    accuracyPaintSurface.setAlpha(0x33);
    accuracyPaintBorder = new Paint();
    accuracyPaintBorder.setStyle(Style.STROKE);
    accuracyPaintBorder.setStrokeWidth(2);
    accuracyPaintBorder.setColor(accuracyColor);
  }

  @Override
  public void draw(Canvas canvas) {
    int x = getBounds().centerX();
    int y = getBounds().centerY();

    if (showAccuracy && accuracy != 0) {
      int pixelAccuracy = getPixelAccuracy();
      canvas.drawCircle(x, y, pixelAccuracy, accuracyPaintSurface);
      canvas.drawCircle(x, y, pixelAccuracy, accuracyPaintBorder);
    }

    Rect savBounds = currentPositionMarker.copyBounds();
    int left = savBounds.left + x;
    int right = savBounds.right + x;
    int top = savBounds.top + y;
    int bottom = savBounds.bottom + y;
    currentPositionMarker.setBounds(left, top, right, bottom);
    currentPositionMarker.draw(canvas);
    // restore
    currentPositionMarker.setBounds(savBounds);
  }

  @Override
  public int getIntrinsicWidth() {
    if (showAccuracy) {
      int pixelAccuracy = getPixelAccuracy();
      return Math
          .max(currentPositionMarker.getIntrinsicWidth(), pixelAccuracy);
    } else {
      return currentPositionMarker.getIntrinsicWidth();
    }
  }

  @Override
  public int getIntrinsicHeight() {
    if (showAccuracy) {
      int pixelAccuracy = getPixelAccuracy();
      return Math.max(currentPositionMarker.getIntrinsicHeight(),
          pixelAccuracy);
    } else {
      return currentPositionMarker.getIntrinsicHeight();
    }
  }

  @Override
  public int getOpacity() {
    return PixelFormat.TRANSPARENT;
  }

  public void setAccuracy(float accuracy) {
    this.accuracy = accuracy;
    if(showAccuracy) {
      setBounds(getIntrinsicWidth() / -2, getIntrinsicHeight() / -2,
        getIntrinsicWidth() / 2, getIntrinsicHeight() / 2);
    }
  }
  
  private int getPixelAccuracy() {
    Projection projection = mapView.getProjection();
    int pixelAccuracy = (int) projection.metersToPixels(accuracy, mapView
        .getMapPosition().getZoomLevel());
    return pixelAccuracy;
  }

  @Override
  public void setAlpha(int alpha) {
    currentPositionMarker.setAlpha(alpha);
  }

  @Override
  public void setColorFilter(ColorFilter cf) {
    currentPositionMarker.setColorFilter(cf);
  }

}

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