Android Open Source - elf.map.android Map View

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License

The source code is released under:

This is free and unencumbered software released into the public domain. Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a co...

Java Source Code

/*
 * License: Public Domain/*from   w w w . ja  v  a2  s  .c  om*/
 * Author: elf
 * EMail: elf198012@gmail.com
 */

package elf.map;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.Bitmap;
import android.graphics.PointF;
import android.graphics.RectF;
import android.view.View;

public class MapView extends View{
  private int _nLevel = 0;
  private MapPainter _mpMapPainter;
  private Bitmap _bmpMap;

  private Paint _paint;

  private PointF _ptfGps = new PointF();
  private Point _ptGps = new Point();
  private List<Point> _gpsTrace = new ArrayList<Point>();

  private Point _ptLocationCenter = new Point();
  private Size _szMapMargin = new Size();

  private int _nWidth;
  private int _nHeight;
  private android.graphics.Rect _rtSrc = new android.graphics.Rect();
  private RectF _rtfDest = new RectF();


  public MapView(Context context, MapPainter painter) {
    super(context);
    _mpMapPainter = painter;

    _paint = new Paint();
    _paint.setAntiAlias(true);
    _paint.setTextSize(20.0f);
    _paint.setTextAlign(Align.CENTER);

    for(int i = 0, n = _szVisibleTypes.length; i < n; ++i)
      _szVisibleTypes[i] = true;
  }

  public void SetGps(float fLongitude, float fLatitude){
    if(fLongitude == _ptfGps.x && fLatitude == _ptfGps.y)
      return;

    long nLongitude = Map.LongitudeFloatToLong(fLongitude);
    long nLatitude = Map.LatitudeFloatToLong(fLatitude);


    _ptfGps.set(fLongitude, fLatitude);
    _ptGps.Set(nLongitude, nLatitude);

    if(_gpsTrace.size() >= 1000)
      _gpsTrace.remove(0);

    _gpsTrace.add(new Point(nLongitude, nLatitude));
  }

  private void _Home(){
    _ptLocationCenter.Set(_ptGps);
  }

  public void Home(){
    _Home();

    if(_bmpMap != null){
      _Redraw();
      invalidate();
    }
  }

  private void resetSourceRect(){
    _rtSrc.set((int)_szMapMargin.Width(), (int)_szMapMargin.Height(), (int)_szMapMargin.Width() + _nWidth, (int)_szMapMargin.Height() + _nHeight);
  }

  private void _SetCenter(float fLongitude, float fLatitude){
    long nLongitude = Map.LongitudeFloatToLong(fLongitude);
    long nLatitude = Map.LatitudeFloatToLong(fLatitude);

    _ptLocationCenter.Set(nLongitude, nLatitude);
  }

  public void SetCenter(Point ptCenter){
    _ptLocationCenter.Set(ptCenter);

    if(_bmpMap != null){
      _Redraw();
      invalidate();
    }
  }

  public void SetCenter(float fLongitude, float fLatitude){
    _SetCenter(fLongitude, fLatitude);
    if(_bmpMap != null){
      _Redraw();
      invalidate();
    }
  }

  public void PixelOffset(int nX, int nY){
    if(_bmpMap == null)
      return;

    long nLongitudeOffset = _mpMapPainter.PixelToLocationLong(nX);
    long nLatitudeOffset = _mpMapPainter.PixelToLocationLong(nY);
    long nNewLongitude = _ptLocationCenter.X() + nLongitudeOffset;
    long nNewLatitude = _ptLocationCenter.Y() + nLatitudeOffset;

    if(nNewLongitude < 0 || nNewLongitude >= 4294967296L || nNewLatitude < 0 || nNewLatitude >= 2147483648L)
      return;

    _ptLocationCenter.Set(nNewLongitude, nNewLatitude);
    _rtSrc.offset(nX, nY);

    if((_rtSrc.left < 0 || _rtSrc.top < 0 || _rtSrc.right > _nBmpSize || _rtSrc.bottom > _nBmpSize)){
      _Redraw();
    }

    invalidate();
  }

  public void SetLevel(int nLevel){
    _nLevel = nLevel;

    if(_bmpMap != null){
      _Redraw();
      invalidate();
    }
  }

  public void DecreaseLevel(){
    --_nLevel;

    if(_bmpMap != null){
      _Redraw();
      invalidate();
    }
  }

  public void IncreaseLevel(){
    ++_nLevel;

    if(_bmpMap != null){
      _Redraw();
      invalidate();
    }
  }

  private boolean[] _szVisibleTypes = new boolean[5];

  public boolean[] GetVisibleTypes(){
    return _szVisibleTypes;
  }

  public void SetVisibleType(Map.ObjectType type, boolean bVisible){
    _szVisibleTypes[type.ordinal()] = bVisible;
  }

  public void Redraw(){
    _Redraw();
    invalidate();
  }

  private void _Redraw(){
    resetSourceRect();
    Canvas canvas = new Canvas(_bmpMap);
    _nLevel = _mpMapPainter.Begin(canvas, _ptLocationCenter, _nLevel);
    _mpMapPainter.DrawBackground();

    if(_szVisibleTypes[Map.ObjectType.Area.ordinal()])
      _mpMapPainter.DrawAreas();

    if(_szVisibleTypes[Map.ObjectType.Water.ordinal()])
      _mpMapPainter.DrawWaters();

    if(_szVisibleTypes[Map.ObjectType.WaterWay.ordinal()])
      _mpMapPainter.DrawWaterWays();

    if(_szVisibleTypes[Map.ObjectType.Way.ordinal()])
      _mpMapPainter.DrawLines();

    if(_szVisibleTypes[Map.ObjectType.Location.ordinal()])
      _mpMapPainter.DrawLocations();

    if(_szVisibleTypes[Map.ObjectType.Area.ordinal()])
      _mpMapPainter.DrawNameOfAreas();

    if(_szVisibleTypes[Map.ObjectType.WaterWay.ordinal()])
      _mpMapPainter.DrawNameOfWaterWays();

    if(_szVisibleTypes[Map.ObjectType.Water.ordinal()])
      _mpMapPainter.DrawNameOfWaters();

    if(_szVisibleTypes[Map.ObjectType.Way.ordinal()])
      _mpMapPainter.DrawNameOfWays();

    _paint.setColor(Color.BLUE);
    _mpMapPainter.DrawOval(_ptGps, 5.0f, 5.0f, _paint);

    _paint.setColor(Color.RED);
    _mpMapPainter.DrawText(_ptGps, String.valueOf(_ptfGps.x) + ", " + String.valueOf(_ptfGps.y), _paint);

    _mpMapPainter.End();
  }

  @Override
  protected void onDraw(Canvas canvas) {
    //    if(_bmpMap != null)
    //    canvas.drawColor(0xFF808080);
    canvas.drawBitmap(_bmpMap, _rtSrc, _rtfDest, _paint);
    //    _paint.setColor(Color.RED);
    //    canvas.drawText(String.valueOf(_nLevel), 100, 100, _paint);

    //    canvas.drawText(String.valueOf(_rtSrc.left) + ", " + String.valueOf(_rtSrc.top) + ", " + String.valueOf(_rtSrc.width()) + ", " + String.valueOf(_rtSrc.height()), 320, 20, _textPaint);
    //    canvas.drawText(String.valueOf(_rtfDest.left) + ", " + String.valueOf(_rtfDest.top) + ", " + String.valueOf(_rtfDest.width()) + ", " + String.valueOf(_rtfDest.height()), 320, 60, _textPaint);

  }

  private int _nBmpSize;
  private int _nBmpOneQuarterSize;

  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    // TODO Auto-generated method stub
    super.onSizeChanged(w, h, oldw, oldh);
    _nWidth = w;
    _nHeight = h;

    _rtSrc.right = _rtSrc.left + w;
    _rtSrc.bottom = _rtSrc.top + h;
    _rtfDest.right = w;
    _rtfDest.bottom = h;


    int nBmpHalfSize = (w > h? w : h);
    _nBmpSize = nBmpHalfSize << 1;
    _nBmpOneQuarterSize = nBmpHalfSize >> 1;

    _szMapMargin.Set(_nBmpOneQuarterSize + ((nBmpHalfSize - w) >> 1), _nBmpOneQuarterSize + ((nBmpHalfSize - h) >> 1));

    if(_bmpMap != null)
      _bmpMap.recycle();


    _bmpMap = Bitmap.createBitmap(_nBmpSize, _nBmpSize,  Bitmap.Config.RGB_565);

    _Redraw();
  }
}

Java Source Code List

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