PolyshapeWriter Class Reference

Wrap the 'Encoded Polyline Algorithm Format' defined in: Google Maps API with flags to encode various Shapes: Point, Line, Polygon, etc. More...

Inheritance diagram for PolyshapeWriter:

Collaboration diagram for PolyshapeWriter:

Classes
class	Encoder
	Encodes a sequence of LatLngs into an encoded path string. More...

Public Member Functions
String	getFormatName ()
void	write (Writer output, Geometry shape) throws IOException
void	write (Encoder enc, Geometry shape) throws IOException
String	toString (Geometry shape)

Static Public Attributes
static final char	KEY_POINT = '0'
static final char	KEY_LINE = '1'
static final char	KEY_POLYGON = '2'
static final char	KEY_MULTIPOINT = '3'
static final char	KEY_CIRCLE = '4'
static final char	KEY_BOX = '5'
static final char	KEY_ARG_START = '('
static final char	KEY_ARG_END = ')'
static final char	KEY_SEPERATOR = ' '

Detailed Description

Wrap the 'Encoded Polyline Algorithm Format' defined in: Google Maps API with flags to encode various Shapes: Point, Line, Polygon, etc.

For more details, see FORMATS.md

This format works well for geographic shapes (-180...+180 / -90...+90), but is not appropriate for other coordinate systems

See also

Google Maps API

PolyshapeReader

Member Function Documentation

getFormatName()

String getFormatName

(

)

                                {
    return "PolyShape";
  }

toString()

String toString

(

Geometry

shape

)

References PolyshapeWriter.write().

Referenced by PolyshapeDatatype.unparse().

                                         {
    try {
      StringWriter buffer = new StringWriter();
      write(buffer, shape);
      return buffer.toString();
    } catch (IOException ex) {
      throw new RuntimeException(ex);
    }
  }

write() [1/2]

void write	(	Writer	output,
		Geometry	shape
	)		throws IOException

Referenced by PolyshapeWriter.toString().

                                                                      {
    if (shape == null) {
      throw new NullPointerException("Shape can not be null");
    }
    write(new Encoder(output), shape);
  }

write() [2/2]

void write	(	Encoder	enc,
		Geometry	shape
	)		throws IOException

                                                                    {
    /*if (shape instanceof Point) {
      Point v = (Point) shape;
      enc.write(KEY_POINT);
      enc.write(v.getX(), v.getY());
      return;
    }
    if (shape instanceof Rectangle2D) {
      Rectangle v = (Rectangle) shape;
      enc.write(KEY_BOX);
      enc.write(v.getMinX(), v.getMinY());
      enc.write(v.getMaxX(), v.getMaxY());
      return;
    }
    if (shape instanceof BufferedLine) {
      BufferedLine v = (BufferedLine) shape;
      enc.write(KEY_LINE);
      if(v.getBuf()>0) {
        enc.writeArg(v.getBuf());
      }
      enc.write(v.getA().getX(), v.getA().getY());
      enc.write(v.getB().getX(), v.getB().getY());
      return;
    }
    if (shape instanceof LineString) {
      LineString v = (LineString) shape;
      enc.write(KEY_LINE);
      if(v.getBuf()>0) {
        enc.writeArg(v.getBuf());
      }
      LineString last = null;
      Iterator<LineString> iter = v.getSegments().iterator();
      while (iter.hasNext()) {
        LineString seg = iter.next();
        enc.write(seg.getA().getX(), seg.getA().getY());
        last = seg;
      }
      if (last != null) {
        enc.write(last.getB().getX(), last.getB().getY());
      }
      return;
    }
    if (shape instanceof Circle) {
      // See: https://github.com/geojson/geojson-spec/wiki/Proposal---Circles-and-Ellipses-Geoms
      Circle v = (Circle) shape;
      Point center = GeometryFactory. createPointFromInternalCoord(v.getCenter().getCoordinate(), new GeometryFactory());
      double radius = v.getRadius();
      enc.write(KEY_CIRCLE);
      enc.writeArg(radius);
      enc.write(center.getX(), center.getY());
      return;
    }
    if (shape instanceof GeometryCollection) {
      GeometryCollection v = (GeometryCollection) shape;
      
      //Iterator<Geometry> iter = v.geomeiterator();
      for(int i=0;i<v.getLength();i++) {
        write(enc, v.getGeometryN(i));
        if(i<v.getLength()) {
          enc.seperator();
        }
      }
      return;
    }*/
    return;
    
  }

Member Data Documentation

KEY_ARG_END

final char KEY_ARG_END = ')'

static

Referenced by PolyshapeReader.read().

KEY_ARG_START

final char KEY_ARG_START = '('

static

Referenced by PolyshapeReader.read().

KEY_BOX

final char KEY_BOX = '5'

static

KEY_CIRCLE

final char KEY_CIRCLE = '4'

static

Referenced by PolyshapeReader.read().

KEY_LINE

final char KEY_LINE = '1'

static

Referenced by PolyshapeReader.read(), and JtsPolyshapeWriter.write().

KEY_MULTIPOINT

final char KEY_MULTIPOINT = '3'

static

Referenced by PolyshapeReader.read(), and JtsPolyshapeWriter.write().

KEY_POINT

final char KEY_POINT = '0'

static

Referenced by PolyshapeReader.read(), and JtsPolyshapeWriter.write().

KEY_POLYGON

final char KEY_POLYGON = '2'

static

Referenced by PolyshapeReader.read(), and JtsPolyshapeWriter.write().

KEY_SEPERATOR

final char KEY_SEPERATOR = ' '

static

Referenced by PolyshapeReader.read().