PolyshapeWriter.Encoder Class Reference

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

Collaboration diagram for PolyshapeWriter.Encoder:

Public Member Functions
	Encoder (Writer writer)
void	seperator () throws IOException
void	startRing () throws IOException
void	write (char event) throws IOException
void	writeArg (double value) throws IOException
void	write (double latitude, double longitude) throws IOException

Package Attributes
long	lastLat = 0
long	lastLng = 0
final Writer	writer

Private Member Functions
void	encode (long v) throws IOException

Detailed Description

Encodes a sequence of LatLngs into an encoded path string.

from Apache 2.0 licensed: https://github.com/googlemaps/android-maps-utils/blob/master/library/src/com/google/maps/android/PolyUtil.java

Constructor & Destructor Documentation

Encoder()

Encoder

(

Writer

writer

)

References PolyshapeWriter.Encoder.writer.

                                  {
      this.writer = writer;
    }

Member Function Documentation

encode()

void encode ( long  v ) throws IOException

private

Referenced by PolyshapeWriter.Encoder.write(), and PolyshapeWriter.Encoder.writeArg().

                                                   {
      v = v < 0 ? ~(v << 1) : v << 1;
      while (v >= 0x20) {
        writer.write(Character.toChars((int) ((0x20 | (v & 0x1f)) + 63)));
        v >>= 5;
      }
      writer.write(Character.toChars((int) (v + 63)));
    }

seperator()

void seperator

(

)

throws IOException

                                               {
      writer.write(KEY_SEPERATOR);
      lastLat = lastLng = 0;
    }

startRing()

void startRing

(

)

throws IOException

                                               {
      writer.write(KEY_ARG_START);
      lastLat = lastLng = 0;
    }

write() [1/2]

void write

(

char

event

)

throws IOException

                                                     {
      writer.write(event);
      lastLat = lastLng = 0;
    }

write() [2/2]

void write	(	double	latitude,
		double	longitude
	)		throws IOException

References PolyshapeWriter.Encoder.encode(), PolyshapeWriter.Encoder.lastLat, and PolyshapeWriter.Encoder.lastLng.

                                                                            {

      long lat = Math.round(latitude * 1e5);
      long lng = Math.round(longitude * 1e5);

      long dLat = lat - lastLat;
      long dLng = lng - lastLng;

      encode(dLat);
      encode(dLng);

      lastLat = lat;
      lastLng = lng;
    }

writeArg()

void writeArg

(

double

value

)

throws IOException

References PolyshapeWriter.Encoder.encode().

                                                          {
      writer.write(KEY_ARG_START);
      encode(Math.round(value * 1e5));
      writer.write(KEY_ARG_END);
    }

Member Data Documentation

lastLat

long lastLat = 0

package

Referenced by PolyshapeWriter.Encoder.write().

lastLng

long lastLng = 0

package

Referenced by PolyshapeWriter.Encoder.write().

writer

final Writer writer

package

Referenced by PolyshapeWriter.Encoder.Encoder().