ShapePolyLineM.java

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 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2016 by Pentaho : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
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package org.pentaho.gis.shapefiles;

/*
 * Created on 13-mei-04
 *
 * @author Matt
 *
 */

public class ShapePolyLineM extends Shape implements ShapeInterface {
  public int nrparts;
  public int nrpoints;
  public int nrmeasures;

  public double box_minx, box_miny, box_maxx, box_maxy;
  public int[] part_starts;
  public ShapePoint[] point;

  public double mmin, mmax;
  public double[] measures;

  /*
                                                              Byte
    Position       Field       Value      Type     Number     Order
    ----------------------------------------------------------------
    Byte 0         Shape Type  23         Integer  1          Little
    Byte 4         Box         Box        Double   4          Little
    Byte 36        NumParts    NumParts   Integer  1          Little
    Byte 40        NumPoints   NumPoints  Integer  1          Little
    Byte 44        Parts       Parts      Integer  NumParts   Little
    Byte X         Points      Points     Point    NumPoints  Little
    Byte Y*        Mmin        Mmin       Double   1          Little
    Byte Y + 8*    Mmax        Mmax       Double   1          Little
    Byte Y + 16*   Marray      Marray     Double   NumPoints  Little

    Note: X = 44 + (4 * NumParts), Y = X + (16 * NumPoints)
    * optional
  **/

  public ShapePolyLineM( byte[] content ) {
    super( Shape.SHAPE_TYPE_POLYLINE_M );

    int pos;

    box_minx = Converter.getDoubleLittle( content, 4 );
    box_miny = Converter.getDoubleLittle( content, 12 );
    box_maxx = Converter.getDoubleLittle( content, 20 );
    box_maxy = Converter.getDoubleLittle( content, 28 );

    nrparts = Converter.getIntegerLittle( content, 36 );
    nrpoints = Converter.getIntegerLittle( content, 40 );

    int pos_parts = 44;
    int pos_points = pos_parts + ( nrparts * 4 );
    int pos_mmin = pos_points + ( 16 * nrpoints );
    int pos_mmax = pos_mmin + 8;
    int pos_marray = pos_mmax + 16;
    int tot_length = pos_marray + ( 8 * nrpoints );

    //System.out.println("\n\nlength="+content.length+", nrparts="+nrparts+", nrpoints="+nrpoints+", pos_marray="+pos_marray+", totlen="+tot_length);

    part_starts = new int[nrparts];
    point = new ShapePoint[nrpoints];
    measures = null;

    // Determine the starting point for the parts...
    for ( int i = 0; i < nrparts; i++ ) {
      pos = 44 + i * 4;
      part_starts[i] = Converter.getIntegerLittle( content, pos );

      //System.out.println("part_starts["+i+"] = "+part_starts[i]);
    }

    for ( int i = 0; i < nrpoints; i++ ) {
      pos = ( 44 + nrparts * 4 ) + ( 16 * i );
      double pointx = Converter.getDoubleLittle( content, pos );
      double pointy = Converter.getDoubleLittle( content, pos + 8 );
      point[i] = new ShapePoint( pointx, pointy );

      // System.out.println("point["+i+"] = "+points[i].toString());
    }

    // Optional part!
    if ( tot_length == content.length + 8 ) {
      pos = ( 44 + nrparts * 4 ) + ( 16 * nrpoints );

      mmin = Converter.getDoubleLittle( content, pos );
      mmax = Converter.getDoubleLittle( content, pos + 8 );
      measures = new double[nrpoints < 0 ? 0 : nrpoints];
      for ( int i = 0; i < nrpoints; i++ ) {
        measures[i] = Converter.getDoubleLittle( content, pos + 16 + i * 8 );
        // System.out.println("measures["+i+"] = "+measures[i]);
      }
    }
  }

  public boolean contains( ShapePoint p ) {
    for ( int i = 0; i < nrpoints; i++ ) {
      if ( p.equals( point[i] ) ) {
        return true;
      }
    }
    return false;
  }
}