Examples of com.vividsolutions.jts.geom.LineSegment

com.vividsolutions.jts.geom.LineSegment
Represents a line segment defined by two {@link Coordinate}s. Provides methods to compute various geometric properties and relationships of line segments.
This class is designed to be easily mutable (to the extent of having its contained points public). This supports a common pattern of reusing a single LineSegment object as a way of computing segment properties on the segments defined by arrays or lists of {@link Coordinate}s. @version 1.7

    
    final Coordinate base = new Coordinate(0d,0d);
    final int n = 100;
    for (int i = 1; i <= n; i++) {
      Edge e = (Edge)generator().add(
        new LineSegment(
          new Coordinate(base.x + (i-1), base.y + (i-1)),
          new Coordinate(base.x + i, base.y + i)
        )
      );  
    }
    
    //complete the circle
    generator().add(
      new LineSegment(new Coordinate(base.x + n, base.y + n), base) 
    );
    
    generator().generate();
    Graph built = generator().getGraph();

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    }


    protected void setUp() throws Exception {
        super.setUp();


        LineSegment ld1 = new LineSegment();
        ld1.setCoordinates(new Coordinate(0, 0), new Coordinate(1, 1));


        LineSegment ld2 = new LineSegment();
        ld2.setCoordinates(new Coordinate(1, 1), new Coordinate(0, 2));


        LineSegment ld3 = new LineSegment();
        ld3.setCoordinates(new Coordinate(1, 1), new Coordinate(1, 0));


        // we have some line segments
        LineSegment[] lines = { ld1, ld2, ld3 };


        // create the graph generator

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                    // doing these checks for any non collinear point is expensive, do it only if there is at least one intersection
                    // or if we're in tolerant mode
                    if(intersectionNum == LineIntersector.POINT_INTERSECTION || (tolerant && intersectionNum != LineIntersector.COLLINEAR)) {
                        // this one might be due to a numerical issue, where the two lines to do intersect
                        // exactly, but almost. Let's compute the distance and see
                        LineSegment segment = new LineSegment(o1, o2);
                        double d1 = segment.distance(c1);
                        double d2 = segment.distance(c2);
                        if(d1 <= PointDistance.EPS_METERS && d2 <= PointDistance.EPS_METERS) {
                            intersectionNum = LineIntersector.COLLINEAR;
                        }
                    }
                    if(intersectionNum == LineIntersector.COLLINEAR) {

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   * 
   * @return null because the actual building of the graph components is delayed
   *         until generate() is called.
   */
  public Graphable add(Object obj) {
    LineSegment line = (LineSegment)obj;
    Integer count;
    
    //increment the count of the in coordinate
    if ((count = (Integer)m_in2count.get(line.p0)) == null) {
      m_in2count.put(line.p0, new Integer(1));

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   * 
   * @return null because the actual building of the graph components is delayed 
   *         until generate() is called.
   */
  public Graphable add(Object obj) {
    LineSegment line = (LineSegment)obj;
    Integer count;
    
    //update count of first coordinate
    if ((count = (Integer)m_coord2count.get(line.p0)) == null) {
      m_coord2count.put(line.p0, new Integer(1));

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   * @return Edge that represents the line.
   * 
   * @see GraphGenerator#get(Object)
   */
  public Graphable get(Object obj) {
    LineSegment line = (LineSegment)obj;
    
    Node n1 = (Node)m_coord2count.get(line.p0);
    Node n2 = (Node)m_coord2count.get(line.p0);
    
    return(n1.getEdge(n2));

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  }
  
  protected void generateEdges() {
    //relate nodes
    for (Iterator itr = m_lines.iterator(); itr.hasNext();) {
      LineSegment line = (LineSegment)itr.next();
      generateEdge(line);
    }
  }

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            //   check for valid comparison
            if(LineString.class.isAssignableFrom(lineGeom.getClass())){
              Coordinate[] c = lineGeom.getCoordinates();
              int i=0;
              while(i+2<c.length){
                LineSegment ls1 = new LineSegment(c[i],c[i+1]);
                LineSegment ls2 = new LineSegment(c[i+1],c[i+2]);
                double a1 = ls1.angle();
                double a2 = ls2.angle();
                if(!((a1-degreesAllowable)<a1 && (a1+degreesAllowable)>a2)){
                  results.error(line,"Atleast one node was too close to the other the perpendicular line between the node's two neighbours.");
              i = c.length;
                }
              }

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   * 
   * @see LineSegment
   * @see GraphGenerator#add(Object)
   */
  public Graphable add(Object obj) {
    LineSegment line = (LineSegment)obj;
    Coordinate first,last;
    Node n1, n2;
    
    //check first coordinate
    first = line.p0;

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  protected LineSegment alterLine(LineSegment line, Node n1, Node n2) {
    Coordinate c1added = ((Coordinate) n1.getObject());
    Coordinate c2added = ((Coordinate) n2.getObject());
      if (!c1added.equals2D(line.p0) || c2added.equals2D(line.p1)) {
        return new LineSegment(c1added,c2added);
      }
      return line;
  }

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