Class SimpleSnapRounder

  • All Implemented Interfaces:
    Noder

    public class SimpleSnapRounder
    extends java.lang.Object
    implements Noder
    Uses Snap Rounding to compute a rounded, fully noded arrangement from a set of SegmentStrings. Implements the Snap Rounding technique described in the papers by Hobby, Guibas & Marimont, and Goodrich et al. Snap Rounding assumes that all vertices lie on a uniform grid; hence the precision model of the input must be fixed precision, and all the input vertices must be rounded to that precision.

    This implementation uses simple iteration over the line segments. This is not the most efficient approach for large sets of segments.

    This implementation appears to be fully robust using an integer precision model. It will function with non-integer precision models, but the results are not 100% guaranteed to be correctly noded.

    Version:
    1.7
    • Constructor Detail

    • Method Detail

      • getNodedSubstrings

        public java.util.Collection getNodedSubstrings()
        Description copied from interface: Noder
        Returns a Collection of fully noded SegmentStrings. The SegmentStrings have the same context as their parent.
        Specified by:
        getNodedSubstrings in interface Noder
        Returns:
        a Collection of NodedSegmentStrings representing the substrings
      • computeNodes

        public void computeNodes​(java.util.Collection inputSegmentStrings)
        Description copied from interface: Noder
        Computes the noding for a collection of SegmentStrings. Some Noders may add all these nodes to the input SegmentStrings; others may only add some or none at all.
        Specified by:
        computeNodes in interface Noder
        Parameters:
        inputSegmentStrings - a Collection of NodedSegmentStrings
      • computeVertexSnaps

        public void computeVertexSnaps​(java.util.Collection edges)
        Computes nodes introduced as a result of snapping segments to vertices of other segments
        Parameters:
        edges - the list of segment strings to snap together