This interface provides operations on objects of type Path.T and of type R2Path.T. A Path.T is the path represented on an integer grid, a R2Path.T is a path represented by coordinates which are reals.

INTERFACE R2PathExtra;

IMPORT Point, MG, Path, R2Path, Rect, Matrix2D;

PROCEDURE TranslatePath (READONLY path: Path.T; READONLY delta: Point.T):
  Path.T;

Return path translated by delta.

PROCEDURE R2PathToPath (         v       : MG.V;
                          READONLY R2Path: R2Path.T;
                          READONLY matrix := Matrix2D.Identity): Path.T;

Convert R2Path to the equivalent Path.T on an integer grid transformed by matrix.

TYPE
  Element = RECORD
              pt: Point.T;
              steps: INTEGER;
            END;

  SubPath = RECORD
              start: Point.T;
              elems: REF ARRAY OF Element := NIL;
              closed: BOOLEAN;
            END;

  Segments <: PublicSegments;
  PublicSegments = OBJECT subPaths: REF ARRAY OF SubPath := NIL;  END;

PROCEDURE PathToSegments (v: MG.V; READONLY path: Path.T): Segments;

Convert path to the corresponding Segment structure.

PROCEDURE PathBounds (READONLY path: Path.T): Rect.T;

Return the integer bounds of path.

END R2PathExtra.