Module ij
Package ij.process

Class FloatPolygon

  • public class FloatPolygon
extends java.lang.Object
    Used by the Roi classes to return float coordinate arrays and to determine if a point is inside or outside of spline fitted selections.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      int npoints
      The number of points.
      float[] xpoints  
      float[] ypoints  

    • Constructor Summary

      Constructors 
      Constructor Description
      FloatPolygon()
      Constructs an empty FloatPolygon.
      FloatPolygon​(float[] xpoints, float[] ypoints)
      Constructs a FloatPolygon from x and y arrays.
      FloatPolygon​(float[] xpoints, float[] ypoints, int npoints)
      Constructs a FloatPolygon from x and y arrays.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void addPoint​(double x, double y)  
      void addPoint​(float x, float y)  
      boolean contains​(double x, double y)
      Returns 'true' if the point (x,y) is inside this polygon.
      boolean contains​(float x, float y)
      A version of contains() that accepts float arguments.
      FloatPolygon duplicate()  
      java.awt.Rectangle getBounds()  
      FloatPolygon getConvexHull()
      Uses the gift wrap algorithm to find the convex hull of all points in this FloatPolygon and returns it as a new FloatPolygon.
      java.awt.geom.Rectangle2D.Double getFloatBounds()  
      double getLength​(boolean isLine)  
      java.lang.String toString()  
      void translate​(double x, double y)  

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

    • Field Detail

      • npoints

        public int npoints
        The number of points.

      • xpoints

        public float[] xpoints

      • ypoints

        public float[] ypoints

    • Constructor Detail

      • FloatPolygon

        public FloatPolygon()
        Constructs an empty FloatPolygon.

      • FloatPolygon

        public FloatPolygon​(float[] xpoints,
                    float[] ypoints)
        Constructs a FloatPolygon from x and y arrays.

      • FloatPolygon

        public FloatPolygon​(float[] xpoints,
                    float[] ypoints,
                    int npoints)
        Constructs a FloatPolygon from x and y arrays.

    • Method Detail

      • contains

        public boolean contains​(double x,
                        double y)
        Returns 'true' if the point (x,y) is inside this polygon. This is a Java version of the remarkably small C program by W. Randolph Franklin at http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html#The%20C%20Code In the absence of numerical errors, x coordinates exactly at a boundary are taken as if in the area immediately at the left of the boundary. For horizontal boundaries, y coordinates exactly at the border are taken as if in the area immediately above it (i.e., in decreasing y direction). The ImageJ convention of an offset of 0.5 pixels between pixel centers and outline coordinates is not taken into consideration; this method returns the purely geometrical relationship.

      • contains

        public boolean contains​(float x,
                        float y)
        A version of contains() that accepts float arguments.

      • getBounds

        public java.awt.Rectangle getBounds()

      • getFloatBounds

        public java.awt.geom.Rectangle2D.Double getFloatBounds()

      • addPoint

        public void addPoint​(float x,
                     float y)

      • addPoint

        public void addPoint​(double x,
                     double y)

      • getLength

        public double getLength​(boolean isLine)

      • getConvexHull

        public FloatPolygon getConvexHull()
        Uses the gift wrap algorithm to find the convex hull of all points in this FloatPolygon and returns it as a new FloatPolygon. The sequence of the points on the convex hull is counterclockwise.

      • translate

        public void translate​(double x,
                      double y)

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object