Package ij.process

Class PolygonFiller

java.lang.Object
ij.process.PolygonFiller
public class PolygonFiller
extends Object
This class fills polygons using the scan-line filling algorithm described at "http://www.cs.rit.edu/~icss571/filling/". Note that by ImageJ convention, outline and pixel coordinates are shifted by 0.5: Pixel (0,0) is enclosed by the rectangle between (0,0) and (1,1); thus all 0.5 is added to all polygon coordinates when comparing to pixel coordinates. After applying this offset, rounding is done such that points exactly on the left boundary are considered outside, points exactly on the right boundary inside. Points exactly on a horizontal boundary are considered ouside for the boundary with lower y and inside for the boundary with the higher y. (actually, the boundary is slightly shifted to the left (in x) to ensure correct rounding in spite of the final numeric accuracy)

  • Constructor Summary

    Constructors 
    Constructor Description
    PolygonFiller()
    Constructs a PolygonFiller.
    PolygonFiller​(float[] xf, float[] yf, int n, float xOffset, float yOffset)
    Constructs a PolygonFiller using the specified polygon with floating-point coordinates.
    PolygonFiller​(int[] x, int[] y, int n)
    Constructs a PolygonFiller using the specified polygon with integer coordinates.

  • Method Summary

    Modifier and Type Method Description
    void fill​(ImageProcessor ip, Rectangle r)
    Fills the polygon using the ImageProcessor's current drawing color.
    ImageProcessor getMask​(int width, int height)
    Returns a byte mask containing a filled version of the polygon.
    void setPolygon​(float[] xf, float[] yf, int n, float xOffset, float yOffset)
    Specifies the polygon to be filled in case of float coordinates.
    void setPolygon​(int[] x, int[] y, int n)
    Specifies the polygon to be filled.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • PolygonFiller

      public PolygonFiller()
      Constructs a PolygonFiller.

    • PolygonFiller

      public PolygonFiller​(int[] x, int[] y, int n)
      Constructs a PolygonFiller using the specified polygon with integer coordinates.

    • PolygonFiller

      public PolygonFiller​(float[] xf, float[] yf, int n, float xOffset, float yOffset)
      Constructs a PolygonFiller using the specified polygon with floating-point coordinates.

  • Method Details

    • setPolygon

      public void setPolygon​(int[] x, int[] y, int n)
      Specifies the polygon to be filled.

    • setPolygon

      public void setPolygon​(float[] xf, float[] yf, int n, float xOffset, float yOffset)
      Specifies the polygon to be filled in case of float coordinates. In this case, multiple polygons separated by one set of NaN coordinates each.

    • fill

      public void fill​(ImageProcessor ip, Rectangle r)
      Fills the polygon using the ImageProcessor's current drawing color.

    • getMask

      public ImageProcessor getMask​(int width, int height)
      Returns a byte mask containing a filled version of the polygon.