Examples of java.awt.geom.PathIterator

java.awt.geom.PathIterator
The PathIterator interface provides the mechanism for objects that implement the {@link java.awt.Shape Shape}interface to return the geometry of their boundary by allowing a caller to retrieve the path of that boundary a segment at a time. This interface allows these objects to retrieve the path of their boundary a segment at a time by using 1st through 3rd order Bézier curves, which are lines and quadratic or cubic Bézier splines.
Multiple subpaths can be expressed by using a "MOVETO" segment to create a discontinuity in the geometry to move from the end of one subpath to the beginning of the next.
Each subpath can be closed manually by ending the last segment in the subpath on the same coordinate as the beginning "MOVETO" segment for that subpath or by using a "CLOSE" segment to append a line segment from the last point back to the first. Be aware that manually closing an outline as opposed to using a "CLOSE" segment to close the path might result in different line style decorations being used at the end points of the subpath. For example, the {@link java.awt.BasicStroke BasicStroke} object uses a line "JOIN" decoration to connect the first and last points if a "CLOSE" segment is encountered, whereas simply ending the path on the same coordinate as the beginning coordinate results in line "CAP" decorations being used at the ends. @see java.awt.Shape @see java.awt.BasicStroke @version 1.17, 11/17/05 @author Jim Graham

   */
  public void test(TestHarness harness)       
  {
    double[] c = new double[6];
    Arc2D arc1 = new Arc2D.Double(1.0, 2.0, 3.0, 4.0, 0.0, 90.0, Arc2D.PIE);
    PathIterator iterator = arc1.getPathIterator(null);
    harness.check(!iterator.isDone());
    int segType = iterator.currentSegment(c);
    harness.check(segType == PathIterator.SEG_MOVETO);
    harness.check(c[0], 4.0);
    harness.check(c[1], 4.0);
    harness.check(!iterator.isDone());
    iterator.next();
    segType = iterator.currentSegment(c);
    harness.check(segType == PathIterator.SEG_CUBICTO);
    harness.check(c[0], 4.0);
    harness.check(c[1], 2.8954305003384135);
    harness.check(c[2], 3.3284271247461903);
    harness.check(c[3], 2.0);
    harness.check(c[4], 2.5);
    harness.check(c[5], 2.0);
    iterator.next();
    segType = iterator.currentSegment(c);
    harness.check(segType == PathIterator.SEG_LINETO);
    harness.check(c[0], 2.5);
    harness.check(c[1], 4.0);
    iterator.next();
    segType = iterator.currentSegment(c);
    harness.check(segType == PathIterator.SEG_CLOSE);
    iterator.next();
    harness.check(iterator.isDone());
  }

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   */
  public void testShapeArgConstructor(TestHarness harness)
  {
    java.awt.geom.GeneralPath path;
    Throwable caught;
    PathIterator piter;
    double[] c = new double[6];


    harness.checkPoint("GeneralPath(Shape)");


    // Check 1
    caught = null;
    try
    {
      path = new java.awt.geom.GeneralPath(null);
    }
    catch (Exception ex)
    {
      caught = ex;
    }
    harness.check(caught instanceof NullPointerException);


    // Check 2 to 4
    path = new java.awt.geom.GeneralPath(new Rectangle2D.Double(10,20,30,40));
    piter = path.getPathIterator(null);
    harness.check(piter.currentSegment(c), PathIterator.SEG_MOVETO);
    harness.check(c[0], 10.0);
    harness.check(c[1], 20.0);


    // Check 5 to 7
    piter.next();
    harness.check(piter.currentSegment(c), PathIterator.SEG_LINETO);
    harness.check(c[0], 40.0);
    harness.check(c[1], 20.0);


    // Check 8 to 10
    piter.next();
    harness.check(piter.currentSegment(c), PathIterator.SEG_LINETO);
    harness.check(c[0], 40.0);
    harness.check(c[1], 60.0);


    // Check 11 to 13
    piter.next();
    harness.check(piter.currentSegment(c), PathIterator.SEG_LINETO);
    harness.check(c[0], 10.0);
    harness.check(c[1], 60.0);


    // Check 14 to 16
    piter.next();
    harness.check(piter.currentSegment(c), PathIterator.SEG_LINETO);
    harness.check(c[0], 10.0);
    harness.check(c[1], 20.0);


    // Check 17
    piter.next();
    harness.check(piter.currentSegment(c), PathIterator.SEG_CLOSE);


    // Check 18
    piter.next();
    harness.check(piter.isDone());


    // Check 19
    harness.check(piter.getWindingRule(), PathIterator.WIND_NON_ZERO);
  }

View Full Code Here

   */
  public void test_notConnecting(TestHarness harness)
  {
    harness.checkPoint("notConnecting");


    PathIterator piter, resPiter;
    GeneralPath path;
    double[] c = new double[6];


    piter = new PathIterator()
    {
      int i = 0;


      public int getWindingRule()
      {
        return PathIterator.WIND_EVEN_ODD;
      }


      public boolean isDone()
      {
        // System.out.println("isDone(), i=" + i);
        return i >= 7;
      }


      public void next()
      {
        ++i;
      }


      public int currentSegment(float[] c)
      {
        double[] d = new double[c.length];
        int r = currentSegment(d);
        for (int i = 0; i < d.length; i++)
          c[i] = (float) d[i];
        return r;
      }


      public int currentSegment(double[] c)
      {
        switch (i)
        {
        case 0:
          c[0] = 10; c[1] = 11;
          return PathIterator.SEG_MOVETO;


        case 1:
          c[0] = 20; c[1] = 21;
          return PathIterator.SEG_LINETO;


        case 2:
          c[0] = 30; c[1] = 31; c[2] = 32; c[3] = 33;
          return PathIterator.SEG_QUADTO;


        case 3:
          c[0] = 40; c[1] = 41; c[2] = 42; c[3] = 43;
          c[4] = 44; c[5] = 45;
          return PathIterator.SEG_CUBICTO;


        case 4:
          return PathIterator.SEG_CLOSE;


        case 5:
          c[0] = 50; c[1] = 51;
          return PathIterator.SEG_MOVETO;


        case 6:
          c[0] = 60; c[1] = 61;
          return PathIterator.SEG_LINETO;


        default:
          throw new IllegalPathStateException();
        }
      }
    };




    path = new GeneralPath(GeneralPath.WIND_NON_ZERO);
    path.append(piter, false);
    
    harness.check(path.getWindingRule(),      // 1
                  GeneralPath.WIND_NON_ZERO);


    resPiter = path.getPathIterator(null);
    harness.check(!resPiter.isDone());        // 2


    harness.check(resPiter.currentSegment(c), // 3
                  PathIterator.SEG_MOVETO);
    harness.check(c[0], 10);                  // 4
    harness.check(c[1], 11);                  // 5


    resPiter.next();
    harness.check(!resPiter.isDone());        // 6
    harness.check(resPiter.currentSegment(c), // 7
                  PathIterator.SEG_LINETO);
    harness.check(c[0], 20);                  // 8
    harness.check(c[1], 21);                  // 9


    resPiter.next();
    harness.check(!resPiter.isDone());        // 10
    harness.check(resPiter.currentSegment(c),
                  PathIterator.SEG_QUADTO);   // 11
    harness.check(c[0], 30);                  // 12
    harness.check(c[1], 31);                  // 13
    harness.check(c[2], 32);                  // 14
    harness.check(c[3], 33);                  // 15


    resPiter.next();
    harness.check(!resPiter.isDone());        // 16
    harness.check(resPiter.currentSegment(c),
                  PathIterator.SEG_CUBICTO);  // 17
    harness.check(c[0], 40);                  // 18
    harness.check(c[1], 41);                  // 19
    harness.check(c[2], 42);                  // 20
    harness.check(c[3], 43);                  // 21
    harness.check(c[4], 44);                  // 22
    harness.check(c[5], 45);                  // 23


    resPiter.next();
    harness.check(!resPiter.isDone());        // 24
    harness.check(resPiter.currentSegment(c), // 25
                  PathIterator.SEG_CLOSE);


    resPiter.next();
    harness.check(!resPiter.isDone());        // 26
    harness.check(resPiter.currentSegment(c), // 27
                  PathIterator.SEG_MOVETO);
    harness.check(c[0], 50);                  // 28
    harness.check(c[1], 51);                  // 29


    resPiter.next();
    harness.check(!resPiter.isDone());        // 30
    harness.check(resPiter.currentSegment(c), // 31
                  PathIterator.SEG_LINETO);
    harness.check(c[0], 60);                  // 32
    harness.check(c[1], 61);                  // 33


    resPiter.next();
    harness.check(resPiter.isDone());         // 34
    harness.check(piter.isDone());            // 35
  }

View Full Code Here

   * together with a SEG_LINETO segment.
   */
  public void test_connecting(TestHarness harness)
  {
    GeneralPath path;
    PathIterator pit;
    float[] c = new float[6];


    harness.checkPoint("connecting");
    path = new GeneralPath();
    path.moveTo(10, 11);
    path.append(new Line2D.Double(20, 21, 30, 31).getPathIterator(null),
                /* connecting */ true);
    pit = path.getPathIterator(null);
    
    harness.check(!pit.isDone());             // 1
    harness.check(pit.currentSegment(c),      // 2
                  PathIterator.SEG_MOVETO);
    harness.check(c[0], 10);                  // 3
    harness.check(c[1], 11);                  // 4
    pit.next();
    harness.check(!pit.isDone());             // 5
    harness.check(pit.currentSegment(c),      // 6
                  PathIterator.SEG_LINETO);
    harness.check(c[0], 20);                  // 7
    harness.check(c[1], 21);                  // 8
    pit.next();
    harness.check(!pit.isDone());             // 9
    harness.check(pit.currentSegment(c),      // 10
                  PathIterator.SEG_LINETO);
    harness.check(c[0], 30);                  // 11
    harness.check(c[1], 31);                  // 12
    pit.next();
    harness.check(pit.isDone());              // 13
  }

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  /**
   * Appends an empty path iterator to an empty GeneralPath.
   */
  public void test_empty(TestHarness harness)
  {
    PathIterator pit, respit;
    GeneralPath path;


    harness.checkPoint("empty");
    path = new GeneralPath();

View Full Code Here




  public void test_untransformed(TestHarness harness)
  {
    QuadCurve2D curve;
    PathIterator pit;
    double[] c = new double[6];


    harness.checkPoint("untransformed");
    curve = new QuadCurve2D.Double(1, 2, 3, 4, 5, 6);
    pit = curve.getPathIterator(null);


    harness.check(!pit.isDone());                                   // 1
    harness.check(pit.currentSegment(c), PathIterator.SEG_MOVETO);  // 2
    harness.check(c[0], 1.0);                                       // 3
    harness.check(c[1], 2.0);                                       // 4


    pit.next();
    harness.check(!pit.isDone());                                   // 5
    harness.check(pit.currentSegment(c), PathIterator.SEG_QUADTO);  // 6
    harness.check(c[0], 3.0);                                       // 7
    harness.check(c[1], 4.0);                                       // 8
    harness.check(c[2], 5.0);                                       // 9
    harness.check(c[3], 6.0);                                       // 10


    pit.next();
    harness.check(pit.isDone());                                    // 11
    harness.check(pit.getWindingRule(), PathIterator.WIND_NON_ZERO);// 12
  }

View Full Code Here




  public void test_transformed(TestHarness harness)
  {
    QuadCurve2D curve;
    PathIterator pit;
    AffineTransform tx;
    double[] c = new double[6];


    harness.checkPoint("transformed");
    tx = new AffineTransform();
    tx.scale(2, 3);
    tx.translate(1, -1);
    curve = new QuadCurve2D.Double(1, 2, 3, 4, 5, 6);
    pit = curve.getPathIterator(tx);


    harness.check(!pit.isDone());                                   // 1
    harness.check(pit.currentSegment(c), PathIterator.SEG_MOVETO);  // 2
    harness.check(c[0], 4.0);                                       // 3
    harness.check(c[1], 3.0);                                       // 4


    pit.next();
    harness.check(!pit.isDone());                                   // 5
    harness.check(pit.currentSegment(c), PathIterator.SEG_QUADTO);  // 6
    harness.check(c[0], 8.0);                                       // 7
    harness.check(c[1], 9.0);                                       // 8
    harness.check(c[2], 12.0);                                      // 9
    harness.check(c[3], 15.0);                                      // 10


    pit.next();
    harness.check(pit.isDone());                                    // 11


    harness.check(pit.getWindingRule(), PathIterator.WIND_NON_ZERO);// 12
  }

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   * transform is being passed.
   */
  private void test_untransformed(TestHarness h)
  {
    GeneralPath path;
    PathIterator pit;
    float[] f = new float[6];
    double[] d = new double[6];


    h.checkPoint("untransformed");
    path = new GeneralPath(GeneralPath.WIND_EVEN_ODD);
    path.moveTo(10, 11);
    path.lineTo(20, 21);
    path.closePath();
    path.moveTo(30, 31);
    path.quadTo(40, 41, 42, 43);
    path.curveTo(50, 51, 52, 53, 54, 55);
    
    pit = path.getPathIterator(null);
    h.check(pit.getWindingRule(), PathIterator.WIND_EVEN_ODD); // 1
    h.check(!pit.isDone());                                    // 2
    h.check(pit.currentSegment(f), PathIterator.SEG_MOVETO);   // 3
    h.check(f[0], 10);                                         // 4
    h.check(f[1], 11);                                         // 5
    h.check(pit.currentSegment(d), PathIterator.SEG_MOVETO);   // 6
    h.check(d[0], 10);                                         // 7
    h.check(d[1], 11);                                         // 8
    pit.next();
    h.check(!pit.isDone());                                    // 9
    h.check(pit.currentSegment(f), PathIterator.SEG_LINETO);   // 10
    h.check(f[0], 20);                                         // 11
    h.check(f[1], 21);                                         // 12
    h.check(pit.currentSegment(d), PathIterator.SEG_LINETO);   // 13
    h.check(d[0], 20);                                         // 14
    h.check(d[1], 21);                                         // 15
    pit.next();
    h.check(!pit.isDone());                                    // 16
    h.check(pit.currentSegment(f), PathIterator.SEG_CLOSE) ;   // 17
    h.check(pit.currentSegment(d), PathIterator.SEG_CLOSE) ;   // 18
    pit.next();
    h.check(!pit.isDone());                                    // 19
    h.check(pit.currentSegment(f), PathIterator.SEG_MOVETO);   // 20
    h.check(f[0], 30);                                         // 21
    h.check(f[1], 31);                                         // 22
    h.check(pit.currentSegment(d), PathIterator.SEG_MOVETO);   // 23
    h.check(d[0], 30);                                         // 24
    h.check(d[1], 31);                                         // 25
    pit.next();
    h.check(!pit.isDone());                                    // 26
    h.check(pit.currentSegment(f), PathIterator.SEG_QUADTO);   // 27
    h.check(f[0], 40);                                         // 28
    h.check(f[1], 41);                                         // 29
    h.check(f[2], 42);                                         // 30
    h.check(f[3], 43);                                         // 31
    h.check(pit.currentSegment(d), PathIterator.SEG_QUADTO);   // 32
    h.check(d[0], 40);                                         // 33
    h.check(d[1], 41);                                         // 34
    h.check(d[2], 42);                                         // 35
    h.check(d[3], 43);                                         // 36
    pit.next();
    h.check(!pit.isDone());                                    // 37
    h.check(pit.currentSegment(f), PathIterator.SEG_CUBICTO);  // 38
    h.check(f[0], 50);                                         // 39
    h.check(f[1], 51);                                         // 40
    h.check(f[2], 52);                                         // 41
    h.check(f[3], 53);                                         // 42
    h.check(f[4], 54);                                         // 43
    h.check(f[5], 55);                                         // 44
    h.check(pit.currentSegment(d), PathIterator.SEG_CUBICTO);  // 45
    h.check(d[0], 50);                                         // 46
    h.check(d[1], 51);                                         // 47
    h.check(d[2], 52);                                         // 48
    h.check(d[3], 53);                                         // 49
    h.check(d[4], 54);                                         // 50
    h.check(d[5], 55);                                         // 51
    pit.next();
    h.check(pit.isDone());                                     // 52
  }

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   * transformation is being passed.
   */
  private void test_transformed(TestHarness h)
  {
    GeneralPath path;
    PathIterator pit;
    AffineTransform tx;
    float[] f = new float[6];
    double[] d = new double[6];


    h.checkPoint("transformed");
    path = new GeneralPath(GeneralPath.WIND_NON_ZERO);
    path.moveTo(10, 11);
    path.lineTo(20, 21);
    path.closePath();
    path.moveTo(30, 31);
    path.quadTo(40, 41, 42, 43);
    path.curveTo(50, 51, 52, 53, 54, 55);
    
    tx = new AffineTransform();
    tx.translate(2, 3);
    tx.scale(10, 10);


    pit = path.getPathIterator(tx);
    h.check(pit.getWindingRule(), PathIterator.WIND_NON_ZERO); // 1
    h.check(!pit.isDone());                                    // 2
    h.check(pit.currentSegment(f), PathIterator.SEG_MOVETO);   // 3
    h.check(f[0], 102);                                        // 4
    h.check(f[1], 113);                                        // 5
    h.check(pit.currentSegment(d), PathIterator.SEG_MOVETO);   // 6
    h.check(d[0], 102);                                        // 7
    h.check(d[1], 113);                                        // 8
    pit.next();
    h.check(!pit.isDone());                                    // 9
    h.check(pit.currentSegment(f), PathIterator.SEG_LINETO);   // 10
    h.check(f[0], 202);                                        // 11
    h.check(f[1], 213);                                        // 12
    h.check(pit.currentSegment(d), PathIterator.SEG_LINETO);   // 13
    h.check(d[0], 202);                                        // 14
    h.check(d[1], 213);                                        // 15
    pit.next();
    h.check(!pit.isDone());                                    // 16
    h.check(pit.currentSegment(f), PathIterator.SEG_CLOSE) ;   // 17
    h.check(pit.currentSegment(d), PathIterator.SEG_CLOSE) ;   // 18
    pit.next();
    h.check(!pit.isDone());                                    // 19
    h.check(pit.currentSegment(f), PathIterator.SEG_MOVETO);   // 20
    h.check(f[0], 302);                                        // 21
    h.check(f[1], 313);                                        // 22
    h.check(pit.currentSegment(d), PathIterator.SEG_MOVETO);   // 23
    h.check(d[0], 302);                                        // 24
    h.check(d[1], 313);                                        // 25
    pit.next();
    h.check(!pit.isDone());                                    // 26
    h.check(pit.currentSegment(f), PathIterator.SEG_QUADTO);   // 27
    h.check(f[0], 402);                                        // 28
    h.check(f[1], 413);                                        // 29
    h.check(f[2], 422);                                        // 30
    h.check(f[3], 433);                                        // 31
    h.check(pit.currentSegment(d), PathIterator.SEG_QUADTO);   // 32
    h.check(d[0], 402);                                        // 33
    h.check(d[1], 413);                                        // 34
    h.check(d[2], 422);                                        // 35
    h.check(d[3], 433);                                        // 36
    pit.next();
    h.check(!pit.isDone());                                    // 37
    h.check(pit.currentSegment(f), PathIterator.SEG_CUBICTO);  // 38
    h.check(f[0], 502);                                        // 39
    h.check(f[1], 513);                                        // 40
    h.check(f[2], 522);                                        // 41
    h.check(f[3], 533);                                        // 42
    h.check(f[4], 542);                                        // 43
    h.check(f[5], 553);                                        // 44
    h.check(pit.currentSegment(d), PathIterator.SEG_CUBICTO);  // 45
    h.check(d[0], 502);                                        // 46
    h.check(d[1], 513);                                        // 47
    h.check(d[2], 522);                                        // 48
    h.check(d[3], 533);                                        // 49
    h.check(d[4], 542);                                        // 50
    h.check(d[5], 553);                                        // 51
    pit.next();
    h.check(pit.isDone());                                     // 52
  }

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            final char ch = s.charAt(i);
            System.out.println("Getting index for char: " + ch);
            final int index = encTable.getTableFormat().getGlyphIndex(ch);
            final TTFGlyph glyph = (TTFGlyph) glyphTable.getGlyph(index);
            final GeneralPath shape = glyph.getShape();
            PathIterator pi = shape.getPathIterator(null);
            final float[] f = new float[6];
            while (!pi.isDone()) {
                final int type = pi.currentSegment(f);
                System.out.println(types[type] + ",\t(" + f[0] + "," + f[1] + "),\t(" + f[2] + "," + f[3] + "),\t(" +
                    f[4] + "," + f[5] + ")");
                pi.next();
            }
        }
    }

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