Interface PathIterator

Field Detail

• WIND_EVEN_ODD

  static final int WIND_EVEN_ODD

  The winding rule constant for specifying an even-odd rule for determining the interior of a path. The even-odd rule specifies that a point lies inside the path if a ray drawn in any direction from that point to infinity is crossed by path segments an odd number of times.

  See Also:

  Constant Field Values

• WIND_NON_ZERO

  static final int WIND_NON_ZERO

  The winding rule constant for specifying a non-zero rule for determining the interior of a path. The non-zero rule specifies that a point lies inside the path if a ray drawn in any direction from that point to infinity is crossed by path segments a different number of times in the counter-clockwise direction than the clockwise direction.

  See Also:

  Constant Field Values

• SEG_MOVETO

  static final int SEG_MOVETO

  The segment type constant for a point that specifies the starting location for a new subpath.

  See Also:

  Constant Field Values

• SEG_LINETO

  static final int SEG_LINETO

  The segment type constant for a point that specifies the end point of a line to be drawn from the most recently specified point.

  See Also:

  Constant Field Values

• SEG_QUADTO

  static final int SEG_QUADTO

  The segment type constant for the pair of points that specify a quadratic parametric curve to be drawn from the most recently specified point. The curve is interpolated by solving the parametric control equation in the range (t=[0..1]) using the most recently specified (current) point (CP), the first control point (P1), and the final interpolated control point (P2). The parametric control equation for this curve is:

            P(t) = B(2,0)*CP + B(2,1)*P1 + B(2,2)*P2
            0 <= t <= 1
  
          B(n,m) = mth coefficient of nth degree Bernstein polynomial
                 = C(n,m) * t^(m) * (1 - t)^(n-m)
          C(n,m) = Combinations of n things, taken m at a time
                 = n! / (m! * (n-m)!)
   

  See Also:

  Constant Field Values

• SEG_CUBICTO

  static final int SEG_CUBICTO

  The segment type constant for the set of 3 points that specify a cubic parametric curve to be drawn from the most recently specified point. The curve is interpolated by solving the parametric control equation in the range (t=[0..1]) using the most recently specified (current) point (CP), the first control point (P1), the second control point (P2), and the final interpolated control point (P3). The parametric control equation for this curve is:

            P(t) = B(3,0)*CP + B(3,1)*P1 + B(3,2)*P2 + B(3,3)*P3
            0 <= t <= 1
  
          B(n,m) = mth coefficient of nth degree Bernstein polynomial
                 = C(n,m) * t^(m) * (1 - t)^(n-m)
          C(n,m) = Combinations of n things, taken m at a time
                 = n! / (m! * (n-m)!)
   

  This form of curve is commonly known as a Bézier curve.

  See Also:

  Constant Field Values

• SEG_CLOSE

  static final int SEG_CLOSE

  The segment type constant that specifies that the preceding subpath should be closed by appending a line segment back to the point corresponding to the most recent SEG_MOVETO.

  See Also:

  Constant Field Values

Method Detail

• getWindingRule

  int getWindingRule()

  Returns the winding rule for determining the interior of the path.

  Returns:

  the winding rule.

  See Also:

  WIND_EVEN_ODD, WIND_NON_ZERO

• isDone

  boolean isDone()

  Tests if the iteration is complete.

  Returns:

  true if all the segments have been read; false otherwise.

• next

  void next()

  Moves the iterator to the next segment of the path forwards along the primary direction of traversal as long as there are more points in that direction.

• currentSegment

  int currentSegment(float[] coords)

  Returns the coordinates and type of the current path segment in the iteration. The return value is the path-segment type: SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE. A float array of length 6 must be passed in and can be used to store the coordinates of the point(s). Each point is stored as a pair of float x,y coordinates. SEG_MOVETO and SEG_LINETO types returns one point, SEG_QUADTO returns two points, SEG_CUBICTO returns 3 points and SEG_CLOSE does not return any points.

  Parameters:

  coords - an array that holds the data returned from this method

  Returns:

  the path-segment type of the current path segment.

  See Also:

  SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, SEG_CLOSE

• currentSegment

  int currentSegment(double[] coords)

  Returns the coordinates and type of the current path segment in the iteration. The return value is the path-segment type: SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE. A double array of length 6 must be passed in and can be used to store the coordinates of the point(s). Each point is stored as a pair of double x,y coordinates. SEG_MOVETO and SEG_LINETO types returns one point, SEG_QUADTO returns two points, SEG_CUBICTO returns 3 points and SEG_CLOSE does not return any points.

  Parameters:

  coords - an array that holds the data returned from this method

  Returns:

  the path-segment type of the current path segment.

  See Also:

  SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, SEG_CLOSE