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Interface java.awt.geom.PathIterator

Implementing Classes:
FlatteningPathIterator

public interface PathIterator

Field Summary
static byte  SEG_CLOSE
The point type 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.
static byte  SEG_CUBICTO
The point type for the set of 3 points that specify a cubic parametric curve to be drawn from the most recently specified point.
static byte  SEG_LINETO
The point type for a point that specifies the end point of a line to be drawn from the most recently specified point.
static byte  SEG_MOVETO
The point type for a point that specifies the starting location for a new subpath.
static byte  SEG_QUADTO
The point type for the pair of points that specify a quadratic parametric curve to be drawn from the most recently specified point.
static byte  WIND_EVEN_ODD
An even-odd winding rule for determining the interior of a path.
static byte  WIND_NON_ZERO
A non-zero winding rule for determining the interior of a path.
 

Method Summary
int  currentSegment(float[] coords)
Returns the coordinates and type of the current path segment in the iteration.
int  currentSegment(double[] coords)
Returns the coordinates and type of the current path segment in the iteration.
int  getWindingRule()
Return the winding rule for determining the interior of the path.
boolean  isDone()
Tests if there are more points to read.
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.
 

Field Detail

WIND_EVEN_ODD

public static final byte WIND_EVEN_ODD
An even-odd winding rule for determining the interior of a path.

WIND_NON_ZERO

public static final byte WIND_NON_ZERO
A non-zero winding rule for determining the interior of a path.

SEG_MOVETO

public static final byte SEG_MOVETO
The point type for a point that specifies the starting location for a new subpath.

SEG_LINETO

public static final byte SEG_LINETO
The point type for a point that specifies the end point of a line to be drawn from the most recently specified point.

SEG_QUADTO

public static final byte SEG_QUADTO
The point type 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)!)
 

SEG_CUBICTO

public static final byte SEG_CUBICTO
The point type 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.

SEG_CLOSE

public static final byte SEG_CLOSE
The point type 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.
Method Detail

getWindingRule

public int getWindingRule()
Return the winding rule for determining the interior of the path.
See Also:
WIND_EVEN_ODD, WIND_NON_ZERO

isDone

public boolean isDone()
Tests if there are more points to read.
Returns:
true if there are more points to read

next

public 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

public 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 may 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 will return one point, SEG_QUADTO will return two points, SEG_CUBICTO will return 3 points and SEG_CLOSE will not return any points.
See Also:
SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, SEG_CLOSE

currentSegment

public 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 may 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 will return one point, SEG_QUADTO will return two points, SEG_CUBICTO will return 3 points and SEG_CLOSE will not return any points.
See Also:
SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, SEG_CLOSE

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