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## java.awt.geom
Class CubicCurve2D

    java.lang.Object
      |
      +--java.awt.geom.CubicCurve2D

All Implemented Interfaces:
  Cloneable, Shape

Direct Known Subclasses:
  CubicCurve2D.Double, CubicCurve2D.Float

public abstract class CubicCurve2D
extends Object
implements Shape, Cloneable

The `CubicCurve2D` class defines a cubic parametric curve segment in (x, y) coordinate space.

This class is only the abstract superclass for all objects which store a 2D cubic curve segment. The actual storage representation of the coordinates is left to the subclass.

Nested Class Summary
`static class` | `CubicCurve2D.Double` A cubic parametric curve segment specified with double coordinates.
`static class` | `CubicCurve2D.Float` A cubic parametric curve segment specified with float coordinates.

Constructor Summary
`protected` | `CubicCurve2D()` This is an abstract class that cannot be instantiated directly.

Method Summary
`Object` | `clone()` Creates a new object of the same class as this object.
`boolean` | `contains(double x, double y)` Tests if a specified coordinate is inside the boundary of the shape.
`boolean` | `contains(double x, double y, double w, double h)` Tests if the interior of the shape entirely contains the specified set of rectangular coordinates.
`boolean` | `contains(Point2D p)` Tests if a specified `Point2D` is inside the boundary of the shape.
`boolean` | `contains(Rectangle2D r)` Tests if the interior of the shape entirely contains the specified `Rectangle2D`.
`Rectangle` | `getBounds()` Returns the bounding box of the shape.
`abstract Point2D` | `getCtrlP1()` Returns the first control point.
`abstract Point2D` | `getCtrlP2()` Returns the second control point.
`abstract double` | `getCtrlX1()` Returns the X coordinate of the first control point in double precision.
`abstract double` | `getCtrlX2()` Returns the X coordinate of the second control point in double precision.
`abstract double` | `getCtrlY1()` Returns the Y coordinate of the first control point in double precision.
`abstract double` | `getCtrlY2()` Returns the Y coordinate of the second control point in double precision.
`double` | `getFlatness()` Returns the flatness of this curve.
`static double` | `getFlatness(double[] coords, int offset)` Returns the flatness of the cubic curve specified by the controlpoints stored in the indicated array at the indicated index.
`static double` | `getFlatness(double x1, double y1, double ctrlx1, double ctrly1, double ctrlx2, double ctrly2, double x2, double y2)` Returns the flatness of the cubic curve specified by the indicated controlpoints.
`double` | `getFlatnessSq()` Returns the square of the flatness of this curve.
`static double` | `getFlatnessSq(double[] coords, int offset)` Returns the square of the flatness of the cubic curve specified by the controlpoints stored in the indicated array at the indicated index.
`static double` | `getFlatnessSq(double x1, double y1, double ctrlx1, double ctrly1, double ctrlx2, double ctrly2, double x2, double y2)` Returns the square of the flatness of the cubic curve specified by the indicated controlpoints.
`abstract Point2D` | `getP1()` Returns the start point.
`abstract Point2D` | `getP2()` Returns the end point.
`PathIterator` | `getPathIterator(AffineTransform at)` Returns an iteration object that defines the boundary of the shape.
`PathIterator` | `getPathIterator(AffineTransform at, double flatness)` Return an iteration object that defines the boundary of the flattened shape.
`abstract double` | `getX1()` Returns the X coordinate of the start point in double precision.
`abstract double` | `getX2()` Returns the X coordinate of the end point in double precision.
`abstract double` | `getY1()` Returns the Y coordinate of the start point in double precision.
`abstract double` | `getY2()` Returns the Y coordinate of the end point in double precision.
`boolean` | `intersects(double x, double y, double w, double h)` Tests if the shape intersects the interior of a specified set of rectangular coordinates.
`boolean` | `intersects(Rectangle2D r)` Tests if the shape intersects the interior of a specified `Rectangle2D`.
`void` | `setCurve(CubicCurve2D c)` Sets the location of the endpoints and controlpoints of this curve to the same as those in the specified `CubicCurve2D`.
`void` | `setCurve(double[] coords, int offset)` Sets the location of the endpoints and controlpoints of this curve to the double coordinates at the specified offset in the specified array.
`abstract void` | `setCurve(double x1, double y1, double ctrlx1, double ctrly1, double ctrlx2, double ctrly2, double x2, double y2)` Sets the location of the endpoints and controlpoints of this curve to the specified double coordinates.
`void` | `setCurve(Point2D[] pts, int offset)` Sets the location of the endpoints and controlpoints of this curve to the coordinates of the `Point2D` objects at the specified offset in the specified array.
`void` | `setCurve(Point2D p1, Point2D cp1, Point2D cp2, Point2D p2)` Sets the location of the endpoints and controlpoints of this curve to the specified `Point2D` coordinates.
`static int` | `solveCubic(double[] eqn)` Solves the cubic whose coefficients are in the `eqn` array and places the non-complex roots back into the same array, returning the number of roots.
`static int` | `solveCubic(double[] eqn, double[] res)` Solve the cubic whose coefficients are in the `eqn` array and place the non-complex roots into the `res` array, returning the number of roots.
`void` | `subdivide(CubicCurve2D left, CubicCurve2D right)` Subdivides this cubic curve and stores the resulting two subdivided curves into the left and right curve parameters.
`static void` | `subdivide(CubicCurve2D src, CubicCurve2D left, CubicCurve2D right)` Subdivides the cubic curve specified by the `src` parameter and stores the resulting two subdivided curves into the `left` and `right` curve parameters.
`static void` | `subdivide(double[] src, int srcoff, double[] left, int leftoff, double[] right, int rightoff)` Subdivides the cubic curve specified by the coordinates stored in the `src` array at indices `srcoff` through (`srcoff` + 7) and stores the resulting two subdivided curves into the two result arrays at the corresponding indices.

Methods inherited from class java.lang.Object
`equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface java.awt.Shape
`getBounds2D`

Constructor Detail

### CubicCurve2D

    protected CubicCurve2D()

  This is an abstract class that cannot be instantiated directly. Type-specific implementation subclasses are available for instantiation and provide a number of formats for storing the information necessary to satisfy the various accessor methods below.

See Also:
  `CubicCurve2D.Float`, `CubicCurve2D.Double`

Method Detail

### getX1

    public abstract double getX1()

  Returns the X coordinate of the start point in double precision.

  Returns:
    the X coordinate of the start point of the `CubicCurve2D`.

### getY1

    public abstract double getY1()

  Returns the Y coordinate of the start point in double precision.

  Returns:
    the Y coordinate of the start point of the `CubicCurve2D`.

### getP1

    public abstract Point2D getP1()

  Returns the start point.

  Returns:
    a `Point2D` that is the start point of the `CubicCurve2D`.

### getCtrlX1

    public abstract double getCtrlX1()

  Returns the X coordinate of the first control point in double precision.

  Returns:
    the X coordinate of the first control point of the `CubicCurve2D`.

### getCtrlY1

    public abstract double getCtrlY1()

  Returns the Y coordinate of the first control point in double precision.

  Returns:
    the Y coordinate of the first control point of the `CubicCurve2D`.

### getCtrlP1

    public abstract Point2D getCtrlP1()

  Returns the first control point.

  Returns:
    a `Point2D` that is the first control point of the `CubicCurve2D`.

### getCtrlX2

    public abstract double getCtrlX2()

  Returns the X coordinate of the second control point in double precision.

  Returns:
    the X coordinate of the second control point of the `CubicCurve2D`.

### getCtrlY2

    public abstract double getCtrlY2()

  Returns the Y coordinate of the second control point in double precision.

  Returns:
    the Y coordinate of the second control point of the `CubicCurve2D`.

### getCtrlP2

    public abstract Point2D getCtrlP2()

  Returns the second control point.

  Returns:
    a `Point2D` that is the second control point of the `CubicCurve2D`.

### getX2

    public abstract double getX2()

  Returns the X coordinate of the end point in double precision.

  Returns:
    the X coordinate of the end point of the `CubicCurve2D`.

### getY2

    public abstract double getY2()

  Returns the Y coordinate of the end point in double precision.

  Returns:
    the Y coordinate of the end point of the `CubicCurve2D`.

### getP2

    public abstract Point2D getP2()

  Returns the end point.

  Returns:
    a `Point2D` that is the end point of the `CubicCurve2D`.

### setCurve

    public abstract void setCurve(double x1,
                                  double y1,
                                  double ctrlx1,
                                  double ctrly1,
                                  double ctrlx2,
                                  double ctrly2,
                                  double x2,
                                  double y2)

  Sets the location of the endpoints and controlpoints of this curve to the specified double coordinates.

### setCurve

    public void setCurve(double[] coords,
                         int offset)

  Sets the location of the endpoints and controlpoints of this curve to the double coordinates at the specified offset in the specified array.

  Parameters:
    `coords` - a double array containing coordinates
    `offset` - the index of `coords` at which to begin setting the endpoints and controlpoints of this curve to the coordinates contained in `coords`

### setCurve

    public void setCurve(Point2D p1,
                         Point2D cp1,
                         Point2D cp2,
                         Point2D p2)

  Sets the location of the endpoints and controlpoints of this curve to the specified `Point2D` coordinates.

  Parameters:
    `p1` - the first specified `Point2D` used to set the start point of this curve
    `cp1` - the second specified `Point2D` used to set the first control point of this curve
    `cp2` - the third specified `Point2D` used to set the second control point of this curve
    `p2` - the fourth specified `Point2D` used to set the end point of this curve

### setCurve

    public void setCurve(Point2D[] pts,
                         int offset)

  Sets the location of the endpoints and controlpoints of this curve to the coordinates of the `Point2D` objects at the specified offset in the specified array.

  Parameters:
    `pts` - an array of `Point2D` objects
    `offset` - the index of `pts` at which to begin setting the endpoints and controlpoints of this curve to the points contained in `pts`

### setCurve

    public void setCurve(CubicCurve2D c)

  Sets the location of the endpoints and controlpoints of this curve to the same as those in the specified `CubicCurve2D`.

  Parameters:
    `c` - the specified `CubicCurve2D`

### getFlatnessSq

    public static double getFlatnessSq(double x1,
                                       double y1,
                                       double ctrlx1,
                                       double ctrly1,
                                       double ctrlx2,
                                       double ctrly2,
                                       double x2,
                                       double y2)

  Returns the square of the flatness of the cubic curve specified by the indicated controlpoints. The flatness is the maximum distance of a controlpoint from the line connecting the endpoints.

  Returns:
    the square of the flatness of the `CubicCurve2D` represented by the specified coordinates.

### getFlatness

    public static double getFlatness(double x1,
                                     double y1,
                                     double ctrlx1,
                                     double ctrly1,
                                     double ctrlx2,
                                     double ctrly2,
                                     double x2,
                                     double y2)

  Returns the flatness of the cubic curve specified by the indicated controlpoints. The flatness is the maximum distance of a controlpoint from the line connecting the endpoints.

  Returns:
    the flatness of the `CubicCurve2D` represented by the specified coordinates.

### getFlatnessSq

    public static double getFlatnessSq(double[] coords,
                                       int offset)

  Returns the square of the flatness of the cubic curve specified by the controlpoints stored in the indicated array at the indicated index. The flatness is the maximum distance of a controlpoint from the line connecting the endpoints.

  Parameters:
    `coords` - an array containing coordinates
    `offset` - the index of `coords` at which to begin setting the endpoints and controlpoints of this curve to the coordinates contained in `coords`
  Returns:
    the square of the flatness of the `CubicCurve2D` specified by the coordinates in `coords` at the specified offset.

### getFlatness

    public static double getFlatness(double[] coords,
                                     int offset)

  Returns the flatness of the cubic curve specified by the controlpoints stored in the indicated array at the indicated index. The flatness is the maximum distance of a controlpoint from the line connecting the endpoints.

  Parameters:
    `coords` - an array containing coordinates
    `offset` - the index of `coords` at which to begin setting the endpoints and controlpoints of this curve to the coordinates contained in `coords`
  Returns:
    the flatness of the `CubicCurve2D` specified by the coordinates in `coords` at the specified offset.

### getFlatnessSq

    public double getFlatnessSq()

  Returns the square of the flatness of this curve. The flatness is the maximum distance of a controlpoint from the line connecting the endpoints.

  Returns:
    the square of the flatness of this curve.

### getFlatness

    public double getFlatness()

  Returns the flatness of this curve. The flatness is the maximum distance of a controlpoint from the line connecting the endpoints.

  Returns:
    the flatness of this curve.

### subdivide

    public void subdivide(CubicCurve2D left,
                          CubicCurve2D right)

  Subdivides this cubic curve and stores the resulting two subdivided curves into the left and right curve parameters. Either or both of the left and right objects may be the same as this object or null.

  Parameters:
    `left` - the cubic curve object for storing for the left or first half of the subdivided curve
    `right` - the cubic curve object for storing for the right or second half of the subdivided curve

### subdivide

    public static void subdivide(CubicCurve2D src,
                                 CubicCurve2D left,
                                 CubicCurve2D right)

  Subdivides the cubic curve specified by the `src` parameter and stores the resulting two subdivided curves into the `left` and `right` curve parameters. Either or both of the `left` and `right` objects may be the same as the `src` object or `null`.

  Parameters:
    `src` - the cubic curve to be subdivided
    `left` - the cubic curve object for storing the left or first half of the subdivided curve
    `right` - the cubic curve object for storing the right or second half of the subdivided curve

### subdivide

    public static void subdivide(double[] src,
                                 int srcoff,
                                 double[] left,
                                 int leftoff,
                                 double[] right,
                                 int rightoff)

  Subdivides the cubic curve specified by the coordinates stored in the `src` array at indices `srcoff` through (`srcoff` + 7) and stores the resulting two subdivided curves into the two result arrays at the corresponding indices. Either or both of the `left` and `right` arrays may be `null` or a reference to the same array as the `src` array. Note that the last point in the first subdivided curve is the same as the first point in the second subdivided curve. Thus, it is possible to pass the same array for `left` and `right` and to use offsets, such as `rightoff` equals (`leftoff` + 6), in order to avoid allocating extra storage for this common point.

  Parameters:
    `src` - the array holding the coordinates for the source curve
    `srcoff` - the offset into the array of the beginning of the the 6 source coordinates
    `left` - the array for storing the coordinates for the first half of the subdivided curve
    `leftoff` - the offset into the array of the beginning of the the 6 left coordinates
    `right` - the array for storing the coordinates for the second half of the subdivided curve
    `rightoff` - the offset into the array of the beginning of the the 6 right coordinates

### solveCubic

    public static int solveCubic(double[] eqn)

  Solves the cubic whose coefficients are in the `eqn` array and places the non-complex roots back into the same array, returning the number of roots. The solved cubic is represented by the equation:

           eqn = {c, b, a, d}
           dx^3 + ax^2 + bx + c = 0

  A return value of -1 is used to distinguish a constant equation that might be always 0 or never 0 from an equation that has no zeroes.

  Parameters:
    `eqn` - an array containing coefficients for a cubic
  Returns:
    the number of roots, or -1 if the equation is a constant.

### solveCubic

    public static int solveCubic(double[] eqn,
                                 double[] res)

  Solve the cubic whose coefficients are in the `eqn` array and place the non-complex roots into the `res` array, returning the number of roots. The cubic solved is represented by the equation: eqn = {c, b, a, d} dx^3 + ax^2 + bx + c = 0 A return value of -1 is used to distinguish a constant equation, which may be always 0 or never 0, from an equation which has no zeroes.

  Parameters:
    `eqn` - the specified array of coefficients to use to solve the cubic equation
    `res` - the array that contains the non-complex roots resulting from the solution of the cubic equation
  Returns:
    the number of roots, or -1 if the equation is a constant

### contains

    public boolean contains(double x,
                            double y)

  Tests if a specified coordinate is inside the boundary of the shape.

  Specified by:
    `contains` in interface `Shape`
  Returns:
    `true` if the coordinate is inside the boundary of the shape; `false` otherwise.

### contains

    public boolean contains(Point2D p)

  Tests if a specified `Point2D` is inside the boundary of the shape.

  Specified by:
    `contains` in interface `Shape`
  Parameters:
    `p` - the specified `Point2D` to be tested
  Returns:
    `true` if the `p` is inside the boundary of the shape; `false` otherwise.

### intersects

    public boolean intersects(double x,
                              double y,
                              double w,
                              double h)

  Tests if the shape intersects the interior of a specified set of rectangular coordinates.

  Specified by:
    `intersects` in interface `Shape`
  Parameters:
    `w` - the width of the specified rectangular area
    `h` - the height of the specified rectangular area
  Returns:
    `true` if the shape intersects the interior of the specified rectangular area; `false` otherwise.
  See Also:
    `Area`

### intersects

    public boolean intersects(Rectangle2D r)

  Tests if the shape intersects the interior of a specified `Rectangle2D`.

  Specified by:
    `intersects` in interface `Shape`
  Parameters:
    `r` - the specified `Rectangle2D` to be tested
  Returns:
    `true` if the shape intersects the interior of the specified `Rectangle2D`; `false` otherwise.
  See Also:
    `Shape.intersects(double, double, double, double)`

### contains

    public boolean contains(double x,
                            double y,
                            double w,
                            double h)

  Tests if the interior of the shape entirely contains the specified set of rectangular coordinates.

  Specified by:
    `contains` in interface `Shape`
  Parameters:
    `w` - the width of the specified rectangular shape
    `h` - the height of the specified rectangular shape
  Returns:
    `true` if the shape entirely contains the specified set of rectangular coordinates; `false` otherwise.
  See Also:
    `Area`, `Shape.intersects(double, double, double, double)`

### contains

    public boolean contains(Rectangle2D r)

  Tests if the interior of the shape entirely contains the specified `Rectangle2D`.

  Specified by:
    `contains` in interface `Shape`
  Parameters:
    `r` - the specified `Rectangle2D` to be tested
  Returns:
    `true` if the shape entirely contains the specified `Rectangle2D`; `false` otherwise.
  See Also:
    `Shape.contains(double, double, double, double)`

### getBounds

    public Rectangle getBounds()

  Returns the bounding box of the shape.

  Specified by:
    `getBounds` in interface `Shape`
  Returns:
    a `Rectangle` that is the bounding box of the shape.
  See Also:
    `Shape.getBounds2D()`

### getPathIterator

    public PathIterator getPathIterator(AffineTransform at)

  Returns an iteration object that defines the boundary of the shape. The iterator for this class is not multi-threaded safe, which means that this `CubicCurve2D` class does not guarantee that modifications to the geometry of this `CubicCurve2D` object do not affect any iterations of that geometry that are already in process.

  Specified by:
    `getPathIterator` in interface `Shape`
  Parameters:
    `at` - an optional `AffineTransform` to be applied to the coordinates as they are returned in the iteration, or `null` if untransformed coordinates are desired
  Returns:
    the `PathIterator` object that returns the geometry of the outline of this `CubicCurve2D`, one segment at a time.

### getPathIterator

    public PathIterator getPathIterator(AffineTransform at,
                                        double flatness)

  Return an iteration object that defines the boundary of the flattened shape. The iterator for this class is not multi-threaded safe, which means that this `CubicCurve2D` class does not guarantee that modifications to the geometry of this `CubicCurve2D` object do not affect any iterations of that geometry that are already in process.

  Specified by:
    `getPathIterator` in interface `Shape`
  Parameters:
    `at` - an optional `AffineTransform` to be applied to the coordinates as they are returned in the iteration, or `null` if untransformed coordinates are desired
    `flatness` - the maximum amount that the control points for a given curve can vary from colinear before a subdivided curve is replaced by a straight line connecting the endpoints
  Returns:
    the `PathIterator` object that returns the geometry of the outline of this `CubicCurve2D`, one segment at a time.

### clone

    public Object clone()

  Creates a new object of the same class as this object.

  Overrides:
    `clone` in class `Object`
  Returns:
    a clone of this instance.
  Throws:
    `OutOfMemoryError` - if there is not enough memory.
  Since:
    1.2
  See Also:
    `Cloneable`

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.