GeneralPath (Java 2 Platform SE v1.4.1)

java.awt.geom
Class GeneralPath
java.lang.Object
  |
  +--java.awt.geom.GeneralPath
All Implemented Interfaces:
Cloneable, Shape

public final class GeneralPath
extends Object
implements Shape, Cloneable

The GeneralPath class represents a geometric path constructed from straight lines, and quadratic and cubic (Bézier) curves. It can contain multiple subpaths.
The winding rule specifies how the interior of a path is determined. There are two types of winding rules: EVEN_ODD and NON_ZERO.
An EVEN_ODD winding rule means that enclosed regions of the path alternate between interior and exterior areas as traversed from the outside of the path towards a point inside the region.
A NON_ZERO winding rule means that if a ray is drawn in any direction from a given point to infinity and the places where the path intersects the ray are examined, the point is inside of the path if and only if the number of times that the path crosses the ray from left to right does not equal the number of times that the path crosses the ray from right to left.

Field Summary
static int WIND_EVEN_ODD
    An even-odd winding rule for determining the interior of a path.
static int WIND_NON_ZERO
    A non-zero winding rule for determining the interior of a path.

Constructor Summary
GeneralPath()
    Constructs a new GeneralPath object.
GeneralPath(int rule)
    Constructs a new GeneralPath object with the specified winding rule to control operations that require the interior of the path to be defined.
GeneralPath(int rule, int initialCapacity)
    Constructs a new GeneralPath object with the specified winding rule and the specified initial capacity to store path coordinates.
GeneralPath(Shape s)
    Constructs a new GeneralPath object from an arbitrary Shape object.

Method Summary
void append(PathIterator pi, boolean connect)
    Appends the geometry of the specified PathIterator object to the path, possibly connecting the new geometry to the existing path segments with a line segment.
void append(Shape s, boolean connect)
    Appends the geometry of the specified Shape object to the path, possibly connecting the new geometry to the existing path segments with a line segment.
Object clone()
    Creates a new object of the same class as this object.
void closePath()
    Closes the current subpath by drawing a straight line back to the coordinates of the last moveTo.
boolean contains(double x, double y)
    Tests if the specified coordinates are inside the boundary of this Shape.
boolean contains(double x, double y, double w, double h)
    Tests if the specified rectangular area is inside the boundary of this Shape.
boolean contains(Point2D p)
    Tests if the specified Point2D is inside the boundary of this Shape.
boolean contains(Rectangle2D r)
    Tests if the specified Rectangle2D is inside the boundary of this Shape.
Shape createTransformedShape(AffineTransform at)
    Returns a new transformed Shape.
void curveTo(float x1, float y1, float x2, float y2, float x3, float y3)
    Adds a curved segment, defined by three new points, to the path by drawing a Bézier curve that intersects both the current coordinates and the coordinates (x3, y3), using the specified points (x1, y1) and (x2, y2) as Bézier control points.
Rectangle getBounds()
    Return the bounding box of the path.
Rectangle2D getBounds2D()
    Returns the bounding box of the path.
Point2D getCurrentPoint()
    Returns the coordinates most recently added to the end of the path as a Point2D object.
PathIterator getPathIterator(AffineTransform at)
    Returns a PathIterator object that iterates along the boundary of this Shape and provides access to the geometry of the outline of this Shape.
PathIterator getPathIterator(AffineTransform at, double flatness)
    Returns a PathIterator object that iterates along the boundary of the flattened Shape and provides access to the geometry of the outline of the Shape.
int getWindingRule()
    Returns the fill style winding rule.
boolean intersects(double x, double y, double w, double h)
    Tests if the interior of this Shape intersects the interior of a specified set of rectangular coordinates.
boolean intersects(Rectangle2D r)
    Tests if the interior of this Shape intersects the interior of a specified Rectangle2D.
void lineTo(float x, float y)
    Adds a point to the path by drawing a straight line from the current coordinates to the new specified coordinates.
void moveTo(float x, float y)
    Adds a point to the path by moving to the specified coordinates.
void quadTo(float x1, float y1, float x2, float y2)
    Adds a curved segment, defined by two new points, to the path by drawing a Quadratic curve that intersects both the current coordinates and the coordinates (x2, y2), using the specified point (x1, y1) as a quadratic parametric control point.
void reset()
    Resets the path to empty.
void setWindingRule(int rule)
    Sets the winding rule for this path to the specified value.
void transform(AffineTransform at)
    Transforms the geometry of this path using the specified AffineTransform.

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

Field Detail

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

See Also:
Constant Field Values

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

See Also:
Constant Field Values

Constructor Detail

GeneralPath
public GeneralPath()
Constructs a new GeneralPath object. If an operation performed on this path requires the interior of the path to be defined then the default NON_ZERO winding rule is used.

See Also:
WIND_NON_ZERO

GeneralPath
public GeneralPath(int rule)
Constructs a new GeneralPath object with the specified winding rule to control operations that require the interior of the path to be defined.

Parameters:
rule - the winding rule
See Also:
WIND_EVEN_ODD, WIND_NON_ZERO

GeneralPath
public GeneralPath(int rule,
                   int initialCapacity)
Constructs a new GeneralPath object with the specified winding rule and the specified initial capacity to store path coordinates. This number is an initial guess as to how many path segments are in the path, but the storage is expanded as needed to store whatever path segments are added to this path.

Parameters:
rule - the winding rule
initialCapacity - the estimate for the number of path segments in the path
See Also:
WIND_EVEN_ODD, WIND_NON_ZERO

GeneralPath
public GeneralPath(Shape s)
Constructs a new GeneralPath object from an arbitrary Shape object. All of the initial geometry and the winding rule for this path are taken from the specified Shape object.

Parameters:
s - the specified Shape object

Method Detail

moveTo
public void moveTo(float x,
                   float y)
Adds a point to the path by moving to the specified coordinates.

lineTo
public void lineTo(float x,
                   float y)
Adds a point to the path by drawing a straight line from the current coordinates to the new specified coordinates.

quadTo
public void quadTo(float x1,
                   float y1,
                   float x2,
                   float y2)
Adds a curved segment, defined by two new points, to the path by drawing a Quadratic curve that intersects both the current coordinates and the coordinates (x2, y2), using the specified point (x1, y1) as a quadratic parametric control point.

curveTo
public void curveTo(float x1,
                    float y1,
                    float x2,
                    float y2,
                    float x3,
                    float y3)
Adds a curved segment, defined by three new points, to the path by drawing a Bézier curve that intersects both the current coordinates and the coordinates (x3, y3), using the specified points (x1, y1) and (x2, y2) as Bézier control points.

closePath
public void closePath()
Closes the current subpath by drawing a straight line back to the coordinates of the last moveTo. If the path is already closed then this method has no effect.

append
public void append(Shape s,
                   boolean connect)
Appends the geometry of the specified Shape object to the path, possibly connecting the new geometry to the existing path segments with a line segment. If the connect parameter is true and the path is not empty then any initial moveTo in the geometry of the appended Shape is turned into a lineTo segment. If the destination coordinates of such a connecting lineTo segment match the ending coordinates of a currently open subpath then the segment is omitted as superfluous. The winding rule of the specified Shape is ignored and the appended geometry is governed by the winding rule specified for this path.

Parameters:
s - the Shape whose geometry is appended to this path
connect - a boolean to control whether or not to turn an initial moveTo segment into a lineTo segment to connect the new geometry to the existing path

append
public void append(PathIterator pi,
                   boolean connect)
Appends the geometry of the specified PathIterator object to the path, possibly connecting the new geometry to the existing path segments with a line segment. If the connect parameter is true and the path is not empty then any initial moveTo in the geometry of the appended Shape is turned into a lineTo segment. If the destination coordinates of such a connecting lineTo segment match the ending coordinates of a currently open subpath then the segment is omitted as superfluous. The winding rule of the specified Shape is ignored and the appended geometry is governed by the winding rule specified for this path.

Parameters:
pi - the PathIterator whose geometry is appended to this path
connect - a boolean to control whether or not to turn an initial moveTo segment into a lineTo segment to connect the new geometry to the existing path

getWindingRule
public int getWindingRule()
Returns the fill style winding rule.

Returns:
an integer representing the current winding rule.
See Also:
WIND_EVEN_ODD, WIND_NON_ZERO, setWindingRule(int)

setWindingRule
public void setWindingRule(int rule)
Sets the winding rule for this path to the specified value.

Parameters:
rule - an integer representing the specified winding rule
Throws:
IllegalArgumentException - if rule is not either WIND_EVEN_ODD or WIND_NON_ZERO
See Also:
WIND_EVEN_ODD, WIND_NON_ZERO, getWindingRule()

getCurrentPoint
public Point2D getCurrentPoint()
Returns the coordinates most recently added to the end of the path as a Point2D object.

Returns:
a Point2D object containing the ending coordinates of the path or null if there are no points in the path.

reset
public void reset()
Resets the path to empty. The append position is set back to the beginning of the path and all coordinates and point types are forgotten.

transform
public void transform(AffineTransform at)
Transforms the geometry of this path using the specified AffineTransform. The geometry is transformed in place, which permanently changes the boundary defined by this object.

Parameters:
at - the AffineTransform used to transform the area

createTransformedShape
public Shape createTransformedShape(AffineTransform at)
Returns a new transformed Shape.

Parameters:
at - the AffineTransform used to transform a new Shape.
Returns:
a new Shape, transformed with the specified AffineTransform.

getBounds
public Rectangle getBounds()
Return the bounding box of the path.

Specified by:
getBounds in interface Shape

Returns:
a Rectangle object that bounds the current path.
See Also:
Shape.getBounds2D()

getBounds2D
public Rectangle2D getBounds2D()
Returns the bounding box of the path.

Specified by:
getBounds2D in interface Shape

Returns:
a Rectangle2D object that bounds the current path.
See Also:
Shape.getBounds()

contains
public boolean contains(double x,
                        double y)
Tests if the specified coordinates are inside the boundary of this Shape.

Specified by:
contains in interface Shape

Returns:
true if the specified coordinates are inside this Shape; false otherwise

contains
public boolean contains(Point2D p)
Tests if the specified Point2D is inside the boundary of this Shape.

Specified by:
contains in interface Shape

Parameters:
p - the specified Point2D
Returns:
true if this Shape contains the specified Point2D, false otherwise.

contains
public boolean contains(double x,
                        double y,
                        double w,
                        double h)
Tests if the specified rectangular area is inside the boundary of this Shape.

Specified by:
contains in interface Shape

Parameters:
w - the width of the specified rectangular area
h - the height of the specified rectangular area
Returns:
true if this Shape contains the specified rectangluar area; false otherwise.
See Also:
Area, Shape.intersects(double, double, double, double)

contains
public boolean contains(Rectangle2D r)
Tests if the specified Rectangle2D is inside the boundary of this Shape.

Specified by:
contains in interface Shape

Parameters:
r - a specified Rectangle2D
Returns:
true if this Shape bounds the specified Rectangle2D; false otherwise.
See Also:
Shape.contains(double, double, double, double)

intersects
public boolean intersects(double x,
                          double y,
                          double w,
                          double h)
Tests if the interior of this 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 coordinates
h - the height of the specified rectangular coordinates
Returns:
true if this Shape and the interior of the specified set of rectangular coordinates intersect each other; false otherwise.
See Also:
Area

intersects
public boolean intersects(Rectangle2D r)
Tests if the interior of this Shape intersects the interior of a specified Rectangle2D.

Specified by:
intersects in interface Shape

Parameters:
r - the specified Rectangle2D
Returns:
true if this Shape and the interior of the specified Rectangle2D intersect each other; false otherwise.
See Also:
Shape.intersects(double, double, double, double)

getPathIterator
public PathIterator getPathIterator(AffineTransform at)
Returns a PathIterator object that iterates along the boundary of this Shape and provides access to the geometry of the outline of this Shape. The iterator for this class is not multi-threaded safe, which means that this GeneralPath class does not guarantee that modifications to the geometry of this GeneralPath object do not affect any iterations of that geometry that are already in process.

Specified by:
getPathIterator in interface Shape

Parameters:
at - an AffineTransform
Returns:
a new PathIterator that iterates along the boundary of this Shape and provides access to the geometry of this Shape's outline

getPathIterator
public PathIterator getPathIterator(AffineTransform at,
                                    double flatness)
Returns a PathIterator object that iterates along the boundary of the flattened Shape and provides access to the geometry of the outline of the Shape. The iterator for this class is not multi-threaded safe, which means that this GeneralPath class does not guarantee that modifications to the geometry of this GeneralPath object do not affect any iterations of that geometry that are already in process.

Specified by:
getPathIterator in interface Shape

Parameters:
at - an AffineTransform
flatness - the maximum distance that the line segments used to approximate the curved segments are allowed to deviate from any point on the original curve
Returns:
a new PathIterator that iterates along the flattened Shape boundary.

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

Constructor Summary
GeneralPath() Constructs a new GeneralPath object.
GeneralPath(int rule) Constructs a new GeneralPath object with the specified winding rule to control operations that require the interior of the path to be defined.
GeneralPath(int rule, int initialCapacity) Constructs a new GeneralPath object with the specified winding rule and the specified initial capacity to store path coordinates.
GeneralPath(Shape s) Constructs a new GeneralPath object from an arbitrary Shape object.

Method Summary
void	append(PathIterator pi, boolean connect) Appends the geometry of the specified PathIterator object to the path, possibly connecting the new geometry to the existing path segments with a line segment.
void	append(Shape s, boolean connect) Appends the geometry of the specified Shape object to the path, possibly connecting the new geometry to the existing path segments with a line segment.
Object	clone() Creates a new object of the same class as this object.
void	closePath() Closes the current subpath by drawing a straight line back to the coordinates of the last moveTo.
boolean	contains(double x, double y) Tests if the specified coordinates are inside the boundary of this Shape.
boolean	contains(double x, double y, double w, double h) Tests if the specified rectangular area is inside the boundary of this Shape.
boolean	contains(Point2D p) Tests if the specified Point2D is inside the boundary of this Shape.
boolean	contains(Rectangle2D r) Tests if the specified Rectangle2D is inside the boundary of this Shape.
Shape	createTransformedShape(AffineTransform at) Returns a new transformed Shape.
void	curveTo(float x1, float y1, float x2, float y2, float x3, float y3) Adds a curved segment, defined by three new points, to the path by drawing a Bézier curve that intersects both the current coordinates and the coordinates (x3, y3), using the specified points (x1, y1) and (x2, y2) as Bézier control points.
Rectangle	getBounds() Return the bounding box of the path.
Rectangle2D	getBounds2D() Returns the bounding box of the path.
Point2D	getCurrentPoint() Returns the coordinates most recently added to the end of the path as a Point2D object.
PathIterator	getPathIterator(AffineTransform at) Returns a PathIterator object that iterates along the boundary of this Shape and provides access to the geometry of the outline of this Shape.
PathIterator	getPathIterator(AffineTransform at, double flatness) Returns a PathIterator object that iterates along the boundary of the flattened Shape and provides access to the geometry of the outline of the Shape.
int	getWindingRule() Returns the fill style winding rule.
boolean	intersects(double x, double y, double w, double h) Tests if the interior of this Shape intersects the interior of a specified set of rectangular coordinates.
boolean	intersects(Rectangle2D r) Tests if the interior of this Shape intersects the interior of a specified Rectangle2D.
void	lineTo(float x, float y) Adds a point to the path by drawing a straight line from the current coordinates to the new specified coordinates.
void	moveTo(float x, float y) Adds a point to the path by moving to the specified coordinates.
void	quadTo(float x1, float y1, float x2, float y2) Adds a curved segment, defined by two new points, to the path by drawing a Quadratic curve that intersects both the current coordinates and the coordinates (x2, y2), using the specified point (x1, y1) as a quadratic parametric control point.
void	reset() Resets the path to empty.
void	setWindingRule(int rule) Sets the winding rule for this path to the specified value.
void	transform(AffineTransform at) Transforms the geometry of this path using the specified AffineTransform.

java.awt.geom Class GeneralPath

Field Summary

Constructor Summary

Method Summary

Field Detail

WIND_EVEN_ODD

WIND_NON_ZERO

Constructor Detail

GeneralPath

GeneralPath

GeneralPath

GeneralPath

Method Detail

moveTo

lineTo

quadTo

curveTo

closePath

append

append

getWindingRule

setWindingRule

getCurrentPoint

reset

transform

createTransformedShape

getBounds

getBounds2D

contains

contains

contains

contains

intersects

intersects

getPathIterator

getPathIterator

clone

java.awt.geom
Class GeneralPath