java.awt.geom

Class GeneralPath

java.lang.Object
- java.awt.geom.GeneralPath

Implemented Interfaces:: Cloneable, Shape

public final class GeneralPath

extends Object

implements Shape, Cloneable

A general geometric path, consisting of any number of subpaths constructed out of straight lines and cubic or quadratic Bezier curves.

The inside of the curve is defined for drawing purposes by a winding rule. Either the WIND_EVEN_ODD or WIND_NON_ZERO winding rule can be chosen.

A drawing of a GeneralPath

The EVEN_ODD winding rule defines a point as inside a path if: A ray from the point towards infinity in an arbitrary direction intersects the path an odd number of times. Points A and C in the image are considered to be outside the path. (both intersect twice) Point B intersects once, and is inside.

The NON_ZERO winding rule defines a point as inside a path if: The path intersects the ray in an equal number of opposite directions. Point A in the image is outside (one intersection in the ’up’ direction, one in the ’down’ direction) Point B in the image is inside (one intersection ’down’) Point C in the image is inside (two intersections in the ’down’ direction)

Since:: 1.2

See Also:: Line2D, CubicCurve2D, QuadCurve2D

Field Summary
`static int`	`WIND_EVEN_ODD` Same constant as `PathIterator.WIND_EVEN_ODD`.
`static int`	`WIND_NON_ZERO` Same constant as `PathIterator.WIND_NON_ZERO`.

Constructor Summary
`GeneralPath()` Constructs a GeneralPath with the default (NON_ZERO) winding rule and initial capacity (20).
`GeneralPath(int rule)` Constructs a GeneralPath with a specific winding rule and the default initial capacity (20).
`GeneralPath(int rule, int capacity)` Constructs a GeneralPath with a specific winding rule and the initial capacity.
`GeneralPath(Shape s)` Constructs a GeneralPath from an arbitrary shape object.

Method Summary
`void`	`append(Shape s, boolean connect)` Appends the segments of a Shape to the path.
`void`	`append(PathIterator iter, boolean connect)` Appends the segments of a PathIterator to this GeneralPath.
`Object`	`clone()` Creates a new shape of the same run-time type with the same contents as this one.
`void`	`closePath()` Closes the current subpath by drawing a line back to the point of the last moveTo, unless the path is already closed.
`boolean`	`contains(double x, double y)` Evaluates if a point is within the GeneralPath, The NON_ZERO winding rule is used, regardless of the set winding rule.
`boolean`	`contains(double x, double y, double w, double h)` Evaluates if a rectangle is completely contained within the path.
`boolean`	`contains(Point2D p)` Evaluates if a Point2D is within the GeneralPath, The NON_ZERO winding rule is used, regardless of the set winding rule.
`boolean`	`contains(Rectangle2D r)` Evaluates if a rectangle is completely contained within the path.
`Shape`	`createTransformedShape(AffineTransform xform)` Creates a transformed version of the path.
`void`	`curveTo(float x1, float y1, float x2, float y2, float x3, float y3)` Appends a cubic Bezier curve to the current path.
`Rectangle`	`getBounds()` Returns the path’s bounding box.
`Rectangle2D`	`getBounds2D()` Returns the path’s bounding box, in `float` precision
`Point2D`	`getCurrentPoint()` Returns the current appending point of the path.
`PathIterator`	`getPathIterator(AffineTransform at)` Creates a PathIterator for iterating along the segments of the path.
`PathIterator`	`getPathIterator(AffineTransform at, double flatness)` Creates a new FlatteningPathIterator for the path
`int`	`getWindingRule()` Returns the path’s current winding rule.
`boolean`	`intersects(double x, double y, double w, double h)` Evaluates if a rectangle intersects the path.
`boolean`	`intersects(Rectangle2D r)` Evaluates if a Rectangle2D intersects the path.
`void`	`lineTo(float x, float y)` Appends a straight line to the current path.
`void`	`moveTo(float x, float y)` Adds a new point to a path.
`void`	`quadTo(float x1, float y1, float x2, float y2)` Appends a quadratic Bezier curve to the current path.
`void`	`reset()` Resets the path.
`void`	`setWindingRule(int rule)` Sets the path’s winding rule, which controls which areas are considered ’inside’ or ’outside’ the path on drawing.
`void`	`transform(AffineTransform xform)` Applies a transform to the path.

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

WIND_EVEN_ODD

public static final int WIND_EVEN_ODD

Same constant as PathIterator.WIND_EVEN_ODD.
Field Value:
0

WIND_NON_ZERO

public static final int WIND_NON_ZERO

Same constant as PathIterator.WIND_NON_ZERO.
Field Value:
1

GeneralPath

public GeneralPath()

Constructs a GeneralPath with the default (NON_ZERO) winding rule and initial capacity (20).

GeneralPath

public GeneralPath(int rule)

Constructs a GeneralPath with a specific winding rule and the default initial capacity (20).
Parameters:
rule - the winding rule (WIND_NON_ZERO or WIND_EVEN_ODD)
Throws:
IllegalArgumentException - if rule is not one of the listed values.

GeneralPath

public GeneralPath(int rule,
                   int capacity)

Constructs a GeneralPath with a specific winding rule and the initial capacity. The initial capacity should be the approximate number of path segments to be used.
Parameters:
rule - the winding rule (WIND_NON_ZERO or WIND_EVEN_ODD)
capacity - the inital capacity, in path segments
Throws:
IllegalArgumentException - if rule is not one of the listed values.

GeneralPath

public GeneralPath(Shape s)

Constructs a GeneralPath from an arbitrary shape object. The Shapes PathIterator path and winding rule will be used.
Parameters:
s - the shape (null not permitted).
Throws:
NullPointerException - if shape is null.

append

public void append(Shape s,
                   boolean connect)

Appends the segments of a Shape to the path. If connect is true, the new path segments are connected to the existing one with a line. The winding rule of the Shape is ignored.
Parameters:
s - the shape (null not permitted).
connect - whether to connect the new shape to the existing path.
Throws:
NullPointerException - if s is null.

append

public void append(PathIterator iter,
                   boolean connect)

Appends the segments of a PathIterator to this GeneralPath. Optionally, the initial PathIterator.SEG_MOVETO segment of the appended path is changed into a PathIterator.SEG_LINETO segment.
Parameters:
iter - the PathIterator specifying which segments shall be appended (null not permitted).
connect - true for substituting the initial PathIterator.SEG_MOVETO segment by a PathIterator.SEG_LINETO, or false for not performing any substitution. If this GeneralPath is currently empty, connect is assumed to be false, thus leaving the initial PathIterator.SEG_MOVETO unchanged.

clone

public Object clone()

Creates a new shape of the same run-time type with the same contents as this one.
Overrides:
clone in interface Object
Returns:
the clone
Since:
1.2

closePath

public void closePath()

Closes the current subpath by drawing a line back to the point of the last moveTo, unless the path is already closed.

contains

public boolean contains(double x,
                        double y)

Evaluates if a point is within the GeneralPath, The NON_ZERO winding rule is used, regardless of the set winding rule.
Specified by:
contains in interface Shape
Parameters:
x - x coordinate of the point to evaluate
y - y coordinate of the point to evaluate
Returns:
true if the point is within the path, false otherwise

contains

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

Evaluates if a rectangle is completely contained within the path. This method will return false in the cases when the box intersects an inner segment of the path. (i.e.: The method is accurate for the EVEN_ODD winding rule)
Specified by:
contains in interface Shape

contains

public boolean contains(Point2D p)

Evaluates if a Point2D is within the GeneralPath, The NON_ZERO winding rule is used, regardless of the set winding rule.
Specified by:
contains in interface Shape
Parameters:
p - The Point2D to evaluate
Returns:
true if the point is within the path, false otherwise

contains

public boolean contains(Rectangle2D r)

Evaluates if a rectangle is completely contained within the path. This method will return false in the cases when the box intersects an inner segment of the path. (i.e.: The method is accurate for the EVEN_ODD winding rule)
Specified by:
contains in interface Shape
Parameters:
r - the rectangle
Returns:
true if the rectangle is completely contained within the path, false otherwise

createTransformedShape

public Shape createTransformedShape(AffineTransform xform)

Creates a transformed version of the path.
Parameters:
xform - the transform to apply
Returns:
a new transformed GeneralPath

curveTo

public void curveTo(float x1,
                    float y1,
                    float x2,
                    float y2,
                    float x3,
                    float y3)

Appends a cubic Bezier curve to the current path.
Parameters:
x1 - x coordinate of the first control point
y1 - y coordinate of the first control point
x2 - x coordinate of the second control point
y2 - y coordinate of the second control point
x3 - x coordinate of the curve endpoint.
y3 - y coordinate of the curve endpoint.

getBounds

public Rectangle getBounds()

Returns the path’s bounding box.
Specified by:
getBounds in interface Shape

getBounds2D

public Rectangle2D getBounds2D()

Returns the path’s bounding box, in float precision
Specified by:
getBounds2D in interface Shape

getCurrentPoint

public Point2D getCurrentPoint()

Returns the current appending point of the path.
Returns:
The point.

getPathIterator

public PathIterator getPathIterator(AffineTransform at)

Creates a PathIterator for iterating along the segments of the path.
Specified by:
getPathIterator in interface Shape
Parameters:
at - an affine transformation for projecting the returned points, or null to let the created iterator return the original points without any mapping.

getPathIterator

public PathIterator getPathIterator(AffineTransform at,
                                    double flatness)

Creates a new FlatteningPathIterator for the path
Specified by:
getPathIterator in interface Shape

getWindingRule

public int getWindingRule()

Returns the path’s current winding rule.
Returns:
WIND_EVEN_ODD or WIND_NON_ZERO.

intersects

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

Evaluates if a rectangle intersects the path.
Specified by:
intersects in interface Shape
Parameters:
x - x coordinate of the rectangle
y - y coordinate of the rectangle
w - width of the rectangle
h - height of the rectangle
Returns:
true if the rectangle intersects the path, false otherwise

intersects

public boolean intersects(Rectangle2D r)

Evaluates if a Rectangle2D intersects the path.
Specified by:
intersects in interface Shape
Parameters:
r - The rectangle
Returns:
true if the rectangle intersects the path, false otherwise

lineTo

public void lineTo(float x,
                   float y)

Appends a straight line to the current path.
Parameters:
x - x coordinate of the line endpoint.
y - y coordinate of the line endpoint.

moveTo

public void moveTo(float x,
                   float y)

Adds a new point to a path.
Parameters:
x - the x-coordinate.
y - the y-coordinate.

quadTo

public void quadTo(float x1,
                   float y1,
                   float x2,
                   float y2)

Appends a quadratic Bezier curve to the current path.
Parameters:
x1 - x coordinate of the control point
y1 - y coordinate of the control point
x2 - x coordinate of the curve endpoint.
y2 - y coordinate of the curve endpoint.

reset

public void reset()

Resets the path. All points and segments are destroyed.

setWindingRule

public void setWindingRule(int rule)

Sets the path’s winding rule, which controls which areas are considered ’inside’ or ’outside’ the path on drawing. Valid rules are WIND_EVEN_ODD for an even-odd winding rule, or WIND_NON_ZERO for a non-zero winding rule.
Parameters:
rule - the rule (WIND_EVEN_ODD or WIND_NON_ZERO).

transform

public void transform(AffineTransform xform)

Applies a transform to the path.
Parameters:
xform - the transform (null not permitted).

GeneralPath.java -- represents a shape built from subpaths Copyright (C) 2002, 2003, 2004, 2006 Free Software Foundation This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.

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java.awt.geom

Class GeneralPath

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Details

WIND_EVEN_ODD

WIND_NON_ZERO

Constructor Details

GeneralPath

GeneralPath

GeneralPath

GeneralPath

Method Details

append

append

clone

closePath

contains

contains

contains

contains

createTransformedShape

curveTo

getBounds

getBounds2D

getCurrentPoint

getPathIterator

getPathIterator

getWindingRule

intersects

intersects

lineTo

moveTo

quadTo

reset

setWindingRule

transform