RoundRectangle2D (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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java.awt.geom
Class RoundRectangle2D

java.lang.Object
  java.awt.geom.RectangularShape
      java.awt.geom.RoundRectangle2D

All Implemented Interfaces:: Shape, Cloneable

Direct Known Subclasses:: RoundRectangle2D.Double, RoundRectangle2D.Float

public abstract class RoundRectangle2D
extends RectangularShape
extends RectangularShape

The RoundRectangle2D class defines a rectangle with rounded corners defined by a location (x,y), a dimension (w x h), and the width and height of an arc with which to round the corners.

This class is the abstract superclass for all objects that store a 2D rounded rectangle. The actual storage representation of the coordinates is left to the subclass.

Since:: 1.2

Nested Class Summary

static class RoundRectangle2D.Double
          The Double class defines a rectangle with rounded corners all specified in double coordinates.

static class RoundRectangle2D.Float
          The Float class defines a rectangle with rounded corners all specified in float coordinates.

Constructor Summary

protected RoundRectangle2D()
          This is an abstract class that cannot be instantiated directly.

Method Summary

boolean contains(double x, double y)
          Tests if the specified coordinates are 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 rectangular area.

boolean equals(Object obj)
          Determines whether or not the specified Object is equal to this RoundRectangle2D.

abstract double getArcHeight()
          Gets the height of the arc that rounds off the corners.

abstract double getArcWidth()
          Gets the width of the arc that rounds off the corners.

PathIterator getPathIterator(AffineTransform at)
          Returns an iteration object that defines the boundary of this RoundRectangle2D.

int hashCode()
          Returns the hashcode for this RoundRectangle2D.

boolean intersects(double x, double y, double w, double h)
          Tests if the interior of the Shape intersects the interior of a specified rectangular area.

void setFrame(double x, double y, double w, double h)
          Sets the location and size of the framing rectangle of this Shape to the specified rectangular values.

abstract void setRoundRect(double x, double y, double w, double h, double arcWidth, double arcHeight)
          Sets the location, size, and corner radii of this RoundRectangle2D to the specified double values.

void setRoundRect(RoundRectangle2D rr)
          Sets this RoundRectangle2D to be the same as the specified RoundRectangle2D.

Methods inherited from class java.awt.geom.RectangularShape

clone, contains, contains, getBounds, getCenterX, getCenterY, getFrame, getHeight, getMaxX, getMaxY, getMinX, getMinY, getPathIterator, getWidth, getX, getY, intersects, isEmpty, setFrame, setFrame, setFrameFromCenter, setFrameFromCenter, setFrameFromDiagonal, setFrameFromDiagonal

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.awt.Shape

getBounds2D

Nested Class Summary
`static class`	`RoundRectangle2D.Double` The `Double` class defines a rectangle with rounded corners all specified in `double` coordinates.
`static class`	`RoundRectangle2D.Float` The `Float` class defines a rectangle with rounded corners all specified in `float` coordinates.

Constructor Summary
`protected`	`RoundRectangle2D()` This is an abstract class that cannot be instantiated directly.

Method Summary
`boolean`	`contains(double x, double y)` Tests if the specified coordinates are 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 rectangular area.
`boolean`	`equals(Object obj)` Determines whether or not the specified `Object` is equal to this `RoundRectangle2D`.
`abstract double`	`getArcHeight()` Gets the height of the arc that rounds off the corners.
`abstract double`	`getArcWidth()` Gets the width of the arc that rounds off the corners.
`PathIterator`	`getPathIterator(AffineTransform at)` Returns an iteration object that defines the boundary of this `RoundRectangle2D`.
`int`	`hashCode()` Returns the hashcode for this `RoundRectangle2D`.
`boolean`	`intersects(double x, double y, double w, double h)` Tests if the interior of the `Shape` intersects the interior of a specified rectangular area.
`void`	`setFrame(double x, double y, double w, double h)` Sets the location and size of the framing rectangle of this `Shape` to the specified rectangular values.
`abstract void`	`setRoundRect(double x, double y, double w, double h, double arcWidth, double arcHeight)` Sets the location, size, and corner radii of this `RoundRectangle2D` to the specified `double` values.
`void`	`setRoundRect(RoundRectangle2D rr)` Sets this `RoundRectangle2D` to be the same as the specified `RoundRectangle2D`.

Methods inherited from class java.awt.geom.RectangularShape
`clone, contains, contains, getBounds, getCenterX, getCenterY, getFrame, getHeight, getMaxX, getMaxY, getMinX, getMinY, getPathIterator, getWidth, getX, getY, intersects, isEmpty, setFrame, setFrame, setFrameFromCenter, setFrameFromCenter, setFrameFromDiagonal, setFrameFromDiagonal`

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

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

Constructor Detail

RoundRectangle2D

protected RoundRectangle2D()

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.

Since:: 1.2
See Also:: RoundRectangle2D.Float, RoundRectangle2D.Double

Method Detail

getArcWidth

public abstract double getArcWidth()

Gets the width of the arc that rounds off the corners.

Returns:: the width of the arc that rounds off the corners of this RoundRectangle2D.
Since:: 1.2

getArcHeight

public abstract double getArcHeight()

Gets the height of the arc that rounds off the corners.

Returns:: the height of the arc that rounds off the corners of this RoundRectangle2D.
Since:: 1.2

setRoundRect

public abstract void setRoundRect(double x,
                                  double y,
                                  double w,
                                  double h,
                                  double arcWidth,
                                  double arcHeight)

Sets the location, size, and corner radii of this RoundRectangle2D to the specified double values.

Parameters:: x - the X coordinate to which to set the location of this RoundRectangle2D; y - the Y coordinate to which to set the location of this RoundRectangle2D; w - the width to which to set this RoundRectangle2D; h - the height to which to set this RoundRectangle2D; arcWidth - the width to which to set the arc of this RoundRectangle2D; arcHeight - the height to which to set the arc of this RoundRectangle2D
Since:: 1.2

setRoundRect

public void setRoundRect(RoundRectangle2D rr)

Sets this RoundRectangle2D to be the same as the specified RoundRectangle2D.

Parameters:: rr - the specified RoundRectangle2D
Since:: 1.2

setFrame

public void setFrame(double x,
                     double y,
                     double w,
                     double h)

Sets the location and size of the framing rectangle of this Shape to the specified rectangular values.

Specified by:: setFrame in class RectangularShape

Parameters:: x - the X coordinate of the upper-left corner of the specified rectangular shape; y - the Y coordinate of the upper-left corner of the specified rectangular shape; w - the width of the specified rectangular shape; h - the height of the specified rectangular shape
Since:: 1.2
See Also:: RectangularShape.getFrame()

contains

public boolean contains(double x,
                        double y)

Tests if the specified coordinates are inside the boundary of the Shape.

Parameters:: x - the specified X coordinate to be tested; y - the specified Y coordinate to be tested
Returns:: true if the specified coordinates are inside the Shape boundary; false otherwise.
Since:: 1.2

intersects

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

Tests if the interior of the Shape intersects the interior of a specified rectangular area. The rectangular area is considered to intersect the Shape if any point is contained in both the interior of the Shape and the specified rectangular area.

The Shape.intersects() method allows a Shape implementation to conservatively return true when:

there is a high probability that the rectangular area and the Shape intersect, but
the calculations to accurately determine this intersection are prohibitively expensive.

This means that for some Shapes this method might return true even though the rectangular area does not intersect the Shape. The Area class performs more accurate computations of geometric intersection than most Shape objects and therefore can be used if a more precise answer is required.

Parameters:: x - the X coordinate of the upper-left corner of the specified rectangular area; y - the Y coordinate of the upper-left corner of the specified rectangular area; w - the width of the specified rectangular area; h - the height of the specified rectangular area
Returns:: true if the interior of the Shape and the interior of the rectangular area intersect, or are both highly likely to intersect and intersection calculations would be too expensive to perform; false otherwise.
Since:: 1.2
See Also:: Area

contains

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

Tests if the interior of the Shape entirely contains the specified rectangular area. All coordinates that lie inside the rectangular area must lie within the Shape for the entire rectanglar area to be considered contained within the Shape.

The Shape.contains() method allows a Shape implementation to conservatively return false when:

the intersect method returns true and
the calculations to determine whether or not the Shape entirely contains the rectangular area are prohibitively expensive.

This means that for some Shapes this method might return false even though the Shape contains the rectangular area. The Area class performs more accurate geometric computations than most Shape objects and therefore can be used if a more precise answer is required.

Parameters:: x - the X coordinate of the upper-left corner of the specified rectangular area; y - the Y coordinate of the upper-left corner of the specified rectangular area; w - the width of the specified rectangular area; h - the height of the specified rectangular area
Returns:: true if the interior of the Shape entirely contains the specified rectangular area; false otherwise or, if the Shape contains the rectangular area and the intersects method returns true and the containment calculations would be too expensive to perform.
Since:: 1.2
See Also:: Area, Shape.intersects(double, double, double, double)

getPathIterator

public PathIterator getPathIterator(AffineTransform at)

Returns an iteration object that defines the boundary of this RoundRectangle2D. The iterator for this class is multi-threaded safe, which means that this RoundRectangle2D class guarantees that modifications to the geometry of this RoundRectangle2D object do not affect any iterations of that geometry that are already in process.

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 RoundRectangle2D, one segment at a time.
Since:: 1.2

hashCode

public int hashCode()

Returns the hashcode for this RoundRectangle2D.

Overrides:: hashCode in class Object

Returns:: the hashcode for this RoundRectangle2D.
Since:: 1.6
See Also:: Object.equals(java.lang.Object), Hashtable

equals

public boolean equals(Object obj)

Determines whether or not the specified Object is equal to this RoundRectangle2D. The specified Object is equal to this RoundRectangle2D if it is an instance of RoundRectangle2D and if its location, size, and corner arc dimensions are the same as this RoundRectangle2D.

Overrides:: equals in class Object

Parameters:: obj - an Object to be compared with this RoundRectangle2D.
Returns:: true if obj is an instance of RoundRectangle2D and has the same values; false otherwise.
Since:: 1.6
See Also:: Object.hashCode(), Hashtable

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

RoundRectangle2D (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

java.awt.geom Class RoundRectangle2D

RoundRectangle2D

getArcWidth

getArcHeight

setRoundRect

setRoundRect

setFrame

contains

intersects

contains

getPathIterator

hashCode

equals

java.awt.geom
Class RoundRectangle2D