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Line2D.Double (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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java.awt.geom
Class Line2D.Double

java.lang.Object
  extended by java.awt.geom.Line2D
      extended by java.awt.geom.Line2D.Double
All Implemented Interfaces:
Shape, Serializable, Cloneable
Enclosing class:
Line2D
public static class Line2D.Double
extends Line2D
implements Serializable

A line segment specified with double coordinates.

Since:
1.2
See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from class java.awt.geom.Line2D
Line2D.Double, Line2D.Float
 
Field Summary
 double x1
          The X coordinate of the start point of the line segment.
 double x2
          The X coordinate of the end point of the line segment.
 double y1
          The Y coordinate of the start point of the line segment.
 double y2
          The Y coordinate of the end point of the line segment.
 
Constructor Summary
Line2D.Double()
          Constructs and initializes a Line with coordinates (0, 0) -> (0, 0).
Line2D.Double(double x1, double y1, double x2, double y2)
          Constructs and initializes a Line2D from the specified coordinates.
Line2D.Double(Point2D p1, Point2D p2)
          Constructs and initializes a Line2D from the specified Point2D objects.
 
Method Summary
 Rectangle2D getBounds2D()
          Returns a high precision and more accurate bounding box of the Shape than the getBounds method.
 Point2D getP1()
          Returns the start Point2D of this Line2D.
 Point2D getP2()
          Returns the end Point2D of this Line2D.
 double getX1()
          Returns the X coordinate of the start point in double precision.
 double getX2()
          Returns the X coordinate of the end point in double precision.
 double getY1()
          Returns the Y coordinate of the start point in double precision.
 double getY2()
          Returns the Y coordinate of the end point in double precision.
 void setLine(double x1, double y1, double x2, double y2)
          Sets the location of the end points of this Line2D to the specified double coordinates.
 
Methods inherited from class java.awt.geom.Line2D
clone, contains, contains, contains, contains, getBounds, getPathIterator, getPathIterator, intersects, intersects, intersectsLine, intersectsLine, linesIntersect, ptLineDist, ptLineDist, ptLineDist, ptLineDistSq, ptLineDistSq, ptLineDistSq, ptSegDist, ptSegDist, ptSegDist, ptSegDistSq, ptSegDistSq, ptSegDistSq, relativeCCW, relativeCCW, relativeCCW, setLine, setLine
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

x1

public double x1
The X coordinate of the start point of the line segment.

Since:
1.2

y1

public double y1
The Y coordinate of the start point of the line segment.

Since:
1.2

x2

public double x2
The X coordinate of the end point of the line segment.

Since:
1.2

y2

public double y2
The Y coordinate of the end point of the line segment.

Since:
1.2
Constructor Detail

Line2D.Double

public Line2D.Double()
Constructs and initializes a Line with coordinates (0, 0) -> (0, 0).

Since:
1.2

Line2D.Double

public Line2D.Double(double x1,
                     double y1,
                     double x2,
                     double y2)
Constructs and initializes a Line2D from the specified coordinates.

Parameters:
x1 - the X coordinate of the start point
y1 - the Y coordinate of the start point
x2 - the X coordinate of the end point
y2 - the Y coordinate of the end point
Since:
1.2

Line2D.Double

public Line2D.Double(Point2D p1,
                     Point2D p2)
Constructs and initializes a Line2D from the specified Point2D objects.

Parameters:
p1 - the start Point2D of this line segment
p2 - the end Point2D of this line segment
Since:
1.2
Method Detail

getX1

public double getX1()
Returns the X coordinate of the start point in double precision.

Specified by:
getX1 in class Line2D
Returns:
the X coordinate of the start point of this Line2D object.
Since:
1.2

getY1

public double getY1()
Returns the Y coordinate of the start point in double precision.

Specified by:
getY1 in class Line2D
Returns:
the Y coordinate of the start point of this Line2D object.
Since:
1.2

getP1

public Point2D getP1()
Returns the start Point2D of this Line2D.

Specified by:
getP1 in class Line2D
Returns:
the start Point2D of this Line2D.
Since:
1.2

getX2

public double getX2()
Returns the X coordinate of the end point in double precision.

Specified by:
getX2 in class Line2D
Returns:
the X coordinate of the end point of this Line2D object.
Since:
1.2

getY2

public double getY2()
Returns the Y coordinate of the end point in double precision.

Specified by:
getY2 in class Line2D
Returns:
the Y coordinate of the end point of this Line2D object.
Since:
1.2

getP2

public Point2D getP2()
Returns the end Point2D of this Line2D.

Specified by:
getP2 in class Line2D
Returns:
the end Point2D of this Line2D.
Since:
1.2

setLine

public void setLine(double x1,
                    double y1,
                    double x2,
                    double y2)
Sets the location of the end points of this Line2D to the specified double coordinates.

Specified by:
setLine in class Line2D
Parameters:
x1 - the X coordinate of the start point
y1 - the Y coordinate of the start point
x2 - the X coordinate of the end point
y2 - the Y coordinate of the end point
Since:
1.2

getBounds2D

public Rectangle2D getBounds2D()
Returns a high precision and more accurate bounding box of the Shape than the getBounds method. Note that there is no guarantee that the returned Rectangle2D is the smallest bounding box that encloses the Shape, only that the Shape lies entirely within the indicated Rectangle2D. The bounding box returned by this method is usually tighter than that returned by the getBounds method and never fails due to overflow problems since the return value can be an instance of the Rectangle2D that uses double precision values to store the dimensions.

Specified by:
getBounds2D in interface Shape
Returns:
an instance of Rectangle2D that is a high-precision bounding box of the Shape.
Since:
1.2
See Also:
Shape.getBounds()
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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.

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