java.awt.geom

## Class Path2D.Double

- java.lang.Object
- - java.awt.geom.Path2D
  - - java.awt.geom.Path2D.Double

- All Implemented Interfaces:
    Shape, Serializable, Cloneable
  Enclosing class:
    Path2D

      public static class Path2D.Double
      extends Path2D
      implements Serializable

  The `Double` class defines a geometric path with coordinates stored in double precision floating point.
  Since:
    1.6
  See Also:
    Serialized Form

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class java.awt.geom.Path2D

      `Path2D.Double, Path2D.Float`

  - ### Field Summary

    - ### Fields inherited from class java.awt.geom.Path2D

      `WIND_EVEN_ODD, WIND_NON_ZERO`

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `Double()` | Constructs a new empty double precision `Path2D` object with a default winding rule of `Path2D.WIND_NON_ZERO`.
    `Double(int rule)` | Constructs a new empty double precision `Path2D` object with the specified winding rule to control operations that require the interior of the path to be defined.
    `Double(int rule, int initialCapacity)` | Constructs a new empty double precision `Path2D` object with the specified winding rule and the specified initial capacity to store path segments.
    `Double(Shape s)` | Constructs a new double precision `Path2D` object from an arbitrary `Shape` object.
    `Double(Shape s, AffineTransform at)` | Constructs a new double precision `Path2D` object from an arbitrary `Shape` object, transformed by an `AffineTransform` object.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `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.
    `Object` | `clone()` | Creates a new object of the same class as this object.
    `void` | `curveTo(double x1, double y1, double x2, double y2, double x3, double 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 specified coordinates `(x3,y3)`, using the specified points `(x1,y1)` and `(x2,y2)` as Bézier control points.
    `Rectangle2D` | `getBounds2D()` | Returns a high precision and more accurate bounding box of the `Shape` than the `getBounds` method.
    `PathIterator` | `getPathIterator(AffineTransform at)` | Returns an iterator object that iterates along the `Shape` boundary and provides access to the geometry of the `Shape` outline.
    `void` | `lineTo(double x, double y)` | Adds a point to the path by drawing a straight line from the current coordinates to the new specified coordinates specified in double precision.
    `void` | `moveTo(double x, double y)` | Adds a point to the path by moving to the specified coordinates specified in double precision.
    `void` | `quadTo(double x1, double y1, double x2, double 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 specified coordinates `(x2,y2)`, using the specified point `(x1,y1)` as a quadratic parametric control point.
    `void` | `transform(AffineTransform at)` | Transforms the geometry of this path using the specified `AffineTransform`.

    - ### Methods inherited from class java.awt.geom.Path2D

      `append, closePath, contains, contains, contains, contains, contains, contains, contains, contains, createTransformedShape, getBounds, getCurrentPoint, getPathIterator, getWindingRule, intersects, intersects, intersects, intersects, reset, setWindingRule`

    - ### Methods inherited from class java.lang.Object

      `equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### Double

          public Double()

      Constructs a new empty double precision `Path2D` object with a default winding rule of `Path2D.WIND_NON_ZERO`.
      Since:
        1.6

    - #### Double

          public Double(int rule)

      Constructs a new empty double precision `Path2D` object with the specified winding rule to control operations that require the interior of the path to be defined.
      Parameters:
        `rule` - the winding rule
      Since:
        1.6
      See Also:
        `Path2D.WIND_EVEN_ODD`, `Path2D.WIND_NON_ZERO`

    - #### Double

          public Double(int rule,
                        int initialCapacity)

      Constructs a new empty double precision `Path2D` object with the specified winding rule and the specified initial capacity to store path segments. 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
      Since:
        1.6
      See Also:
        `Path2D.WIND_EVEN_ODD`, `Path2D.WIND_NON_ZERO`

    - #### Double

          public Double(Shape s)

      Constructs a new double precision `Path2D` 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
      Since:
        1.6

    - #### Double

          public Double(Shape s,
                        AffineTransform at)

      Constructs a new double precision `Path2D` object from an arbitrary `Shape` object, transformed by an `AffineTransform` object. All of the initial geometry and the winding rule for this path are taken from the specified `Shape` object and transformed by the specified `AffineTransform` object.
      Parameters:
        `s` - the specified `Shape` object
        `at` - the specified `AffineTransform` object
      Since:
        1.6

  - ### Method Detail

    - #### moveTo

          public final void moveTo(double x,
                                   double y)

      Adds a point to the path by moving to the specified coordinates specified in double precision.
      Specified by:
        `moveTo` in class `Path2D`
      Parameters:
        `x` - the specified X coordinate
        `y` - the specified Y coordinate
      Since:
        1.6

    - #### lineTo

          public final void lineTo(double x,
                                   double y)

      Adds a point to the path by drawing a straight line from the current coordinates to the new specified coordinates specified in double precision.
      Specified by:
        `lineTo` in class `Path2D`
      Parameters:
        `x` - the specified X coordinate
        `y` - the specified Y coordinate
      Since:
        1.6

    - #### quadTo

          public final void quadTo(double x1,
                                   double y1,
                                   double x2,
                                   double 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 specified coordinates `(x2,y2)`, using the specified point `(x1,y1)` as a quadratic parametric control point. All coordinates are specified in double precision.
      Specified by:
        `quadTo` in class `Path2D`
      Parameters:
        `x1` - the X coordinate of the quadratic control point
        `y1` - the Y coordinate of the quadratic control point
        `x2` - the X coordinate of the final end point
        `y2` - the Y coordinate of the final end point
      Since:
        1.6

    - #### curveTo

          public final void curveTo(double x1,
                                    double y1,
                                    double x2,
                                    double y2,
                                    double x3,
                                    double 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 specified coordinates `(x3,y3)`, using the specified points `(x1,y1)` and `(x2,y2)` as Bézier control points. All coordinates are specified in double precision.
      Specified by:
        `curveTo` in class `Path2D`
      Parameters:
        `x1` - the X coordinate of the first Bézier control point
        `y1` - the Y coordinate of the first Bézier control point
        `x2` - the X coordinate of the second Bézier control point
        `y2` - the Y coordinate of the second Bézier control point
        `x3` - the X coordinate of the final end point
        `y3` - the Y coordinate of the final end point
      Since:
        1.6

    - #### append

          public final 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.
      Specified by:
        `append` in class `Path2D`
      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
      Since:
        1.6

    - #### transform

          public final 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.
      Specified by:
        `transform` in class `Path2D`
      Parameters:
        `at` - the `AffineTransform` used to transform the area
      Since:
        1.6

    - #### getBounds2D

          public final 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.

      Note that the definition of insideness can lead to situations where points on the defining outline of the `shape` may not be considered contained in the returned `bounds` object, but only in cases where those points are also not considered contained in the original `shape`.

      If a `point` is inside the `shape` according to the `contains(point)` method, then it must be inside the returned `Rectangle2D` bounds object according to the `contains(point)` method of the `bounds`. Specifically:

      `shape.contains(p)` requires `bounds.contains(p)`

      If a `point` is not inside the `shape`, then it might still be contained in the `bounds` object:

      `bounds.contains(p)` does not imply `shape.contains(p)`

      Specified by:
        `getBounds2D` in interface `Shape`
      Returns:
        an instance of `Rectangle2D` that is a high-precision bounding box of the `Shape`.
      Since:
        1.6
      See Also:
        `Shape.getBounds()`

    - #### getPathIterator

          public final PathIterator getPathIterator(AffineTransform at)

      Returns an iterator object that iterates along the `Shape` boundary and provides access to the geometry of the `Shape` outline. If an optional `AffineTransform` is specified, the coordinates returned in the iteration are transformed accordingly.

      Each call to this method returns a fresh `PathIterator` object that traverses the geometry of the `Shape` object independently from any other `PathIterator` objects in use at the same time.

      It is recommended, but not guaranteed, that objects implementing the `Shape` interface isolate iterations that are in process from any changes that might occur to the original object's geometry during such iterations.

      The iterator for this class is not multi-threaded safe, which means that the `Path2D` class does not guarantee that modifications to the geometry of this `Path2D` 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
      Since:
        1.6

    - #### clone

          public final Object clone()

      Creates a new object of the same class as this object.
      Specified by:
        `clone` in class `Path2D`
      Returns:
        a clone of this instance.
      Throws:
        `OutOfMemoryError` - if there is not enough memory.
      Since:
        1.6
      See Also:
        `Cloneable`

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