3.1 Interfaces and Classes

The following tables list the key geometry interfaces and classes. Most of these interfaces and classes are part of the java.awt.geom package. Some, like Shape, are part of the java.awt package, primarily to maintain backward compatibility with earlier versions of the JDK software.

Interface	Description
PathIterator	Defines methods for retrieving elements from a path.
Shape (java.awt)	Provides a common set of methods for describing and inspecting geometric path objects. Implemented by GeneralPath and other geometry classes.

Class	Description
Arc2D Arc2D.Double Arc2D.Float	Extends: RectangularShape Represents an arc defined by a bounding rectangle, start angle, angular extent, and a closure type. Implemented to specify arcs in float and double precision: Arc2D.Float and Arc2D.Double.
Area	Implements: Shape, Cloneable Represents an area geometry that supports boolean operations.
CubicCurve2D CubicCurve2D.Double CubicCurve2D.Float	Implements: Shape Represents a cubic parametric curve segment in (w) coordinate space. Implemented to specify cubic curves in float and double precision: CubicCurve2D.Float and CubicCurve2D.Double.
Dimension2D	Encapsulates a width and height dimension. Abstract superclass for all objects that store a 2D dimension.
Ellipse2D Ellipse2D.Double Ellipse2D.Float	Extends: RectangularShape Represents an ellipse defined by a bounding rectangle. Implemented to specify ellipses in float and double precision: Ellipse2D.Float and Ellipse2D.Double.
FlatteningPathIterator	Returns a flattened view of a PathIterator object. Can be used to provide flattening behavior for Shapes that don't perform the interpolation calculations themselves.
GeneralPath	Implements: Shape Represents a geometric path constructed from lines and quadratic and cubic curves.
Line2D Line2D.Double Line2D.Float	Implements: Shape Represents a line segment in (x, y) coordinate space. Implemented to specify lines in float and double precision: Line2D.Float and Line2D.Double.
Point2D Point2D.Double Point2D.Float	A point representing a location in (x,y) coordinate space. Implemented to specify points in float and double precision: Point2D.Float and Point2D.Double.
QuadCurve2D QuadCurve2D.Double QuadCurve2D.Float	Implements: Shape Represents a quadratic parametric curve segment in (x, y) coordinate space. Implemented to specify quadratic curves in float and double precision: QuadCurve2D.Float and QuadCurve2D.Double.
Rectangle2D Rectangle2D.Double Rectangle2D.Float	Extends: RectangularShape Represents a rectangle defined by a location (x, y) and dimension (w x h). Implemented to specify rectangles in float and double precision: Rectangle2D.Float and Rectangle2D.Double.
RectangularShape	Implements: Shape Provides common manipulation routines for operating on shapes that have rectangular bounds.
RoundRectangle2D RoundRectangle2D.Double RoundRectangle2D.Float	Extends: RectangularShape Represents a rectangle with rounded corners defined by a location (x, y), a dimension (w x h), and the width and height of the corner arc. Implemented to specify round rectangles in float and double precision: RoundRectangle2D.Float and RoundRectangle2D.Double.