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java.awt.geom package define common
graphics primitives, such as points, lines, curves, arcs, rectangles,
and ellipses.
Arc2D
|
Ellipse2D
|
QuadCurve2D
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Area
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GeneralPath
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Rectangle2D
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CubicCurve2D
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Line2D
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RectangularShape
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Dimension2D
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Point2D
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RoundRectangle2D
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Except for Point2D
and Dimension2D,
each of the geometry classes (geometries)
implements the Shape
interface, which provides a common set of methods for describing and
inspecting two-dimensional geometric objects.
With these classes you can create virtually any geometric shape and
render it through Graphics2D by calling the
draw method or the fill method. For example,
the geometric shapes in the following ShapesDemo2D applet
are defined by using basic Java 2D geometries.
If you're curious, the code for this program, is in
ShapesDemo2D.javasourceIcon (in a .java source file)
How to draw and fill shapes is described in the next lesson,
display/index
Displaying Graphics with Graphics2D
This figure has been reduced to fit on the page.
Click the image to view it at its natural size.
Rectangle2D, RoundRectangle2D,
Arc2D, and Ellipse2D primitives are all
derived from RectangularShape, which defines methods for
Shape objects that can be described by a rectangular
bounding box. The geometry of a RectangularShape can be
extrapolated from a rectangle that completely encloses the outline of
the Shape.
QuadCurve2D class allows you to create quadratic
parametric curve segments. A quadratic curve is defined by two endpoints
and one control point.
The CubicCurve2D class allows you to create cubic parametric
curve segments. A cubic curve is defined by two endpoints and two control
points. The following figures demonstrate examples of
quadratic and cubic curves. See
display/strokeandfillStroking and Filling
Graphics
Primitives to see implementations of cubic and quadratic curves.
GeneralPath class enables you to construct an
arbitrary shape by specifying a series of positions along the shape's
boundary. These positions can be connected by line segments, quadratic
curves, or cubic (Bézier) curves. The shape pictured below can be
created with three line segments and a cubic curve. See
display/strokeandfillStroking and Filling
Graphics
Primitives to see the implementation of this shape.
Area class you can perform boolean operations,
such as union, intersection, and subtraction, on any two
Shape objects. This technique, often referred to as
constructive area geometry, enables you to quickly create complex
Shape
objects without having to describe each line segment or curve.
| coordinateoverview text |
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