Java 2D API: 3 - - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

Java 2D^TM API

3.3 Combining Areas to Create New Shapes

Areas can be used to quickly construct complex Shapes from simple shapes such as circles and squares. To create a new complex Shape by combining Areas:

Using Shapes, construct the Areas to be combined.
Call the appropriate Boolean operators: add, subtract, intersect, exclusiveOr.

For example, CAG could be used to create a pear like that shown in Figure 3-2.

Figure 3-2 Pear constructed from circles

The body of the pear is constructed by performing a union operation on two overlapping Areas: a circle and an oval. The leaves are each created by performing an intersection on two overlapping circles and then joined into a single Shape through a union operation. Overlapping circles are also used to construct the stem through two subtraction operations.

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