Java 2D API: 3 - - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

Java 2D 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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