Lesson: Overview of the Java 2D API Concepts课程：Java 2D API概念概述

The Java 2D API provides two-dimensional graphics, text, and imaging capabilities for Java programs through extensions to the Abstract Windowing Toolkit (AWT).Java2D API通过对抽象窗口工具包（AWT）的扩展，为Java程序提供了二维图形、文本和图像功能。This comprehensive rendering package supports line art, text, and images in a flexible, full-featured framework for developing richer user interfaces, sophisticated drawing programs, and image editors.这个全面的渲染包在一个灵活、功能齐全的框架中支持线条艺术、文本和图像，以开发更丰富的用户界面、复杂的绘图程序和图像编辑器。Java 2D objects exist on a plane called user coordinate space, or just user space.Java2D对象存在于一个称为用户坐标空间的平面上，或仅存在于用户空间中。When objects are rendered on a screen or a printer, user space coordinates are transformed to device space coordinates.在屏幕或打印机上渲染对象时，用户空间坐标将转换为设备空间坐标。The following links are useful to start learning about the Java 2D API:以下链接有助于开始学习Java 2D API：

• Graphics classGraphics类
• Graphics2D classGraphics2D类

The Java 2D API provides following capabilities:Java 2D API提供以下功能：

• A uniform rendering model for display devices and printers显示设备和打印机的一致性渲染模型
• A wide range of geometric primitives, such as curves, rectangles, and ellipses, as well as a mechanism for rendering virtually any geometric shape广泛的几何图元，如曲线、矩形和椭圆，以及用于渲染几乎任何几何形状的机制
• Mechanisms for performing hit detection on shapes, text, and images对形状、文本和图像执行命中检测的机制
• A compositing model that provides control over how overlapping objects are rendered一种合成模型，用于控制重叠对象的渲染方式
• Enhanced color support that facilitates color management增强的颜色支持，有助于颜色管理
• Support for printing complex documents支持打印复杂文档
• Control of the quality of the rendering through the use of rendering hints通过使用渲染提示控制渲染质量

These topics are discussed in the following sections:以下章节将讨论这些主题：

• Java 2D RenderingJava 2D渲染
• Geometric Primitives几何图元
• Text文本
• Images图像
• Printing打印