Java™ How to Program, Seventh Edition

Summary

Section 12.1 Introduction

• Java’s coordinate system is a scheme for identifying every point on the screen.

• A coordinate pair is composed of an x-coordinate (the horizontal coordinate) and a y-coordinate (the vertical coordinate).

• Text and shapes are displayed on the screen by specifying coordinates. The coordinates are used to indicate where graphics should be displayed on a screen.

• Coordinate units are measured in pixels. A pixel is a display monitor’s smallest unit of resolution.

Section 12.2 Graphics Contexts and Graphics Objects

• A Java graphics context enables drawing on the screen.

• Class Graphics contains methods for drawing strings, lines, rectangles and other shapes. Methods are also included for font manipulation and color manipulation. ...