Java How to Program, Early Objects, 11th Edition

Summary

Section 27.1 Introduction

• Java’s coordinate system (p. 2) is a scheme for identifying every point (p. 13) on the screen.

• A coordinate pair (p. 2) has an x-coordinate (horizontal) and a y-coordinate (vertical).

• Coordinates are used to indicate where graphics should be displayed on a screen.

• Coordinate units are measured in pixels (p. 2). A pixel is a display monitor’s smallest unit of resolution.

Section 27.2 Graphics Contexts and Graphics Objects

• A Java graphics context (p. 4) enables drawing on the screen.

• Class Graphics (p. 4) contains methods for drawing strings, lines, rectangles and other shapes. Methods are also included for font manipulation and color manipulation.

• A Graphics object manages a graphics context and draws pixels ...