JavaCh 15 Graphics 2011 04 01 Outline Graphical

Java@Ch 15. Graphics 2011. 04. 01

Outline • • Graphical Coodinate Systems The Graphics Class Drawing Strings, Lines, Rectangles, and Ovals Drawing Polygons and Polylines [Sample code] Test. Paint. Component. java Draw. Poly. Line. java

Graphical Coodinate Systems (0, 0) at the upper-left corner

The Graphics Class Java. awt. Graphics +set. Color(color: Color): void +set. Font(font: Font): void +draw. String(s: String , x: int , y: int): void +draw. Line(x 1, : int , y 1: int , x 2: int , y 2: int): void +draw. Rect(x: int , y: int , w: int , h: int): void +fill. Rect(x: int , y: int , w: int , h: int): void +draw. Round. Rect(x: int , y: int , w: int , h: int , aw: int , ah: int): void +fill. Round. Rect(x: int , y: int , w: int , h: int , aw: int , ah: int): void +draw 3 DRect(x: int , y: int , w: int , h: int , raised: boolean): void +fill 3 DRect(x: int , y: int , w: int , h: int , raised: boolean): void 課本 P. 523

Drawing Strings, Lines, Rectangles, and Ovals draw. String(String s, int x, int y) method draw. Line(int x 1, int y 1, int x 2, int y 2) method

程式範例: Test. Paint. Component. java 課本 P. 524 Liting 15. 1

draw. Rec(intx, int y, int w, int h) method fill. Rec(intx, int y, int w, int h) method

draw. Round. Rect(x, y, w, h, aw, ah) method draw. Oval(x, y , w, h) method

Drawing Arcs draw. Arc(int x, int y, int w, int h, int start. Angle, int arc. Angle) fill. Arc(int x, int y, int w, int h, int start. Angle, int arc. Angle)

範例練習: Draw. Arcs. java 課本 P. 530 Liting 15. 4

程式練習: 1. 用g. draw. Oval() 畫臉 2. fill. Oval() 畫眼睛 3. set. Color() 設定畫筆顏色 4. draw. Arc() 畫嘴巴 (需import java. awt. Color)

Drawing Polygons and Polylines Java. awt. Polygon +xpoints: int [] +ypoints: int [] +nponits: int [] +Polygon() +Polygon(xpoints: int [] , ypoints: int [] , npoints: int []) +add. Points(x: int, y: int) 課本 P. 532

程式範例: Draw. Poly. Line. java