Graphics JFrame. import java.awt.*; import javax.swing.*; public class XXX extends JFrame { public XXX() { ... main() public static
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1 Graphics javax.swing.* JFrame JFrame public class XXX extends JFrame { public XXX() { //... // ( )... main() public static public class XXX extends JFrame { public XXX() { setdefaultcloseoperation(jframe.exit_on_close); // setsize(, ); // //... // ( )... (new XXX()).setVisible(true); java XXX main() XXX ( ) setvisible()? main() main() System exit() ( ) 1
2 JFrame public class R8Sample1 extends JFrame { Font fn = new Font("Helvetica", Font.BOLD, 24); public R8Sample1() { new R8Sample1().setVisible(true); 1.2 R8Sample1 paint() JFrame public class R8Sample1 extends JFrame { Font fn = new Font("Helvetica", Font.BOLD, 24); public R8Sample1() { g2.setfont(fn); g2.setpaint(new Color(100, 0, 255)); g2.drawstring("hello, World", 100, 100); new R8Sample1().setVisible(true); JFrame paint() API javax.swing JFrame Container paint() paint() R8Sample1 JFrame paint() JFrame Container paint() paint() 2
3 JFrame 2 Graphics R8Sample1 Font Font fn = new Font("Helvetica", Font.BOLD, 24); paint() g2.setfont(fn); g2.setpaint(new Color(100, 0, 255)); g2.drawstring("hello, World", 30, 30); ( ) Font fn "Helvetica" "Serif" paint() paint() Graphics Graphics2D Graphics2D g2 ( ) ( 1 ) #8 1 a. java.awt.graphics drawstring() b. java.awt.color ( : new Color(...) ) c. 1 d. java.awt.graphics 1 3
4 2.1 : Graphics ( ) (0, 0) X Y R8Sample1 JFrame 400X400 JFrame JFrame (x,y) (x,y) fillrect() filloval() 1: fillrect filloval 2.2 : d. Graphics (= ) drawrect() fillrect() API g.fillrect(x, y,, ); (x, y) ( 1 ) drawoval() filloval() g.filloval(x, y,, ); ( 1 ) fillpolygon() 2 g.fillpolygon(a, b, n); n 2 n i (a[i], b[i]) API 3 Graphics2D Java2 Graphics? 1995 Java Java2 Graphics2D Graphics Graphics2D Java2 Graphics2D Graphics2D 4
5 ... g2... Graphics2D API import 1 public class R8Sample2 extends JFrame { public R8Sample2() { GeneralPath p1 = new GeneralPath(); for(int i = -15; i <= 15; ++i) { float x = i * 0.1f; float y = x*x*x - x; if(i == -15) p1.moveto(x*100f + 180f, -y*100f + 210f); else p1.lineto(x*100f + 180f, -y*100f + 210f); g2.setpaint(new Color(100, 0, 255)); g2.setstroke(new BasicStroke(3f)); g2.draw(p1); new R8Sample2().setVisible(true); GeneralPath (moveto()) / (lineto() curveto()) (closepath()) y = x 3 x x x200 yg (150,100) x y if moveto() lineto() Graphics2D draw() fill() draw() setpaint() (Color ) (GradientPaint ) setstroke() BasicStroke 3 5
6 Graphic2D translate() rotate() scale() / public class R8Sample3 extends JFrame { public R8Sample3() { GeneralPath p1 = new GeneralPath(); for(int i = -15; i <= 15; ++i) { float x = i * 0.1f; float y = x*x*x - x; if(i == -15) p1.moveto(x, y); else p1.lineto(x, y); g2.setpaint(new Color(100, 0, 255)); g2.setstroke(new BasicStroke(0.03f)); g2.translate(180f, 210f); g2.scale(100f, -100f); g2.draw(p1); new R8Sample3().setVisible(true); ( Y ) 1/100 #8 2 a. 2 b. c. X Y d. e. f. ( ) 2 4 6
7 GeneralPath lineto curveto Graphics2D setstroke() setpaint() translate() rotate() scale() public class R8Sample4 extends JFrame { GeneralPath l0 = new GeneralPath(), l1 = new GeneralPath(); public R8Sample4() { l0.moveto(40.0f, 40.0f); l0.lineto(120.0f, 120.0f); l0.lineto(160.0f, 40.0f); l0.closepath(); l1.moveto(50f, 80f); l1.lineto(100f, 80f); l1.curveto(200f, 80f, 100f, 150f, 150f, 150f); g2.setpaint(new GradientPaint(0f, 0f, Color.green, g2.fill(l0); g2.setstroke(new BasicStroke(20f)); g2.setpaint(new Color(250, 80, 100)); g2.draw(l1); 10f, 0f, Color.yellow, true)); g2.setpaint(new GradientPaint(0f, 0f, Color.red, g2.translate(100, 80); g2.draw(l0); new R8Sample4().setVisible(true); 200f, 0f, Color.blue, false)); #8 3 Graphics2D ( ) #8 4 / 5 #8 5 7
8 public class R8Sample5 extends JFrame { int[] xpts = new int[20]; int[] ypts = new int[20]; int[] width = new int[20]; int[] height = new int[20]; Color[] cols = new Color[20]; public R8Sample5() { for(int i = 0; i < 20; ++i) { xpts[i] = (int)(math.random()*150); ypts[i] = (int)(math.random()*250+50); width[i] = (int)(math.random()*100+10); height[i] = (int)(math.random()*100+10); cols[i] = new Color((int)(255*Math.random()), for(int i = 0; i < 20; ++i) { g2.setpaint(cols[i]); (int)(255*math.random()), (int)(255*math.random())); g2.fillrect(xpts[i], ypts[i], width[i], height[i]); new R8Sample5().setVisible(true); public class R8Sample6 extends JFrame { int[] xpts = new int[20]; int[] ypts = new int[20]; int[] width = new int[20]; int[] height = new int[20]; Color[] cols = new Color[20]; public R8Sample6() { for(int i = 0; i < 20; ++i) { xpts[i] = (int)(math.random()*150); ypts[i] = (int)(math.random()*250+50); width[i] = (int)(math.random()*100+10); height[i] = (int)(math.random()*100+10); cols[i] = new Color((int)(255*Math.random()), (int)(255*math.random()), (int)(255*math.random())); 8
9 for(int i = 0; i < 20; ++i) { g2.setpaint(cols[i]); g2.fillrect(xpts[i], ypts[i], width[i], height[i]); new R8Sample6().setVisible(true); 9
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