java图形用户界面第七章.pptVIP

第 7 章;本章主要内容;一、图形用户界面(GUI）;AWT;Swing;Swing与AWT的主要区别;Swing与AWT的主要区别;与图形用户界面有关的包;二、Java的基本绘图;1、绘图类Graphics;Graphics类中的绘图成员方法;Graphics类中的绘图成员方法 ;利用Graphics类提供的成员方法绘图的基本步骤;import java.awt.*; import javax.swing.*; public class GraphicsDemo extends JPanel { public static void main(String[] agrs) { JFrame frm=new JFrame(绘图应用范例); frm.getContentPane().add(new GraphicsDemo()); frm.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE); frm.setSize(380,200); frm.setVisible(true); };public void paintComponent(Graphics g) {//刷新面板时，系统自动调用这个成员方法 super.paintComponent(g); g.drawString(绘图对象,5,40); g.drawLine(5,50,150,50); g.drawRect(5,55,50,50); g.fillRect(5,110,50,50); g.drawRoundRect(60,55,50,50,30,30); g.fillRoundRect(60,110,50,50,30,30); g.drawOval(115,55,50,50); g.fillOval(115,110,50,50); g.drawArc(100,5,100,100,0,45); g.fillArc(155,5,100,100,0,45); int x_vals[]={170,170,210,250,210}; int y_vals[]={60,100,100,80,60}; g.drawPolygon(x_vals,y_vals,x_vals.length); for (int i=0;i5;i++) y_vals[i]+=55; g.fillPolygon(x_vals,y_vals,x_vals.length); g.fill3DRect(260,5,100,70,true); g.fill3DRect(260,90,100,70,false); } };2、2D绘图方式;Graphics与Graphics2D的主要区别;Graphics2D类;获取Grphics2D对象的方式;Graphics2D类中提供的成员方法;在java.awt.geom包中定义了一系列实现Shape接口的几何图形类 ;Graphics2D应用举例;import java.awt.*; import java.awt.geom.*; import javax.swing.*; public class DrawTest { public static void main(String [ ] args) { DrawFrame frame=new DrawFrame(); frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE); frame.show(); } };import java.awt.*; import java.awt.geom.*; import javax.swing.*; public class DrawFrame extends JFrame { public DrawFrame() { setTitle(DrawTest); setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT); DrawPanel panel=new DrawPanel(); Co