Java绘图

import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Mygraph { public static void main(String args[]) { SimpleFrame frame=new SimpleFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.show(); } } class SimpleFrame extends JFrame { public SimpleFrame() { //设置窗口标题栏的文字 setTitle("My Graph"); //设置窗口的大小 setSize(width,height); //设置图标 Toolkit tk=Toolkit.getDefaultToolkit(); Image img=tk.getImage("icon.jpg"); setIconImage(img); //类java.awt.Dimension将组件的宽、高封装在单个对象中 //得到屏幕大小 Java提供了一个ToolKit类 他的getScreenSize方法可以获得屏幕尺寸 Dimension screenSize=tk.getScreenSize(); int screenHeight=screenSize.height; int screenWidth=screenSize.width; //框架定位 int x=(screenWidth-width)/2; int y=(screenHeight-height)/2; //设置组件的位置 setLocation(x,y); //设置框架大小可变 setVisible(true); //创建面板 DrawPanel_1 panel_1=new DrawPanel_1(); Container contentPane=getContentPane();//得到JFrame的内容窗格对象 contentPane.add(panel_1);//将组件加入到内容窗格中 } public static final int width=800; public static final int height=700; } class DrawPanel_1 extends JPanel implements ActionListener//DrawPanel_1类继承JPanel类并实现ActionListener接口 { public DrawPanel_1() { //创建按钮 MyButton1=new JButton("五边形"); MyButton2=new JButton("五角星"); MyButton3=new JButton("合并"); MyButton4=new JButton("心型线"); MyButton5=new JButton("八边形"); MyButton6=new JButton("半圆"); MyButton7=new JButton("抛物线"); btn1=new JButton("yellow"); btn2=new JButton("桌面颜色"); btn3=new JButton("white"); btn4=new JButton("Exit"); //将按钮加入panel 通过Container类的Add方法经一个组件加入的该容器中 add(MyButton1); add(MyButton2); add(MyButton3); add(MyButton4); add(MyButton5); add(MyButton6); add(MyButton7); add(btn1); add(btn2); add(btn3); add(btn4); //注册监听器 MyButton1.addActionListener(this); MyButton2.addActionListener(this); MyButton3.addActionListener(this); MyButton4.addActionListener(this); MyButton5.addActionListener(this); MyButton6.addActionListener(this); MyButton7.addActionListener(this); btn1.addActionListener(this); btn2.addActionListener(this); btn3.addActionListener(this); btn4.addActionListener(this); //注册鼠标监听器 addMouseMotionListener(new MouseMotionHandler()); //获取图像文件 image1=Toolkit.getDefaultToolkit().getImage("icon1.jpg"); image2=Toolkit.getDefaultToolkit().getImage("icon2.gif"); MediaTracker tracker=new MediaTracker(this); tracker.addImage(image1,1); tracker.addImage(image2,2); try { tracker.waitForID(1); } catch(InterruptedException exception) {} } public void paintComponent(Graphics g) //此方法自动执行 当窗口被重新绘制时 系统会自动调用该方法 { super.paintComponent(g); //默认设置背景颜色为白色 if(Buttonout==0) setBackground(Color.white); //创建文本框1 Font f=new Font("宋体",Font.BOLD+Font.ITALIC,25); g.setFont(f); g.drawString("绘制简单图形",50,100); //创建文本框2 Font s=new Font("宋体",Font.BOLD,15); g.setFont(s); g.drawString("此版权属函远所有 如有雷同 纯属巧合",500,600); //显示当前鼠标位置 String text="当前鼠标指针位置"+mousex+":"+mousey; g.drawString(text,10,60); //得到icon1的尺寸 int imagewidth1=image1.getWidth(this); int imageheight1=image1.getHeight(this); //得到icon2的尺寸 int imagewidth2=image2.getWidth(this); int imageheight2=image2.getHeight(this); //得到窗口尺寸 int FrameWidth=getWidth(); int FrameHeight=getHeight(); //把图片icon1放到左侧 int xm=20; int ym=FrameHeight/2; //把图片icon2放到右侧 int xn=FrameWidth-imagewidth2; int yn=FrameHeight/4; //显示图像 g.drawImage(image1,xm,ym,null); g.drawImage(image2,xn,yn,null); int width=800; int height=700; //画五边形 int x1=width/2; int y1=height/2; int radius_1=Math.min(width/3,height/3); Polygon p_1=new Polygon(); for(int i=0;i<5;i++) p_1.addPoint( (int)(x1+Math.cos((18+i*72)*Math.PI/180)*radius_1), (int)(y1-Math.sin((18+i*72)*Math.PI/180)*radius_1) ); if(Buttonout==1) { g.setColor(Color.cyan); g.drawPolygon(p_1); } //五角星 R:内接圆半径 r外接圆半径 r=R*cos(72) int x2=width/2; int y2=height/2; int radius_2=Math.min(width/3,height/3); Polygon p_2=new Polygon(); int xa[]=new int[5]; int ya[]=new int[5]; int xb[]=new int[5]; int yb[]=new int[5]; for(int i=0;i<5;i++) { xa[i]=(int)(x2+Math.cos((18+i*72)*Math.PI/180)*radius_2); ya[i]=(int)(y2-Math.sin((18+i*72)*Math.PI/180)*radius_2); } xb[0]=(int)(x2+Math.tan(36*Math.PI/180)*Math.cos(72*Math.PI/180)*radius_2); xb[1]=(int)(x2-Math.tan(36*Math.PI/180)*Math.cos(72*Math.PI/180)*radius_2); xb[2]=(int)(x2-Math.sin(36*Math.PI/180)*Math.cos(72*Math.PI/180)*2*radius_2); xb[3]=(int)(x2); xb[4]=(int)(x2+Math.sin(36*Math.PI/180)*Math.cos(72*Math.PI/180)*2*radius_2); yb[0]=(int)(y2-Math.cos(72*Math.PI/180)*radius_2); yb[1]=(int)(y2-Math.cos(72*Math.PI/180)*radius_2); yb[2]=(int)(y2+radius_2/Math.cos(36*Math.PI/180)*Math.cos(72*Math.PI/180)*Math.cos(72*Math.PI/180)); yb[3]=(int)(y2+Math.cos(72*Math.PI/180)/Math.cos(36*Math.PI/180)*radius_2); yb[4]=(int)(y2+radius_2/Math.cos(36*Math.PI/180)*Math.cos(72*Math.PI/180)*Math.cos(72*Math.PI/180)); for(int i=0;i<5;i++) { p_2.addPoint(xa[i],ya[i]); p_2.addPoint(xb[i],yb[i]); } if(Buttonout==2) { g.setColor(Color.red); g.drawPolygon(p_2); } //合并 if(Buttonout==3) { g.setColor(Color.darkGray); g.drawPolygon(p_1); g.drawPolygon(p_2); } //心型线 r=a(1+cosθ) int x3=width/2; int y3=height/4; Polygon p=new Polygon(); if(Buttonout==4) { for(int a=60;a<=210;a+=30) { for(int t=-90;t<270;t++) p.addPoint((int)(a*(1+Math.cos(t*Math.PI/180-Math.PI/2))*Math.cos(t*Math.PI/180)+x3),(int)(a*(1+Math.cos(t*Math.PI/180-Math.PI/2))*Math.sin(t*Math.PI/180)+y3)); g.setColor(new Color(200,a/2,a)); g.drawPolygon(p); } } //八边形 int x4=width/2; int y4=height/2; int radius_4=Math.min(width/3,height/3); Polygon p_4=new Polygon(); if(Buttonout==5) { for(int i=0;i<8;i++) p_4.addPoint( (int)(x4+Math.cos((22.5+i*45)*Math.PI/180)*radius_4), (int)(y4-Math.sin((22.5+i*45)*Math.PI/180)*radius_4) ); g.setColor(Color.black); g.drawPolygon(p_4); } //半圆 int x5a=width/4; int y5a=height*5/8; int x5b=width*3/4; int y5b=height*5/8; int radius_5=(x5b-x5a)/2; int startAngle=0; int arcAngle=180; if(Buttonout==6) { g.setColor(Color.magenta); //画线