Java 窗口 绘制图形 #2
写在前面：
高考结束咧，爽到啊，好耶
完善了Java 窗口 绘制图形 #1里面的程序
加入了缩放平移功能，给代码加了注释
1 package my_package; 2 3 import java.awt.*; 4 import java.awt.Graphics; 5 import java.awt.event.MouseAdapter; 6 import java.awt.event.MouseEvent; 7 import java.awt.event.MouseMotionAdapter; 8 import java.awt.event.MouseWheelEvent; 9 import java.awt.event.MouseWheelListener; 10 import java.io.*; 11 import javax.swing.JFrame; 12 import javax.swing.JPanel; 13 14 public class PonysAlgorithm extends JFrame 15 { 16 private static final long serialVersionUID = 1L; 17 static int pony_winx=800,pony_winy=600;//窗口的长和宽 18 static double c_Pi=3.1415926f;//常数π 19 static int pony_scale=80;//窗口缩放变量 20 static int pony_x0=pony_winx/2,pony_y0=pony_winy/2;//坐标原点 21 static int pony_x0_tmp,pony_y0_tmp;//坐标原点随鼠标移动变化辅助变量 22 static int pony_precision=1000;//绘制时的精度 23 static int pony_framex_ori,pony_framey_ori;//鼠标移动辅助变量 24 25 static double pony_x(double i){//i是参数，此处为x变量表达式 26 return i; 27 } 28 static double pony_y(double i){//i是参数，此处为y变量表达式 29 return (6*(2*Math.pow(i, 7)+Math.pow(i, 4)-i))/Math.pow((Math.pow(i , 6)+2*Math.pow(i, 3)+1), 2); 30 } 31 32 public static void main(String[] args) throws Exception 33 { 34 JFrame ponyFrame=new JFrame("Pony's Algorithm"); 35 ponyFrame.setLayout(null); 36 JPanel ponyJPanel=new JPanel(){ 37 private static final long serialVersionUID = 1L; 38 39 public void paint(Graphics g){ 40 super.paint(g); 41 42 g.setColor(Color.GRAY); 43 /*Coordinate Axis*/ 44 g.drawLine(pony_x0, 0, pony_x0, pony_winy);//绘制y轴 45 g.drawLine(0, pony_y0, pony_winx, pony_y0);//绘制x轴 46 47 for(int i=pony_x0+pony_scale;i<=pony_winx;i+=pony_scale)//绘制x、y轴刻度 48 g.drawLine(i, pony_y0-5, i, pony_y0+5); 49 for(int i=pony_x0-pony_scale;i>0;i-=pony_scale) 50 g.drawLine(i, pony_y0-5, i, pony_y0+5); 51 for(int i=pony_y0+pony_scale;i<=pony_winy;i+=pony_scale) 52 g.drawLine(pony_x0-5, i, pony_x0+5, i); 53 for(int i=pony_y0-pony_scale;i>0;i-=pony_scale) 54 g.drawLine(pony_x0-5, i, pony_x0+5, i); 55 56 for(int i=1;pony_x0+i*pony_scale<pony_winx;++i)//绘制x、y轴刻度值 57 g.drawString(""+i, pony_x0+i*pony_scale-4, pony_y0+25); 58 for(int i=-1;pony_x0+i*pony_scale>0;--i) 59 g.drawString(""+i, pony_x0+i*pony_scale-4, pony_y0+25); 60 for(int i=1;pony_y0+i*pony_scale<pony_winy;++i) 61 g.drawString(""+(-i), pony_x0-25, pony_y0+i*pony_scale+4); 62 for(int i=-1;pony_y0+i*pony_scale>0;--i) 63 g.drawString(""+(-i), pony_x0-25, pony_y0+i*pony_scale+4); 64 65 /*CORE*/ 66 int tmpa,tmpb; 67 g.setColor(Color.BLUE); 68 for(int i=-100000;i<=100000;++i)//参数i，通过参数i的变化绘制出参数方程图像 69 { 70 tmpa=(int)(pony_x(i/(double)pony_precision)*pony_scale)+pony_x0; 71 tmpb=(int)(-pony_y(i/(double)pony_precision)*pony_scale)+pony_y0;if(tmpb==0) continue; 72 g.drawLine(tmpa, tmpb, tmpa, tmpb); 73 } 74 } 75 }; 76 77 /*Whole*/ 78 ponyFrame.setSize(pony_winx,pony_winy); 79 ponyFrame.setResizable(false); 80 ponyFrame.setLocationRelativeTo(null); 81 ponyFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 82 83 /*ICON*/ 84 File directory = new File(""); 85 ponyFrame.setIconImage(Toolkit.getDefaultToolkit().getImage(directory.getCanonicalPath()+"\\icons\\32.png")); 86 87 /*DRAW*/ 88 ponyJPanel.setBounds(2, 2, pony_winx-10, pony_winy-10); 89 ponyFrame.add(ponyJPanel); 90 ponyFrame.addMouseListener(new MouseAdapter() {//当鼠标键按下并移动时，记录变量 91 @Override 92 public void mousePressed(MouseEvent e) { 93 pony_framex_ori=e.getXOnScreen(); 94 pony_framey_ori=e.getYOnScreen(); 95 pony_x0_tmp=pony_x0; 96 pony_y0_tmp=pony_y0; 97 } 98 }); 99 ponyFrame.addMouseMotionListener(new MouseMotionAdapter() {//坐标原点的改变 100 @Override 101 public void mouseDragged(MouseEvent e) { 102 pony_x0=pony_x0_tmp+(e.getXOnScreen()-pony_framex_ori)/1; 103 pony_y0=pony_y0_tmp+(e.getYOnScreen()-pony_framey_ori)/1; 104 ponyJPanel.repaint(); 105 } 106 }); 107 ponyFrame.addMouseWheelListener(new MouseWheelListener() {//鼠标滚轮滚动时，对图像进行缩放 108 @Override 109 public void mouseWheelMoved(MouseWheelEvent e) { 110 if(e.getWheelRotation()==1) { 111 if(pony_scale>10) { 112 pony_scale-=1; 113 ponyJPanel.repaint(); 114 } 115 } 116 if(e.getWheelRotation()==-1) { 117 pony_scale+=1; 118 ponyJPanel.repaint(); 119 } 120 } 121 }); 122 123 ponyFrame.setVisible(true); 124 return; 125 } 126 }
附件：
*jar所在目录*\\icons\\
32.png
