java小程序

结果图：

代码：

import java.awt.Color;import java.awt.Graphics;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.io.IOException;import java.util.ArrayList;import javax.swing.JFrame;public class test {private static int dbline = 20;private static int currentPoint = 1;private static ArrayList<Integer> lineCountList = new ArrayList<Integer>();private static int lineNumber, pointIndex;private static int x, y;private static JFrame f = new JFrame();public static void main(String args[]) throws IOException {inti();f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);f.setSize(500, 500);f.setVisible(true);f.addMouseListener(new MouseAdapter() {public void mousePressed(MouseEvent e) {Graphics g = f.getLayeredPane().getGraphics();g.setColor(Color.DARK_GRAY);g.drawLine(0, 250, 500, 250);g.drawLine(250, 0, 250, 500);int oldx=-1,oldy=-1;while (currentPoint <= 80) {int[] locate=getPointLocate();int dx,dy;dx=250+locate[0]*40;dy=250-locate[1]*40;g.setColor(Color.green);g.fillArc(dx, dy, 8, 8, 0, 360);g.setColor(Color.red);if(oldx!=-1&&oldy!=-1){g.drawLine(oldx, oldy, dx, dy);}oldx=dx;oldy=dy;g.setColor(Color.blue);g.drawString(""+currentPoint, dx, dy);g.setColor(Color.red);currentPoint++;}}});}private static void inti() {lineCountList.clear();for (int i = 1; i < dbline; i++) {int currentLineCount = 2 * i;lineCountList.add(currentLineCount);}}public static void getLineNumber() {int algPoint = currentPoint;for (int o : lineCountList) {if (algPoint > o)algPoint = algPoint - o;else {pointIndex = algPoint;lineNumber = o / 2;return;}}}private static int [] getPointLocate() {getLineNumber();boolean isEven = (lineNumber % 2 == 0);boolean isLittle;int pointLocate = pointIndex - (lineNumber + 1);if (pointLocate <= 0)isLittle = true;elseisLittle = false;if (isEven && isLittle) {y = lineNumber / 2;x = lineNumber / 2 - (pointIndex - 1);}if (isEven && !isLittle) {x = -lineNumber / 2;y = lineNumber / 2 - pointLocate;}if (!isEven && isLittle) {y = -(lineNumber - 1) / 2;x = -(lineNumber - 1) / 2 + (pointIndex - 1);}if (!isEven && !isLittle) {x = (lineNumber + 1) / 2;y = -(lineNumber - 1) / 2 + pointLocate;}int [] locate=new int[]{x,y};return locate;}}