编译环境：
操作系统：Win8.1 64位
IDE平台：Visual Studio 2013 Ultimate
一、原理与步骤
二、代码实现
距离前方交会.java
package text;
import java.awt.*;
import java.awt.event.*;
import java.math.*;
import javax.swing.*;
import javax.swing.border.Border;
/**
* A frame with sample text components.
*/
public class 距离前方交会 extends JFrame
{
public static final int TEXTAREA_ROWS = 20;
public static final int TEXTAREA_COLUMNS = 40;
public 距离前方交会()
{
final JTextField A_X = new JTextField("37477");
final JTextField A_Y = new JTextField("16307");
final JTextField B_X = new JTextField("37327");
final JTextField B_Y = new JTextField("16078");
final JTextField C_X = new JTextField("37163");
final JTextField C_Y = new JTextField("16046");
JPanel northPanel = new JPanel();
final JTextField DAP = new JTextField("200");
final JTextField DBP = new JTextField("200");
final JTextField DCP = new JTextField("200");
JPanel WestPanel = new JPanel();
JLabel pic= new JLabel();
pic.setIcon(new ImageIcon("G:/workplace/距离前方交会/2.png"));
WestPanel.add(pic);
getContentPane().add(WestPanel, BorderLayout.WEST);
JPanel northPane2 = new JPanel();
//距离前方交会
northPane2.setLayout(new GridLayout(3, 8));
northPane2.add(new JLabel("A_X: ", SwingConstants.CENTER));
northPane2.add(A_X);
northPane2.add(new JLabel("A_Y: ", SwingConstants.CENTER));
northPane2.add(A_Y);
northPane2.add(new JLabel("B_X: ", SwingConstants.CENTER));
northPane2.add(B_X);
northPane2.add(new JLabel("B_Y: ", SwingConstants.CENTER));
northPane2.add(B_Y);
northPane2.add(new JLabel("C_X: ", SwingConstants.CENTER));
northPane2.add(C_X);
northPane2.add(new JLabel("C_Y: ", SwingConstants.CENTER));
northPane2.add(C_Y);
northPane2.add(new JLabel("DAP: ", SwingConstants.CENTER));
northPane2.add(DAP);
northPane2.add(new JLabel("DBP: ", SwingConstants.CENTER));
northPane2.add(DBP);
northPane2.add(new JLabel("DCP: ", SwingConstants.CENTER));
northPane2.add(DCP);
Border etched = BorderFactory.createEtchedBorder();
Border titled = BorderFactory.createTitledBorder(etched, "距离前方交会");
northPanel.setBorder(titled);
getContentPane().add(northPane2, BorderLayout.NORTH);
final JTextArea textArea = new JTextArea(20,40);
JScrollPane scrollPane = new JScrollPane(textArea);
getContentPane().add(scrollPane, BorderLayout.CENTER);
// add button to append text into the text area
JPanel southPanel = new JPanel();
JButton insertButton = new JButton("计算P点坐标");
insertButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
//坐标初始化
Double X1=Double.valueOf(A_X.getText()).doubleValue();
Double Y1=Double.valueOf(A_Y.getText()).doubleValue();
Double X2=Double.valueOf(B_X.getText()).doubleValue();
Double Y2=Double.valueOf(B_Y.getText()).doubleValue();
Double X3=Double.valueOf(C_X.getText()).doubleValue();
Double Y3=Double.valueOf(C_Y.getText()).doubleValue();
Double D_AP=Double.valueOf(DAP.getText()).doubleValue();
Double D_BP=Double.valueOf(DBP.getText()).doubleValue();
Double D_CP=Double.valueOf(DCP.getText()).doubleValue();
//A、B、P
Double D_AB=Math.sqrt( Math.pow((X1-X2),2)+Math.pow((Y1-Y2),2));
Double α_BAP=Math.acos((D_AB*D_AB+D_AP*D_AP-D_BP*D_BP)/(2*D_AB*D_AP));
//Double α_ABP=Math.acos((D_AB*D_AB+D_BP*D_BP-D_AP*D_AP)/2*D_AB*D_BP);
Double α_AB=90-Math.atan(Math.abs(Y2-Y1)/Math.abs(X2-X1));
Double α_AP=α_AB-α_BAP;
Double XP1=X1+D_AP*Math.cos(α_AP);
Double YP1=Y1+D_AP*Math.sin(α_AP);
//B、C、P
Double D_BC=Math.sqrt( Math.pow((X3-X2),2)+Math.pow((Y3-Y2),2));
Double α_CBP=Math.acos((D_BC*D_BC+D_BP*D_BP-D_CP*D_CP)/(2*D_BC*D_BP));
//Double α_BCP=Math.acos((D_BC*D_BC+D_CP*D_CP-D_BP*D_BP)/2*D_BC*D_CP);
Double α_BC=90-Math.atan(Math.abs(Y2-Y3)/Math.abs(X2-X3));
Double α_BP=α_BC-α_CBP;
Double XP2=X1+D_BP*Math.cos(α_BP);
Double YP2=Y1+D_BP*Math.sin(α_BP);
textArea.append("=====距离前方交会===="+"\n"+"参考值1:"+ "( " +XP1+","+YP1+")"
+ "\n"+"参考值2:"+"( " +XP2+","+YP2+")"
+ "\n"+"误差距离约:"+Math.round(miss(XP1,YP1,XP2,YP2))+"米");
}
public double miss(double XP1,double YP1,double XP2,double YP2){
return Math.sqrt(Math.pow((XP1-XP2),2)+Math.pow((YP1-YP2),2));
}
public double convert(String input){
Double a=Double.valueOf(input.split("°")[0]).doubleValue();
Double b=Double.valueOf(input.split("°")[1].split("'")[0]).doubleValue();
return a+b/60;
}
});
add(insertButton, BorderLayout.SOUTH);
pack();
}
}
Test.java
package text;
import java.awt.*;
import javax.swing.*;
public class Test
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
JFrame frame = new 距离前方交会();
frame.setTitle("距离前方交会");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
三、运行结果
原文地址：http://blog.csdn.net/cooelf/article/details/40627249
