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：http://blog.csdn.net/cooelf/article/details/40627249