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Swing / AWT / SWT

Drawing/moving problem: how to define destination? (code included)

Greenhorn

Posts: 10

posted 17 years ago

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Hi,
(sorry if my english is not understandable enough)

I have created a program where user can define start point and destination point with a mouse. After doing this line is drawn between these points(coordinates using drawLine).

Then I have this Run button and when it is pressed letter X starts to move to a direction which is "hard coded" to method (updateXPosition). This letter X moves once in a second(I am using thread and timer but timer is for other purposes). Starting point of letter X is start point(point what user has pressed first).

So I know:
+ coordinates of the start and destination
+ when to move letter X (thread/timer, it has to move once in a second)
+ coordinates where to start to move letter X
+ my current location (X current location)

My problem is:
How do I get that letter X to moves towards destination point once in a second???
What is a simpliest way to do it with my code??

Below is code of the program:
it is quite long but I really need help with this one.. Tried for days to solve this problem.

"Main"

private void initialize() {
        this.setTitle("test drawing");

}
 
private JFrame getJFrame() 
{
if (jFrame == null) 
{
jFrame = new JFrame();
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jFrame.setSize(771, 605);
jFrame.setContentPane(getJContentPane());
jFrame.setTitle("MR. DrawMasta");
}
return jFrame;
}
 
/** 
 * This method initializes jContentPane
 */
private JPanel getJContentPane() {
if (jContentPane == null) {
jLabel2 = new JLabel();
jLabel2.setBounds(new Rectangle(14, 124, 55, 18));
jLabel2.setText("Distance");
jLabel11 = new JLabel();
jLabel11.setBounds(new Rectangle(1, 72, 93, 16));
jLabel11.setText("End Coorinates");
jLabel1 = new JLabel();
jLabel1.setBounds(new Rectangle(0, 25, 98, 16));
jLabel1.setText("Start Coorinates");
jLabel = new JLabel();
jLabel.setBounds(new Rectangle(1, 155, 100, 16));
jLabel.setText("Time from Start:");
jContentPane = new JPanel();
jContentPane.setLayout(null);
jContentPane.add(getPanel(), null);
jContentPane.add(getJTextField_StartX(), null);
jContentPane.add(getJTextField_StartY(), null);
jContentPane.add(getJTextField_DestinationX(),  null);
jContentPane.add(getJTextField_DestinationY(), null);
jContentPane.add(getJButton_run(), null);
jContentPane.add(getJTextField_coordinates(), null);
jContentPane.add(getJTextField_time(), null);
jContentPane.add(getJButton_test(), null);
jContentPane.add(jLabel, null);
jContentPane.add(jLabel1, null);
jContentPane.add(jLabel11, null);
jContentPane.add(getJTextField_distance(), null);
jContentPane.add(jLabel2, null);
}
return jContentPane;
}
 
/**
 * This method initializes panel
 * 
 * @return java.awt.Panel
 */
private Panel getPanel() {
if (drawpanel == null) {
drawpanel = new DrawingPanel();
drawpanel.setLayout(null);
drawpanel.setBackground(new Color(205, 211, 255));
drawpanel.setSize(new Dimension(500, 500));
drawpanel.setMinimumSize(new Dimension(500, 500));
drawpanel.setMaximumSize(new Dimension(500, 500));
drawpanel.setLocation(new Point(160, 24));
drawpanel.addMouseMotionListener(new  java.awt.event.MouseMotionListener() {
public void mouseMoved(java.awt.event.MouseEvent e) {

e.getX();
e.getY();

String coordiX = Integer.toString(e.getX());  
String coordiY = Integer.toString(e.getY());  
//We get coordinates to the jtextfield when mouse is moving
jTextField_coordinates.setText("X:"+coordiX+" Y:"+coordiY);

}
public void mouseDragged(java.awt.event.MouseEvent e) {
}
});

}
return drawpanel;
}

/**
 * This method initializes jTextField_StartX
 * 
 * @return javax.swing.JTextField
 */
private JTextField getJTextField_StartX() {
if (jTextField_StartX == null) {
jTextField_StartX = new JTextField();
jTextField_StartX.setBounds(new Rectangle(23, 46, 39, 20));
}
return jTextField_StartX;
}
 
/**
 * This method initializes jTextField_StartY
 * 
 * @return javax.swing.JTextField
 */
private JTextField getJTextField_StartY() {
if (jTextField_StartY == null) {
jTextField_StartY = new JTextField();
jTextField_StartY.setLocation(new Point(69, 46));
jTextField_StartY.setSize(new Dimension(39, 20));
}
return jTextField_StartY;
}
 
/**
 * This method initializes jTextField_DestinationX
 * 
 * @return javax.swing.JTextField
 */
private JTextField getJTextField_DestinationX() {
if (jTextField_DestinationX == null) {
jTextField_DestinationX = new JTextField();
jTextField_DestinationX.setLocation(new Point(22, 92));
jTextField_DestinationX.setSize(new Dimension(39, 20));
}
return jTextField_DestinationX;
}
 
/**
 * This method initializes jTextField_DestinationY
 * 
 * @return javax.swing.JTextField
 */
private JTextField getJTextField_DestinationY() {
if (jTextField_DestinationY == null) {
jTextField_DestinationY = new JTextField();
jTextField_DestinationY.setLocation(new Point(69, 92));
jTextField_DestinationY.setSize(new Dimension(39, 20));
}
return jTextField_DestinationY;
}
 
/**
 * This method initializes jButton_run
 * 
 * @return javax.swing.JButton
 */
private JButton getJButton_run() {
if (jButton_run == null) {
jButton_run = new JButton();
jButton_run.setBounds(new Rectangle(23, 211, 76, 30));
jButton_run.setText("Run");
jButton_run.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
 
//when run button is pressed timer starts it saves second from beginning
//to Global variable secondFromBeginning

startTimer();
 
updateXPosition();

/*
 * Global variables(int) have to be converted to String
 * if we want them to the JTextFields
 */
String startX = Integer.toString(Global.gX1);  
String startY = Integer.toString(Global.gY1);  
String destinationX = Integer.toString(Global.gX2);  
String destinationY = Integer.toString(Global.gY2); 
String distance = Double.toString(Global.distance);

//set user selected coordinates to the jtextfields
jTextField_StartX.setText(startX);
jTextField_StartY.setText(startY);
jTextField_DestinationX.setText(destinationX);
jTextField_DestinationY.setText(destinationY);
jTextField_distance.setText(distance);

}
});
}
return jButton_run;
}
 
/**
 * This method initializes jTextField_coordinates
 * 
 * @return javax.swing.JTextField
 */
private JTextField getJTextField_coordinates() {
if (jTextField_coordinates == null) {
jTextField_coordinates = new JTextField();
jTextField_coordinates.setBounds(new Rectangle(30, 520, 105, 20));
jTextField_coordinates.setEditable(false);

}
return jTextField_coordinates;
}

public int getSecondOftheMoment(int arvo)
{
arvo=Global.secondFromBeginning;
return arvo;
}
 
public int getCurrentLocationX(int xb)
{
xb=Global.sailLocationX;
return xb;
}

public int getCurrentLocationY(int yb)
{
yb=Global.sailLocationY;
return yb;
}
 
/*
 *Timer method which saves seconds from beginning to the global *variable secondFromBeginning
 * 
 */
public void startTimer()
{
        ActionListener A = new ActionListener() 
        {
            public void actionPerformed(ActionEvent actionEvent)
            {
              Global.secondFromBeginning++;
            jTextField_time.setText(""+Global.secondFromBeginning);
               
            Global.sailLocationX=Global.sailLocationX+10;
            Global.sailLocationY=Global.sailLocationY+10;
 
//System.out.println("X:"+Global.sailLocationX+"\nY:"+Global.sailLocationY);
            
            }
          };
          Timer timer = new Timer(1000, A);
          timer.start();
}

/**
 * This method initializes jTextField_time
 * 
 * @return javax.swing.JTextField
 */
private JTextField getJTextField_time() {
if (jTextField_time == null) {
jTextField_time = new JTextField();
jTextField_time.setBounds(new Rectangle(100, 153, 54, 20));
}
return jTextField_time;
}
 
/**
 * This method initializes jButton_test
 * 
 * @return javax.swing.JButton
 */
private JButton getJButton_test() {
if (jButton_test == null) {
jButton_test = new JButton();
jButton_test.setBounds(new Rectangle(23, 251, 78, 21));
jButton_test.setPreferredSize(new Dimension(56, 26));
jButton_test.setText("TEST");
jButton_test.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {

///get second of this moment
int temp=0;
int thisSecond=0;
thisSecond=getSecondOftheMoment(temp);
System.out.println("Test: "+thisSecond);

}
});
}
return jButton_test;
}

/**
  * UpdateXPosition is for drawing to the panel
  * "you can see the boat moving". 
  */
    public void updateXPosition() {

Thread projectionThread = null;  
        //get the starting point
       //and put it to xx and yy variables which are used for moving
        Global.xx = Global.sailLocationX;
        Global.yy = Global.sailLocationY;
        
        //Coordinates where we must go X and Y
        
System.out.println("Destination coordinates X: "+Global.gX2+" Y: "+Global.gY2);
        
    
        
 Runnable miRunnable = new Runnable()
    {
 public void run()
            {

try
                    {
                            int index = 0;
                            while (true)
                            {
                           
                           
                //here we decide where to go!
                 //how to say go towards destination
                            Global.xx += 10;
                            Global.yy +=-10;
                                     
 //location of this moment.   
 System.out.println("positions in THREAD are:" + Global.xx + " and " + Global.yy);
                  
                            
            index++;
                            System.out.println("index "+index);
                            
                                    Thread.sleep(1000);                                 
                         
                                   
                            }
                    }
                    catch (Exception e) { e.printStackTrace(); }     
            }
 
 };
 
 if (projectionThread == null) {
         projectionThread = new Thread(miRunnable);
         projectionThread.start();
 } 
 
 }
 
/**
 * This method initializes jTextField_distance
 * 
 * @return javax.swing.JTextField
 */
private JTextField getJTextField_distance() {
if (jTextField_distance == null) {
jTextField_distance = new JTextField();
jTextField_distance.setBounds(new Rectangle(74, 125, 37, 20));
}
return jTextField_distance;
}
 
/**
 * Launches this application
 */
public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable() {
public void run() {
main application = new main();
application.getJFrame().setVisible(true);

}
});
}

}/// main class

/**
 * 
 *  This is panel for drawing. Must create another class to extending panel so we can override paint method
 */
class DrawingPanel extends Panel
{

/**
     * mouse listener to panel. constructor
     */
    public DrawingPanel() 
    {
    
MouseListener mouseListener = new DrawingMouseListener(this);
addMouseListener(mouseListener);

x1 = this.x1;
y1 = this.y1;
x2 = this.x2;
y2 = this.y2;

int horizontalX1=this.horizontalX1;
 int horizontalY1=this.horizontalY1;
 int horizontalX2=this.horizontalX2;
 int horizontalY2=this.horizontalY2;
 int verticalX1=this.verticalX1;
 int verticalY1=this.verticalY1;
 int verticalX2=this.verticalX2;
 int verticalY2=this.verticalY2;

}
  
    //avoid flickering override update and calls paint... no flickering!
    public void update(Graphics g) 
    {
      paint(g);
        g.setColor(Color.red);
 
    
        //starts do draw X to every second to direction (updateX())
    g.drawString("X",Global.xx, Global.yy);
    
    }  // update
    
    
    public void paint(Graphics g)
    {
 
  
g.drawString("Start",x1-8,y1-8);
g.drawLine(x1, y1, x2, y2); // Draw the line connecting two points
g.drawString("Destination",x2,y2);

//draws cross hair 
g.setColor(Color.blue);
g.drawLine(horizontalX1,horizontalY1,horizontalX2,horizontalY2);
g.drawLine(verticalX1,verticalY1,verticalX2,verticalY2);
g.setColor(Color.black);
 
//start location 
//we send start point to global variables sailLocationX, sailLocationY
//these variables acts only as first value givers in updateLocationX method

Global.sailLocationX=x1;
Global.sailLocationY=y1;
g.setColor(Color.red);

//length of the line
lineLength();
 
repaint();  
g.setColor(Color.black);

//coordinates
Global.gX1=x1;
Global.gY1=y1;
Global.gX2=x2;
Global.gY2=y2;
 
    }
 
    //Method that calculates distance between start and finnish
    public void lineLength () {
               
    //integer to double
    double xx1 = (double) x1 ;
    double yy1 = (double)(y1);
    double xx2 = (double)(x2);
    double yy2 = (double)(y2);
        
        
    //count length of the line
        double a,b,c;
         
        a=xx2-xx1;
        b=yy2-yy1;
        c=a*a+b*b;
        c=Math.sqrt(c);
        c=Math.round(c);
 
        Global.distance=c;      
    }

/**
     * First point eli alkupiste
     */
    public void setPoint1(int x, int y) {
x1 = x;
y1 = y;
repaint();
    }
 
    /**
     * End point
     */
    public void setPoint2(int x, int y) {
x2 = x;
y2 = y;
repaint();
    }
    
    public void currentLocation(int x, int y)
    {
    Global.gX1=x1;
    Global.gY1=y1;
    Global.sailLocationX = x1;
    Global.sailLocationY = y1;
    
    repaint();
    }
  
}

/**
 * A mouse listener for a DrawingPanel 
 */
class DrawingMouseListener extends MouseAdapter 
{
    DrawingPanel panel; // The panel to draw on
    boolean firstPress = true; // True when expecting first mouse press
 
    /**
     * Constructor 
     */
    public DrawingMouseListener(DrawingPanel panel)
    {
this.panel = panel;
    }
 
    /**
     * hiiren kuuntelija joka asettaa molemmat pisteet eka ja sitten toka
     * my�hemmin tulee muuten kolmas.
     * Asetettaan molemmat pisteet, eli kun eka kerran painaa hiirt�
     * niin eka ja sitten kun toisen kerran niin toka
     */
    public void mousePressed(MouseEvent e) {
if (firstPress) {
    panel.setPoint1(e.getX(), e.getY());
    panel.setPoint2(e.getX(), e.getY());
    
    firstPress = false;
} else {
    panel.setPoint2(e.getX(), e.getY());
    firstPress = true;
} 
    }
}

Class for Global variables
[code]

/* This class exist because it is easiest way to use "global" variables
*
*/
public class Global
{
// Must have some value at beginning otherwise main does not work as it should be
public static int gX1 = 5;
public static int gY1 = 5;
public static int gX2 = 5;
public static int gY2 = 5;
public static int secondFromBeginning = 0;

public static int sailLocationX = 10;
public static int sailLocationY = 10;

public static double distance = 0;

public static int counter=1;

public static int xx = 0;
public static int yy = 0;

}
[code]

Craig Wood

Ranch Hand

Posts: 1535

posted 17 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Tried to make minimal changes to answer your question, including:
Changed all class names to avoid name-clashing so you can run as-is.
Eliminated the updateXPosition and startTimer methods.
Made the Timer a member variable (class scope) and implemented ActionListener for
Main2 for the timer to use. Animation code is inside the actionPerformed method.
Changed DrawingPanel to a JPanel and eliminated its update method.

import java.awt.event.KeyEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Event;
import java.awt.BorderLayout;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.KeyStroke;
import java.awt.Point;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JMenuItem;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JFrame;
import javax.swing.JDialog;
import java.awt.*;
import java.awt.event.*;
import java.awt.Panel;
import java.awt.Rectangle;
import java.awt.GridBagLayout;
import java.awt.Dimension;
import javax.swing.border.BevelBorder; 
import javax.swing.BorderFactory;
 
import java.awt.Color;
import java.awt.Graphics; 
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseMotionAdapter;
import java.awt.Rectangle;
import javax.swing.JTextField;
import javax.swing.JButton; 
import java.util.GregorianCalendar;
import java.util.Calendar;
import java.util.Date;
import javax.swing.Timer.*;
import javax.swing.Timer;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import java.awt.BorderLayout;
import java.awt.Graphics;
import javax.swing.JFileChooser;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JToolBar;
import javax.swing.JButton;
import java.awt.GridBagLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import javax.swing.JLabel;
import java.util.Collections;
import java.util.Vector;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.SystemColor;
import java.awt.event.KeyEvent;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.Rectangle;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GraphicsConfiguration;
import java.awt.HeadlessException;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import java.lang.Object;
import java.text.DecimalFormat;
import java.util.*;
import java.awt.geom.Point2D;
 
public class Main2 extends JFrame implements ActionListener
{
 
        private JFrame jFrame = null;  
private JPanel jContentPane = null;
        private JPanel drawpanel = null;
   
        private JTextField jTextField_StartX = null;
private JTextField jTextField_StartY = null;
private JTextField jTextField_DestinationX = null;
private JTextField jTextField_DestinationY = null;
private JButton jButton_run = null;
private JTextField jTextField_coordinates = null;
JTextField jTextField_time = null;
private JButton jButton_test = null;
private JLabel jLabel = null;
private JLabel jLabel1 = null;
private JLabel jLabel11 = null;
private JTextField jTextField_distance = null;
private JLabel jLabel2 = null;
Timer timer = new Timer(1000, this);
 
public Main2() {
super("test drawing");
}
 
private JFrame getJFrame() 
{
if (jFrame == null) 
{
jFrame = new JFrame();
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jFrame.setSize(771, 605);
jFrame.setContentPane(getJContentPane());
jFrame.setTitle("MR. DrawMasta");
}
return jFrame;
}
 
/** 
 * This method initializes jContentPane
 */
private JPanel getJContentPane() {
if (jContentPane == null) {
jLabel2 = new JLabel();
jLabel2.setBounds(new Rectangle(14, 124, 55, 18));
jLabel2.setText("Distance");
jLabel11 = new JLabel();
jLabel11.setBounds(new Rectangle(1, 72, 93, 16));
jLabel11.setText("End Coorinates");
jLabel1 = new JLabel();
jLabel1.setBounds(new Rectangle(0, 25, 98, 16));
jLabel1.setText("Start Coorinates");
jLabel = new JLabel();
jLabel.setBounds(new Rectangle(1, 155, 100, 16));
jLabel.setText("Time from Start:");
jContentPane = new JPanel();
jContentPane.setLayout(null);
jContentPane.add(getPanel(), null);
jContentPane.add(getJTextField_StartX(), null);
jContentPane.add(getJTextField_StartY(), null);
jContentPane.add(getJTextField_DestinationX(),  null);
jContentPane.add(getJTextField_DestinationY(), null);
jContentPane.add(getJButton_run(), null);
jContentPane.add(getJTextField_coordinates(), null);
jContentPane.add(getJTextField_time(), null);
jContentPane.add(getJButton_test(), null);
jContentPane.add(jLabel, null);
jContentPane.add(jLabel1, null);
jContentPane.add(jLabel11, null);
jContentPane.add(getJTextField_distance(), null);
jContentPane.add(jLabel2, null);
}
return jContentPane;
}
 
/**
 * This method initializes panel
 * 
 * @return java.awt.Panel
 */
private JPanel getPanel() {
if (drawpanel == null) {
drawpanel = new DrawingPanel2();
drawpanel.setLayout(null);
drawpanel.setBackground(new Color(205, 211, 255));
drawpanel.setSize(new Dimension(500, 500));
drawpanel.setMinimumSize(new Dimension(500, 500));
drawpanel.setMaximumSize(new Dimension(500, 500));
drawpanel.setLocation(new Point(160, 24));
drawpanel.addMouseMotionListener(
new java.awt.event.MouseMotionAdapter() {
public void mouseMoved(java.awt.event.MouseEvent e) {
String coordiX = Integer.toString(e.getX());  
String coordiY = Integer.toString(e.getY());  
//We get coordinates to the jtextfield when mouse is moving
jTextField_coordinates.setText("X:"+coordiX+" Y:"+coordiY);
}
});
}
return drawpanel;
}
 
 
/**
 * This method initializes jTextField_StartX
 * 
 * @return javax.swing.JTextField
 */
private JTextField getJTextField_StartX() {
if (jTextField_StartX == null) {
jTextField_StartX = new JTextField();
jTextField_StartX.setBounds(new Rectangle(23, 46, 39, 20));
}
return jTextField_StartX;
}
 
/**
 * This method initializes jTextField_StartY
 * 
 * @return javax.swing.JTextField
 */
private JTextField getJTextField_StartY() {
if (jTextField_StartY == null) {
jTextField_StartY = new JTextField();
jTextField_StartY.setLocation(new Point(69, 46));
jTextField_StartY.setSize(new Dimension(39, 20));
}
return jTextField_StartY;
}
 
/**
 * This method initializes jTextField_DestinationX
 * 
 * @return javax.swing.JTextField
 */
private JTextField getJTextField_DestinationX() {
if (jTextField_DestinationX == null) {
jTextField_DestinationX = new JTextField();
jTextField_DestinationX.setLocation(new Point(22, 92));
jTextField_DestinationX.setSize(new Dimension(39, 20));
}
return jTextField_DestinationX;
}
 
/**
 * This method initializes jTextField_DestinationY
 * 
 * @return javax.swing.JTextField
 */
private JTextField getJTextField_DestinationY() {
if (jTextField_DestinationY == null) {
jTextField_DestinationY = new JTextField();
jTextField_DestinationY.setLocation(new Point(69, 92));
jTextField_DestinationY.setSize(new Dimension(39, 20));
}
return jTextField_DestinationY;
}
 
/**
 * This method initializes jButton_run
 * 
 * @return javax.swing.JButton
 */
private JButton getJButton_run() {
if (jButton_run == null) {
jButton_run = new JButton();
jButton_run.setBounds(new Rectangle(23, 211, 76, 30));
jButton_run.setText("Run");
jButton_run.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
 
//when run button is pressed timer starts it saves second from beginning
//to Global variable secondFromBeginning

timer.start();

/*
 * Global variables(int) have to be converted to String
 * if we want them to the JTextFields
 */
String startX = Integer.toString(Global2.gX1);  
String startY = Integer.toString(Global2.gY1);  
String destinationX = Integer.toString(Global2.gX2);  
String destinationY = Integer.toString(Global2.gY2); 
String distance = Double.toString(Global.distance);

}
return jTextField_coordinates;
}

public int getSecondOftheMoment(int arvo)
{
arvo=Global2.secondFromBeginning;
return arvo;
}
 
public int getCurrentLocationX(int xb)
{
xb=Global2.sailLocationX;
return xb;
}

public int getCurrentLocationY(int yb)
{
yb=Global2.sailLocationY;
return yb;
}
 
/*
 *Timer method which saves seconds from beginning to the global
 *variable secondFromBeginning
 * 
 */
    public void actionPerformed(ActionEvent actionEvent)
    {
        Global2.secondFromBeginning++;
        jTextField_time.setText(""+Global2.secondFromBeginning);
 
        int x1 = Global2.gX1;
        int y1 = Global2.gY1;
        int x2 = Global2.gX2;
        int y2 = Global2.gY2;
        double length = Point2D.distance(x1, y1, x2, y2);
        double theta = Math.atan2(y2-y1, x2-x1);
        //System.out.printf("theta = %.1f%n", Math.toDegrees(theta));
        // Assume we travel 5 px for each second
        int v = 5;
        // So total distance traveled along line will be
        int distTraveled = v*Global2.secondFromBeginning;
        // So the current location along the line of travel is
        Global2.xx = x1 + (distTraveled)*Math.cos(theta);
        Global2.yy = y1 + (distTraveled)*Math.sin(theta);
        if(distTraveled >= length)
            timer.stop();
        drawpanel.repaint();
 
//        Global.sailLocationX=Global.sailLocationX+10;
//        Global.sailLocationY=Global.sailLocationY+10;
//        System.out.println("X:"+Global.sailLocationX+"\nY:"+Global.sailLocationY);
            
}

///get second of this moment
int temp=0;
int thisSecond=0;
thisSecond=getSecondOftheMoment(temp);
System.out.println("Test: "+thisSecond);

}
});
}
return jButton_test;
}
 
/**
 * This method initializes jTextField_distance
 * 
 * @return javax.swing.JTextField
 */
private JTextField getJTextField_distance() {
if (jTextField_distance == null) {
jTextField_distance = new JTextField();
jTextField_distance.setBounds(new Rectangle(74, 125, 37, 20));
}
return jTextField_distance;
}
 
/**
 * Launches this application
 */
public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable() {
public void run() {
Main2 application = new Main2();
application.getJFrame().setVisible(true);

}
});
}

}/// main class
 
 
 
/**
 * 
 *  This is panel for drawing. Must create another class to extending panel so we can override paint method
 */
class DrawingPanel2 extends JPanel
{

///for drawing start to finnish
 int x1;
 int y1;
 int x2;
 int y2; // Start and end point of line
 
 ///for crosshair drawing
 int horizontalX1=0;
 int horizontalY1=250;
 int horizontalX2=500;
 int horizontalY2=250;
 int verticalX1=250;
 int verticalY1=0;
 int verticalX2=250;
 int verticalY2=500;
 
 
 
 
    /**
     * mouse listener to panel. constructor
     */
    public DrawingPanel2() 
    {
    
MouseListener mouseListener = new DrawingMouseListener2(this);
addMouseListener(mouseListener);

x1 = this.x1;
y1 = this.y1;
x2 = this.x2;
y2 = this.y2;

}
 
    protected void paintComponent(Graphics g)
    {
      super.paintComponent(g);
      Graphics2D g2 = (Graphics2D)g;
      g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                          RenderingHints.VALUE_ANTIALIAS_ON);
g.drawString("Start",x1-8,y1-8);
g.drawLine(x1, y1, x2, y2); // Draw the line connecting two points
      if(Math.abs(x1-x2) > 1 && Math.abs(y1-y2) > 1)
g.drawString("Destination",x2,y2);

Global.sailLocationX=x1;
Global.sailLocationY=y1;
g.setColor(Color.red);

//length of the line
lineLength();
 
//repaint();  
g.setColor(Color.black);

//coordinates
Global.gX1=x1;
Global.gY1=y1;
Global.gX2=x2;
Global.gY2=y2;
 */
    }
 /*
    //Method that calculates distance between start and finnish
    public void lineLength () {
               
    //integer to double
    double xx1 = (double) x1 ;
    double yy1 = (double)(y1);
    double xx2 = (double)(x2);
    double yy2 = (double)(y2);
        
        
    //count length of the line
        double a,b,c;
         
        a=xx2-xx1;
        b=yy2-yy1;
//        c=a*a+b*b;
        c=Math.sqrt(c);
        c=Math.round(c);
 
        Global2.distance=c;      
    }
*/
 
/**
     * First point eli alkupiste
     */
    public void setPoint1(int x, int y) {
x1 = x;
y1 = y;
repaint();
    }
 
    /**
     * End point
     */
    public void setPoint2(int x, int y) {
x2 = x;
y2 = y;
repaint();
    }
/*
    public void currentLocation(int x, int y)
    {
    Global2.gX1=x1;
    Global2.gY1=y1;
    Global2.sailLocationX = x1;
    Global2.sailLocationY = y1;
    
    repaint();
    }
*/
}
 
 
/**
 * A mouse listener for a DrawingPanel 
 */
class DrawingMouseListener2 extends MouseAdapter 
{
    DrawingPanel2 panel; // The panel to draw on
    boolean firstPress = true; // True when expecting first mouse press
 
    /**
     * Constructor 
     */
    public DrawingMouseListener2(DrawingPanel2 panel)
    {
this.panel = panel;
    }
 
    /**
     * hiiren kuuntelija joka asettaa molemmat pisteet eka ja sitten toka
     * my�hemmin tulee muuten kolmas.
     * Asetettaan molemmat pisteet, eli kun eka kerran painaa hiirt�
     * niin eka ja sitten kun toisen kerran niin toka
     */
    public void mousePressed(MouseEvent e) {
if (firstPress) {
    panel.setPoint1(e.getX(), e.getY());
    panel.setPoint2(e.getX(), e.getY());
          Global2.gX1=e.getX();
          Global2.gY1=e.getY();
          Global2.gX2=e.getX();
          Global2.gY2=e.getY();
          // Reset animation variables.
          Global2.secondFromBeginning = 0;
          Global2.xx = e.getX();
          Global2.yy = e.getY();
    
    firstPress = false;
} else {
    panel.setPoint2(e.getX(), e.getY());
          Global2.gX2=e.getX();
          Global2.gY2=e.getY();
    firstPress = true;
} 
    }
}
 
class Global2
{
// Must have some value at beginning otherwise main does not work as it should be
public static int gX1 = 5; 
public static int gY1 = 5;
public static int gX2 = 5;
public static int gY2 = 5;
public static int secondFromBeginning = 0;
 
public static int sailLocationX = 10;
public static int sailLocationY = 10;
 
public static double distance = 0;
 
public static int counter=1;

public static double xx = 0;
public static double yy = 0;

}

Maria Sachhause

Greenhorn

Posts: 10

posted 17 years ago

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Thank you, Craig Wood. You helped me a lot

Now I am trying to add one more point. Now if I press mouse twise I get two points(start and destination), but when I try to add third it does not work.

Below is how I try to do it, I don't get it why it doesn't work?

/**
 * 
 *  This is panel for drawing. Must create another class to extending panel so we can override paint method
 */
class DrawingPanel2 extends JPanel
{

///for drawing start to finnish
 int x1;
 int y1;
 int x2;
 int y2; // Start and end point of line
 int x3;
 int y3;
 
 
 ///for crosshair drawing
 int horizontalX1=0;
 int horizontalY1=250;
 int horizontalX2=500;
 int horizontalY2=250;
 int verticalX1=250;
 int verticalY1=0;
 int verticalX2=250;
 int verticalY2=500;
 
 
 
 
    /**
     * mouse listener to panel. constructor
     */
    public DrawingPanel2() 
    {
    
MouseListener mouseListener = new DrawingMouseListener2(this);
addMouseListener(mouseListener);

x1 = this.x1;
y1 = this.y1;
x2 = this.x2;
y2 = this.y2;
x3 = this.x3;
y3 = this.y3;

//draws cross hair 
g.setColor(Color.blue);
g.drawLine(horizontalX1,horizontalY1,horizontalX2,horizontalY2);
g.drawLine(verticalX1,verticalY1,verticalX2,verticalY2);
g.setColor(Color.black);
g.setColor(Color.red);
    g2.drawString("X", (float)Global2.xx, (float)Global2.yy);
 
    }
 
 
/**
     * First point eli alkupiste
     */
    public void setPoint1(int x, int y) {
x1 = x;
y1 = y;
repaint();
    }
 
    /**
     * End point
     */
    public void setPoint2(int x, int y) {
x2 = x;
y2 = y;
repaint();
    }
 
    public void setPoint3(int x, int y)
    {
    x3 = x;
    y3 = y;
    }
}
 
 
/**
 * A mouse listener for a DrawingPanel 
 */
class DrawingMouseListener2 extends MouseAdapter 
{
    DrawingPanel2 panel; // The panel to draw on
    
    boolean firstPress = true; // True when expecting first mouse press
    boolean secondPress = false;
    boolean thirdPress = false;
 
    /**
     * Constructor 
     */
    public DrawingMouseListener2(DrawingPanel2 panel)
    {
this.panel = panel;
    }
 
    
    /* Mouse listeners which set points
     *
     */
    public void mousePressed(MouseEvent e) {
if (firstPress) {
    panel.setPoint1(e.getX(), e.getY());
    panel.setPoint2(e.getX(), e.getY());
    panel.setPoint3(e.getX(), e.getY());
          Global2.gX1=e.getX();
          Global2.gY1=e.getY();
          Global2.gX2=e.getX();
          Global2.gY2=e.getY();
          // Reset animation variables.
          Global2.secondFromBeginning = 0;
          Global2.xx = e.getX();
          Global2.yy = e.getY();
    
    firstPress = false;
} 
else if(!firstPress)
{
    panel.setPoint2(e.getX(), e.getY());
          Global2.gX2=e.getX();
          Global2.gY2=e.getY();
    firstPress = true;
} 
else if(!firstPress || !secondPress)
{
 panel.setPoint3(e.getX(), e.getY());
 Global2.gX3 =e.getX();
 Global2.gX3 =e.getY();
}

}
}

[ October 30, 2007: Message edited by: Maria Sachhause ]

Craig Wood

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Posts: 1535

posted 17 years ago

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class DrawingPanel2 extends JPanel
{
    ///for drawing start to finnish
    int x1;
    int y1;
    int x2;
    int y2; // Start and end point of line
    int x3;
    int y3;
 
    ///for crosshair drawing
    int horizontalX1=0;
    int horizontalY1=250;
    int horizontalX2=500;
    int horizontalY2=250;
    int verticalX1=250;
    int verticalY1=0;
    int verticalX2=250;
    int verticalY2=500;
 
    public DrawingPanel2() 
    {
        MouseListener mouseListener = new DrawingMouseListener2(this);
        addMouseListener(mouseListener);
    }
 
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
  g.drawString("Start",x1-8,y1-8);
        g.drawLine(x1, y1, x2, y2); // Draw the line connecting two points
        if(Math.abs(x1-x2) > 1 && Math.abs(y1-y2) > 1)
            g.drawString("Destination",x2,y2);
        g.drawLine(x2, y2, x3, y3);
 
        //draws cross hair 
        g.setColor(Color.blue);
        g.drawLine(horizontalX1,horizontalY1,horizontalX2,horizontalY2);
        g.drawLine(verticalX1,verticalY1,verticalX2,verticalY2);
        g.setColor(Color.black);
        g.setColor(Color.red);
        g2.drawString("X", (float)Global2.xx, (float)Global2.yy);
    }
 
    public void setPoint1(int x, int y)
    {
        x1 = x;
        y1 = y;
        repaint();
    }
 
    public void setPoint2(int x, int y)
    {
        x2 = x;
        y2 = y;
        repaint();
    }
 
    public void setPoint3(int x, int y)
    {
        x3 = x;
        y3 = y;
        repaint();
    }
}
 
 
class DrawingMouseListener2 extends MouseAdapter 
{
    DrawingPanel2 panel; // The panel to draw on
 
    boolean firstPress = true; // True when expecting first mouse press
    boolean secondPress = true;
//    boolean thirdPress = false;
 
    public DrawingMouseListener2(DrawingPanel2 panel)
    {
        this.panel = panel;
    }
 
    public void mousePressed(MouseEvent e)
    {
        if (firstPress)
        {
            panel.setPoint1(e.getX(), e.getY());
            panel.setPoint2(e.getX(), e.getY());
            panel.setPoint3(e.getX(), e.getY());
            Global2.gX1=e.getX();
            Global2.gY1=e.getY();
            Global2.gX2=e.getX();
            Global2.gY2=e.getY();
            // Reset animation variables.
            Global2.secondFromBeginning = 0;
            Global2.xx = e.getX();
            Global2.yy = e.getY();
            firstPress = false;
        }
        else if(!firstPress && secondPress)
        {
            panel.setPoint2(e.getX(), e.getY());
            Global2.gX2=e.getX();
            Global2.gY2=e.getY();
            secondPress = false;
        } 
        else if(!firstPress && !secondPress)
        {
            panel.setPoint3(e.getX(), e.getY());
            Global2.gX3 =e.getX();
            Global2.gX3 =e.getY();
            firstPress = true;
            secondPress = true;
        }
    }
}

Maria Sachhause

Greenhorn

Posts: 10

posted 17 years ago

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Thanks again

You are really helping me

What if I want that third mouse pressing draws a line from given coordinate to the center?
So, I mean that if I want that first and second mouse press draws a line between those points like now it does but the third press draws a line from its coordinates toward center.

Should I do like this, where windSetLine x and y are global variables which tells where center is (250 and 250).
g.drawLine(x3, y3, Global2.windSetLineX,Global2.windSetLineY );

Craig Wood

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Posts: 1535

posted 17 years ago

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Should I do like this, where windSetLine x and y are global variables which tells where
center is (250 and 250).
Sounds like it would do what you want.

Maria Sachhause

Greenhorn

Posts: 10

posted 17 years ago

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Hi, few days have passed and new and last problem has risen.

Now I can make this.

step-by-step

1. First mouse press defines start point
2. Second mouse press defines destination point
3. Line is drawn between start and destination points
4. Third mouse press draws a line towards center

I have this coordinates: north is 0 and clockwise 360 degrees

-----------------360/0-------------------
-------------------*---------------------
270************************************90
-------------------*---------------------
-----------------180---------------------

And my problem is this:

-How can I draw a line from the start point towards degree 140 (which is hardcoded to for example to variable int heading=140)???

Craig Wood

Ranch Hand

Posts: 1535

posted 17 years ago

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// start at x1, y1
// destination at x2, y2
// third mouse click at x3, y3
// distance from start to third mouseClick
double distance = Point2D.distance(x1, y1, x3, y3);
// or use any arbitrary distance
// angle theta = 140 degrees expressed in radians
double theta = Math.toRadians(140);
// Angles in java are measured positive clockwise from
// zero at 3 o'clock. To start at 12 o'clock you can
// adjust theta by 90 degrees == Math.PI/2 as needed.
theta -= Math.PI/2;
double x = x1 + distance*Math.cos(theta);
double y = y1 + distance*Math.sin(theta);
// draw line from start to (x, y)
// it will have length = "distance" and a
// direction of 140 degrees from start to (x, y)
g.drawLine(x1, y1, x, y);

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