A Remote Compass- java source
Here is some source code in java for a remote compass display.
I wrote it so a cheap gps and old laptop could do something useful
in a plane. The cheap gps usually has no remote antenna, so the
gps is remoted to say, the window area.
It is a low budget version of the old style DG.
And the nice large display on the laptop can be placed someplace
for easy viewing.
I hope to have a Palm version soon. That way the computer could
be hungup on the window visor.
Although this source should compile directly for the Palm,
it requires the serial extensions that might conflict. It is set
for com2, 4800, 8, no parity, NEMA.
A spare electronic DG is the number one playtoy to try to make
a truely useful cockpit instrument in my mind.
Douglas Eagleson
Gaitherbsurg, MD USA
************************************************** *******
import java.awt.*;
import java.io.*;
import java.awt.event.*;
import javax.comm.*;
public class Compass2 extends Frame implements ActionListener {
static String title = "GPS Remote Compass";
boolean sentence=false;
boolean instring=false;
boolean valid;
float critlsum= (float) 1.0; //determines point where code is
displayed near the FIX
float one = (float) -1.0;
float zero = (float) 0.0;
int i;
int j;
String datatoo[] = new String[12];
int length;
int index[]=new int[13]; //number of commas in input string
int dash[]=new int[59];
int dart0[];
int dart1[];
int dart2[];
float lumsum[]=new float[3];
String data;
Label labelt;
Label labela;
Panel panel;
Panel panel2;
List list;
int countindex;
int jax;
Character doof;
String outs;
String outs1;
String outs2;
Integer ut;
int counter;
TextField t4;
TextField t5;
String Bottom;//display label string
TextField ltop;
TextField lbot;
protected static String BottomM=
"0|||||||350|||||||340|||||||330|||||||320|||||||3 10|||||||300|||||||290|||||||280|||||||270|||||||2 60|||||||250|||||||240|||||||230|||||||220|||||||2 10|||||||200|||||||190|||||||180|||||||170|||||||1 60|||||||150|||||||140|||||||130|||||||120|||||||1 10|||||||100|||||||090|||||||080|||||||070|||||||0 60|||||||050|||||||040|||||||030|||||||020|||||||0 10|||||||36";
protected static String Top = " | ";
private SerialPort sport;
InputStream inie;
BufferedInputStream in;
private CommPortIdentifier portid;
Integer bit;
int pig;
byte boll[];
String inn;
GridLayout layout;
int elix; //approach array index
public Compass2() {
System.out.println("initialize start");
this.setTitle(title);
//************************************************** ******************
try{
portid=
CommPortIdentifier.getPortIdentifier("COM2");
}catch(Exception e){System.out.println("error at
commportidentifier");}
try{
sport=
(SerialPort)portid.open("GPSchecklist",30000);
}catch(Exception e){System.out.println("error at open
port");}
try{
sport.setSerialPortParams(4800,8,1,0);
}catch(Exception dg){System.out.println("error at set
baud");}
try{
inie=sport.getInputStream();
in= new BufferedInputStream( inie, 1024 );
}catch(Exception e) {System.out.println("error at
input stream");}
System.out.println("comm initialized");
panel = new Panel();//main panel
Panel panel1 = new Panel();
Panel panel2 = new Panel();
Panel panel3 = new Panel();
//************************************************** **********
labelt=new Label("GPS Remote Compass");
labelt.setFont(new
Font("Times-Roman",Font.BOLD+Font.ITALIC,16));
GridLayout grid = new GridLayout(2,3,0,0);
panel2.setLayout(grid);
Label l4=new Label(" Speed");
l4.setFont(new Font("Monospaced",Font.BOLD,16));
Label l5=new Label("Knots.");
l5.setFont(new Font("Monospaced",Font.BOLD,16));
Label l6=new Label(" Track");
l6.setFont(new Font("Monospaced",Font.BOLD,16));
Label l7=new Label("Degrees");
l7.setFont(new Font("Monospaced",Font.BOLD,16));
t4=new TextField();
t4.setFont(new Font("Monospaced",Font.BOLD,16));
t5=new TextField();
t5.setFont(new Font("Monospaced",Font.BOLD,16));
panel2.add(l4);
panel2.add(t5);
panel2.add(l5);
panel2.add(l6);
panel2.add(t4);
panel2.add(l7);
//************************************************** *****************
GridLayout grid2 = new GridLayout(2,1,0,0);
panel1.setLayout(grid2);
ltop=new TextField("test",30);
ltop.setFont(new Font("Monospaced",Font.BOLD,16));
lbot=new TextField("tedd",30);
lbot.setFont(new Font("Monospaced",Font.BOLD,16));
panel1.add(ltop);
panel1.add(lbot);
//************************************************** ****************
Button off = new Button("Start");
off.addActionListener(this);
panel3.add(off);
//add action event source IF inside actionperformed to stop thread
//************************************************** *****************
panel.add(panel3);
panel.add(panel2);
panel.add(panel1);
// off.addActionListener(this);
System.out.println("A location");
this.add(panel);
this.setBounds(0,0,350,250);
this.setVisible(true);
panel.setVisible(true);
boll= new byte[1];
System.out.println("b location");
} //end of constructor
public static void main(String args[]) {
Compass2 check = new Compass2();
}
public void actionPerformed(ActionEvent e) {
boolean bwhil = true;
counter = 4; //sequence counter
while(bwhil){ //big while
countindex=0;
jax = 0;
float bogus2 = 1;
sentence = false;
instring=false;
valid=false;
while(valid==false){
while(sentence==false) {
instring=false;
data= new String("");
while(instring==false) {
try {
pig=in.read();
bit = new Integer(pig);
boll[0] = bit.byteValue();
}catch(Exception he) {
}
if(pig == 13) instring = true;
inn = new String(boll);
data = data + inn;
} // end of inner while
if(data.substring(1,7).equals("$GPRMC") )
sentence=true;
} // end of while
valid=true;
length=data.length();
for(i=0; ilength; i++) {
if (data.substring(i,i+1).equals(",")) {
index[jax]=i;
jax=jax+1;
}
if( jax == 13) {
i= length;
valid=false;
}
//adjust index[] array size to match the input sentence, number of
"commas".
}
} // end valid while
index[10]=length;
for(j=0;j10;j++){
datatoo[j]=new
String(data.substring((index[j]+1),index[j+1]) );
// [j]+1 is an inclusive index, while the end of the
substring is exclusive
}
t4.setText(datatoo[7]);
t5.setText(datatoo[6]);
Float f = new Float(datatoo[7]);
int heading = f.intValue();
heading= -1*(heading-360);
if ((heading = 344) && (heading = 15)) {
Bottom = BottomM.substring( (heading-15), (heading+15) );
};
if((heading 344) && (heading=360)){
Bottom = BottomM.substring( (heading-15) , 360);
Bottom=Bottom+BottomM.substring( 0, (15-(360-heading)) );
};
if((heading 15) && (heading0)){
Bottom = BottomM.substring( (360-15+heading) , 360);
Bottom=Bottom+BottomM.substring( 0, (heading+15) );
};
ltop.setText(Top);
lbot.setText(Bottom);
//************************************************** ********************
} //end of big while
} //end of action event
} //end of class
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