Help with lag in program

This is my first time posting and I am new to LabVIEW. I took the NI Basic and Intermediate courses and now I am the "expert" at work. When I run my program, the plots are fine but when I start writing to a file there is a lot of lag on the plots. I do not know what the 'actual' problem is and what I should do to fix it.
I created a program to read 12 Analog Voltage inputs and plot them and also write to file.
I am using LabVIEW 11, 32-bit on Windows XP
DAQ Hardware: 0-10Volt signals from pressure transducers -> NI 9205 -> NIcDAQ-9174
Thanks,
Chris
Attachments:
WaveTest_1.5.vi ‏243 KB

Vastly superior! Here's your first Kudos for the effort!
Let my make a couple suggestions and then I'll try to answer your questions.
you have almost no code in case 0 its just there to init FP values you may be better served to remove the stacked sequence and replace all code in case0 with a invoke node and run the method "Default Values:Reintialize All To Default" (Select Class. VI Server>VI>VI) if you leave the referance input unwired the invoke node assumes "This VI" and should operate as desired.
Implementing the above- the event loop is allways ready to service events- If you do not chose to remove the sequence structure consider moving the event loop outside the sequence structure.
There is no reason to enqueue default data (might even be bad) push the enqueue inside the case with the DAQ assistant
2) Writing to a terminal, local or value property node does not cause a value change event. VCEs are only generated by user interaction that changes a value or writing to a value(signaling) property node NOTE: Value(Signaling) Allways fires the VC event even if you write the existing value (These points burn developers every day- we almost all have learned them the hard way)
1)This will have to be done by splitting and merging the signals into "channel groups" that can be built into an array
Jeff

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import java.awt.*;
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Edited by: syder on Mar 14, 2008 2:26 AM

Like said before, do one thing at a time. At startup, something like:
//put all the content in a list
ArrayList<String> lines = new ArrayList<String>();
while(String line=rand.readLine()!=null) {
 lines.add(line);
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static final int ENTRY_SIZE = 3;//you have 3 fields now, better to have a constant if that changes
ArrayList<Entry> entries = new ArrayList<Entry>();
for(int i=0; i<lines.size(); i+=ENTRY_SIZE) {
 Entry entry = new Entry(lines.get(i), lines.get(i+1), lines.get(i+2);
 entries.add(newEntry);
}You could also do both of the above in one run, but I think you will understand better what's happening if you do one thing at a time.
If you don't want to put the entries in an encapsulating class, you can still access this without looping:
int listStartIdx = <desired_entry_index>*ENTRY_SIZE;
String att1 = lines.get(listStartIdx).substring(1);
String att2 = lines.get(listStartIdx+1).substring(1);
String att3 = lines.get(listStartIdx+2).substring(1);

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^

edit: figured it out... please delete post
Message was edited by:
afroryan58

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Regards,
Tim

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another question is how do I ask a question like want to try again (y/n) after a output and asking that everytime I type in yes after a output and terminate when saying No.Sun's [basic Java tutorial|http://java.sun.com/docs/books/tutorial/]
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thanks to all.
2. HTML Java Source Code Reserved Word Highlighter
Write a program that inputs a Java source code file and outputs a copy of that file with Java keywords surrounded with HTML tags for bold type. For example this input:
public class JavaSource
public static void main ( String[] args )
if ( args.length == 3 )
new BigObject();
else
System.out.println("Too few arguments.");
will be transformed into:
public class JavaSource
public static void main ( String[] args )
if ( args.length == 3 )
new BigObject();
else
System.out.println("Too few arguments.");
In a browser the code will look like this:
public class JavaSource
public static void main ( String[] args )
if ( args.length == 3 )
new BigObject();
else
System.out.println("Too few arguments.");

Here is something that may get you started...
import java.io.*;
import java.util.*;
public class HtmlJava{
 public static void main(String arg[]){
 if(arg.length!=1){
 System.out.println("Usage java HtmlJava sourceFile");
 else
 new HtmlJava(arg[0]);
 HtmlJava(String source){
 try{
 BufferedReader sourceReader=new BufferedReader(new InputStreamReader(new FileInputStream(source)));
 BufferedWriter writer=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(source+"Html.txt")));
 Vector keywords=new Vector();
 addKeywords(keywords);
 String line;
 StringTokenizer tokenizer=null;
 String word;
 while((line=sourceReader.readLine () )!=null){
 tokenizer=new StringTokenizer(line);
 while(tokenizer.hasMoreTokens()){
 word=tokenizer.nextToken();
 if(keywords.contains(word)){
 writer.write(""+word+" ");
 else{
 writer.write(word+" ");
 writer.write("\r\n");
 writer.close();
 sourceReader.close();
 System.out.println("Output File written to "+source+"Html.txt");
 catch(Exception ex){
 ex.printStackTrace();
 private void addKeywords(Vector keywords){
 keywords.addElement ( "abstract");
 keywords.addElement( "boolean");
 keywords.addElement( "break");
 keywords.addElement( "byte");
 keywords.addElement( "byvalue");
 keywords.addElement( "case");
 keywords.addElement( "cast");
 keywords.addElement( "catch");
 keywords.addElement( "char");
 keywords.addElement( "class");
 keywords.addElement( "const");
 keywords.addElement( "continue");
 keywords.addElement( "default");
 keywords.addElement( "do");
 keywords.addElement( "double");
 keywords.addElement( "else");
 keywords.addElement( "extends");
 keywords.addElement( "false");
 keywords.addElement( "final");
 keywords.addElement( "finally");
 keywords.addElement( "float");
 keywords.addElement( "for");
 keywords.addElement( "future");
 keywords.addElement( "generic");
 keywords.addElement( "goto");
 keywords.addElement( "if");
 keywords.addElement( "implements");
 keywords.addElement( "import");
 keywords.addElement( "inner");
 keywords.addElement( "instanceof");
 keywords.addElement( "int");
 keywords.addElement( "interface");
 keywords.addElement( "long");
 keywords.addElement( "native");
 keywords.addElement( "new");
 keywords.addElement( "null");
 keywords.addElement( "operator");
 keywords.addElement( "outer");
 keywords.addElement( "package");
 keywords.addElement( "private");
 keywords.addElement( "protected");
 keywords.addElement( "public");
 keywords.addElement( "rest");
 keywords.addElement( "return");
 keywords.addElement( "short");
 keywords.addElement( "static");
 keywords.addElement( "super");
 keywords.addElement( "switch");
 keywords.addElement( "synchronized");
 keywords.addElement( "this");
 keywords.addElement( "throw");
 keywords.addElement( "throws");
 keywords.addElement( "transient");
 keywords.addElement( "true");
 keywords.addElement( "try");
 keywords.addElement( "var");
 keywords.addElement( "void");
 keywords.addElement( "volatile");
 keywords.addElement( "while");
}Hope it helped

Help with an array program

I can't see how to calculate the lowest hours, highest hours, and average hours worked.
These three values should be outputted each on a seperate line.
I just can't figure this out.
Any help please.
This program will show the employees
hours. It will have one
class.It will use an array to keep
track of the number of hours the employee
has worked with the output to the monitor
of the employees highest, lowest, and the
average of all hours entered. */
import java.util.*;
import java.text.DecimalFormat;
/*** Import Decimal Formating hours to format hours average. ***/
public class cs219Arrays
 public static void main(String[] args)
 Scanner scannerObject = new Scanner(System.in);
 int[] employees ={20, 35, 40};
 int employeesHighest = 40;
 int employeesLowest = 20;
 double employeesAverage = 35;
 int[] firstEmployee = new int[1];
 int[] secondEmployee = new int[2];
 int[] thirdEmployee = new int[3];
 System.out.println("This program will accept hours worked for 3 employees.");
 System.out.println("Enter hours worked for employee #: ");
 System.out.println(".\n");
 employeesAverage = scannerObject.nextInt();
 for(int count =20; count <= 40; count++)
 DecimalFormat df = new DecimalFormat("0.00");
 System.out.println("pay: " employeesAverage " lowest " employeesHighest " Highest hours " employeesLowest " Lowest hours "+df.format(employeesAverage));
 System.out.print("\n");
 employeesAverage++;
}/* end of body of first for loop */
 for(int count =20; count <= 40; count++)
 employeesAverage = employeesAverage + employeesHighest + employeesLowest;
 DecimalFormat df = new DecimalFormat("0.00");
 System.out.println("pay: $" employeesAverage " lowest " employeesHighest " Highest hours $" +df.format(employeesAverage));
 System.out.print("\n");
 employeesAverage++;
}/* end of body of second for loop */
 for(int count =20; count <= 40; count++)
 employeesAverage = employeesAverage + employeesHighest + employeesLowest;
 DecimalFormat df = new DecimalFormat("0.00");
 System.out.println("pay: $" employeesAverage " lowest " employeesHighest " Highest hours $" +df.format(employeesAverage));
 System.out.print("\n");
 employeesAverage++;
}/* end of body of third for loop */
 System.out.println("\n");
 DecimalFormat twoDigits = new DecimalFormat("0.00");
 /*** Create new DecimalFormat object named twoDigits ***/
 /*Displays number of hours, employees hours and average hours.*/
 System.out.println("You entered " + employeesAverage + " number of hours.");
 System.out.println("Your number of hours are " + twoDigits.format(employeesAverage));
 System.out.println("\n\n");
} /*End of method for data.*/
{ /*Main method.*/
} /*End of main method.*/
} /*End of class cs219Arrays.*/

Want help?
Use the code formatting tags for starters. http://forum.java.sun.com/help.jspa?sec=formatting

Help with some Java Programs

Hi all ..
i am a new in Java and i need some help with my School Project ,,,
Will you help me ??
regards,
Toota

People here will answer questions and comment on your code, but don't ecpect them to debug your source nor do your homework for you.

Need help with accessing the program.

I need help with accessing my adobe creative cloud on my windows 8.1 laptop. I have an account but do not have an app. I need this for my online classes. Please help!

Link for Download & Install & Setup & Activation may help
-Chat http://www.adobe.com/support/download-install/supportinfo/

Help with RFC sender, Program And RFC Destination

Hi!!
my scenary is asynchronous
 RFC Sender -> SAP-XI -> Oracle reciever
I have a problem with abap, especially rfc, program and rfc destination. The connection with SAP-XI exist and SAP-XI receive the message but the message is empty.
1. In my program on the line
 CALL FUNCTION 'ZBAPI_SD_PED_ORD_SERVIC' DESTINATION 'ZXI_ENVIAR_PED_ORD_SERVIC'
 catch an error system_failure = 2 and it dont execute the rfc ZBAPI_SD_PED_ORD_SERVIC
2. I rewrite my program, that line to
 CALL FUNCTION 'ZBAPI_SD_PED_ORD_SERVIC' STARTING NEW TASK 'NEW' DESTINATION 'ZXI_ENVIAR_PED_ORD_SERVIC'
 catch an error communication_failure = 1 but the rfc ZBAPI_SD_PED_ORD_SERVIC is executed but no send to SAP-XI
3. I rewrite my program, that line to
 CALL FUNCTION 'ZBAPI_SD_PED_ORD_SERVIC' IN BACKGROUND TASK DESTINATION 'ZXI_ENVIAR_PED_ORD_SERVIC'
 No error but it dont execute the rfc ZBAPI_SD_PED_ORD_SERVIC and the message in SAP-XI is empty, display the tables but not the row. i check the table PED_ORDEN and RETURN but the controls fields dont are afected.
What is my Error?
Where am i making a mistake?
RFC
FUNCTION zbapi_sd_ped_ord_servic.
*"Interfase local
*" TABLES
*" PED_ORDEN STRUCTURE ZSD_RFC_T04
*" RETURN STRUCTURE ZSD_RFC_R06
TABLES: zsd_ped_orden, zsd_rfc_r01.
DATA: tb_ped_orden LIKE zsd_ped_orden OCCURS 0 WITH HEADER LINE,
 tb_rfc_orden_error LIKE zsd_rfc_r01 OCCURS 0 WITH HEADER LINE.
*Get Pedido by Ordenes
SELECT * INTO CORRESPONDING FIELDS OF TABLE tb_ped_orden
 FROM zsd_ped_orden
 WHERE estatus EQ space.
LOOP AT tb_ped_orden.
 MOVE-CORRESPONDING tb_ped_orden TO ped_orden.
 APPEND ped_orden.
 tb_ped_orden-estatus = 'X'.
 tb_ped_orden-fecha_actualiz = sy-datum.
 tb_ped_orden-hora_actualiz = sy-uzeit.
 MODIFY tb_ped_orden.
ENDLOOP.
MODIFY zsd_ped_orden FROM TABLE tb_ped_orden.
COMMIT WORK.
*Errors in Ordenes
SELECT * INTO CORRESPONDING FIELDS OF TABLE tb_rfc_orden_error
 FROM zsd_rfc_r01
 WHERE estatus EQ space.
LOOP AT tb_rfc_orden_error.
 MOVE-CORRESPONDING tb_rfc_orden_error TO return.
 APPEND return.
 tb_rfc_orden_error-estatus = 'X'.
 tb_rfc_orden_error-fecha_actualiz = sy-datum.
 tb_rfc_orden_error-hora_actualiz = sy-uzeit.
 MODIFY tb_rfc_orden_error.
ENDLOOP.
MODIFY zsd_rfc_r01 FROM TABLE tb_rfc_orden_error.
COMMIT WORK.
ENDFUNCTION.
PROGRAM
REPORT ZBAPI_SD_PED_ORD_SERVIC.
DATA: ped_orden LIKE ZSD_RFC_T04 OCCURS 0 WITH HEADER LINE,
 return LIKE ZSD_RFC_R06 OCCURS 0 WITH HEADER LINE.
CALL FUNCTION 'ZBAPI_SD_PED_ORD_SERVIC' DESTINATION 'ZXI_ENVIAR_PED_ORD_SERVIC'
 TABLES
 ped_orden = ped_orden
 return = return
EXCEPTIONS
 communication_failure = 1
 system_failure = 2
 OTHERS = 3.
IF sy-subrc <> 0.
MESSAGE 'error' type 'I'.
ENDIF.
COMMIT WORK.
RFC DESTINATION
RFC Destination: ZXI_ENVIAR_PED_ORD_SERVIC
Connection TYpe: TCP/IP Connection
Register Server Program: ZBAPI_SD_PED_ORD_SERVIC
Gateway host: host00
Gateway service: sapgw00

hi
For rfc sender adapter we hv to do some settings .Please chk whether this settings are well configured or not.
a) RFC destination
b) RFC channel in the XI directory
This weblog is a response to a few question about the basic configuration of the RFC sender adapter
that were posted on the XI forum (and also on my e-mail)
So here we go, basically we have to configure 2 things:
a) RFC destination
b) RFC channel in the XI directory
RFC destination:
1. To create the RFC go to TCODE: SM59
2. Create new destination of type T (TCP/IP)
3. Make sure you select Registered Server Program option before writing your program ID
4. Write you program ID (remember it's case-sensitive)
5. In the gateway host and gateway service write the values of your "Application system" - business system (not the XI server)
7. No configuration in the J2EE administrator nessecary
Now we can proceed to RFC channel configuration:
1. Enter your Application Server
2. Your Application Server Service
3. Enter your Program ID from the RFC destination
And we're done:)
Now you can test the RFC destination in SM59 to see if it works.
Please chk this following link.
1. RFC Processing with the RFC Adapter
http://help.sap.com/saphelp_nw04/helpdata/en/25/76cd3bae738826e10000000a11402f/content.htm
2. Configuring the Sender RFC Adapter -
http://help.sap.com/saphelp_nw04/helpdata/en/67/6d0540ba5ee569e10000000a155106/content.htm
3. /people/swaroopa.vishwanath/blog/2006/12/28/send-rfc-to-sap-xi-150-asynchronous
regards
Manas

Need Help with a JAVA programming assignment

How do I write a JAVA program that could be used as the start of an MS-DOS/Windows simulation of the IEEE 802.3 protocol? I am to only code the parts necessary to build the 802.3 frame. For the initial implementation, the Checksum function need not be a CRC function, and the Destination and Source addresses wil be in input, stored, and output, and in dotted-decimal format.
I need:
1. A record to describe the frame, with each field being a (byte-) string of the required size, except that the Data field is of variable size. Although the "Source address" and "Destination address" would be 6 bytes for a real implementation, for this first implementation you can either assume they'll be text strings in the usual "dotted decimal" form (e.g. "14.04.05.18.01.25" as a typical example--from Tanenbaum, p. 429), or 6 hex digits.
2. Suitable constant declarations for values such as the standard "Preamble" and "Start of Frame" values.
3. Suitable functions to Get the three variable values "Destination address", "Source address", and "Data" from the standard input device.
4. A suitable function to display each of the fields of a given frame in a format such as:
Preamble: ...
StartofFrame: ...
Destination: ...
etc.
5. A suitable function to generate a "Pad" field if necessary.
6. A "dummy" Checksum-generating function which just takes the first 32 bits (4 bytes) of the Data (or Data+Pad, if necessary) rather than an actual CRC algorithm.
I have no experience with Java. Can you help me or start me in the right direction?
Thanks...........TK

If you have no experience with Java, then it seems to me your first step should be to start learning the language. But it's difficult to advise how, since we don't know anything about your background. There are many good books available on Java, some are for beginners and some are for advanced programmers, so I'd suggest you go somewhere that has a large selection and start looking for something that doesn't seem completely over your head.

Need Help with simple array program!

Hi, I have just recently started how to use arrays[] in Java and I'm a bit confused and need help designing a program.
What this program does, it reads in a range of letters specified by the user. The user then enters the letters (a, b or c) and stores these characters into an array, which the array's length is equal to the input range the user would enter at the start of the program. The program is then meant to find how many times (a,b and c) appears in the array and the Index it first appears at, then prints these results.
Here is my Code for the program, hopefully this would make sense of what my program is suppose to do.
import B102.*;
class Letters
 static int GetSize()
 int size = 0;
 boolean err = true;
 while(err == true)
 Screen.out.println("How Many Letters would you like to read in?");
 size = Keybd.in.readInt();
 err = Keybd.in.fail();
 Keybd.in.clearError();
 if(size <= 0)
 err = true;
 Screen.out.println("Invalid Input");
 return(size);
 static char[] ReadInput(int size)
 char input;
 char[] letter = new char[size];
 for(int start = 1; start <= size; start++)
 System.out.println("Please enter a letter (a, b or c) ("+size+" max), enter # to stop:");
 input = Keybd.in.readChar();
 while((input != 'a') && (input != 'b') && (input != 'c') && (input != '#'))
 Screen.out.println("Invalid Input");
 System.out.println("Please enter a letter (a, b or c) ("+size+" max, enter # to stop:");
 input = Keybd.in.readChar();
 while(input == '#')
 start == size;
 break;
 for(int i = 0; i < letter.length; i++)
 letter[i] = input;
 return(letter);
 static int CountA(char[] letter)
 int acount = 0;
 for(int i = 0; i < letter.length; i++)
 if(letter[i] == 'a')
 acount++;
 return(acount);
 static int CountB(char[] letter)
 int bcount = 0;
 for(int i = 0; i < letter.length; i++)
 if(letter[i] == 'b')
 bcount++;
 return(bcount);
 static int CountC(char[] letter)
 int ccount = 0;
 for(int i = 0; i < letter.length; i++)
 if(letter[i] == 'c')
 ccount++;
 return(ccount);
 static int SearchA(char[] letter)
 int ia;
 for(ia = 0; ia < letter.length; ia++)
 if(letter[ia] == 'a')
 return(ia);
 return(ia);
 static int SearchB(char[] letter)
 int ib;
 for(ib = 0; ib < letter.length; ib++)
 if(letter[ib] == 'b')
 return(ib);
 return(ib);
 static int SearchC(char[] letter)
 int ic;
 for(ic = 0; ic < letter.length; ic++)
 if(letter[ic] == 'c')
 return(ic);
 return(ic);
 static void PrintResult(char[] letter, int acount, int bcount, int ccount, int ia, int ib, int ic)
 if(ia <= 1)
 System.out.println("There are "+acount+" a's found, first appearing at index "+ia);
 else
 System.out.println("There are no a's found");
 if(ib <= 1)
 System.out.println("There are "+bcount+" b's found, first appearing at index "+ib);
 else
 System.out.println("There are no b's found");
 if(ic <= 1)
 System.out.println("There are "+ccount+" c's found, first appearing at index "+ic);
 else
 System.out.println("There are no c's found");
 return;
 public static void main(String args[])
 int size;
 char[] letter;
 int acount;
 int bcount;
 int ccount;
 int ia;
 int ib;
 int ic;
 size = GetSize();
 letter = ReadInput(size);
 acount = CountA(letter);
 bcount = CountB(letter);
 ccount = CountC(letter);
 ia = SearchA(letter);
 ib = SearchB(letter);
 ic = SearchC(letter);
 PrintResult(letter, acount, bcount, ccount, ia, ib, ic);
 return;
} Some errors i get with my program are:
When reading in the letters to store into the array, I get the last letter I entered placed into the entire array. Also I believe my code to find the Index is incorrect.
Example Testing: How many letters would you like to read? 3
Enter letter (a, b or c) (# to quit): a
Enter letter (a, b or c) (# to quit): b
Enter letter (a, b or c) (# to quit): c
It prints "There are no a's'" (there should be 1 a at index 0)
"There are no b's" (there should be 1 b at index 1)
and "There are 3 c's, first appearing at index 0" ( there should be 1 c at index 2)
The last thing is that my code for when the user enters "#" that the input of letters would stop and the program would then continue over to the counting and searching part for the letters, my I believe is correct but I get the same problem as stated above where the program takes the character "#" and stores it into the entire array.
Example Testing:How many letters would you like to read? 3
Enter letter (a, b or c) (# to quit): a
Enter letter (a, b or c) (# to quit): #
It prints "There are no a's'" (should have been 1 a at index 0)
"There are no b's"
and "There are no c's"
Can someone please help me??? or does anyone have a program simular to this they have done and would'nt mind showing me how it works?
Thanks
lou87.

Without thinking too much...something like this
for(int start = 0; start < size; start++) {
 System.out.println("Please enter a letter (a, b or c) ("+size+" max), enter # to stop:");
 input = Keybd.in.readChar();
 while((input != 'a') && (input != 'b') && (input != 'c') && (input != '#')) {
 Screen.out.println("Invalid Input");
 System.out.println("Please enter a letter (a, b or c) ("+size+" max, enter # to stop:");
 input = Keybd.in.readChar();
 if(input == '#') {
 break;
 letter[start] = input;
 }you dont even need to do start = size; coz with the break you go out of the for loop.

Re: Help with Java school program

Hi, I've been trying to figure out how to make my DoubleCanvas java program to work. What I'm supposed to do is have a left canvas and a right canvas. In the middle of the applet is a button panel that can select to either draw on the left, right, or both canvases. We have a main DoubleCanvas applet class, then each canvas is drawn from a MyCanvas class. My problem is I don't know how to switch from one canvas to the other canvas from the MyCanvas class.
Any help would be much appreciated. Thanks. :)

Hi, sorry. I didn't want to clutter the page with stuff that might be wrong. This is my DoubleCanvas applet class in the works. I'm not sure I did the listeners correct. And I haven't gotten to add the Checkbox event stuff in the MyCanvas class in yet, because I don't know how to make the checkboxes activate a particular canvas. If you feel I should post the MyCanvas class please let me know, it's somewhat long.
DoubleCanvas class
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.lang.*;
import java.math.*;
public class DoubleCanvas extends Applet
// ---- class and instance objects ----
private Panel button_panel;
private MyCanvas drawing_canvas1, drawing_canvas2;
private CheckboxGroup canvas;
private Checkbox left, right, both;
private Choice color_choices;
private Button undo_but, redo_but, erase_but;
public void init()
color_choices = new Choice();
color_choices.add("white");
color_choices.add("yellow");
color_choices.add("gray");
color_choices.add("magenta");
erase_but = new Button("erase");
undo_but = new Button("undo");
redo_but = new Button("redo");
canvas = new CheckboxGroup();
left = new Checkbox ( "<-", true, canvas );
right = new Checkbox ( "->", false, canvas );
both = new Checkbox ( "<->", false, canvas );
button_panel = new Panel();
drawing_canvas1 = new MyCanvas();
drawing_canvas2 = new MyCanvas();
drawing_canvas1.setBackground(Color.black);
drawing_canvas2.setBackground(Color.black);
setLayout( new GridLayout(1,3) );
button_panel.setLayout( new GridLayout(7,1) );
button_panel.add( left );
button_panel.add( right );
button_panel.add( both );
button_panel.add( color_choices );
button_panel.add( erase_but );
button_panel.add( undo_but );
button_panel.add( redo_but );
add( drawing_canvas1 );
add( button_panel );
add( drawing_canvas2 );
left.addItemListener( drawing_canvas1 );
right.addItemListener( drawing_canvas1 );
both.addItemListener( drawing_canvas1 );
color_choices.addItemListener( drawing_canvas1 );
erase_but.addActionListener( drawing_canvas1);
undo_but.addActionListener( drawing_canvas1 );
redo_but.addActionListener( drawing_canvas1 );
public void paint( Graphics g ) {

Help with lag in program

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