I promised I searched this and I'm sure the answer is easy, but how to I find out how much a shape it rotated?

I've created a shape called "knob" and every time you click the mouse it rotates .25 radians:
void mousePressed()
{
  knob.rotate(.25);
}

What I'd like to do is store the current amount of rotation is to a variable then println() the amount with every click. Something along these lines (this is wrong obviously):
void mousePressed()
{
  knob.rotate(1);
  rotateVar = knob.rotation();
  println(rotateVar);
}

Thanks,
Shields

hello again,

quick question. i know I can check to see if an array as a whole is, or isn't, null:

1. String[] vals;
2. if(vals == null)
3. {
4. //do something
5. }

but how can i check if a particular slot in an array is empty or even exists? for example (this is wrong but gets across what i'm asking):

1. String[] vals;
   
2. if(vals[1] == null)//and there is something at [1]
3. {
4. //do something else
5. }

the error i get is:

The operator == is undefined for the argument types(s) int, null

What is the proper way to check to see if is [1] even exists?
Thank you,
Shields

by the way, this doesn't really relate to a bigger project. I'm just playing with a simple program to learn more, and get better, with Processing.

So, I'm working on a project using Processing running on a Raspberry Pi with an Arduino attached to that. So far, by following these tutorials:
http://scruss.com/blog/2012/08/12/controlling-an-arduino-from-raspberry-pi-using-processing/
http://cagewebdev.com/index.php/raspberry-pi-running-processing-on-your-raspi/
I've gotten Processing to run on my Pi (so as hell, but that's okay. The Pi allows for more mobile flexibility (as in the arduino isn't as chained to my laptop. not cell phone / tablet mobile) so it's worth it).

So i've gotten a couple programs to run (all of the java issues needed to be ironed out) such as a simple "Hello World" and one that sends a tweet. But I can't seem to get anything that utilizes Serial, such as

In the first link, in those instructions, it says:

5. In the Processing folder, remove or rename modes/java/libraries/serial/library/linux32/librxtxSerial.so; it’s an x86 binary, and will fail

Which I did. And for your reference, I have included

1. import processing.serial.*;

but when i run any of the Serial aspects of Processing, nothing happens. For example, if I run

1. println(Serial.list());
2. println("hello everybody");

"hello everybody" will print on the screen, but the Serial.list() is ignored. No errors. Just ignored. I think that this is why I'm having issues getting my Arduino to be part of the equations since my program uses Serial communication between Processing and the board.

Any tips/tricks/help would be great. I'm fairly new to Linux and even newer to Pi, so my apologies if this is a lame-noob question. But thanks in advance all the same.

Shields

i'm writing a program that scours my twitter feed for relevant tweets (which it does just fine). However it's suppose to display the tweets on the screen... which it does kind of.

At  the beginning of my program, i define these variables (they aren't the only ones):

1. String user;
2. String msg = "empty";
3. String oldMsg = "empty";

The the program runs and every 11 seconds the draw() checks twitter when it calls the function getTweets(), that I wrote. In that function there is a loop that runs, and in that loop is this segment of code:

1. msg = t.getText(); // the message from twitter
2.      
3.       if(oldMsg.equals(msg))
4.       {
5.         println("same message as before. Nothing new");
6.       }
7.       else
8.       {
9.        
10.         println("new message!!!");
11.         println(msg);
12.         println(oldMsg);
13.         background(114455);
14.         text("What people are saying:", 15, 20);
15.         text(user + " says " + msg, 15, y);
16.       }

NOTE: before breaking out of the function oldMsg is updated with whatever the current tweet is.

the first time the code runs oldMsg = "empty" and msg = "what ever the incoming tweet is", so the else portion of the condition runs, EXCEPT that it won't print the text() on the screen, until getTweets() is called again 11 seconds later. When it's called the second time, assuming no new tweets have come in, both oldMsg and msg are the same, because oldMsg was updated the first time the getTweets() function ran.  so, println("same message as before. Nothing new");, runs. AND then both of the text()s run (nothing else in the else portion runs, just the text()).

Thoughts on this mystery?

Thanks

      I am creating a date and time string, which works mostly great for my needs:

1. //time and date
2. int mo = month();
3. int d = day();
4. int y = year();
5. int m = minute();
6. int h = hour();
7.   
8. String timeDate = mo + "/" + d + "/" + y + " at " + h + ":" + m;
9. println(timeDate);

except when the minutes are before 10. So if it's 11:03 according to the clock on my computer, my println yields 11:3, not 11:30.

Any tips to fix this? Thanks

Hello- first THANK YOU for reading this. I hope you can help. I have a sudden presentation to do this afternoon using Processing/Arduino. Problem is I'm not using my desktop tower. I need to use a loaner MacBook Pro (running OS 10.5.8). I've installed Processing and Ardunio but when I plug my Arduino board into the laptop the serial port isn't found. I know the usb port is working because i can use a flash drive in the same slot.

this is what i get when i run println(Serail.list());

[0] = "/dev/tty.Bluetooth-PDA-Sync"
[1] = "/dev/cu.Bluetooth-PDA-Sync"
[2] = "/dev/tty.Bluetooth-Modem"
[3] = "/dev/cu.Bluetooth-Modem"

no where am i seeing the Arduino board. and pluged in or unplugged that println list doesn't change. i've even gone into arduino and the serail port doesn't  show up under tools/serial port. only the same ones listed in processing show up.

can anyone help me please? i'd hate to have to take apart my tower and take it with me to this presentation/meeting! lol

big thanks in advance!
`shields

so i built a program using the following example from http://blog.blprnt.com/blog/blprnt/quick-tutorial-twitter-processing after importing twitter4j into my processing program:

1. Twitter myTwitter;
   
   void setup() {
    myTwitter = new Twitter("yourTwitterUserName", "yourTwitterPassword");
    try {
   
    Query query = new Query("sandwich");
    query.setRpp(100);
    QueryResult result = myTwitter.search(query);
   
    ArrayList tweets = (ArrayList) result.getTweets();
   
    for (int i = 0; i < tweets.size(); i++) {
    Tweet t = (Tweet) tweets.get(i);
    String user = t.getFromUser();
    String msg = t.getText();
    Date d = t.getCreatedAt();
    println("Tweet by " + user + " at " + d + ": " + msg);
    };
   
    }
    catch (TwitterException te) {
    println("Couldn't connect: " + te);
    };
   };
   
   void draw() {
   
   };
   

you see where the query phrase is "sandwich"? if i run the code as is, i get 100 results with the word "sandwich" in them. works fine. but i really wanted to manipulate the results of my own tweets. so i changed "sandwich" to my username. worked great for the longest time (weeks). i was able to pull my own tweets and the filter and manipulate the results. loaded it up today (to demo) and now it no longer works (figures, right?). maybe there is some changes on how twitter search which no longer allows my to query myself (or any user name)....don't know why it won't work anymore. and i haven't changed a thing since i last ran it a week ago.

 so any thoughts on how i tweak the code so i can retrieve tweets only by specfic users? i'm a bit of a novice, learning as i go, so please bear with me. much thanks,
shields

I'm using this chunk of code, along with twitter4j, to graph out the use of the word "sandwich" as a test for another project.

1. Twitter myTwitter;
2. void setup()
3. {
4.   size(500, 500);
5.   background(0);
6.   myTwitter = new Twitter("myUserName", "myPassword");
7. }
8. void draw()
9. {
10.   background(0);
11.  
12.  
13.   try
14.   {
15.     
16.      Query query = new Query("sandwich");
17.    
18.      query.setRpp(10);
19.  
20.     QueryResult result = myTwitter.search(query);
21.     ArrayList tweets = (ArrayList) result.getTweets();
22. for (int i = 0; i < tweets.size(); i++)
23.     {
24.       Tweet t = (Tweet) tweets.get(i);
25.       String user = t.getFromUser();
26.       String msg = t.getText();
27.       Date d = t.getCreatedAt();
28.       println("Tweet by " + user + " at " + d + ": " + msg);
29.      
30.       if (msg.indexOf("peanut") != -1 && msg.indexOf("jelly") != -1)
31.       {
32.         fill(250, 0, 0); //red
    
33.       }
34.       else
35.       {
36.         fill(255); //white
37.       }
38.      
    
39.       rect(0, i * 10, msg.length() * 3, 10);
40.      
41.     }// end for
42.   
43.   }//end try
44.  
45.   catch (TwitterException te)
46.   {
47.     println("Couldn't connect: " + te);
48.   }//end catch
49.  
50.   
51.  
52.   println("delay reached");
53.   delay(5000);
    
54.   println("delay elapsed");
55.  
56.  
57. }//end draw

the problem is the bars of the graph don't draw until AFTER the delay, yet they should do it before. However they draw correctly when they do draw.

Any thoughts?