I can make eased rotation work ( like in this Flash demo), but I need the rotation to happen at a fixed rate, no matter how much the angles differ.

The code that rotates with easing:

2. // get the angle distance between the goal and curent direction
3.     float goalAngle = goal.heading();
4.     float dirAngle = direction.heading();
5.     float distance = abs(goalAngle - dirAngle);
6.     
7.     // convert distance to a percentage to lerp (0~TWO_PI to 0~1)
8.    float percentage = map(distance, 0, TWO_PI, 0, 1); 
9.     
10.     direction.lerp(goal, percentage);

Here is the timer class:

2. class Timer {
3.   int a; //Counter limit
4.   int b; //Counter
5.   boolean done;
6.   
7.   
8.   Timer(int c) {
9.     a = 0; //set counter
10.     b = c; //set limit
11.     
12.     done = false;
13.   }
14.   
15.   void advance() {
16.     a++;
17.     if (a > b) done = true;
18.   }
19.   
20.   boolean check() {
21.     return done;
22.   }
23.   
24.   void destroy() {
25.     myTimer.remove(this);
26.   }
27. }
28. 
    

Here is the code that gets called to create a bullet:

2. void fireBullet() {
3.       projectileList.add(new Bullet(myPlayer.x, myPlayer.y, myPlayer.pAngle));
4.   }

The goal is to have " projectileList........pAngle));" be called once every 15 frames (or more/less). So, where do I create an instance of the timer class? How do I access the right timer class to check it's status?

Each timer will be stored in an ArrayList.

 The problem with this method is that the audio file have to be pulled of the disk every time a sound needs to be played. I cannot just have one channel for each sound effect either, because then the sounds will be unable to play in rapid succession.

Here is my current audio class. I'm sure there is a much better way to play sounds, but I'm fairly new to OOP, and I can't think of a better way.

class Audio {   void playSound(int selected, float volume) { //loads a sound into a channel     myChannel = (AudioChannel[])expand(myChannel, myChannel.length + 1); //expand the array to

make room for the new audio track

    myChannel[myChannel.length - 1] = new AudioChannel(selected + ".mp3"); //add the new rack          myChannel[myChannel.length - 1].volume(volume); //set the volume     myChannel[myChannel.length - 1].play(); //play the channel     myChannel[myChannel.length - 1].cue(1); //increase the cue, to fix a problem where the cue

 reads "0" for the first frame, setting off the terminator   }      void advance() { //runs every frame     for (int i = 0; i < myChannel.length; i++) { //run for every channel              if(myChannel[i].cue == 0) { //if the channel has finished playing...         myChannel = (AudioChannel[])subset(myChannel,1,myChannel.length - 1); //delete the channel       }     }   } } 

Thanks for any help!

Is there a special way for classes to access the main part of a sketch? I'm new to OOP, so any tips are appreciated.

Here is my main sketch:

2. /*
3. Ben Cracknell
4. January 30, 2012
5. */
6. 
   
7. /****************************************************************************
8. **********************************MAIN LOOP**********************************
9. ****************************************************************************/
10. 
    
11. //user editable variables
12.   //player
13. 
    
14. //system variables
15.   //player
16.     Player myPlayer; //create var for player class
17.   
18. void setup() {
19.   size(800,600);
20.   smooth();
21.   
22.   initPlayer(); //initilize player
23. }
24. 
    
25. void draw() {
26.   background(20); //redraw background every frame, to erase previous frames
27. }
28. 
    
29. 
    
30. /****************************************************************************
31. **********************************FUNCTIONS**********************************
32. ****************************************************************************/
33. 
    
34. //this function innitilizes the player
35. void initPlayer() {
36.   myPlayer = new Player(width / 2, height / 2); //load player object
37. }

Here is the class file:

2. class Player {
3.   
4.   //user editable variables
5.     //player
6.       int playerSize = 40; //height and width of player in px
7.   
8.   Player(int dx, int dy) { //dx and dy will be the player's location
9.     //base colors
10.     stroke(120);
11.     fill(255);
12.     
13.     //base
14.     ellipseMode(CENTER);
15.     ellipse(dx,dy,playerSize,playerSize); //draw ball *****Problem on this line*****
16.   }
17. }

It is important that no numbers repeat.

1. String bottom = "apple";
2. String top = bottom;
3. 
   
4. top = pear;
5. println(bottom); //I want this to equal "pear"

1. if (today.recievedDay == "Mon")
2. {
3.       //Do stuff
4. }

I though of this:

1. recievedDay = split(today.recievedDay, "?");

Yahoo

And my code:

2. XMLElement xml;
3. 
   
4. void setup() {
5.   
6.   PFont font;
7. 
   
8.   size(500,300);      //screen size, etc. 
9.   background(0);
10. 
    
11.   font = loadFont("Arial-Black-48.vlw");
12.   fill(255);
13.   textFont(font, 13);
14. }
15. 
    
16. void draw() {
17.   if(second() == 0) { //Run every minute (Just for testing, will later run every hour
18.     String feed = ("http://weather.yahooapis.com/forecastrss?w=24493874&u=c");
19.     xml = new XMLElement(this,feed);
20.   
21.     background(0);
22. 
    
23.     XMLElement yweather = xml.getChild("weather"); //I think the problem is here. What should the child be?
24. 
    
25.     String currweather = yweather.getContent(); //current weather
26.   }
27. }

This code originally came from  Here, and I edited it.

The error is: "NullPointerException"

I think the problem is on line 23, I don't know what should be in the quotes (I have no xml experience)

The information I hope to get from the XLM data is: 

1. <yweather:forecast day="Sat" date="26 Nov 2011" low="9" high="10" text="Showers/Wind" code="11"/>

Thanks for any help!

to make a pan/tilt servo thingy, but im running into some problems. I have windows 7 64bit.

Problem:

BLACK WINDOW AT THE BOTTOM:

ArrayIndexOutOfBoundExeption: 3

CODE:

****************END***************

Also, when I run the code, I hear the computer disconect and connect USB sound a few times, and the arduino TR&TX

lights flash.

thanks