Is there a way to return the key for a HashMap as an integer? I used integers as the key and I'm trying to get integers back when I call getKey() but it returns objects.

How do I get createWriter to write to the same line in a file and createrReader to keep reading from the same line?

Hey, does anyone know how to get the Kinect to track multiple hands in the SimpleOpenNI "Hands" example?

It says in the comments...

* This example works with multiple hands, to enable mutliple hand change
 * the ini file in /usr/etc/primesense/XnVHandGenerator/Nite.ini:
 *  [HandTrackerManager]
 *  AllowMultipleHands=1
 *  TrackAdditionalHands=1
 * on Windows you can find the file at:
 *  C:\Program Files (x86)\Prime Sense\NITE\Hands\Data\Nite.ini

but when I check the file, they both already equal 1.

HELLO!

I got this "explosion simulator" and I would like to know how I can keep making new explosions when I click the mouse instead of replacing the original explosion like it does now. Also, Is it possible to have a class create an array of itself?

PS: I changed the shape to rectangles because they look cooler.

1. Ball[] manyBalls = new Ball[200];
2. 
   
3. void setup() {
4.   size(900, 600);
5.   for (int i=0; i < manyBalls.length; i++) {
6.     manyBalls[i] = new Ball(width/2, height/2);
7.   }
8. }
9. 
   
10. void draw() {
11.   fill(255, 50);
12.   rect(0, 0, width, height);
13. 
    
14.   for (int i=0; i < manyBalls.length; i++) {
15.     manyBalls[i].move();
16.   }
17. }
18. 
    
19. void mousePressed() {
20.   for (int i=0; i < manyBalls.length; i++) {
21.     manyBalls[i] = new Ball(mouseX, mouseY);
22.   }
23. }
24. 
    
25. class Ball {
26.   float ballx;
27.   float bally;
28.   int ballSize = (int)random(5, 60);
29.   float ballspeed = random(2, 5);
30.   float ballxdirection = random(-1, 1);
31.   float ballydirection = random(-1, 1);
32.   int r = (int)random(254);
33.   int g = (int)random(254);
34.   int b = (int)random(254);
35.   int a = (int)random(50, 150);
36. 
    
37.   Ball(float tempballx, float tempbally) {
38.     ballx = tempballx;
39.     bally = tempbally;
40.   }
41. 
    
42.   void move() {
43.     if (ballx > width-ballSize/2 || ballx < ballSize/2)
44.       ballxdirection *= -1;
45.     if (bally > height-ballSize/2 || bally < ballSize/2)
46.       ballydirection *= -1;
47. 
    
48.     ballx += ballspeed*ballxdirection;
49.     bally += ballspeed*ballydirection;
50.     fill(r, g, b, a);
51.     noStroke();
52.     rect(ballx, bally, ballSize, ballSize);
53.     a -= 4;
54.   }
55. }

Is there a way to change mouseX/Y values to a space within the program instead of the program window? If you see in this sketch, I want the rectangle to be pointing to the mouse but since I zoomed in with camera the values for mouseX/Y are different then they appear (when the player moves off center).

...or am I going to have to unzoom it?

1. import processing.opengl.*;
2. 
   
3. int playerS = 25;
4. float playerX, playerY;
5. float accX, accY;
6. float rotation;
7. int gunL = 20;
8. int gunW = 15;
9. boolean pressUp = false;
10. boolean pressDown = false;
11. boolean pressLeft = false;
12. boolean pressRight = false;
13. 
    
14. void setup() {
15.   size(900, 600, OPENGL);
16.   smooth();
17.   cursor(CROSS);
18.   rectMode(CENTER);
19. 
    
20.   playerX = width/2;
21.   playerY = height/2;
22. }
23. 
    
24. void draw() {
25.   camera(playerX, playerY, 300,
26.   playerX, playerY, 0,
27.   0, 1, 0);
28. 
    
29.   background(255);
30.   fill(255);
31.   rect(width/2, height/2, width, height);
32. 
    
33.   rotation = atan2(mouseY - playerY, mouseX - playerX);
34.   pushMatrix();
35.   translate(playerX, playerY);
36.   rotate(rotation);
37.   fill(255, 0, 0);
38.   rect(gunL/2, 0, gunL, gunW);
39.   popMatrix();
40. 
    
41.   playerX += accX;
42.   playerY += accY;
43. 
    
44.   fill(0, 0, 255);
45.   ellipse(playerX, playerY, playerS, playerS);
46. 
    
47.   if (accX > 0)
48.     accX -= 0.2;
49.   if (accX < 0)
50.     accX += 0.2;
51.   if (accY > 0)
52.     accY -= 0.2;
53.   if (accY < 0)
54.     accY += 0.2;
55. 
    
56.   if (pressUp == true)
57.     accY -= 2;
58.   if (pressDown == true)
59.     accY += 2;
60.   if (pressLeft == true)
61.     accX -= 2;
62.   if (pressRight == true)
63.     accX += 2;
64. 
    
65.   if (accX > 6)
66.     accX = 6;
67.   if (accX < -6)
68.     accX = -6;
69.   if (accY > 6)
70.     accY = 6;
71.   if (accY < -6)
72.     accY = -6;
73. }
74. 
    
75. void keyPressed() {
76.   if (key == 'w')
77.     pressUp = true;
78.   if (key == 's')
79.     pressDown = true;
80.   if (key == 'a')
81.     pressLeft = true;
82.   if (key == 'd')
83.     pressRight = true;
84. }
85. 
    
86. void keyReleased() {
87.   if (key == 'w')
88.     pressUp = false;
89.   if (key == 's')
90.     pressDown = false;
91.   if (key == 'a')
92.     pressLeft = false;
93.   if (key == 'd')
94.     pressRight = false;
95. }

Hi, I'm trying to make an AsteroidsESK type game. I haven't started coding it yet but I'm trying to figure out how to get objects to follow the mouse. Right now I know of two ways, setting the X and Y coordinates of the object to the mouse and limiting the X and Y values and the second method is "easing". Finding the difference between the two points and dividing them. The problem with the first method is that the objects can only move in 8 directions, UP, DOWN, LEFT, RIGHT and the diagonals and the problem with the second method is that the objects change velocity depending on the distance. Does anyone know how to get the objects to float directly towards the mouse at a constant rate?

I've been looking for some code that does what I'm looking for like this one but I'm so bad at reading and understanding other peoples code.

http://www.openprocessing.org/sketch/34499
The ellipse created here float directly to the mouse at a constant rate.

The same issue applies for the bullets that player will be shooting but if I can get one to work, I can get the other.

Can anyone tell me what's the difference between lightSpecular() and specular(), why they need each other to work, and why they both carry their own set of values?

Couldn't all it's functionality work with just one function?

Is there a way to adjust the volume of sound files using minim?

If not how do people usually adjust the volume?

Ok, I got this rain generator but I'm trying to figure out how to get it to drop less drops while falling at a slower rate AND keeping the drop distance at 600. Can someone help?

1. import processing.opengl.*;
2. 
   
3. int[] rainX = new int[20];
4. int[] rainY = new int[20];
5. int rainZ = 600;
6. 
   
7. void setup() {
8.   size(600, 400, OPENGL);
9.   noStroke();
10.   noCursor();
11.   camera(width/2, 400, 560,
12.   width/2, height/2, 200,
13.   0, 1, 0);
14. }
15. 
    
16. void draw() {
17.   background(255);
18. 
    
19.   fill(0);
20.   rect(0, 0, 600, 400);
21. 
    
22.   for (int i = rainX.length-1; i > 0; i--) {
23.     rainX[i] = rainX[i-1];
24.     rainY[i] = rainY[i-1];
25.   }
26. 
    
27.   rainX[0] = (int)random(mouseX-50, mouseX+50);
28.   rainY[0] = (int)random(mouseY-50, mouseY+50);
29. 
    
30.   sphereDetail(6);
31.   fill(70, 130, 180);
32.   for (int c = 0; c < rainX.length; c++) {
33.     pushMatrix();
34.     translate(rainX[c], rainY[c], rainZ);
35.     sphere(6);
36.     popMatrix();
37.     rainZ -= 30;
38.   }
39.   rainZ = 600;
40. }

Can someone (help me) create a 3D arrow using beginShape()?

Does anyone know why this simple program drops my frameRate to 20-25? Am I missing something?

1. float ballX, ballY;
2. float speedX = 7;
3. float speedY = 5;
4. int dirX = 1;
5. int dirY = 1;
6. 
   
7. void setup() {
8.   size(900, 600, P3D);
9.   background(200);
10.   smooth();
11.   noFill();
12.   //noStroke();
13.   //noCursor();
14.   camera(
15.   width/2.0, 600, 500,
16.   width/2.0, height/2, -200,
17.   0, 1, 0);
18. 
    
19.   ballX = width/2;
20.   ballY = height/2;
21. }
22. 
    
23. void draw() {
24.   background(200);
25.  
26.   //Creates floor
27.   fill(255);
28.   rect(0, 0, 900, 600);
29. 
    
30.   //Creates top wall
31.   pushMatrix();
32.   translate(width/2, -100/2, 50/2);
33.   fill(150);
34.   box(width + 400, 100, 50);
35.   popMatrix();
36. 
    
37.   //Creates sphere
38.   ballX += speedX * dirX;
39.   ballY += speedY * dirY;
40.   pushMatrix();
41.   translate(ballX, ballY, 6);
42.   fill(50);
43.   sphere(6);
44.   popMatrix();
45. 
    
46.   //Creates paddle 1
47.   pushMatrix();
48.   translate(60, mouseY, 15/2+5);
49.   fill(255, 0, 0);
50.   box(15, 60, 15);
51.   popMatrix();
52. 
    
53.   //Creates paddle 2
54.   pushMatrix();
55.   translate(width - 60, mouseY, 15/2+5);
56.   fill(0, 0, 255);
57.   box(15, 60, 15);
58.   popMatrix();
59.  
60.   if (ballX >= width || ballX <= 0)
61.     dirX *= -1;
62.  
63.   if (ballY >= height || ballY <= 0)
64.     dirY *= -1;
65.    
66.   println(frameRate);
67. }

EDIT: Oddly enough, commenting out smooth() increases FPS by 30+... :/

If anyone knows anyway to get it to run faster I'd really appreciate it.

I want to create a pong game that has this view point...



What I want to know is if I can separate the x/y plane from the view-point allowing me to move the paddles by only changing the y-values or am I going to have to change the x and y values in order the get them going up and down?

HEY!

I'm trying to make a continuous wave using line(). The line will serve as a dynamic track that the user will be able to create on the fly as a ball continuously rolls through it. The problem I'm having is getting the track to stick on the background rect() as it moves left. I tried using opacity but once a new line is created the old one doesn't stick. Would anyone be able to help me here?

int mouseXOld;
int mouseYOld;
int rectX = 600;

void setup() {
  size(600, 400);
  noStroke();
  background(0);
  //frameRate(30);
}

void draw() {
  rectX--;
  fill(0, 0, 0, 1000);
  rect(rectX, 0, 600, 400);
  stroke(255);
  line(mouseXOld, mouseYOld, mouseX, mouseY);
  mouseXOld = mouseX;
  mouseYOld = mouseY;
}

I don't have much code here but I plan to make the lines X values static at 600 or so. I think I'm explaining it like a retard so if anyone has any questions...