Processing Forum

beads library - changing sample song dynamically

[0 Replies]
- 02-Dec-2012 10:24 PM
- Forum: Contributed Library Questions
Hello,

I have a program I'm working on that uses the Beads library to sample songs and change the rate at which they're played (this is done using a potentiometer—I'm sending data in from an Arduino to control the rate).

In this program, the sound clip is established in the void setup() function.

However, I would like to be able to change the song sample dynamically, in void draw(), depending on what data the program is receiving. I have five different songs, and I want the Processing program to play a different song, depending on whether the values it's receiving are between 1-100, 101-200, 201-300, 301-400, or 401-500.

Here is my code so far:
2. import processing.serial.*;
4. Serial port;
6. float derp = 0;
8. // Sampling_03.pde
10. // this is a more complex sampler
11. // clicking somewhere on the window initiates sample playback
12. // moving the mouse controls the playback rate
14. import beads.*;
16. AudioContext ac;
18. SamplePlayer sp1;
20. // we can run both SamplePlayers through the same Gain
21. Gain sampleGain;
22. Glide gainValue;
24. Glide rateValue;
26. void setup()
27. {
28. size(800, 600);
30. port = new Serial(this, "/dev/tty.usbmodem411", 9600);
31. port.bufferUntil('\n');
33. ac = new AudioContext(); // create our AudioContext
35. // whenever we load a file, we need to enclose the code in a Try/Catch block
36. // Try/Catch blocks will inform us if the file can't be found
37. try {
38. // initialize the SamplePlayer
39. sp1 = new SamplePlayer(ac, new Sample(sketchPath("") + "prelude_no_8.mp3"));
40. }
41. catch(Exception e)
42. {
43. // if there is an error, show an error message (at the bottom of the processing window)
44. println("Exception while attempting to load sample!");
45. e.printStackTrace(); // then print a technical description of the error
46. exit(); // and exit the program
47. }
49. // note that we want to play the sample multiple times
50. sp1.setKillOnEnd(false);
52. rateValue = new Glide(ac, 1, 30); // initialize our rateValue Glide object
53. sp1.setRate(rateValue); // connect it to the SamplePlayer
55. // as usual, we create a gain that will control the volume of our sample player
56. gainValue = new Glide(ac, 0.0, 30);
57. sampleGain = new Gain(ac, 1, gainValue);
58. sampleGain.addInput(sp1);
60. ac.out.addInput(sampleGain); // connect the Gain to the AudioContext
62. ac.start(); // begin audio processing
64. background(0); // set the background to black
65. stroke(255);
66. line(width/2, 0, width/2, height); // draw a line in the middle
67. text("Click to begin playback.", 100, 100); // tell the user what to do!
68. text("Move the mouse to control playback speed.", 100, 120); // tell the user what to do!
69. }
71. // although we're not drawing to the screen, we need to have a draw function
72. // in order to wait for mousePressed events
73. void draw()
74. {
76. float halfWidth = width / 2.0;
78. gainValue.setValue((float)mouseY / (float)height); // set the gain based on mouse position along the Y-axis
79. rateValue.setValue(((float)derp - halfWidth)/halfWidth); // set the rate based on mouse position along the X-axis
81. print("gain:");
82. println((float)mouseY / (float)height);
83. print("rate:");
84. println(((float)derp - halfWidth)/halfWidth);
85. print("derp:");
86. println(derp);
87. }
89. // this routine is called whenever a mouse button is pressed on the Processing sketch
90. void mousePressed()
91. {
92. // if the left mouse button is clicked, then play the sound
93. if( mouseX > width / 2.0 )
94. {
95. sp1.setPosition(000); // set the start position to the beginning
96. sp1.start(); // play the audio file
97. }
98. // if the right mouse button is clicked, then play the bass drum sample backwards
99. else
100. {
101. sp1.setToEnd(); // set the start position to the end of the file
102. sp1.start(); // play the file in reverse (rate set in the draw routine)
103. }
104. }
106. void serialEvent (Serial port)
107. {
108. derp = float(port.readStringUntil('\n'));
109. }
Any help would be largely appreciated! Thank you!

make Game of Life with bigger pixels?

[2 Replies]
- 05-Dec-2011 09:55 AM
- Forum: Programming Questions
I'm trying to edit this program so that the changing pixels are larger, but I'm not sure how
2. int sx, sy;
3. float density = 0.5;
4. int[][][] world; //triple array
6. void setup()
7. {
8. size(640, 500, P2D);
9. frameRate(12); //set a framerate variable--1000/framerate = new variable called frameDuration
10. sx = width;
11. sy = height;
12. world = new int[sx][sy][2];
14. // Set random cells to 'on'
15. for (int i = 0; i < sx * sy * density; i++) {
16. world[(int)random(sx)][(int)random(sy)][1] = 1;
17. }
18. }
20. void draw()
21. {
22. background(0);
24. // Drawing and update cycle
25. for (int x = 0; x < sx; x=x+1) {
26. for (int y = 0; y < sy; y=y+1) {
27. //if (world[x][y][1] == 1)
28. // Change recommended by The.Lucky.Mutt
29. if ((world[x][y][1] == 1) || (world[x][y][1] == 0 && world[x][y][0] == 1))
30. {
31. world[x][y][0] = 1;
32. set(x, y, #FFFFFF);
33. }
34. if (world[x][y][1] == -1)
35. {
36. world[x][y][0] = 0;
37. }
38. world[x][y][1] = 0;
39. }
40. }
41. // Birth and death cycle
42. for (int x = 0; x < sx; x=x+1) {
43. for (int y = 0; y < sy; y=y+1) {
44. int count = neighbors(x, y);
45. if (count == 3 && world[x][y][0] == 0) // if the cell is black and has three white neighbors
46. {
47. world[x][y][1] = 1;
48. // audio here
49. }
50. if ((count < 2 || count > 3) && world[x][y][0] == 1) // if the cell is white and has less than 2 or more than 3 white neighbors
51. {
52. world[x][y][1] = -1;
53. //audio here
54. }
55. }
56. }
57. }
59. // differentiate between different coordinates on the grid
61. // Count the number of adjacent cells 'on'
62. int neighbors(int x, int y)
63. {
64. return world[(x + 1) % sx][y][0] +
65. world[x][(y + 1) % sy][0] +
66. world[(x + sx - 1) % sx][y][0] +
67. world[x][(y + sy - 1) % sy][0] +
68. world[(x + 1) % sx][(y + 1) % sy][0] +
69. world[(x + sx - 1) % sx][(y + 1) % sy][0] +
70. world[(x + sx - 1) % sx][(y + sy - 1) % sy][0] +
71. world[(x + 1) % sx][(y + sy - 1) % sy][0];
72. }

conway's game of life with music

[4 Replies]
- 05-Dec-2011 12:05 AM
- Forum: Contributed Library Questions
For some reason, every time I try to run this program, I just get a gray window. Anybody know how to make this program work? I'm using a combination of Conway's Game of Life ( http://processing.org/learning/topics/conway.html) and the Ess library ( http://www.tree-axis.com/Ess/). Thanks!
2. import krister.Ess.*;
4. int sx, sy;
5. float density = 0.5;
6. int[][][] world; //triple array
8. AudioChannel myChannel1;
9. SineWave myWave1;
11. int frameDuration;
13. void setup()
14. {
15. size(640, 500, P2D);
16. frameRate(12); //set a framerate variable--1000/framerate = new variable called frameDuration
17. sx = width;
18. sy = height;
19. world = new int[sx][sy][2];
21. frameDuration = 1000/12;
23. // Set random cells to 'on'
24. for (int i = 0; i < sx * sy * density; i++) {
25. world[(int)random(sx)][(int)random(sy)][1] = 1;
26. }
28. // start up Ess
29. Ess.start(this);
31. // create a new AudioChannel
32. myChannel1=new AudioChannel();
34. // set the channel size to 5 seconds
35. myChannel1.initChannel(myChannel1.frames(frameDuration));
36. }
38. void draw()
39. {
40. background(0);
42. // Drawing and update cycle
43. for (int x = 0; x < sx; x=x+1) {
44. for (int y = 0; y < sy; y=y+1) {
45. //if (world[x][y][1] == 1)
46. // Change recommended by The.Lucky.Mutt
47. if ((world[x][y][1] == 1) || (world[x][y][1] == 0 && world[x][y][0] == 1))
48. {
49. world[x][y][0] = 1;
50. set(x, y, #FFFFFF);
51. }
52. if (world[x][y][1] == -1)
53. {
54. world[x][y][0] = 0;
55. }
56. world[x][y][1] = 0;
57. }
58. }
59. // Birth and death cycle
60. for (int x = 0; x < sx; x=x+1) {
61. for (int y = 0; y < sy; y=y+1) {
62. int count = neighbors(x, y);
63. if (count == 3 && world[x][y][0] == 0) // if the cell is black and has three white neighbors
64. {
65. world[x][y][1] = 1;
66. // audio here
67. myWave1=new SineWave(480,.1);
68. myWave1.generate(myChannel1,0,myChannel1.frames(frameDuration));
69. }
70. if ((count < 2 || count > 3) && world[x][y][0] == 1) // if the cell is white and has less than 2 or more than 3 white neighbors
71. {
72. world[x][y][1] = -1;
73. //audio here
74. myWave1=new SineWave(680,.1);
75. myWave1.generate(myChannel1,0,myChannel1.frames(frameDuration));
76. }
77. }
78. }
79. }
81. // differentiate between different coordinates on the grid
83. // Count the number of adjacent cells 'on'
84. int neighbors(int x, int y)
85. {
86. return world[(x + 1) % sx][y][0] +
87. world[x][(y + 1) % sy][0] +
88. world[(x + sx - 1) % sx][y][0] +
89. world[x][(y + sy - 1) % sy][0] +
90. world[(x + 1) % sx][(y + 1) % sy][0] +
91. world[(x + sx - 1) % sx][(y + 1) % sy][0] +
92. world[(x + sx - 1) % sx][(y + sy - 1) % sy][0] +
93. world[(x + 1) % sx][(y + sy - 1) % sy][0];
94. }
96. public void stop() {
97. Ess.stop();
98. super.stop();
99. }

ESS library

[1 Reply]
- 04-Dec-2011 07:58 PM
- Forum: Contributed Library Questions
Hello, I'm trying to run this example sketch from http://www.tree-axis.com/Ess/ and for some reason, whenever I try to compile the code, I always get an error that reads: "The constructor Amplify(float) is undefined." How can I fix this? Thanks. :)
2. import krister.Ess.*;
4. // Example by Krister Olsson
6. AudioChannel myChannel;
7. Amplify myAmplify;
9. void setup() {
10. size(256,200);
12. // start up Ess
13. Ess.start(this);
15. // load "cell.aif" into a new AudioChannel
16. myChannel=new AudioChannel("cell.aif");
18. // amplify first 2 seconds 25%
19. myAmplify=new Amplify(.25);
21. myAmplify.filter(myChannel,0,myChannel.frames(2000));
23. // play
24. myChannel.play();
25. }
27. void draw() {
28. }
30. // we are done, clean up Ess
32. public void stop() {
33. Ess.stop();
34. super.stop();
35. }

cellular automata

[4 Replies]
- 26-Nov-2011 06:43 PM
- Forum: Programming Questions
Hi, I'm having some trouble understanding the code in this cellular automata example: http://processing.org/learning/topics/wolfram.html

I don't quite understand what's going on in the class CA—here's the portion of code I need help understanding:
2. class CA {
4. int[] cells; // An array of 0s and 1s
5. int generation; // How many generations?
6. int scl; // How many pixels wide/high is each cell?
8. int[] rules; // An array to store the ruleset, for example {0,1,1,0,1,1,0,1}
10. CA(int[] r) {
11. rules = r;
12. scl = 1;
13. cells = new int[width/scl];
14. restart();
15. }
17. CA() {
18. scl = 1;
19. cells = new int[width/scl];
20. randomize();
21. restart();
22. }
24. // Set the rules of the CA
25. void setRules(int[] r) {
26. rules = r;
27. }
29. // Make a random ruleset
30. void randomize() {
31. for (int i = 0; i < 8; i++) {
32. rules[i] = int(random(2));
33. }
34. }
36. // Reset to generation 0
37. void restart() {
38. for (int i = 0; i < cells.length; i++) {
39. cells[i] = 0;
40. }
41. cells[cells.length/2] = 1; // We arbitrarily start with just the middle cell having a state of "1"
42. generation = 0;
43. }
45. // The process of creating the new generation
46. void generate() {
47. // First we create an empty array for the new values
48. int[] nextgen = new int[cells.length];
49. // For every spot, determine new state by examing current state, and neighbor states
50. // Ignore edges that only have one neighor
51. for (int i = 1; i < cells.length-1; i++) {
52. int left = cells[i-1]; // Left neighbor state
53. int me = cells[i]; // Current state
54. int right = cells[i+1]; // Right neighbor state
55. nextgen[i] = rules(left,me,right); // Compute next generation state based on ruleset
56. }
57. // Copy the array into current value
58. cells = (int[]) nextgen.clone();
59. generation++;
60. }
62. // This is the easy part, just draw the cells, fill 255 for '1', fill 0 for '0'
63. void render() {
64. for (int i = 0; i < cells.length; i++) {
65. if (cells[i] == 1) fill(255);
66. else fill(0);
67. noStroke();
68. rect(i*scl,generation*scl, scl,scl);
69. }
70. }
72. // Implementing the Wolfram rules
73. // Could be improved and made more concise, but here we can explicitly see what is going on for each case
74. int rules (int a, int b, int c) {
75. if (a == 1 && b == 1 && c == 1) return rules[0];
76. if (a == 1 && b == 1 && c == 0) return rules[1];
77. if (a == 1 && b == 0 && c == 1) return rules[2];
78. if (a == 1 && b == 0 && c == 0) return rules[3];
79. if (a == 0 && b == 1 && c == 1) return rules[4];
80. if (a == 0 && b == 1 && c == 0) return rules[5];
81. if (a == 0 && b == 0 && c == 1) return rules[6];
82. if (a == 0 && b == 0 && c == 0) return rules[7];
83. return 0;
84. }
86. // The CA is done if it reaches the bottom of the screen
87. boolean finished() {
88. if (generation > height/scl) {
89. return true;
90. } else {
91. return false;
92. }
93. }
94. }
Thanks!

slow serial communication—really need help!

[6 Replies]
- 09-Nov-2011 03:17 PM
- Forum: Integration and Hardware
Hi, I have my arduino connected to two sensors that are controlling the graphics in a Processing program. However, the graphics are SUPER slow. I have no idea what could be causing this problem. Please help! My project is due in a couple of hours.

The code is here: http://arduino.cc/forum/index.php/topic,78475.0.html

need help with program that uses arrays

[3 Replies]
- 26-Feb-2011 05:59 PM
- Forum: Programming Questions
Hey, if i wanted to make all the little dots look as though they were moving around, kind of like on a television screen, what would I do?

// Example: 2D Array

size(800,600);

int cols = width;

int rows = height;

// Declare 2D array

int[][] myArray = new int[cols][rows];

// Initialize 2D array values

for (int i = 0; i < cols; i++) {

  for (int j = 0; j < rows; j++) {

   myArray[i][j] = int(random(255));

  }

}

// Draw points

for (int i = 0; i < cols; i++) {

  for (int j = 0; j < rows; j++) {

   stroke(myArray[i][j]);

   point(i,j);

  }

}

ArrayIndexOutOfBoundsException?

[3 Replies]
- 24-Feb-2011 11:37 PM
- Forum: Programming Questions
I copied this code straight from a Processing book, and yet whenever I try to compile, I keep receiving a message stating: ArrayIndexOutOfBoundsException = 0. Anybody know why?

float[] sineWave = new float[width];

void setup() {

}

void draw() {

  for (int i=0; i < width; i++) {

   float r = map(i, 0, width, 0, TWO_PI);

   sineWave[i] = abs(sin(r));

  }

  for(int i=0; i<sineWave.length; i++) {

   //Set the stroke values to numbers read from the array

   stroke(sineWave[i] * 255);

   line(i, 0, i, height);

  }

}

"this browser does not have a Java Plug-in"

[7 Replies]
- 24-Feb-2011 02:18 AM
- Forum: Integration and Hardware
Hello all,

I'm trying to export my Processing sketch to an HTML page. However, when I try to open it in Chrome, I receive the following message: " This browser does not have a Java Plug-in. Get the latest Java Plug-in here." I run Mac OS X 10.6, so I went to Software Update and installed all the updates I needed. It STILL doesn't work. Please help??

Thanks!

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