Mimi Yin NYU-ITP

Mapping techniques.

*/

var sound;

var input = 0;

var mapping = 0;

var value = 0;

var pspeed = 0;

var volume = 0;

​

var inputs = ["Position", "Speed", "Acceleration"];

var mappings = ["Linear", "Non-Linear", "Step", "Sawtooth", "Sin", "Noise", "Linear-Random", "Random"];

​

function preload() {

  sound = loadSound("data/police.mp3");

}

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  sound.setVolume(0);

  sound.loop();

  noiseSeed(0);

  background(0);

}

​

function draw() {

  // Switch the input

  var speed = abs(mouseX - pmouseX);

  var accel = abs(speed - pspeed);

​

  switch (input) {

    // Position

    case 0:

      value = mouseX;

      break;

      // Speed

    case 1:

      value = speed * width * 0.1;

      break;

      // Acceleration

    case 2:

      value = accel * width * 0.1;

      break;

  }

​

  // Store the value for next frame

  pspeed = speed;

​

  // Make it louder

  // Define the range of volume to be roughly (0-2);

  var scl = 2;

​

  // Switch how inputs are mapped to volume

  switch (mapping) {

    // Linear mapping

    case 0:

      volume = scl * value / width;

      break;

      // Non-linear mapping

    case 1:

      volume = width / (width - value) - 1;

      break;

      // Step-function

    case 2:

      var interval = width / 3;

      volume = scl * floor(value / interval);

      break;

      // Saw-tooth wave

    case 3:

      var interval = width / 3;

      volume = scl * (value % interval / interval);

      break;

      // Sine wave

    case 4:

      volume = (sin(2 * TWO_PI * value / width) * scl / 2 + scl / 2);

      break;

      // Noise

    case 5:

      if (frameCount % 2 == 0) {

        volume = noise(value * 0.01) - 0.25;

        volume = map(volume, 0, 0.5, 0, 1);

      }

      break;

      // Linear random

    case 6:

      if (frameCount % 5 == 0) {

        volume = random(scl * value / width);

      }

      break;

      // Random

    case 7:

      if (frameCount % 5 == 0) {

        volume = random(scl);

      }

      break;

  }

​

  volume = constrain(volume, 0, 100);

  sound.setVolume(volume);

​

  background(0);

  fill(255);

  noStroke();

  ellipse(mouseX, height / 2, volume * 100 + 50, volume * 100 + 50);

​

  textSize(12);

  text("Press RETURN to change input. Press ESC to change mapping.", 10, 20);

  textSize(18);

  text("INPUT: " + input + "\tMAPPING: " + mapping, 10, 40);

  //text("INPUT: " + input + " (" + inputs[input] + ")\tMAPPING: " + mapping + " (" + mappings[mapping] + ")", 10, 40);

}

​

function keyPressed() {

  switch (keyCode) {

    case ESCAPE:

      mapping++;

      mapping %= 8;

      break;

    case RETURN:

      input++;

      input %= 3;

      break;

  }

}