Perlin noise test

noise_test.pde

float noise_step = 0.01;
float noise_velocity = 0.0001;
float noise_accel = 0.0001;

void setup() {
  size(500, 500);
}

void keyPressed() {
  if (keyCode == UP) {
    noise_step += noise_velocity;
    noise_velocity += noise_accel;
  } else if (keyCode == DOWN) {
    noise_step += noise_velocity;
    noise_velocity -= noise_accel;
  }
}

void keyReleased() {
  if (keyCode == UP || keyCode == DOWN) {
    noise_velocity = 0;
  }
}

void draw() {
  float ynoise = 0;
  for (int y = 0; y < height; y++) {
    ynoise += noise_step;
    float xnoise = 0;
    for (int x = 0; x < width; x++) {
      xnoise += noise_step;
      set(x, y, color(255 * noise(xnoise, ynoise)));      
    }
  }
  
  text("noise step=" + noise_step, 10, 10);
}