gistfile1.pde

int leds = 25;

int _rows = 3;
int _size = 25;
int _spacing = 5;

int round = 0;

float speed_r = 1.0;
float speed_g = 1.5;

void setup() {
  size((_spacing+_size)*leds + _spacing, (_spacing+_size)*_rows + _spacing);
  ellipseMode(CORNER);
  for(int i=0; i < leds; i++) {
    for (int j=0; j < _rows; j++) {
      ellipse(_spacing+i*(_size+_spacing), _spacing + j*(_size+_spacing), _size, _size);
    }
  }
}

void setColor(int offset, int row, int r, int g, int b) {
  fill(r, g, b);
  ellipse(_spacing+offset*(_size+_spacing), _spacing+row*(_size+_spacing), _size, _size);
}

void draw() {
  float x;
  for(int i=0; i < leds; i++) {
    float intensity_r = (sin(((i + round*speed_r) % leds)/2) + 1) / 2.0;
    float intensity_g = (sin(((i + round*speed_g) % leds)) + 1) / 2.0;
    
    setColor(i, 0, floor(intensity_r * 155)+100, 0, 0);
    setColor(i, 1, floor(intensity_g * 155)+100, 0, 0);
    //setColor(i, 2, floor((intensity_r+intensity_g)/2.0 * 155)+100, 0, 0);
    // setColor(i, floor(intensity_r * 155)+100, floor(intensity_g * 155)+100, 0);
  }

  round += 1;
  delay(250);
}