Sine Wave

/**
* Sine Wave
*
* @author aa_debdeb
* @date 2015/08/26
*/

float amplitude = 200;
float xStep = 0.1;
float currentAngle = 0.0;
float angleSpeed = 0.5;
float angleStep = 2.0*PI / 512;

void setup(){
  size(500, 500);
  smooth();
  noFill();
  background(0);
  frameRate(60);
}

void draw(){
  background(0);
  
  stroke(255);
  strokeWeight(1);
  
  float angle = currentAngle;
  float y = amplitude * sin(angle) + (height / 2);
  float x = 0.0;
  while(x <= width){
    angle += angleStep;
    float nextX = x + xStep;
    float nextY = amplitude * sin(angle) + (height / 2);
    line(x, y, nextX, nextY);
    x = nextX;
    y = nextY;
  }
  updateCurrentAngle();
  
  
}

void updateCurrentAngle(){
  currentAngle += angleSpeed;
  if(currentAngle >= 2*PI){
    currentAngle -= 2 *PI;
  }
}