mischief makers code walkthrough 1

mischiefmakers_1

int frames = 80;

boolean save_frames = true;

color[] colors = {color(202,170,221), color(26,20,20)};

void setup(){
  size(500,500);
  smooth(8);
}

void draw(){
  if(frameCount==frames){
    frameCount = 0;
  }
  float k = 1.0* frameCount / frames;
  float kp = k*TWO_PI;
  background(55,143,193);
  noFill();
  
  //draw arcs
  pushMatrix();
  translate(width/2, height/2);
  
  float[] A = {0,0};
  int w2 = width;
  int r = 9;
  int N = w2/r;
  for(int i=0;i<N;++i){
    float j = 1.0*N/i/20 + k;
    float jp = j*TWO_PI;
    /*
    angles[0] = TWO_PI * ((sin(jp)+1)/2);
    angles[1] = angles[0]+PI;
    */
    A[0] = 0;
    A[1] = TWO_PI * ((sin(jp)+1)/2);
    circular_arc(r+i*r, 3, A, colors);
  }
  popMatrix();
  

  if (frameCount>=frames){
    frameCount=0;
  }
}

//angles is radians, where angles is increasing [0..TWO_PI]
void circular_arc(float radius, int weight, float[] angles, color[] colors){
  int i = 1;
  
  strokeWeight(weight);
  
 float a, b=0;
  while (i<angles.length){
    a = angles[i-1];
    b = angles[i];
    stroke(colors[i]);
    arc(0,0, radius, radius, a, b);
    ++i;
  }
  a = b;
  b = a + angles[0] + TWO_PI-a;
  stroke(colors[0]);
  arc(0,0, radius,radius, a,b);
}