int circleSize;
float angle; // global variables
int a;
float change;
int xCenter;
int yCenter;
int nStroke;
boolean bInit;

float x;
float y;
float m;
float b;
void setup() {
  size(800, 600);
  bInit=true;
  firstInit();
  circleSize = 50;
  change = 4;
  nStroke = 1;
  xCenter = width/4;
  yCenter = height/4;
  angle = 180;
  a = 150;
  b = 75;
  background(255);
  fill(255, 0, 0);
}

void draw() {
float x;  // local variables
  float y;
  x = xCenter + a * cos(radians(angle));
  y = yCenter + b * sin(radians(angle));
  ellipse(x+270, y+270, circleSize, circleSize);
  angle = angle + change;
  if (angle-180 < -90 || angle-180 > 90) {
    change = -change;
    nStroke++;
  } 
switch(nStroke) {
  case 1:
    firstInit();
    break;
  case 2:
    secondInit();
    break;
}
}
void firstInit() {
 if (bInit) {
  bInit = false;
  x = 100+90;
  y = 21;
  b = 300;
  m = 400.0/200.0;
}
else {
  x = x + change;
  y = -m * -x + b-30;
  stroke(0);
  fill(0, mouseX, 128, random(121));
  ellipse(x, y, 25, 25);
  if (y  < 150) {
  nStroke++;
   
  }
}
}

void secondInit() {
 if (bInit) {
  bInit = false;
//  x = 100;
//  y = 0;
//  b = 30;
//  m = 400.0/200.0;

}
else {

    ellipse(x, y, 30, 30);
    y = y + change;
    if (y > 300) {
      nStroke++;
      bInit = true;
    }
  }

  nStroke++;
   
  }