FunctionsChallenge/Code at master · DamienTheTiger/FunctionsChallenge · GitHub

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int diam;
PVector loc;
PVector vel;

void setup()
{
  size(400,400);
  diam = 15;
  loc = new PVector (mouseX, mouseY);
  vel = new PVector (5,5);
}

void draw()
{
  println(whenXDoesYouWrong(1,9,-10));
  println(springInMyStep(807.7,0.13,'w'));
  println(springInMyStep(8.32,600,'x'));
  println(springInMyStep(10,3.56,'k'));
  followMrMouse();
}

float[] whenXDoesYouWrong(float a, float b, float c)
{
  float[]x = new float[2];
  x[0] = -b + (sqrt(sq(b) - 4*a*c))/2*a;
  x[1] = -b - (sqrt(sq(b) - 4*a*c))/2*a;
  return x;
}

float springInMyStep (float a, float b, char isolate)
{
  float result = 0;
  if(isolate == 'w')
  {
    result = 0.5*a*sq(b);
  }
  if(isolate == 'x')
  {
    result = sqrt((2*b)/a);
  }
  if(isolate == 'k')
  {
    result = (2*b)/sq(a);
  }
  return result;
}

void followMrMouse()
{
  ellipse(loc.x,loc.y, diam, diam);
  loc.add(vel);
  if (loc.x > mouseX+20)
  {
    vel.x = -abs(vel.x);
  } else if (loc.x < mouseX-20) {
    vel.x = abs(vel.x);
  }
  if (loc.y > mouseY+20)
  {
    vel.y = -abs(vel.y);
  } else if (loc.y < mouseY-20) {
    vel.y = abs(vel.y);
}
}