makes a colorful cardioid!

cardioid.pde

// declares the universal variables: r (radius) and theta (the angle)
float r; 
float theta;

//sets up the program.
void setup(){
  size(600, 600);//*
  r = height * .25;// radius is 1/4 of the height. (this doesn't matter later)
  theta = 0;//*
  background(0);//*
  frameRate(1000);//*
}
void draw() {
  stroke(random(255), random(255), 255);// makes a random color (always has blue in it).*
  strokeWeight(random(5));// makes a random stroke thickness.*
  translate(width/2, height/2);// moves the top left of the grid to the center of the canvas.*
  
  // this translates cartesian coordinates into polar coordinates.
  float x = r*sin(theta) ;
  float y = r*cos(theta) ;
  
  point(x, y);// makes a point at the specified x and y.
  theta+=1; // increases theta by 1.
  
  // this is the equation for a cardioid: r = x + x(sin(theta)). 
  // we have renamed "x" as "xc" because x has already been used for the coordinates.
  // feel free to change "xc"!
  float xc = 100;
  r = xc+xc* sin(theta);
  
  // clears the canvas and starts over the process.
  if (theta == 360){//*
    background(0);//*
    theta = 0;//*
  }
}
// *feel free to play around with the variables in these lines.