RaymondZuo301_processing/The Nature of Code/C2_3_motion_liquid/Liquid.pde
class Liquid{
  float x, y, w, h;
  float c;
  
  Liquid(float x_, float y_, float w_, float h_, float c_){
    x = x_; y = y_; w = w_; h = h_; c = c_; 
  }
  
  void display(){
    noStroke();
    fill(175);
    rect(x, y, w, h);
  }
}