class DataCircle{                    // creates a class named DataCircle  
  int circleSize;                  // creates a property (aka instance variable) called circleSize of type int
  color circleColor;               // creates a property called colorColor that will store a color object
  int x;                         // creates a property called x that will store an int
  int y;                         // creates a property called y that will store an int
  int z;                         // creates a property called z that will store an int
  
  DataCircle(int cSize, color cColor, int cx, int cy, int cz) {      // defines the method used to create a DataCircle object...
                                                         // ... this method accepts four parameters....
                                                         // ... the first is an int for the size, the second is...
                                                         // ... a color object, and the last two are ints
    circleSize = cSize;       // sets the property circleSize to equal whatever was received in rSize
    circleColor = cColor;     // sets the property circleColor to equal whatever was received in rColor
    x = cx;                 // sets the property x to equal whatever was received in cx
    y = cy;                 // sets the proeprty y to equal whatever was received in cy
    z = cz;                 // sets the proeprty z to equal whatever was received in cy
  }
  
  DataCircle(DataNode n){
    String type = n.carName;
    int date = n.date;
    float miles = n.mileage;
    float price = n.gasPrice;
    
    circleSize = 50;
    
    if (type.equals("Taurus")) {
      int rand = (int) random(50);
      circleColor = color(50 + rand, 10 + random(10), 50 + rand);
    }
    else if (type.equals("Matrix"))
      circleColor = color(10 + random(50), 20 + random(50), 90 + random(150));
    else if (type.equals("Civic"))
      circleColor = color(90 + random(150), 20 + random(50), 10 + random(50));
    else
      circleColor = color(0,255,0);
 
    x = date*3;
    y = (int) (miles * -100);
    z = (int) (price * 1000);
  }
  
  
  void changeSize(int num) {
    circleSize += num;  
  }
  
  void display() {
    fill(circleColor);    // set the fill color to be whatever is store in this object's circleColor property
    pushMatrix();
    translate(x,y,z);
    sphere(circleSize);  // draw the sphere of size circleSize
    popMatrix();
  }
}