Im working on  a slot machine program. it should at least be displaying some  of it, but for one reason or another i just get a small screen.   

2. int clickcount = 0;
3. class Slot {
4.   float num1;
5.   int adder;//number that adds up slot number
6.   
7.   Slot() {
8.     num1=1;
9.     adder=1;
10.   }
11.   
12.   void calculate() {
13.     num1 = num1 + adder;
14.     if (num1 >= 10 || num1 < 1) {
15.       adder = -adder;
16.     }
17.   }
18.   
19.   void display() {
20.     stroke(0,0,255);
21.     rect(230,230,40,40);//box for slot
22.     text(num1,250,250);//displays slot with number being calculated
23.   }
24.     
25.   void mouseClicked(){
26.     num1= num1;
27.     clickcount = clickcount + 1;
28.   }
29.  
30.  Slot slot;
31.   void setup(){
32.     size(500,500);
33.     slot = new Slot();
34.   }
35. 
    
36.   void draw() {
37.     slot.calculate();
38.     slot.display();
39.     
40.     background(0);  
41.   }
42. }