Hey people!

I'm trying to draw pictures in a canvas. The pics should grow according to the position of the mouse. When i do this I'm getting an "ArrayIndexOutOfBoundsException: Coordinate out of bounds!" in line 51. If i draw a rectangle instead of a picture it works just fine. I'm new to Processing and i think there is something wrong with my class.
Looking forward to some answers and wish u happy coding!

THX,
Anorak

1. int a = 3,index,z, Xstart, Ystart;
2. Pictures[] myArray;
3. 
   
4. void setup( ) {
5.   size(400, 400);
6.   myArray = new Pictures[a];
7.   PImage img = loadImage("lordhelmchen.jpg");
8.   for (int i = 0; i < 3; i++) {
9.     myArray[index++] = new Pictures(img);
10.   }
11. }
12. 
    
13. void draw( ) {
14.   background( 0 );
15.   if(mousePressed == true) {
16.     myArray[z].update(Xstart, Ystart);
17.     myArray[z].draw(Xstart, Ystart);
18.   } 
19. }
20. 
    
21. void mousePressed( ) { 
22.   Xstart = mouseX;
23.   Ystart = mouseY;
24. }
25. 
    
26. void mouseReleased( ) {
27.   z++;
28. }
29. 
    
30. class Pictures {
31.   PImage img;
32.   int Xstart, Ystart, Xend, Yend,  Xb, Yb;
33.  
34.   Pictures(PImage pic) {
35.     img = pic;
36.   }
37.  
38.   void update(int Xstart, int Ystart) {
39.     Xend = mouseX;
40.     Yend = mouseY;
41.     println("Start " + Xstart + "," + Ystart);
42.     println("End " + Xend + "," + Yend); 
43.   }
44.  
45.   void draw(int Xstart, int Ystart) {   
46.     Xb = (Xstart < Xend)? Xstart : Xend;
47.     Yb = (Ystart < Yend)? Ystart : Yend;
48.     img.resize(abs(Xend - Xstart), abs(Yend - Ystart));   
49.     println("BBB " + Xb + "," + Yb);
50.     if (Xstart != Xend && Ystart != Yend) {   
51.       image(img, Xb, Yb);
52.     }   
53.     //rect(Xstart, Ystart, Xend-Xstart, Yend-Ystart);  
54.   }
55. }