Hello.

I've done something like this (which works great),
where you can move top points of the triangle:

2. class Point {
3.   public float x, y;
4.   Point(float x, float y){ this.x = x; this.y = y; }
5. }
6. 
   
7. Point p1, p2, p3;
8. int iter;
9. int over;
10. Boolean drag;
11. float zoom;
12. 
    
13. void setup() {
14.   size(555, 555, P2D);
15.   smooth();
16.   iter = 2;
17.   over = 0;
18.   drag = false; 
19.   zoom = 1.0;
20.   
21.   p1 = new Point( 100.0*zoom, 400.0*zoom );
22.   p2 = new Point( 250.0*zoom, 150.0*zoom );
23.   p3 = new Point( 400.0*zoom, 400.0*zoom );
24. }
25. 
    
26. void mouseDragged() {
27.   if( over == 0 ) return;
28.   if( over == 1 ) p1 = new Point(mouseX*(1.0/zoom), mouseY*(1.0/zoom)); // dolny lewy
29.   if( over == 2 ) p2 = new Point(mouseX*(1.0/zoom), mouseY*(1.0/zoom)); // górny
30.   if( over == 3 ) p3 = new Point(mouseX*(1.0/zoom), mouseY*(1.0/zoom)); // dolny prawy
31. }
32. 
    
33. void mousePressed() {
34.   if( over > 0 )drag = true;
35. }
36. 
    
37. void mouseReleased() {
38.   drag = false;
39. }
40. 
    
41. void updateHover() {
42.   if( drag ) return;
43.   over = 0;
44.   if( overCircle(p1.x, p1.y, 10) ) over = 1;
45.   if( overCircle(p2.x, p2.y, 10) ) over = 2;
46.   if( overCircle(p3.x, p3.y, 10) ) over = 3;
47. }
48. 
    
49. boolean overCircle(float x, float y, int diameter) {
50.   float disX = (x*zoom) - mouseX;
51.   float disY = (y*zoom) - mouseY;
52.   if(sqrt(sq(disX) + sq(disY)) < diameter/2 ) return true;
53.   else return false;
54. }
55. 
    
56. void draw() {
57.   updateHover();  
58.   background(#FFFAFA);
59.   beginShape();
60.     fill((color)103,105,168); // -----------------------------------------------> kolor Trójkąta Sierpińskiego...
61.     noStroke();
62.     vertex(p1.x, p1.y);
63.     vertex(p2.x, p2.y);
64.     vertex(p3.x, p3.y);
65.   endShape();
66.      
67. // kolor `punktów kontrolnych`  
68.   if( over == 1 ){ fill(#00FF00); stroke(#00FF00); } else{ fill((color)103,105,168); stroke((color)103,105,168); }
69.   ellipse(p1.x, p1.y, 7, 7);
70.   if( over == 2 ){ fill(#00FF00); stroke(#00FF00); } else{ fill(#000000); stroke(#000000); }
71.   ellipse(p2.x, p2.y, 7, 7);
72.   if( over == 3 ){ fill(#00FF00); stroke(#00FF00); } else{ fill(#000000); stroke(#000000); }
73.   ellipse(p3.x, p3.y, 7, 7);
74. }

And now appears my problem. I made another application with a new window.

This is a very similar application (almost the same...) and has a bit more than 70 lines, but with classes takes almost 400 lines. My class (Point) takes only a few lines, class ExtraWindow (made by someone else) is much bigger/longer. Still it's to big to post here because of the limits, so I pasted the code into the following link: http://wklej.org/id/369642/txt/ // of course it's safe, after opening the code appears and it's very easy to copy

And now my problems/questions to the linked code above...

1) In a new window I can't move 3 top points. How can I solve it?