Processing is low level, so you just have to draw your text with a vertical offset, according to the scrollbar value.

well, I scribbled together a small "solution" with phi.lhos advice.
Now left scrollbar is for textposition and right scrollbar for allowed text height (try moving the right bar up).

But I guess that's not what the poor guy wants...

He rather wants a fixed box and scroll the data within... I guess.

I haven't done that, probably you would have to manipulate start and end of

1.   for (int j = 0; j<dataSubSet.size(); j++) {

instead of text();


Greetings, Chrisir 

1. VScrollbar vs1, vs2;
2. int offset = 0;
3. String[] dataSubSet = { 
4.   "This", "will", "probably", "take", "literally", "ages", "to", "figure", "out", "again.",
5.   "This", "will", "probably", "take", "literally", "ages", "to", "figure", "out", "again.",
6.   "This", "will", "probably", "take", "literally", "ages", "to", "figure", "out", "again.",
7.   "This", "will", "probably", "take", "literally", "ages", "to", "figure", "out", "again."
8. };
9. //
10. void setup()
11. {
12.   size(900, 900);
13.   noStroke();
14.   vs1 = new VScrollbar(10, 0, 20, height, 3*5+1);
15.   vs2 = new VScrollbar(width-10, 0, 20, height, 3*5+1);
16. }
17. void draw()
18. {
19.   background(255);
20.   // Get the position of the left scrollbar
21.   // and convert to a value to display the text (pos X)
22.   float offset = vs1.getPos()-height+550;
23.   fill(255);
24.   // Get the position of the right scrollbar
25.   // and convert to a value to display the allowed height of the text rect
26.   float AllowedHeight = vs2.getPos()-width/2 + 255;
27.   fill(255);
28.   println ("offset " + offset+"; AllowedHeight: "+ AllowedHeight);
    
29.   int y= 20;
30.   int allowedHeight = 70 ;
31.   String myString="";
32.   for (int j = 0; j<dataSubSet.length-4; j+=4) {
33.     myString= myString
34.       +j
35.       +dataSubSet[j]+" "
36.       +dataSubSet[j+1]+" "
37.       +dataSubSet[j+2]+" "
38.       +dataSubSet[j+3]
39.       +"\n";
40.   }
41.   fill(0);
42.   // using text(stringdata, x, y, width, height)
43.   text(myString, 30, y+offset, screen.width, AllowedHeight );
44.   vs1.update();
45.   vs2.update();
46.   vs1.display();
47.   vs2.display();
48. }
49. // ================================================
50. class VScrollbar
51. {
52.   int swidth, sheight;    // width and height of bar
53.   int xpos, ypos;         // x and y position of bar
54.   float spos, newspos;    // x position of slider
55.   int sposMin, sposMax;   // max and min values of slider
56.   int loose;              // how loose/heavy
57.   boolean over;           // is the mouse over the slider?
58.   boolean locked;
59.   float ratio;
60.   VScrollbar (int xp, int yp, int sw, int sh, int l) {
61.     swidth = sw;
62.     sheight = sh;
63.     int heighttowidth = sh - sw;
64.     ratio = (float)sh / (float)heighttowidth;
65.     xpos = xp-swidth/2;
66.     ypos = yp;
67.     spos = ypos + sheight/2 - swidth/2;
68.     newspos = spos;
69.     sposMin = ypos;
70.     sposMax = ypos + sheight - swidth;
71.     loose = l;
72.   }
73.   void update() {
74.     if (over()) {
75.       over = true;
76.     }
77.     else {
78.       over = false;
79.     }
80.     if (mousePressed && over) {
81.       locked = true;
82.     }
83.     if (!mousePressed) {
84.       locked = false;
85.     }
86.     if (locked) {
87.       newspos = constrain(mouseY-swidth/2, sposMin, sposMax);
88.     }
89.     if (abs(newspos - spos) > 1) {
90.       spos = spos + (newspos-spos)/loose;
91.     }
92.   }
93.   int constrain(int val, int minv, int maxv) {
94.     return min(max(val, minv), maxv);
95.   }
96.   boolean over() {
97.     if (mouseX > xpos && mouseX < xpos+swidth &&
98.       mouseY > ypos && mouseY < ypos+sheight) {
99.       return true;
100.     }
101.     else {
102.       return false;
103.     }
104.   }
105.   void display() {
106.     fill(255);
107.     rect(xpos, ypos, swidth, sheight);
108.     if (over || locked) {
109.       fill(255, 255, 0);
110.     }
111.     else {
112.       fill(255, 0, 0);
113.     }
114.     rect(xpos, spos, swidth, swidth);
115.   }
116.   float getPos() {
117.     // Convert spos to be values between
118.     // 0 and the total width of the scrollbar
119.     return spos * ratio;
120.   }
121. }