cheers for the help but why did you took out mousepressed and mouse onrelease. The A part of this assigment is when the user clicks it draws the first brush and on release it draws the second brush. The b part is the mousedragged one which draws the 3 brushes altering between them which you helped me on. I am really glad for the help. I was getting worried about it. Thanks a million. So where do i put the mousepressed and mouse onrelease now?

I think i fixed it now. It's working perfectly the way it's suppose to. Cheer for you help. If i need more help on my assignment. I'll post it here. Also is it possible to explain a bit what framecount and what random function is doing in drawing the brushes.

here is the code

1. int brushSize = 50;
2. int rnd;
3. void setup() {
4.   size(500, 500);
5.   background(255);
6.   smooth();
7. }
8. void draw() {
9.   if (frameCount % 10 == 0) {
10.     rnd = int(random(3));
11.   }
12. }
13. void mousePressed() {
14.   fill(0, 0, 219);
15.   ellipse(mouseX, mouseY, brushSize, brushSize);
16. }
17. void mouseReleased() {
18.   fill(0, 249, 219);
19.   rect(mouseX, mouseY, brushSize, brushSize);
20. }
21. void mouseDragged() {
22.   if (rnd == 0) {
23.     brush1();
24.   }
25.   if (rnd == 1) {
26.     brush2();
27.   }
28.   if (rnd == 2) {
29.     brush3();
30.   }
31. }
32. void keyPressed() {
33.   if (key == ' ') {
34.     background(255);
35.   }
36. }
37. void brush1() {
38.   fill(0, 0, 219);
39.   ellipse(mouseX, mouseY, brushSize, brushSize);
40. }
41. void brush2() {
42.   fill(0, 249, 219);
43.   rect(mouseX, mouseY, brushSize, brushSize);
44. }
45. void brush3() {
46.   fill(249, 0, 219);
47.   triangle(mouseX-brushSize, mouseY, mouseX+brushSize, mouseY, mouseX, mouseY-brushSize);
48. }

ok i'll try that. I have bunch of exercises which i have to finish. Like this one. my mouse dragg isn't working. It's not drawing my brush
Create a Brush class, based on one of your four brushes. Write a sketch that uses that class such that the brush gets drawn whenever the user drags the mouse. Here is my code
This is my class brush. Also my brush code is bad basically i am trying to make this as my new brush. I know it sucks:) i am working on it since there are too many variables going on and i get confused.

1. stroke(1);
2.   fill(0, 0, 219);
3.   ellipse (x+200, y+200, width/2, height/2);
4.   fill(255);
5.   noStroke();
6.   rectMode(CENTER);
7.   rect (x+200, y+200, (width-150)/2, (height-150)/2);
8.   noStroke();
9.   fill(209, 0, 219);
10.   ellipse (x+200, y+200, (width-100)/2, (height-100)/2);

1. class Brush {
2.   /* attributes */
3.   int xBrushPos;    // x-coordinate of the brush
4.   int yBrushPos;    // y-coordinate of the brush
5. 
   
6.   /* Methods */
7.   // Constructor
8.   public Brush(int BrushX, int BrushY,) {
9.     xBrushPos = BrushX;
10.     yBrushPos = BrushY;
11.   
    
12.   }
13.   // Moves the brush to its desired location
14.   void move(int newX, int newY) {
15.     xBrushPos = newX;
16.     yBrushPos = newY;
17.     bSize = newBrush;
18.   }
19.   // draws the brush
20.   void draw() {
21.     noStroke();
22.     fill(0, 0, 219);
23.     ellipse (xBrushPos, yBrushPos, bSize/2, bSize/2);
24.     noStroke();
25.     fill(0, 210, 219);
26.     rectMode(CENTER);
27.     rect (xBrushPos, yBrushPos, (width-bSize)/2, (height-bSize)/2);
28.     noStroke();
29.     fill(209, 0, 219);
30.     ellipse (xBrushPos-bSize/10, yBrushPos-bSize/10, bSize, bSize);
31.   }
32. }

and this is my sketch calling that class

1. // -------------------------------------
2. // GLOBAL VARIABLE
3. // --------------------------------------
4. Brush aBrush;
5. // -------------------------------------
6. // BUILT-IN FUNCTIONS
7. // -------------------------------------
8. void setup() {
9.   smooth();
10.   size(400, 400);
11.   background(255);
12. }
13. void mouseDragged () {
14.   aBrush.move(mouseX,mouseY);
15.  
16. }
17. void draw () {
18.   aBrush.draw();
19. }

1. hi i have another exercise where i have to draw my brush in each quadrant but it's drawing weird. I dunno why. here is the code
2. void setup ()
3. {
4.   background (255);
5.   size (400, 400);
6.   frameRate(50);
7.   smooth ();
8. }
9. //Draws brushes
10. void draw()
11. {
12.   float MSize, SMSize;
13.   //Calculates how fast the mouse is moving
14.   MSize=dist(pmouseX, pmouseY, mouseX, mouseY);
15.   SMSize=dist(pmouseX, pmouseY, mouseX, mouseY);
16.   SMSize += 25;
17.   // placements per quadrant
18.   if (mousePressed)   {
19.     if (mouseX < width/2 && mouseY < height/2) {
20.      
21.     }
22.     else if (mouseX > width/2 && mouseY < height/2) {
23.      
24.     }
25.     else if (mouseX < width/2 && mouseY > height/2) {
26.      
27.     }
28. 
    
29.     //Brush
30.     brush(mouseX, mouseY, MSize+20);
31.   }
32.   //Spacebar clears page
33.   if (keyPressed) {
34.     if (key == ' ') {
35.       background (255);
36.     }
37.   }
38. }
39. //Brush
40. void brush (int xBrushPos, int yBrushPos, float bSize)
41. {
42. //  rectMode (CENTER);
43. //  ellipseMode (CENTER);
44.   //Brush changes per quadrant
45.   if (xBrushPos < width/2 && yBrushPos < height/2)
46.   {
47.     fill(0, random(210), 219);
48.     rect (xBrushPos, xBrushPos, bSize*random(3), bSize*random(3));
49.     fill(209, 0, 219);
50.     ellipse (xBrushPos, yBrushPos, bSize, bSize);
51.     fill(0, 0, 219);
52.     ellipse (xBrushPos+random(-bSize, bSize), yBrushPos+random(-bSize, bSize), bSize/2, bSize/2);
53.   }
54.   else if (xBrushPos < height/2 && yBrushPos > height/2)
55.   {
56.     fill(0, random(210), 219);
57.     rect (xBrushPos, xBrushPos, bSize*random(3), bSize*random(3));
58.     fill(209, 0, 219);
59.     ellipse (xBrushPos, yBrushPos, bSize, bSize);
60.     fill(0, 0, 219);
61.     ellipse (xBrushPos+random(-bSize, bSize), yBrushPos+random(-bSize, bSize), bSize/2, bSize/2);
62.   }
63.   else if (xBrushPos > height/2 && yBrushPos < height/2)
64.   {
65.     fill(0, random(210), 219);
66.     rect (xBrushPos, xBrushPos, bSize*random(3), bSize*random(3));
67.     fill(209, 0, 219);
68.     ellipse (xBrushPos, yBrushPos, bSize, bSize);
69.     fill(0, 0, 219);
70.     ellipse (xBrushPos+random(-bSize, bSize), yBrushPos+random(-bSize, bSize), bSize/2, bSize/2);
71.   }
72.   else
73.   {
74.     fill(0, random(210), 219);
75.     rect (xBrushPos, xBrushPos, bSize*random(3), bSize*random(3));
76.     fill(209, 0, 219);
77.     ellipse (xBrushPos, yBrushPos, bSize, bSize);
78.     fill(0, 0, 219);
79.     ellipse (xBrushPos+random(-bSize, bSize), yBrushPos+random(-bSize, bSize), bSize/2, bSize/2);
80.   }
81. }