I am not getting any error messages. It's just the brush i made is one brush meaning the square is drawing somewhere else and the ellipses are drawing apart from each other. It's one brush. If i move my brush anywhere on the screen it should draw as one brush per quadrent not apart from each other. I hope it's clear now.

you can see the example here.

1. http://hybrid.concordia.ca/cart253/assignments/a_3/examples/nosource/a3_3/index.html

so any help with the code?

here is the proper description

Write a program where the brush that is used depends on which quadrant you are in. In other words, if the mouse is clicked and/or dragged in the upper-left section of the display, draw brush 1; if in the lower-left section, draw brush 2; etc. You will have to design and implement a fourth brush for this problem. The user should be able to clear the display by hitting the space bar

i did this but it's pretty messy. Your solution is pretty neat and clean. Cheers mate. Appreciate the effort. I have one more question. I have one last exercise and my assignment is due tomorrow. How would you go by creating something like this below

1. http://hybrid.concordia.ca/cart253/assignments/a_3/responses/a/Lamothe,Shannis/A3_7/applet/index.html

1. int brushSize = 50;

1. void setup ()
2. {
3.   background (255);
4.   frameRate(50);
5.   size (400, 400);
6.   smooth ();
7. }
8. //Draws brushes
9. void draw()
10. {
11.   float sizeOfMouse, SMSize;
12.   //Calculates how fast the mouse is moving
13.   sizeOfMouse=dist(pmouseX, pmouseY, mouseX, mouseY);
14.   SMSize=dist(pmouseX, pmouseY, mouseX, mouseY);
15.   SMSize += 25;
16.   // draws per quadrant
17.   if (mousePressed) {
18.     if (mouseX < width/2 && mouseY < height/2) {
19.       brush(mouseX, mouseY, sizeOfMouse+15);
20.     }
21.     else if (mouseX > width/2 && mouseY < height/2) {
22.       brush(mouseX, mouseY, sizeOfMouse+15);
23.     }
24.     else if (mouseX < width/2 && mouseY > height/2) {
25.       brush(mouseX, mouseY, sizeOfMouse+15);
26.     }
27.     //Brush
28.     brush(mouseX, mouseY, sizeOfMouse+20);
29.   }
30.   //Spacebar clears page
31.   if (keyPressed) {
32.     if (key == ' ') {
33.       background (255);
34.     }
35.   }
36. }
37. //Brush
38. void brush (int xBrushPos, int yBrushPos, float bSize)
39. {
40.   //Brush changes per quadrant
41.   if (xBrushPos < width/2 && yBrushPos < height/2)
42.   {
43.     fill(0, random(210), 219);
44.     rect (xBrushPos, xBrushPos, bSize*random(3), bSize*random(3));
45.     fill(209, 0, 219);
46.     ellipse (xBrushPos, yBrushPos, bSize, bSize);
47.     fill(0, 0, 219);
48.     ellipse (xBrushPos+random(-bSize, bSize), yBrushPos+random(-bSize, bSize), bSize/2, bSize/2);
49.   }
50.   else if (xBrushPos < height/2 && yBrushPos > height/2)
51.   {
52.     fill(0, 0, 219);
53.     ellipse(mouseX, mouseY, brushSize, brushSize);
54.   }
55.   else if (xBrushPos > height/2 && yBrushPos < height/2)
56.   {
57.     fill(0, 249, 219);
58.     rect(mouseX, mouseY, brushSize, brushSize);
59.   }
60.   else
61.   {
62.     fill(249, 0, 219);
63.     triangle(mouseX-brushSize, mouseY, mouseX+brushSize, mouseY, mouseX, mouseY-brushSize);
64.   }
65. }

is this for the example i showed you? for the last exercise?

Hi i am trying to do this but with the logo function. I just want to replace the ellipses and rect with the logo function and get the same effect.
void setup()  
{ 
  size(400, 400);  
  noStroke(); 
  rectMode(CENTER);
} 

void mouseDragged()  
{    
  interact();
}

void draw (){
}
//
void interact () {
  background(51);  
  fill(255, 80, 190);
  ellipse(width-mouseX, height/2, ((height-mouseY)/2)+10, ((height-mouseY)/2)+10);
  fill(55, 80,105);
  ellipse(mouseX, height/2, mouseY/2+10, mouseY/2+10); 
  fill(0, 80,219); 
  rect(width-mouseX+random(3), height/2, ((height-mouseY)/2)+10, ((height-mouseY)/2)+10);
  fill(200, random(70), 119); 
  rect(width-mouseX, height/5, ((height-mouseY)/5)+10, ((height-mouseY)/5)+10);
}
  void Rlogo()
  {
   
    stroke (0);
    strokeWeight (LSize/30);
    fill (#860000);
    ellipse (xPos, yPos, LSize, LSize);
    fill (0);
    stroke (0);
    strokeWeight (LSize/30);
    ellipse (xPos, yPos, LSize/2, LSize-LSize/15);
    ellipse (xPos, yPos, LSize-LSize/10, LSize/2);
    fill (#558843);
    ellipse (xPos, yPos, LSize-LSize/4, LSize-LSize/5);
    textAlign (CENTER, CENTER);
    textSize (LSize/2+LSize/3);
    fill (0);
    text ("F", xPos, yPos-LSize/12);
    fill (#860000);
    text ("R", xPos-LSize/30, yPos-LSize/12);
  }