Getting the color from its same location, so I can blur the picture with the potentiometer by increasing and reducing the size of the squares.

Unfortunately I keep getting this message:

This is the code. Any suggestion will be much appreciated!

2. import processing.serial.*;
3. Serial myPort;
4. PImage myImage;
5. 
   
6. void setup() {
7.   size(500, 399);
8.   // List all the available serial ports
9.   println(Serial.list());
10.   // I know that the first port in the serial list on my mac
11.   // is always my  Arduino, so I open Serial.list()[0].
12.   // Open whatever port is the one you're using.
13.   myPort = new Serial(this, Serial.list()[4], 9600);
14.   // don't generate a serialEvent() unless you get a newline character:
15.   myPort.bufferUntil('\n');
16.   imageMode(CENTER);
17.   myImage = loadImage("rdjr.jpg");
18.   image(myImage, width/2, height/2);
19.   noStroke();
20. }
21. 
    
22. void draw() {
23. }
24. 
    
25. void serialEvent( Serial myPort) {
26. 
    
27.   // get the ASCII string:
28.   String inString = myPort.readStringUntil('\n');
29. 
    
30.   if (inString != null) {
31.     // trim off any whitespace:
32.     inString = trim(inString);
33.     // convert to an int and map to the screen:
34. 
    
35.     for ( int i = 0; i < 1000; i++) {
36. 
    
37.       float inByte = float(inString); 
38.       float diagonal = dist(0, 0, width, height);
39.       inByte = map(inByte, 0, 1023, 0, diagonal);
40. 
    
41.       int x = int(random(0, width));
42.       int y = int(random(0, height));
43. 
    
44.       color getColor = myImage.get(x, y);
45.       fill(getColor, 50);
46. 
    
47.       rect(x, y, inByte, inByte);
48.     }
49.   }
50. 
    
51.   println(inString);
52. }

I am trying to figure it out how to check collision detection outside the class, but it seems not to be working. Here is what I came up with:

2. //Ball ball1;
3. Ball [] balls = new Ball [50];
4. 
   
5. 
   
6. 
   
7. 
   
8. 
   
9. void setup() {
10. 
    
11.   size(500, 500);
12. 
    
13.   for (int i=0; i < balls.length; i++) {
14. 
    
15.     int x = int(random(30, 300));
16.     int y = int(random(20, 400));
17.     int speedX = int(random(1, 10));
18.     int speedY = int(random(1,10));
19.     color filler1 = color(random(0,255),0,0);
20.     int diam = int(random(20,50));
21.     
22.     
23.     
24. 
    
25.     balls[i] = new Ball(x, y, speedX, speedY, diam, filler1);
26.     //  ball1 = new Ball(50,100,2,40);
27.     //  ball2 = new Ball(0,300,5,100);
28.   }
29. }
30. 
    
31. 
    
32. void draw() {
33. 
    
34.   background(255);
35.   
36.   for (int i=0; i < balls.length; i++) {
37.     
38.     balls[i].animate();
39.     balls[i].display();
40.     
41.   }
42.   
43.    for (int j = 0; j < balls.length; j++){
44.      for( int k = 0; k < balls.length; k++){
45.      
46.        if( dist(balls[j].posX, balls[j].posY, balls[k].posX, balls[k].posY) >= diam[j] + diam[k]){
47.          ballSpeedX[j] *= -1;
48.          ballSpeedY[j] *= -1;
49.        }
50.      }
51.    }
52.    
53.          
54.   
55. }  
56.  

 *The problem is that the variable "diam" is not recognized. 

And this is for the class

2. class Ball {
3. 
   
4. 
   
5.   int posX;
6.   int posY;
7.   int ballSpeedX;
8.   int ballSpeedY;
9.   int ballDiam;
10.   color filler;
11.   
12. 
    
13.   Ball(int tempPosX, int tempPosY, int tempBallSpeedX, int tempBallSpeedY, int tempBallDiam, int tempFiller) {
14.     posX = tempPosX;
15.     posY = tempPosY;
16.     ballSpeedX = tempBallSpeedX;
17.     ballSpeedY = tempBallSpeedY;
18.     filler = tempFiller;
19.     ballDiam = tempBallDiam;
20.     
21.   }
22. 
    
23.   void display() {
24.     fill(filler);
25.     ellipse(posX, posY, ballDiam, ballDiam);
26.   }
27. 
    
28.   void animate() {
29. 
    
30.     posX += ballSpeedX;
31.     posY += ballSpeedY;
32.     if (posX > width-ballDiam || posX <= 0+ballDiam) {
33.       ballSpeedX = -ballSpeedX;
34.     }
35.     if(posY > height-ballDiam || posY <= 0+ballDiam){
36.       ballSpeedY = -ballSpeedY;
37.       
38.    
39.   
40.   }
41. }
42. }

So I am working on this drawing tool for 8 bit games. It is a school assignment. And I pretty much have it figured out. I just wanted to add a last feature which is turning off the grid that is is used to draw the pixels before you save it, but I have not accomplished it. I figured it out on the void setup but since I have everything on the void draw it does not seem to work. Any suggestions are more than welcome, here is the code for the program and at the end is my temporary solution that when incorporated did not work:

2. int xPos;
3. int yPos;
4. 
   
5. int wRect;
6. int hRect;
7. 
   
8. PFont myFontPixelizer;
9. PFont myFontPixelizer2;
10. int  fontPosX = 30;
11. int fontPosY = 30;
12. color pixelColor;
13. 
    
14. boolean unload = false;
15. int saveP = 1;
16. 
    
17. PImage myImage; 
18. PImage myImage1;
19. PImage temp;
20. PImage a;
21. 
    
22. 
    
23. void setup() {
24.   size(650, 650);
25.   myImage = loadImage("colorpalette.jpeg");
26.   myImage1 = loadImage("mario.png");
27.   a = loadImage("grid.png");
28.   frame.setTitle("|| Pixelizer v1.3 ||");
29.   frame.setLocationRelativeTo(null);
30.   smooth();
31.   pixelColor= myImage.get(mouseX, mouseY);
32.   myFontPixelizer= loadFont("GB18030Bitmap-48.vlw");
33.   //  gridOn = false;
34.   myFontPixelizer2= loadFont("GB18030Bitmap-14.vlw");
35.   smooth();
36.   background(255);
37.   
38.         if(!unload){
39.     image(a,200,200);
40.     
41.   }
42.   if( key =='g'){
43.     unload=true;
44.   }
45. }
46. 
    
47. void draw() {
48.   //Title---------------------------------->
49.   image(myImage, 30, 310);
50.   image(myImage1, 30, 90);
51.   textFont(myFontPixelizer);
52.   text("Pixelizer", 30, 70);
53.   fill(pixelColor);
54.   //Define my variables and functions 
55.   //  mousePixel();
56.   instructions();
57.   noStroke();
58. 
    
59.   //Get color------------------------------->
60.   if (keyPressed && key == 'c') {
61.     //  if (key == 'c') {
62.     pixelColor = myImage.get(mouseX - 30, mouseY - 310);
63.   }
64. 
    
65.   //Grid------------------------------------>
66.     for (int i = 0; i <= 400 ; i= i+20) {
67.       for (int j = 0; j <= 400 ; j= j+20) {
68.         rect(200+i, 200+j, 20, 20);
69.         noStroke();
70.       }
71.     }
72.  } 
73.  
74. 
    
75. 
    
76. 
    
77. void keyTyped() {
78. 
    
79.   if ( key == 's') {
80.     PImage temp = get(200, 200, 420, 420);
81.     temp.save("image"+saveP+".png");
82.     saveP++;
83.   }
84. }
85. 
    
86. void instructions() {
87.   noFill();
88.   textFont(myFontPixelizer2);
89.   text(" Use the Grid to draw Mario press 's' to save \n press 'c' on the color palette to get color \n mouse click on the center of \n each square to draw a pixel", 200, 100);
90. }
91. 
    
92. void mousePressed() {
93. 
    
94.   for (int i = 200; i < 620 ; i+=20) {
95.     for (int j = 200; j < 620; j+=20) {
96.       if (mouseX > i && mouseX <= i+20) {
97.         if (mouseY > j && mouseY <= j+20) {
98.           fill(pixelColor);
99.           rect(i, j, 20, 20);
100.         }
101.       }
102.     }
103.   }
104. }

temporary solution:

2. boolean grid = true;
3. 
   
4. void setup() {
5.   background(230);
6.   size(500, 500);
7.   ellipseMode(CORNER);
8. }
9. 
   
10. void draw() {
11.   background(127);
12. 
    
13.   if (grid) {
14.     for (int i = 0; i < 240 ; i+=30) {
15.       for (int j = 0; j < 240; j+=30) {
16.         rect(i, j, 30, 30);
17.       }
18.     }
19.   }
20.   println(grid);
21. }
22. 
    
23. 
    
24. void keyPressed() {
25.   if (key == 'g' && grid == true) {
26.     grid = false;
27.   } 
28. 
    
29.   else if ((key == 'g') && grid == false) {
30. 
    
31.     grid = true;
32.   }
33. }

I am trying to make a drawing tool for pixel images, so I want to have a color palette(Image) so that when you hover on it in a certain position and press the 'c" key it takes the color from that pixel and puts in in a color variable, and then draw a square with the color acquired from that pixel, but have the chance of doing it many times. I haven't gotten it to work totally, at least it runs the application but doesn't pick a color specifically. Any help will be much appreciate it.

Here is the code: