Help with a "Drawing" App

Processing Coding Questions
3

there is a not so nice but more easy way of slider i call
MouseWheelPlusPlus
and not need extra settings window as it uses console to show info.

// painter_basic_mousewheelplusplus

void setup() {
  size(300, 300);
  println("use: \n[s] for save picture\n mousewheelplusplus: press\n[r] red\n[g] green\n[b] blue\n[w] brushsize\nand turn mousewheel");
  fill(brush);
  noStroke();
  background(255);
}

void draw() {
  // drawing mode  background(200,200,0);
  if ( mousePressed ) circle(mouseX, mouseY, wval);
}

//_______________________________________________ OPERATION Mouse Wheel Plus Plus
int rval, gval, bval;               // drawn circle fill color RGB
color brush =color(0, 0, 0, 255);
int wval=5;                         // brush size
String outfile = "data/mypic.png";

void mouseWheel(MouseEvent event) {   // move mouse wheel
  float e = 2*event.getCount();
  if ( keyPressed && key == 'r' ) { 
    rval += e;
    rval = constrain(rval, 0, 255);
  }  
  if ( keyPressed && key == 'g' ) { 
    gval += e;
    gval = constrain(gval, 0, 255);
  }  
  if ( keyPressed && key == 'b' ) { 
    bval += e;
    bval = constrain(bval, 0, 255);
  }  
  if ( keyPressed && key == 'w' ) { 
    wval += e;
    wval = constrain(wval, 2, width/2);
  }
  println("R "+rval+" G "+gval+" B "+bval+" brushsize "+wval);
  brush = color(rval, gval, bval);
  fill(brush);
  noStroke();
}

void keyPressed() {
  if ( key == 's' ) {
    save(outfile);
    println("saved to "+outfile);
  }
}

now the console feedback is a little bit poor, so i made a
custom cursor show the brush in size and color!

// painter_basic_mousewheelplusplus 
// V0.2 with cursorimage ( brush color and size )

int rval, gval, bval;               // drawn circle fill color RGB
color brush =color(0, 0, 0, 100);
int wval=5;                         // brush size
String outfile = "data/mypic.png";
PImage mycursor;
int csize = 30;

//_______________________________________________ SETUP
void setup() {
  size(300, 300);
  println("use mouse LEFT press for paint, RIGHT press for erase");
  println("use key: \n[s] for save picture\n mousewheelplusplus: press\n[r] red\n[g] green\n[b] blue\n[w] brush size\nand turn mousewheel");
  colorMode(RGB, 100);
  fill(brush);
  noStroke();
  background(100);
  mycursor = createImage(csize, csize, ARGB);
  set_cursor();
}

//_______________________________________________ DRAW
void draw() {                  // drawing mode  background(200,200,0);
  if ( mousePressed ) {
    if      ( mouseButton == LEFT )  fill(brush);
    else if ( mouseButton == RIGHT ) fill(100);
    circle(mouseX, mouseY, wval);
  }
}

//_______________________________________________ OPERATION Mouse Wheel Plus Plus
void mouseWheel(MouseEvent event) {   // move mouse wheel
  float e = event.getCount();
  if ( keyPressed && key == 'r' )  rval += e;
  if ( keyPressed && key == 'g' )  gval += e;
  if ( keyPressed && key == 'b' )  bval += e; 
  if ( keyPressed && key == 'w' )  wval += e;
  rval = constrain(rval, 0, 100);
  gval = constrain(gval, 0, 100);
  bval = constrain(bval, 0, 100);
  wval = constrain(wval, 1, 30);
  println("R "+rval+" G "+gval+" B "+bval+" brushsize "+wval);
  brush = color(rval, gval, bval);
  fill(brush);
  noStroke();
  set_cursor();
}

void keyPressed() {
  if ( key == 's' ) {
    save(outfile);
    println("saved to "+outfile);
  }
}

void  set_cursor() {
  for ( int i = 0; i<mycursor.width; i++ ) for ( int j = 0; j<mycursor.height; j++)  mycursor.set(i, j, color(0, 0, 0, 0));  // set cursor transparent
  for ( int i = 0; i<wval; i++ ) for ( int j = 0; j<wval; j++)  mycursor.set(i, j, color(rval, gval, bval, 100));            // show brush color and size
  cursor(mycursor, 0, 0);
}

SNAG-0094
( sorry, the cursor not show in the snap )