omg thanks a lot this really helped me with what i wanted to do thanks a million andreas

hey andreas i currently have a drawing app and i implemented your codes in to fit in with my codes and basically im trying to switch colors when i click them.....these are my codes right now

// Color
color BG = color(32);
color Red = color(255,13,13);
color Blue = color(24,22,240);
color Green = color(51,229,52);
color Purple = color(116,41,240);
color Yellow = color(255,244,31);
color Orange = color(255,157,52);
color Brown = color(131,114,70);
color White = color(255);
color Grey = color(175);
color Black = color(0);

//Switching between modes
 static final int NONE = 0;
 static final int RECTANGLE = 1;
 static final int CIRCLE = 2;
 static final int TRIANGLE = 3;

//Store current mode
 int myDrawMode = NONE;

void setup(){
  size(500,500); 
  background(BG);
  smooth();

}

void draw(){
 
  //Draw background of toolbar
  fill(255);
  strokeWeight(1);
  rect (-1, -1, 125, 250);
 
  //Brush Sizes
  fill(255);
  strokeWeight(1);
  rect (-1, 249, 125, 251);
 
  //Draw color selections
  stroke(0);
  strokeWeight(2);
  fill(Red);
  ellipse (20, 20, 25, 25);
  fill(Blue);
  ellipse (60, 20, 25, 25);
  fill(Green);
  ellipse (100, 20, 25, 25);
  fill(Purple);
  ellipse (20, 60, 25, 25);
  fill(Yellow);
  ellipse (60, 60, 25, 25);
  fill(Orange);
  ellipse (100, 60, 25, 25);
  fill(Brown);
  ellipse (20, 100, 25, 25);
  fill (White);
  ellipse (60, 100, 25, 25);
  fill (Grey);
  ellipse (100, 100, 25, 25);
  fill (Black);
  ellipse (20, 140, 25, 25);
 
  //Draw line thickness selections
  fill (0);
  ellipse (60, 295, 5, 5);
  ellipse (60, 325, 10, 10);
  ellipse (60, 360, 15, 15);
  ellipse (60, 400, 25, 25);
  ellipse (60, 450, 35, 35);
 
  //Different Modes
 if(mousePressed) {
     switch(myDrawMode) {
       case(RECTANGLE):
       fill(255,128);
       rect(mouseX, mouseY, 20,20);
       break;
       case(CIRCLE):
       fill(255,128);
       ellipse(mouseX, mouseY, 20,20);
       break;
       case(TRIANGLE):
       fill(255,128);
       triangle(mouseX-10, mouseY+10, mouseX, mouseY-10,mouseX+10, mouseY+10);
       break;
     }
   }
 }

 void keyPressed() {
   // check which key was pressed and set the
   // draw mode accordingly.
   switch(key) {
     case('0'): myDrawMode = NONE; break;
     case('1'): myDrawMode = RECTANGLE; break;
     case('2'): myDrawMode = CIRCLE; break;
     case('3'): myDrawMode = TRIANGLE; break;
     case('4'): background(BG); break;
   }
 
}