Paint

void setup(){
  size(800,600);
}

void draw(){
 rect(10,50,70,30);
 rect(100,50,70,30);
 rect(200,50,70,30);
 rect(300,50,70,30);
 rect(400,50,70,30);
 rect(500,50,70,30);
 rect(600,50,70,30);
 rect(700,50,70,30);


 if(mouseX>100 && mouseX<170 && mouseY>50 &&  mouseY<80 && mousePressed){
  strokeWeight(1);
 }

 if(mouseX>200 && mouseX<270 && mouseY>50 &&  mouseY<80 && mousePressed){
   strokeWeight(10);
 }

 if(mouseX>300 && mouseX<370 && mouseY>50 &&  mouseY<80 && mousePressed){
   strokeWeight(25);
 }

 if(mouseX>400 && mouseX<470 && mouseY>50 &&  mouseY<80 && mousePressed){
   stroke(0,255,0);
 }

 if(mouseX>500 && mouseX<570 && mouseY>50 &&  mouseY<80 && mousePressed){
   stroke(0,0,255);
 }

 if(mouseX>600 && mouseX<670 && mouseY>50 &&  mouseY<80 && mousePressed){
  stroke(255,0,0);
 }

 if(mouseX>700 && mouseX<770 && mouseY>50 &&  mouseY<80 && mousePressed){
  background(255);
 }

 if(mousePressed){
   line(mouseX,mouseY,pmouseX,pmouseY);
 }

 if(mouseX>10 && mouseX<170 && mouseY>50 &&  mouseY<80 && mousePressed){
  saveFrame("picture.png");
 }
}