SOURCE

let x=10
let h=180
function setup(){
createCanvas(500,500);
background(0);
colorMode(HSB,360,100,100);
} 
function draw(){
strokeWeight(x)
stroke(h,80,80);
if(mouseIsPressed){
line(mouseX,mouseY,pmouseX,pmouseY)}
if(keyIsPressed){
if(key=='Q')
h-=1
if(key=='W')
h+=1
}
if(keyIsPressed){
if(key=='A')
x-=0.1
if(key=='S')
x+=0.1
}
}