let x=15
let z=180
function setup(){
createCanvas(800,800);
background(0);
colorMode(HSB,300,100,100);
}
function draw(){
strokeWeight(x)
stroke(z,80,80);
if(mouseIsPressed){
line(mouseX,mouseY,pmouseX,pmouseY)}
if(keyIsPressed){
if(key=='q'||key=='Q')
z-=1
if(key=='w'||key=='W')
z+=1
}
if(keyIsPressed){
if(key=='A'||(key=='a'))
x-=0.1
if(key=='d'||(key=='D'))
x+=0.1
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>