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var lines = [];
function setup() {
createCanvas(400, 400);
background(100);
}
function draw() {
if(mouseX<400 && mouseY<400){
let b = new Line(mouseX,0,mouseX,400);
lines.push(b);
}
for(i=0; i<lines.length; i++){
lines[i].display();
}
}
function Line(x,a,y,b){
this.x=mouseX;
this.a=0;
this.y=mouseX;
this.b=400;
this.display = function(){
stroke(220);
line(this.x,this.a,this.y,this.b);
}
}