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let leftred = false;
function setup() {
createCanvas(600, 600);
}
function draw() {
background(255);
let rectwidth=width/3;
rect(0,0,rectwidth,height);
if(mouseX<rectwidth){
leftred = !leftred;
if(leftred==true){
fill(255,0,0);
}
else{
fill(255);
}
}
else if(mouseX>=rectwidth && mouseX<rectwidth*2){
rect(rectwidth,0,rectwidth,height);
fill(255,0,0);
noStroke();
}
else if(mouseX>=rectwidth*2){
rect(rectwidth*2,0,rectwidth,height);
fill(255,0,0);
noStroke();
}
}