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HTML

              
                
              
            
!

CSS

              
                body {
	margin: 0;
	overflow: hidden;
	background-color: white;
}

/* on positionne le canvas p5 dans la page*/
canvas {
	position: fixed;
	left: 0;
	right: 0;
	top: 100px;
	margin: auto;
	background-color: #23033C;
}
              
            
!

JS

              
                var a = 0;

function setup() {
	createCanvas (500,500);
}

function draw() {
	//noStroke();
	strokeWeight(a);
	stroke('#FFE037');
	fill('#FFE037');
	//ellipse(mouseX, mouseY, a, a);
	line(mouseX, mouseY, pmouseX, pmouseY);
}

//à chaque déplacement de la souris le cercle grossit
function mouseMoved() {
  a = a + 1;
}



//quand on clique cela réinitialise la taille du cercle et efface le trait
function mousePressed() {
  clear();
	a = 0;
}

//quand on appuie sur une touche du clavier on fait une capture du canvas et l'image se télécharge
function keyTyped () {
	saveCanvas("01.jpg");
}

              
            
!
999px

Console