valpha = 0;

arcSize =200

​

function setup() {

  createCanvas(600, 600);

}

​

function draw() {

  background('white');

    mouseX = constrain(mouseX, 10, width);

    mouseY = constrain(mouseY, 10, height);

    yStep = mouseY;

    arcSize = mouseX;

    noFill();

    for (y=0; y<height; y+=yStep) {

        sw = map(sin(radians(y + valpha)), -1, 1, 2, yStep);

        strokeWeight(sw);

        for (x=0; x<width+arcSize; x+=arcSize) {

            arc(x, y, arcSize / 2, arcSize / 2, 0, PI);

            arc(x + arcSize / 2, y, arcSize / 2, arcSize / 2, PI, TWO_PI);

        }

    }

    valpha++;

}