var jz = ["0100","1010","0101","1010"];

var s = min(width, height)/4;
var pad = 5;

var draw = function() {
    background(255, 233, 171);
    noStroke();
    for (var r = 0; r < jz.length; r++) {
        for (var c = 0; c < jz[r].length; c++) {
            var t = jz[r][c];
            if (t === '0') { fill(255,255,255,0); }
            if (t === '1') { fill(0,0,0); }
            ellipse(c*s+s*0.5, r*s+s*0.5, s-pad, s-pad);
        }
    }
};