Function collideRects

docs/app/js/sanddance-app.js:140966–140968

(a, b)

    if (d.y + d.y1 > b1.y) b1.y = d.y + d.y1;
}
function collideRects(a, b) {
    return a.x + a.x1 > b[0].x && a.x + a.x0 < b[1].x && a.y + a.y1 > b[0].y && a.y + a.y0 < b[1].y;
}
function archimedeanSpiral(size) {
    var e = size[0] / size[1];
    return function(t) {