Function hasOverlap

docs/app/js/sanddance-app.js:120203–120207

(items, pad)

// including padding pixels of separation
const intersect = (a, b, sep)=>sep > Math.max(b.x1 - a.x2, a.x1 - b.x2, b.y1 - a.y2, a.y1 - b.y2);
const hasOverlap = (items, pad)=>{
    for(var i = 1, n = items.length, a = items[0].bounds, b; i < n; a = b, ++i){
        if (intersect(a, b = items[i].bounds, pad)) return true;
    }
};
const hasBounds = (item)=>{
    const b = item.bounds;
    return b.width() > 1 && b.height() > 1;