Function intersectPath

docs/app/js/sanddance-app.js:122186–122200

(draw1)

var context = (context = (0, _vegaCanvas.canvas)(1, 1)) ? context.getContext("2d") : null;
const b = new Bounds();
function intersectPath(draw1) {
    return function(item, brush) {
        // rely on (inaccurate) bounds intersection if no context
        if (!context) return true; // add path to offscreen graphics context
        draw1(context, item); // get bounds intersection region
        b.clear().union(item.bounds).intersect(brush).round();
        const { x1 , y1 , x2 , y2  } = b; // iterate over intersection region
        // perform fine grained inclusion test
        for(let y21 = y1; y21 <= y2; ++y21)for(let x22 = x1; x22 <= x2; ++x22){
            if (context.isPointInPath(x22, y21)) return true;
        }
         // false if no hits in intersection region
        return false;
    };
}
function intersectPoint(item, box) {
    return box.contains(item.x || 0, item.y || 0);
}