Geometric test functions

Testing whether a selected path intersects() a selected path:

var intersects = function() {
    if (app.selection.length == 1) {
        return false;
    }
    app.executeMenuCommand("group");
    app.executeMenuCommand("Live Pathfinder Intersect");
    app.executeMenuCommand("expandStyle");
    app.executeMenuCommand("ungroup");
    var a = app.selection.length;
    app.redraw();
    app.undo();
    return a == 1;
}
alert( intersects() );

Testing whether a selected path contains() a selected path:

var contains = function() {
    app.executeMenuCommand("group");
    app.executeMenuCommand("Live Pathfinder Subtract");
    app.executeMenuCommand("expandStyle");
    app.executeMenuCommand("ungroup");
    var a = app.selection[0].typename;
    var b = app.selection.length;
    app.redraw();
    app.undo();
    return a == "CompoundPathItem" || b == 2;
    // if a front path totally eclipsing a back path shouldn't count as contains()
    // then remove the b == 2 part of the expression
}
alert( contains() );

Whether a path contains() a point can be tested by first converting the point to a path with the same coordinates:

var convertPointToPath = function (x, y) {
    var path1 = app.activeDocument.pathItems.add();
    path1.setEntirePath([ [x, y], [x, y] ]);
    return path1;
}
// e.g.
var w = app.activeDocument.width;
var h = - app.activeDocument.height;
var tempPoint = convertPointToPath(w/2, h/2);

1. Feedback is appreciated.
2. Is there any way to do away with redraw()?  Presently, without redraw(), undo() undos the script and a step before. 

Thanks in advance.