Quick question about bpatchers

I wrote a javascript that will automatically resize and reposition the patcher living in a [bpatcher] when the patch loads which has proved useful. The code is below. If you give the object the argument 1 it will use only objects in presentation mode (make sure you select the patch to open in presentation mode too) the default behaviour is to use all objects in the patch. Here's the code, it could probably be optimised a bit, let me know if you'd like an example to demonstrate how it works.

// lh.bpresize.js

var edges;
var mode = (jsarguments[1]>0);
var obj;

function loadbang() {
    if (!max.loadbangdisabled) {
        bang();
    }
}

function bang() {
    edges = [Number.POSITIVE_INFINITY,
        Number.POSITIVE_INFINITY,
        Number.NEGATIVE_INFINITY,
        Number.NEGATIVE_INFINITY];
    this.patcher.apply(iter);
    move = [edges[0]*-1,edges[1]*-1];
    size = [edges[2]-edges[0],edges[3]-edges[1]];
    if (this.patcher.box) {
        this.patcher.box.message("offset",move);
        a = this.patcher.box.rect;
        this.patcher.box.rect = [a[0],a[1],size[0]+a[0],size[1]+a[1]];
    }
}

function iter(a) {
    obj = a;
    if (mode) {
        if (a.getattr("presentation")) {
            calc();
        }
    } else {
        calc();
    }
}

function calc() {
    if (mode) {
        attr = "presentation_rect";
    } else {
        attr = "patching_rect";
    }
    for (i=0; iedges[i]) {
            edges[i] = obj.getattr(attr)[i]+obj.getattr(attr)[i-2];
        }
    }
}

function setmode(x) {
    mode = (x>0);
}

// EOF