Illustrator Scale Strokes Script

// script.name = scaleStrokes.jsx;
// script.description = scales selected objects strokes only;
// script.required = one or more selected objects
// script.parent = CarlosCanto // 5/7/12;
// script.elegant = false;

// script.updates = preview ON by default // 5/7/12

#target Illustrator

var idoc = activeDocument;
var sel = idoc.selection;
var unscale = 0;
if (sel.length>0) {
    var win = new Window("dialog", "Scale Strokes");
    var pnlScale = win.add("panel");
    pnlScale.orientation = "row";
    var lblScale = pnlScale.add("statictext",undefined,"Scale");
    var editScale = pnlScale.add("edittext",undefined,"100");
    editScale.characters = 5;
    var lblScale = pnlScale.add("statictext",undefined,"%");

    var grpScroll = win.add("group");
    var scrlScale = grpScroll.add("scrollbar", undefined,100, 1, 1000); // 1 min scaling to avoid division by zero

    var grpBottom = win.add("group");
    grpBottom.alignChildren = "top";
    var chkpreview = grpBottom.add("checkbox", undefined, "Preview");
    chkpreview.value = 1;
    var grpButtons = grpBottom.add("group");
    grpButtons.orientation = "column";
    var btnOk = grpButtons.add("button", undefined, "Ok");
    var btnCancel = grpButtons.add("button", undefined, "Cancel");

    win.helpTip = grpBottom.helpTip = "\u00A9 2012 Carlos Canto";

    scrlScale.onChanging = function() {
        editScale.text = this.value; // update edit box with scroll value
        scaleStrokes (sel,editScale.text); // and do the scaling as the scroll changes
    }

    editScale.onChange = function() {
        if (this.text<1) // if value entered by hand is less than 1, make it 1 to avoid division by zero
            this.text = 1;
        scrlScale.value = this.text; // update edit box with scroll value
        scaleStrokes (sel,editScale.text); // and do the scaling after the edit box changes (manually entering values)
    }

    chkpreview.onClick = function () {
        if (chkpreview.value)
            app.redraw();
    }

    // unscale (back to 100%) on cancel, except no scaling has applied
    btnCancel.onClick = function() {
        if (unscale != 0) {
            unscaleStrokes (sel, unscale);
        }
        win.close();
    }

    win.center();
    win.show();
}
else {
    alert("select at least one object before running");
}

function scaleStrokes (sel,scale) {
    // skip unscaling the first time, there's nothing to unscale
    if (unscale != 0) {
        unscaleStrokes (sel, unscale);
    }
    for (i=0; i<sel.length; i++) {
        var pgitem = sel[i];
        pgitem.resize(100, 100, undefined, undefined, undefined, undefined, scale, Transformation.CENTER);
    }
    if (chkpreview.value)
        app.redraw();
    unscale = 10000/scale;
}

// unscale or bring back selection to 100%
function unscaleStrokes (sel,unscale) {
    for (j=0; j<sel.length; j++) {
        var pgitem = sel[j];
        pgitem.resize(100, 100, undefined, undefined, undefined, undefined, unscale, Transformation.CENTER);
    }
    if (chkpreview.value)
        app.redraw();
}