Javascript for Illustrator new feature: Cap Height

[Get5E1E]

Hello,

I'm thinking about making a script that would assign the Cap Height to certain values in millimeters. I understand that there is a new feature to "Set font height preference". But is it possible?

I'm sorry if it's pretty vague, but I'm thinking of creating a dropdown list---say if I choose option "A", then the cap height will be sized to 2mm. If "B", then 3mm, and so on. This will be the purpose of the script.

Thank you and I would appreciate your feedback.

[femkeblanco]

Not what you asked for but...

var frames = app.activeDocument.textFrames;
var window1 = new Window("dialog", "Cap height");
var group1 = window1.add("group");
var button1 = group1.add("button", undefined, "↑");
var button2 = group1.add("button", undefined, "↓");
var scale = function (addend) {
  for (var i = 0; i < frames.length; i++) {
    var chars = frames[i].textRange.characters;
    for (var j = 0; j < chars.length; j++) {
      if (/[A-Z]/.test(chars[j].contents)) {
        chars[j].characterAttributes.verticalScale = chars[j].characterAttributes.verticalScale + addend;
        redraw();
      }
    }
  }
}
button1.onClick = function () {scale(10)}
button2.onClick = function () {scale(-10)}
window1.show ();

You could try calculating the addend (a percentage) from millimeters, which in turn you calculate from points, but given my ignorance of typeface anatomy I will not attempt this.