How to make an image smaller while leaving the it in it's original proportions?

Question

I'm trying to add a list of images from my Google drive to a Google doc using Google apps script. I made a list named images_list of links to the images that are in my Drive. I was able to add all the content I need to the doc and the images at the end of it.

Currently the images are huge in their size, and I turned it into 400X400. The problem is that not all them are square.

How can I make the image smaller while leaving the image in it's original proportions?

This is the code I'm using:

  if(images_list[0]){
    for(var i=0; i<images_list.length; i++){
      try{
        var imageID = images_list[i].slice(32,65);
        var blob = DriveApp.getFileById(imageID).getBlob();
        var imgDoc = body.appendImage(blob);
        imgDoc.setWidth(400).setHeight(400)
        bullet_index = bullet_index+1
      }catch(e){}
    }
  }

Thanks!

Answer 1

For example it could be something like this:

if (images_list[0]) {
  for (var i = 0; i < images_list.length; i++) {
    try {
      var imageID = images_list[i].slice(32, 65);
      var blob = DriveApp.getFileById(imageID).getBlob();

      var max = 400;
      var w = imgDoc.getWidth();
      var h = imgDoc.getHeight();
      if (w > h) { h = h * (max / w); w = max }
      else { w = w * (max / h); h = max }

      imgDoc.setWidth(w).setHeight(h);

      bullet_index = bullet_index + 1
    } catch (e) { }
  }
}

It will fit any image into a square 400x400 px while keeping the aspect ratio.