Adobe Illustrator script to resize objects proportionally to fit inside the artboard.

AiFitToArtboard.jsx

/*

--------------------------------------------------
 NOTE: this is not maintained, and I haven't
 tried it in a long time - but may work as a base
 to modify for your needs i.e. ymmv
--------------------------------------------------



Illustrator CS4+ script for resizing objects
proportionally so that they fit inside artboard

Based on: https://forums.adobe.com/message/4164590

Usage:
1. Create new document with desired artboard size
2. Paste object into document, select it and run this script

Bugs:
Centering does not work after changing artboard size

Future versions:
- Scale original object, don't duplicate

*/

var activeDoc = app.activeDocument
var selection = activeDoc.selection

// check if anything is selected
if (selection.length > 0) {
  for (var i = 0; i < selection.length; i++) {
    var item = selection[i].duplicate()

    var abActive =
      activeDoc.artboards[activeDoc.artboards.getActiveArtboardIndex()]

    var abProps = getArtboardBounds(abActive)
    var boundsDiff = itemBoundsDiff(selection[i])

    fitItem(item, abProps, boundsDiff) // scale object to fit artboard
  }
} else {
  alert('Select an object before running this script')
}

function getArtboardBounds(artboard) {
  var bounds = artboard.artboardRect

  var left = bounds[0]
  var top = bounds[1]
  var right = bounds[2]
  var bottom = bounds[3]

  var width = right - left
  var height = top - bottom

  var props = { left: left, top: top, width: width, height: height }

  return props
}

function itemBoundsDiff(item) {
  var itemVB = item.visibleBounds

  var itemVW = itemVB[2] - itemVB[0] // right - left
  var itemVH = itemVB[1] - itemVB[3] // top - bottom

  var itemGB = item.geometricBounds

  var itemGW = itemGB[2] - itemGB[0] // right - left
  var itemGH = itemGB[1] - itemGB[3] // top - bottom

  var deltaX = itemVW - itemGW
  var deltaY = itemVH - itemGH

  var diff = { deltaX: deltaX, deltaY: deltaY }

  return diff
}

function fitItem(item, props, diff) {
  var oldWidth = item.width
  var oldHeight = item.height

  if (item.width > item.height) {
    // landscape, scale height using ratio from width
    item.width = props.width - diff.deltaX
    var ratioW = item.width / oldWidth
    item.height = oldHeight * ratioW
  } else {
    // portrait, scale width using ratio from height
    item.height = props.height - diff.deltaY
    var ratioH = item.height / oldHeight
    item.width = oldWidth * ratioH
  }

  // center
  item.top = 0 - (props.height / 2 - item.height / 2)
  item.left = props.width / 2 - item.width / 2

  // deselect
  item.selected = false
}

Is this different than using the command "Fit Artwork to Bounds"?

Sorry for not replying sooner Chris, I only saw this today.

This script does the reverse of what "Fit to Artwork Bounds" does - instead of changing the artboard, it scales the selected object proportionally to fit perfectly inside of it instead.

It's useful for resizing objects with wildly disparate dimensions to fit a specific size:

Thanks for making this, initially I thought it doesn't work, but then noticed that your script moves the copied artwork somewhere in my first artboard, which I don't have selected and therefore am not focused on it.

Same here, selected the object - fits perfect the size but not in the middle of the artboard. Any trick to solve this? Very nice script because we really need it to make paint-decals for a new game.
Thank you for the script!

Very useful, thanks! Btw., the fact that it's not working in CS3 isn't it simply due to the .jsx extension? Somewhere I saw recommendation to change the extension from .jsx to .js fo CS, but I haven't tried that yet, as I use later version.

Hi Ruandre. Thanks for doing this. There seems to be a bug in CC2016, though. It scales the artwork just fine, but it doesn't erase the original art, so you end up with both the original and scaled images all mixed up with each other.

@aholub just this at the end:

var docSelected = app.activeDocument.selection; for (j=0; j<docSelected.length; j++) docSelected[j].remove();

Check this out:
https://gist.github.com/shivendra14/5147b529001da1458a0017c866f633b9

modified this to scale artwork and artboard :)

and this one to scale up assets:
https://gist.github.com/shivendra14/f135d6279a20053a62a798be5da5e174

Hi Your script works great but i need to scale the object with scale & stroke effects on. Is it possible, please help me