•  Small javascript that gives back the scale and the rotate of a selected "placed img"

Hi @dimitri_cas, I will use the same structure I showed you on your other question, but this time I've incorporated your function. Give it a try. Note that if you are new to scripting, using BridgeTalk is not an easy thing to do.

- Mark

/**
 * @file Illustrator ScriptUI BridgeTalk Palette Demo.js
 *
 * Just shows a simple example of using BridgeTalk to
 * communicate between a palette window and Ilustrator.
 *
 * @author m1b and @dimitri_cas
 * https://community.adobe.com/t5/illustrator-discussions/small-javascript-that-gives-back-the-scale-and-the-rotate-of-a-selected-quot-placed-img-quot/m-p/14871091#M420851
 */
(function () {

    // check if the window already exists by using a global variable
    if (
        "undefined" !== typeof $.global.myPalette
        && null !== $.global.myPalette
    ) {
        // NOTE: while debugging, you will want to disable this part
        // because it will stop your new palette from instantiating
        // (otherwise you'll need to restart Illustrator each time!)
        $.global.myPalette.active = true;
        $.global.myPalette.show();
        return;
    }

    // create a new ScriptUI palette (modeless window)
    $.global.myPalette = new Window("palette", "Text Setter", undefined, { resizeable: false });

    // simple UI for the demo: a text field and button
    var scaleXGroup = myPalette.add('group {orientation: "row", preferredSize:[300,-1]}'),
        scaleXlabel = scaleXGroup.add("statictext {text:'Scale X:', alignment:['left','center'] }"),
        scaleXField = scaleXGroup.add("edittext {text:'100', alignment:['left','center'], characters:10}"),
        scaleYlabel = scaleXGroup.add("statictext {text:'Scale Y:', alignment:['left','center'] }"),
        scaleYField = scaleXGroup.add("edittext {text:'100', alignment:['left','center'], characters:10}"),
        rotationField = scaleXGroup.add("edittext {text:'0', alignment:['left','center'], characters:10}"),
        udpateButton = myPalette.add("button", undefined, "Update");

    // do the BT call when the button is clicked
    udpateButton.onClick = function () {

        // a BridgeTalk message
        var bt = new BridgeTalk();
        bt.target = "illustrator";

        // convert the function to a string using toSource and invoke it, passing the textInput text
        bt.body = "(" + getScaleAndRotation.toSource() + ")();";

        // handle the result returned from Illustrator
        bt.onResult = function (response) {

            var values = response.body.split(',');

            var rounded = [
                roundStringToTwoPlaces(values[0]),
                roundStringToTwoPlaces(values[1]),
                roundStringToTwoPlaces(values[2]),
            ];

            if (undefined != rounded[0])
                scaleXField.text = rounded[0];
            if (undefined != rounded[1])
                scaleYField.text = rounded[1];
            if (undefined != rounded[2])
                rotationField.text = rounded[2];

        };

        // send the script to Illustrator
        bt.send();

    };

    // Show the palette
    myPalette.center();
    myPalette.show();

    // helper to format a number string from response
    function roundStringToTwoPlaces(n) {
        if (!isNaN(n))
            return String(Math.round(Number(n) * 100) / 100);
    };

    // function to be sent to Illustrator via BridgeTalk
    function getScaleAndRotation() {

        /*
            IMPORTANT: you must use block comments in any function
            that you will be sending via BridgeTalk, because it seems
            to evaluate the whole body as a single line, therefore
            an inline comment will nullify everything after it.
        */

        var selectedItem = app.activeDocument.selection[0];

        /* Check if something is selected */
        if (undefined == selectedItem) {
            alert("Please select an object.");
            return;
        }

        /* Check if it's a linked image (PlacedItem) or a raster image (RasterItem) */
        if (selectedItem.typename !== "PlacedItem" && selectedItem.typename !== "RasterItem") {
            alert("The selected object is not a linked or raster image.");
            return;
        }

        /* Get the transformation matrix of the selected object */
        var matrix = selectedItem.matrix;

        /* Calculate the scaling based on the transformation matrix */
        var scaleX = Math.sqrt(matrix.mValueA * matrix.mValueA + matrix.mValueB * matrix.mValueB) * 100;
        var scaleY = Math.sqrt(matrix.mValueC * matrix.mValueC + matrix.mValueD * matrix.mValueD) * 100;

        /* Calculate the rotation in degrees */
        var rotation = -Math.atan2(matrix.mValueB, matrix.mValueA) * (180 / Math.PI);

        return [scaleX, scaleY, rotation].join(',');

    };

})();

Bonjour,

// PALETTE
// =======
var myPalette = new Window('dialog', 'DC TOOLS');  // , {resizeable: true}
    // myPalette.text = "DC TOOLS";
    myPalette.orientation = "column";
    myPalette.alignment = "center"; // Center the text horizontally
    myPalette.alignChildren = ["center","top"];
    myPalette.spacing = 1;
    myPalette.margins = 2;


var button10 = myPalette.add("button", undefined, undefined, {name: "button10"});
    button10.text    = "IMG Scale";
    button10.alignment = ["center","top"];
    button10.onClick = function () {
      showScaleAndRotation();
      myPalette.close();
    }

    myPalette.center();
//myPalette.frameLocation = [ myPalette_XPOS, myPalette_YPOS ];
    myPalette.show();