Illustrator JavaScript count area with offset.

[Galajas]

Hello,

It is possible to count area with 5 mm. offset?

Example:

  I use this script and want to add a 5 mm offset in the count:

alert (app.activeDocument.selection[0].area);

I want to count irregular square where shape like U form, + offset. Shape 10x10 cm size, with 5x5 cm cut. I want to get a shape area not 75 cm2 but 101cm2.

It is even possible or not? 

[CarlosCanto]

obviously you can't get 101 cm2 if you start with 10x10. So, assuming you want to find the size of a rectangle that will give you 101 after substrating a 5x5 area, try this

// pseudo code

x2 = 101 cm2 + 25 cm2 = 126 cm2

x = Math.sqrt(x2) = 11.22497 cm

[pixxxelschubser]

Only one question:

10cm ×10cm + offset 0,5cm (all sides)

=

11cm × 11cm

=

121 cm²

… or not? Am I wrong?

[CarlosCanto]

@pixxxelschubser that's what I thought at first, but I believe that by "offset" he means the 5x5 rectangle

[pixxxelschubser]

Yes. The description is still not clear for me.

And the result of 101cm² is even less clear to me.

Maybe a better screenshot with an offset-object in background an the black object in the foreground will give an enlightenment?

[Galajas]

Everything that you all say is correct.

My issue is when, I have shape 100x100 mm with 50x50 cut, and that shape area is 7500 mm2.

Everything is ok if I count with this:

app.activeDocument.pathItems[index].area

 But I need that, area script count with like compensation. Count not original area but bigger shape like that(red dash line):

And then I get that my area is 10100 mm2. I Dont want to add that new one shape just for the count area, it is possible to make with the script?

[femkeblanco]

It's possible.  But why not simply do "offset path", run your line of code and then undo.  It will take seconds.  Scripting will just emulate this.  

[Galajas]

Maybe it's possible, but I need in the same script real area and with „Offset path“, and I have countless different shapes where I mus count that area. That's why I ask it is possible to make that script, and maybe someone knows how?

[CarlosCanto · Accepted solution]

I see, you have to make the shape to be able to query its Area.

here's a script that adds the offset path, you can delete it after getting the area if you don't need it.

Select ONE shape before running

// apply offset path to selected pathItem
//https://community.adobe.com/t5/illustrator/illustrator-javascript-count-area-with-offset/td-p/11564739?page=1

function main () {
    var idoc = app.activeDocument;
    var sel = idoc.selection[0];

    app.userInteractionLevel = UserInteractionLevel.DONTDISPLAYALERTS;

    var mm = 72/25.4;
    var offset = 5*mm;
    
    // offset path Effect with Round Joins
    var xmlstringOffsetPath = '<LiveEffect name="Adobe Offset Path"><Dict data="R mlim 4 R ofst value I jntp 2 "/></LiveEffect>'; // 0 = round, 1=bevel, 2=miter
    xmlstringOffsetPath = xmlstringOffsetPath.replace("value", offset);

    idoc.selection = null;
    
    var dup = sel.duplicate(sel, ElementPlacement.PLACEAFTER);
    try {
        dup.filled = false;
    }
    catch(e) {}

    dup.selected = true; // select it before applying effects
    
    // apply offset path Effect
    dup.applyEffect(xmlstringOffsetPath);
    app.redraw();
    
    // expand appearance
    app.executeMenuCommand ('expandStyle');
    
    app.userInteractionLevel = UserInteractionLevel.DISPLAYALERTS; 
}

main();

 Carlos