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Here is a more complicated (and useful 
) example. (--Its actual usefulness is not as, erm, useful as I hoped, because it seems you don't have access to the built-in stroke styles! If anyone knows a work-around that, let me know ...)
First, create a few custom Striped and/or Dashed stroke styles; then call this Javascript to see them created "live" in the drop down. Make sure you removed the sample code from the end of "pnglib.jsx", otherwise that dialog with interfere and mess up my nice program.
#include "pnglib.jsx"
function createStripeImg (styleIndex)
{
var pngPal = "\x00\x00\x00"+"\xff\xff\xff";
var pngData = '';
var x,y, ystart;
var stripes = [];
var i;
for (y=0; y<app.activeDocument.stripedStrokeStyles[styleIndex].stripeArray.length; y++)
stripes.push (Math.round (11*app.activeDocument.stripedStrokeStyles[styleIndex].stripeArray
/100)); i = 0;
for (y=0; y<11; y++)
{
if (y >= stripes)
{
if (y <= stripes[i+1])
{
for (x=0; x<48; x++)
pngData += "\x00";
continue;
}
i += 2;
}
for (x=0; x<48; x++)
pngData += "\x01";
}
return makePng (48,11, pngPal, pngData, "\xff\x00");
}
function createDashImg (styleIndex)
{
var pngPal = "\x00\x00\x00"+"\xff\xff\xff";
var pngData = '';
var x,y, xstart;
var dashes = [];
var i, len;
len = 0;
for (y=0; y<app.activeDocument.dashedStrokeStyles[styleIndex].dashArray.length; y++)
len += app.activeDocument.dashedStrokeStyles[styleIndex].dashArray
; xstart = 0;
for (y=0; y<app.activeDocument.dashedStrokeStyles[styleIndex].dashArray.length; y++)
{
dashes.push (xstart);
xstart += Math.round (48*app.activeDocument.dashedStrokeStyles[styleIndex].dashArray
/len); }
dashes.push (47);
i = 0;
for (y=0; y<11; y++)
{
if (y < 3 || y > 8)
{
for (x=0; x<48; x++)
pngData += "\x01";
} else
{
xstart = 0;
for (x=0; x<48; x++)
{
if (x >= dashes[xstart])
{
if (x >= dashes[xstart+1])
xstart += 2;
pngData += "\x00";
} else
{
pngData += "\x01";
}
}
}
}
return makePng (48,11, pngPal, pngData, "\xff\x00");
}
if (app.activeDocument.stripedStrokeStyles.length+app.activeDocument.dashedStrokeStyles.length < 1)
{
alert ("This example needs a few custom stripe or dash stroke styles to play with");
exit (0);
}
var w = new Window("dialog", "Select a stripe type");
var ddl = w.add("dropdownlist");
for( i=0; i < app.activeDocument.stripedStrokeStyles.length; i++)
(ddl.add('item', " "+app.activeDocument.stripedStrokeStyles.name)).image = createStripeImg (i);
for( i=0; i < app.activeDocument.dashedStrokeStyles.length; i++)
(ddl.add('item', " "+app.activeDocument.dashedStrokeStyles.name)).image = createDashImg (i);
ddl.selection = 0;
g = w.add ("group");
g.orientation = 'row';
g.add ("button", undefined, "OK");
g.add ("button", undefined, "Cancel");
w.show();
lf.corullon wrote
My God. You guys are amazing!!!
Still no way to access the built-in stroke types?
Hi,
what do you mean by "there is no way to access the built-in stroke types" ?
You can access them by using their appropriate strings as value.
Here some sample code:
var newDoc = app.documents.add();
var newRectangle = newDoc.rectangles.add
(
{
geometricBounds : [ 0, 0 , "50 mm" , "50 mm" ] ,
strokeWeight : "3 mm",
strokeColor : "Black" ,
strokeTint : -1 ,
strokeAlignment : StrokeAlignment.OUTSIDE_ALIGNMENT ,
strokeType :"$ID/Solid"
}
);
Now set the string for strokeType differently.
I gathered some with their locale independent names.
German name > locale independent name
// StrokeType
/*
Strings:
"$ID/Canned Dotted" => German "Gepunktet"
Durchgezogen $ID/Solid
Breit - Breit $ID/ThickThick
Breit - Schmal $ID/ThickThin
Breit - Schmal - Breit $ID/ThickThinThick
Schmal - Breit $ID/ThinThick
Schmal - Breit - Schmal $ID/ThinThickThin
Schmal - Schmal $ID/ThinThin
Dreifach $ID/Triple_Stroke
Weiße Rauten $ID/White Diamond
Japanische Punkte $ID/Japanese Dots
Gestrichelt (3 und 2) $ID/Canned Dashed 3x2
Gestrichelt (4 und 4) $ID/Canned Dashed 4x4
Schraffiert (nach links geneigt) $ID/Left Slant Hash
Schraffiert (gerade) $ID/Straight Hash
Gepunktet $ID/Canned Dotted
Gestrichelt $ID/Dashed
Wellenlinie $ID/Wavy
Schraffiert (nach rechts geneigt) $ID/Right Slant Hash
*/
So used like that:
var newDoc = app.documents.add();
var newRectangle = newDoc.rectangles.add
(
{
geometricBounds : [ 0, 0 , "50 mm" , "50 mm" ] ,
strokeWeight : "3 mm",
strokeColor : "Black" ,
strokeTint : -1 ,
strokeAlignment : StrokeAlignment.OUTSIDE_ALIGNMENT ,
strokeType :"$ID/Canned Dashed 3x2"
}
);
The result is this:
Regards,
Uwe
Here's the link to the other ones
https://indesignsecrets.com/easter-egg-stroke-styles.php
Woof, Happy, Feet, Lights and Rasta
Not too commonly used.
Great, Uwe!
var myTypes = ["$ID/Solid" , "$ID/ThickThick" , "$ID/ThickThin" , "$ID/ThickThinThick" , "$ID/ThinThick" , "$ID/ThinThickThin" , "$ID/ThinThin" , "$ID/Triple_Stroke" , "$ID/White Diamond" , "$ID/Japanese Dots" , "$ID/Canned Dashed 3x2" , "$ID/Canned Dashed 4x4" , "$ID/Left Slant Hash" , "$ID/Straight Hash" , "$ID/Canned Dotted" , "$ID/Dashed" , "$ID/Wavy" , "$ID/Right Slant Hash"];
var newDoc = app.documents.add();
var myPoint = 5.767;
for (var i=0; i<myTypes.length; i++)
{
var newRectangle = newDoc.graphicLines.add
(
{
geometricBounds : [ myPoint+4.233, 0 , myPoint+4.233 , "50 mm" ] ,
strokeWeight : "3 mm",
strokeColor : "Black" ,
strokeTint : -1 ,
strokeAlignment : StrokeAlignment.OUTSIDE_ALIGNMENT ,
strokeType : myTypes,
}
);
myPoint = myPoint+4.233;
}
Now it's easier!
Thank you all!!!
Update.
The PNGs created with this script display okay in InDesign itself, and in OS X's Preview and Windows' Image Viewer. However, pngcheck sometimes fails, and Photoshop cannot read the image in that case either.
... 2 hours later, I found out why. My mistake! Replace the function adler32 inside the main makepng function with this one:
var adler32 = function (/*string*/buf)
{
var i, a = 1, b = 0;
for (i=0; i<buf.length; i++)
{
a += buf.charCodeAt(i); a %= 65521;
b += a; b %= 65521;
}
return (b<<16)+a;
}
-- the error was in the first mod 65521 line, I did that on a wrong variable.
.. Fortunately, no-one noticed this so far 
[Edit] Oh, and it transpires the main packing routine needs to check for image data > 64K (an individual data block may not be larger than the 16 bits needed for each deflate block).
As Bender once said, "I've always wondered what it would be like to be more annoying." -- now you can try that too!
Introducing "Annoying Addy", based on Microsoft's iconic Clippy:
Download http://www.jongware.com/binaries/annoyingAddy.zip and have some fun 
Of course the 'buttons' and 'checkboxes' don't really work, it's just an image (but maybe Marc Autret or Peter Kahrel can make them "real").
On a slightly related note, the makepng function in this script is fixed to be able to create PNGs larger than 64K.
I am just speechless ! Great work Jongware
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