JSFL Script to turn PNG Sequence into Reflected SWF animation

gistfile1.txt

/**
 *  @language    	JSFL
 *
 *	@author         JP DeVries
 *	@since          24.08.11
 *  @version        0.1
 *	
 *	@description 
 * This is a jsfl script that will take all png files from a source folder and create a swf of the sequence playing forwards, then backwards
 * The file that is currently open and has focus in the IDE is used as the host for exporting.
 * Stage size and publish settings from the host fla are used when exporting.	 			
 *	
 */

// Set up variables
var doc = fl.getDocumentDOM();
var timeline = doc.getTimeline();
var i;
var saveName;

// Get a source directory
var srcDir = fl.browseForFolderURL("Choose a folder to import PNGs from:");

// Get a save directory.
var saveDir = fl.browseForFolderURL("Choose a folder in which to save your exported SWF:");

if (saveDir && srcDir) {
	
	// Get the Flash document's name, and strip off the final ".fla", 
	fl.outputPanel.clear();
	
	// Build a base name for the exported files.
	saveName = saveDir + "/";
	
	// Grab all png files in the source folder
	var fileMask = "*.png";
	var fileList = FLfile.listFolder(srcDir + "/" + fileMask, "files");
	fileList = reflectFileList(fileList);
	
	timeline.currentFrame = 1;
	timeline.clearFrames(0);
	// Now process through each one and export it as a swf
	for (var i=0; i < fileList.length; i++) {
		// Import the file
		var URI = srcDir + "/" + fileList[i];
		
		// make room
		timeline.currentFrame = i+1;
		if(i>0) timeline.insertBlankKeyframe();

		// if it's already in the library reuse it, otherwise add it fresh
		var _itemExists = doc.library.itemExists(fileList[i]);
		if(!_itemExists)doc.importFile(URI);
		else doc.library.addItemToDocument({x:document.width/2, y:document.height/2}, fileList[i]);
		
		// Export the file
		var fileName = fileList[i].substr(0,fileList[i].length -4);
		

	};
	
	// export the swf
	var _fs = saveDir.split('/');
	exportSwf(_fs[_fs.length-1]);
	
	// clear the timeline
	//doc.getTimeline().clearFrames(0);
}

// creates an auto rewind sequence by reflecting the file list
// ex: 12321 for files 123
function reflectFileList(fileList) {
	var _ra = new Array();
	
	for(var i = 0; i < fileList.length; i++) _ra.push(fileList[i]);
	for (var i = fileList.length-2; i >= 0; i--) _ra.push(fileList[i]);
	
	return _ra;
}

// save out the swf
function exportSwf(fileName) {
	var _name = saveName + fileName + ".swf";
	doc.exportSWF(_name, true);
	// Log the file in case you need to refer to it
	fl.trace("Exported: " + _name);
}