// After Effects script - import mask from text file
// By Vincent Rubinetti
// 08 -  16 - 2009

var pointSeparator = "\n";
var xySeparator = " ";

var project = app.project;

if (project)
{
	var myComp = app.project.activeItem;
     if (myComp != null && (myComp instanceof CompItem))
	{
         var selectedLayers = myComp.selectedLayers;
         if (selectedLayers.length == 1)
         {         
			alert("Select a text file with data points");
			var myFile = File.openDialog ("Select text file with data points");  
			var fileOK = myFile.open("r","TEXT","????");
			if (fileOK)
			{
				var undoStr = "Import Mask";
				app.beginUndoGroup(undoStr);
				
				var myLayer = selectedLayers[0];
				newMask = myLayer.Masks.addProperty("Mask");
				myMaskShape = newMask.property("Mask Path");
				myShape = myMaskShape.value;
					
				var myText = myFile.read();
				var points = myText.split(pointSeparator);
					
				var xyArray = new Array();
				var vertexArray = new Array();
				
				var xmin, ymin, xmax, ymax;
				for(var i = 0; i < points.length; i++)
				{
					xyArray = points[i].split(xySeparator);
					if (xyArray.length == 2 && !isNaN(parseFloat(xyArray[0])) && !isNaN(parseFloat(xyArray[1])))
					{
						xyArray[0] = parseFloat(xyArray[0]);
						xyArray[1] = parseFloat(xyArray[1]);
						if (i == 0)
						{
							xmin = xyArray[0];
							ymin = xyArray[1];
							xmax = xyArray[0];
							ymax = xyArray[1];
						}
						else
						{
							if (xyArray[0] > xmax)
							{xmax = xyArray[0];}
							if (xyArray[0] < xmin)
							{xmin = xyArray[0];}
							if (xyArray[1] > ymax)
							{ymax = xyArray[1];}
							if (xyArray[1] < ymin)
							{ymin = xyArray[1];}
						}
						vertexArray[i] = xyArray;
					}
					else
					{break;}
				}
			
				var xoffset = (xmin+xmax)/2;
				var yoffset = (ymin+ymax)/2;
				for (i = 0; i < vertexArray.length; i++)
				{
					vertexArray[i][0] += xoffset;
					vertexArray[i][1] += yoffset;
				}	
			
				
				var askScale, xscale, yscale;
				if (confirm("Maintain aspect ratio?"))
				{
					askScale = parseFloat(prompt("Scale factor (1 for original size, 2 for twice original size, etc; -1 to fit comp size):", 1));
					if (askScale < 0)
					{
						xscale = myComp.width/(xmax-xmin);
						yscale = myComp.height/(ymax-ymin);
						if (xscale < yscale)
						{yscale = xscale;}
						else
						{xscale = yscale;}
					}
					else
					{
						xscale = askScale;
						yscale = askScale;
					}
				}
				else
				{
					askScale = parseFloat(prompt("X scale factor (1 for original size, 2 for twice original size, etc; -1 to fit comp size):", 1));
					if (askScale < 0)
					{xscale = myComp.width/(xmax-xmin);}
					else
					{xscale = askScale;}
					askScale = parseFloat(prompt("Y scale factor (1 for original size, 2 for twice original size, etc; -1 to fit comp size):", 1));
					if (askScale < 0)
					{yscale = myComp.height/(ymax-ymin);}
					else
					{yscale = askScale;}
				}
			
				xoffset = parseFloat(prompt("X offset:", 0));
				yoffset = parseFloat(prompt("Y offset:", 0));
				
				for (i = 0; i < vertexArray.length; i++)
				{
					vertexArray[i][0] *= xscale;
					vertexArray[i][1] *= yscale;
					
					vertexArray[i][0] += xoffset;
					vertexArray[i][1] += yoffset;
				}
			
				myShape.vertices = vertexArray;
				myShape.closed = false;
				myMaskShape.setValue(myShape);
		
				alert("STATS \n     Points: "+vertexArray.length+"     \n     X Scale: "+xscale+"     \n     Y Scale: "+yscale+"     \n     Center X: "+xoffset+"     \n     Center Y: "+yoffset);
		
				myFile.close();
				app.endUndoGroup();
			}
			else
			{alert("Error opening text file");}
		}
		else
		{alert("Exactly one layer must be selected");} 
	}
	else 
	{alert("No comp");}
}
else
{alert("No project");}