// After Effects script - import property keyframes from text file
// By Vincent Rubinetti
// 08 -  12 - 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)
         {         
			var myLayer = selectedLayers[0];
			var selectedProps = myLayer.selectedProperties;
			if(selectedProps.length == 3)
			{				
				alert("Select a text file with data points");
				var myFile = File.openDialog ("Select text file with data points");  
				if (myFile)
				{
				var fileOK = myFile.open("r","TEXT","????");}
				if (fileOK)
				{
					var undoStr = "Import Keyframes";
					app.beginUndoGroup(undoStr);
					
					var myLayer = selectedLayers[0];
	
					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, 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));
				
					var timeArray = new Array();
					var xArray = new Array();
					var yArray = new Array();
					for (i = 0; i < vertexArray.length; i++)
					{
						vertexArray[i][0]  = (vertexArray[i][0])*xscale;
						vertexArray[i][1] = (vertexArray[i][1])*yscale;
						
						vertexArray[i][0] += xoffset;
						vertexArray[i][1] += yoffset;
							
						timeArray[i] = i*myComp.frameDuration;
						
						xArray[i] = vertexArray[i][0];
						yArray[i] = vertexArray[i][1];
					}
					
					selectedProps[1].setValuesAtTimes(timeArray,xArray);
					selectedProps[2].setValuesAtTimes(timeArray,yArray);

					alert("STATS \n     Points: "+vertexArray.length+"     \n     X Scale: "+xscale+"     \n     Y Scale: "+yscale+"     \n     Center X: "+((myComp.width/2)+xoffset)+"     \n     Center Y: "+((myComp.height/2)+yoffset));
					
					myFile.close();
					app.endUndoGroup();
				}
				}
				else
				{alert("Error opening text file");}				
			}
			else
			{alert("Exactly two properties must be selected");}
		}
		else
		{alert("Exactly one layer must be selected");} 
	}
	else 
	{alert("No comp");}
}
else
{alert("No project");}