CanvasToLayerY("backdrop",0,0)  // top of screen
CanvasToLayerY("backdrop", WindowWidth, WindowHeight)  // bottom of screen
CanvasToLayerX("backdrop",WindowWidth, WindowHeight)  // right side of screen
CanvasToLayerX("backdrop",0,0)  // left side of screen
[/code:1x97qc0t]
I use these to make my user interfaces in Construct fully dynamic (i.e. if the user resizes the window, Construct will automatically resize everything inside).

Note: "backdrop" is my primary display layer's name.

public class C2 {
	//-------------------------------------------------------------------------------------------------------------------
	// Method to output Construct-compatible JSON Array structures
	//-------------------------------------------------------------------------------------------------------------------
	public static String outputToC2Array(ArrayList<String> list){
		
		StringBuilder sb = new StringBuilder("");
		try{
			if(list!=null && list.size()>0){
				sb.append("{\\\"c2array\\\":true,\\\"size\\\":[" + list.size() + ",1,1],\\\"data\\\":[");
				
				for(int i=0 ; i < list.size() ; i++){
					sb.append("[[" + list.get(i) + "]]");
					if(i < list.size() - 1) sb.append(","); //skips the last comma
				}				
				sb.append("]}");
			}
			return sb.toString().replaceAll("\\\\\"", "\"");
		} finally {
			sb = null;
		}
	}
	//-------------------------------------------------------------------------------------------------------------------
	// Method to reconstruct arrays from Construct-compatible JSON strings
	//-------------------------------------------------------------------------------------------------------------------
	public static ArrayList<String> arrayFromC2jsonString(String c2json){
		ArrayList<String> returnList = new ArrayList<String>();
		try{
			if(c2json.contains("data\":")){
				String subS = c2json.substring(c2json.indexOf("data\":", 0)+9, c2json.length()-4);
				String[] pieces = subS.split("\\]\\],\[\[");
				for(String piece : pieces){
					returnList.add(piece);
				}
			}
			return returnList;
		}finally{
			returnList = null;
		}
	}
}
[/code:cwm5su9d]

Basically, I just parse the array into a C2-friendly JSON string.