//
// Name: Labels Demo.
// License: Public Domain
// Author: Matthew Gates
// Description: Example script to show how to use LabelMgr
//

// set default view, location and date.
LabelMgr.deleteAllLabels();
core.clear("natural");
core.setObserverLocation("York, UnitedKingdom");
core.setTimeRate(1); 
core.setDate("2008:10:30T21:00:00");
core.moveToAltAzi(30, 90);
StelMovementMgr.zoomTo(70, 2);
core.wait(2.5);

// When you create a label, the return value is an ID of a label which 
// is subsequently used to refer to that label when calling functions
// in the label manager (e.g. turning the label on and off)

// This function prints a line of text at a fixed place on the screen
// pauses for a few seconds and then hides the text.  I will use this
// for providing information to the user.
//
// The label is created in an "off" state, and then faded in and out.
// The label is deleted after it has been displayed.
function commentary(text)
{
	commentary_at(text, 30, 30);
}

function commentary_at(text, x, y)
{
	var id = LabelMgr.labelScreen(text, x, y, false, 20, "#aaaaaa");
	LabelMgr.setLabelShow(id, true);
	core.wait(2);
	LabelMgr.setLabelShow(id, false);
	core.wait(1);
	LabelMgr.deleteLabel(id);
}

commentary("This script is a test of LabelMgr.");
commentary("Labels can be fixed to screen x,y values...");
commentary_at("0,0", 0, 0);
commentary_at("100,100", 100, 100);
commentary_at("0,400", 0, 400);
commentary_at("600,20", 600, 20);
commentary("Or they can be attached to a named object...");

var myOb = "HP 21421"; // Aldebaran
var id = LabelMgr.labelObject("A bright star!" , myOb, false, 16, "#aaaaaa", "S", 10);
LabelMgr.setLabelShow(id, true);
core.wait(1);

commentary("The label above is connected to " + myOb);
core.setTimeRate(150);
commentary("Watch as the time advances");
commentary("The label is stuck to the object");
core.setTimeRate(1);
LabelMgr.deleteLabel(id);

commentary("You can display object labels in different positions...")
commentary("Use cardinal point names to choose");

var sides  = new Array("N", "NE", "E", "SE", "S", "SW", "W", "NW");
var position_ids = new Array();

// create labels and turn them on with a short staggering.
for (i=0; i<sides.length; i++)
{
	position_ids[i] = LabelMgr.labelObject(sides[i], myOb, false, 16, "#aaaaaa", sides[i], 20);
	core.wait(0.4);
	LabelMgr.setLabelShow(position_ids[i], true);
}

core.wait(3);

// turn off the labels in a staggered manner.
for (i=0; i<position_ids.length; i++)
{
	LabelMgr.setLabelShow(position_ids[i], false);
	core.wait(0.4);
}

commentary("You can also use different styles and distances from the object");

id1 = LabelMgr.labelObject("Without a line to the object", myOb, false, 16, "#aaaaaa", "NW", 30, "TextOnly");
id2 = LabelMgr.labelObject("With a line to the object", myOb, false, 16, "#aaaaaa", "SE", 150, "Line");
LabelMgr.setLabelShow(id1, true);
LabelMgr.setLabelShow(id2, true);
core.wait(4);
LabelMgr.setLabelShow(id1, false);
LabelMgr.setLabelShow(id2, false);

commentary("Finally, you can use different colors");

var colors = new Array("#ff0000", "#ff3300", "#ff6600", "#ff9900", "#ffcc00", "#ffff00", "#ffff33", "#ffff99");
var color_ids = new Array();

for(i=0; i<colors.length; i++)
{
	color_ids[i] = LabelMgr.labelScreen("This label uses color " + colors[i],
	                                    100, 200 + (50 * i), false, 20, colors[i]);
	LabelMgr.setLabelShow(color_ids[i], true);
	core.wait(0.4);
}

core.wait(2);

// turn off the labels in a staggered manner.
for (i=0; i<color_ids.length; i++)
{
	LabelMgr.setLabelShow(color_ids[i], false);
	core.wait(0.4);
}

commentary("OK, hope you enjoyed this script.  Bye!");

// delete any labels we didn't already cleaned up.
LabelMgr.deleteAllLabels();