# Class things:
var name = 'TFC';
var parents = [DotSym];
var __self__ = caller(0)[0];
DotSym.makeinstance( name, __self__ );

var element_type = "group"; # we want a group, becomes "me.element"
var text_tcas = nil;
var icon_tcas = nil;
var arrow_tcas = [nil,nil];
var arrow_type = nil;

var draw_tcas_arrow = nil;

var draw = func {
	if (me.draw_tcas_arrow == nil)
		me.draw_tcas_arrow = [
			draw_tcas_arrow_above_500,
			draw_tcas_arrow_below_500
		];
	#var callsign = me.model.getNode("callsign").getValue();
	# print("Drawing traffic for:", callsign );
	var threatLvl = me.controller.get_threat_lvl(me.model);
	var vspeed = me.controller.get_vspd(me.model);
	var altDiff = me.controller.get_alt_diff(me.model);
	# Init
	if (me.text_tcas == nil) {
		me.text_tcas = me.element.createChild("text")
			.setDrawMode( canvas.Text.TEXT )
			.setText(sprintf("%+02.0f",altDiff/100))
			.setFont("LiberationFonts/LiberationSans-Regular.ttf")
			.setColor(1,1,1)
			.setFontSize(28)
			.setAlignment("center-center");
		me.icon_tcas = me.element.createChild("path")
			.setStrokeLineWidth(3);
	}
	# Update
	if (altDiff > 0)
		me.text_tcas.setTranslation(0,-40);
	else
		me.text_tcas.setTranslation(0,40);
	var arrow_type = (vspeed >= 500);
	if (arrow_type != me.arrow_type) {
		(old_type, me.arrow_type) = (me.arrow_type, arrow_type);
		if (old_type != nil and me.arrow_tcas[old_type] != nil) me.arrow_tcas[old_type].hide();
		if (me.arrow_tcas[arrow_type] == nil)
			me.arrow_tcas[arrow_type] = me.draw_tcas_arrow[arrow_type](me.element);
		me.arrow_tcas[arrow_type].show();
	}
	## TODO: threat level symbols should also be moved to *.draw files
	if (threatLvl == 3) {
		# resolution advisory
		me.icon_tcas.moveTo(-17,-17)
			.horiz(34)
			.vert(34)
			.horiz(-34)
			.close()
			.setColor(1,0,0)
			.setColorFill(1,0,0);
		me.text_tcas.setColor(1,0,0);
		me.arrow_tcas.setColor(1,0,0);
	} elsif (threatLvl == 2) {
		# traffic advisory
		me.icon_tcas.moveTo(-17,0)
			.arcSmallCW(17,17,0,34,0)
			.arcSmallCW(17,17,0,-34,0)
			.setColor(1,0.5,0)
			.setColorFill(1,0.5,0);
		me.text_tcas.setColor(1,0.5,0);
		me.arrow_tcas.setColor(1,0.5,0);
	} elsif (threatLvl == 1) {
		# proximate traffic
		me.icon_tcas.moveTo(-10,0)
			.lineTo(0,-17)
			.lineTo(10,0)
			.lineTo(0,17)
			.close()
			.setColor(1,1,1)
			.setColorFill(1,1,1);
	} else {
		# other traffic
		me.icon_tcas.moveTo(-10,0)
			.lineTo(0,-17)
			.lineTo(10,0)
			.lineTo(0,17)
			.close()
			.setColor(1,1,1);
	}
};