On the Line – Rocket Through - Cocos2d-x by Example Beginner's Guide - page 163

break;
}
2. We end our drawing calls by drawing the energy bar in the same LineCon-
tainer node:
drawLine(Vec2(_energyLineX, _screenSize.height *
0.1f), Vec2(_energyLineX, _screenSize.height *
0.9f), Color4F(0.0, 0.0, 0.0, 1.0));
drawLine(Vec2(_energyLineX, _screenSize.height *
0.1f), Vec2(_energyLineX, _screenSize.height * 0.1f
+ _energy * _energyHeight ), Color4F(1.0, 0.5, 0.0,
1.0));