IShape.java
    model.interfaces.IShape.addX                    16
    model.interfaces.IShape.addY                    18
    model.interfaces.IShape.contain                 20
    model.interfaces.IShape.draw                    28
    model.interfaces.IShape.setPrimaryColor         60
    model.interfaces.IShape.setShadingColor         64
    model.interfaces.IShape.setStroke               66