def __init__(self, parent=None):
        super(AtomPropertiesWidget, self).__init__(parent)
        self.atom = None

        self.name_editor = QLineEdit()
        self.name_editor_groupbox = QGroupBox("Name")
        self.name_editor_groupbox_layout = QHBoxLayout()
        self.name_editor_groupbox.setLayout(self.name_editor_groupbox_layout)
        self.name_editor_groupbox_layout.addWidget(self.name_editor)
        self.name_editor_groupbox_layout.addStretch()

        main_layout = QVBoxLayout()
        main_layout.addWidget(self.name_editor_groupbox)
        main_layout.addStretch()
        self.setLayout(main_layout)

        self.name_editor.textChanged.connect(self.name_editor_text_changed)

        self.setDisabled(True)
    def __init__(self, parent=None):
        super(RadialForcePropertiesWidget, self).__init__(parent)
        self.radial_force = None

        self.name_editor = QLineEdit()
        self.name_editor_groupbox = QGroupBox("Name")
        self.name_editor_groupbox_layout = QHBoxLayout()
        self.name_editor_groupbox.setLayout(self.name_editor_groupbox_layout)
        self.name_editor_groupbox_layout.addWidget(self.name_editor)
        self.name_editor_groupbox_layout.addStretch()

        self.explicit_bezier_curve_widget = ExplicitBezierCurveWidget()

        main_layout = QVBoxLayout()
        main_layout.addWidget(self.name_editor_groupbox)
        main_layout.addWidget(self.explicit_bezier_curve_widget)
        main_layout.addStretch()
        self.setLayout(main_layout)

        self.name_editor.textChanged.connect(self.name_editor_text_changed)
        self.explicit_bezier_curve_widget.bezier_curve_changed.connect(self.bezier_curve_changed)

        self.setDisabled(True)
    def __init__(self, parent=None):
        super(ExplicitBezierCurveWidget, self).__init__(parent)

        graphics_view = QGraphicsView()

        def graphics_view_resize_event(event):
            assert isinstance(event, QResizeEvent)
            graphics_view.fitInView(QRectF(0, -SCENE_SIZE_2, SCENE_SIZE, SCENE_SIZE), Qt.KeepAspectRatio)
            super(QGraphicsView, graphics_view).resizeEvent(event)

        graphics_view.resizeEvent = graphics_view_resize_event
        self.explicit_bezier_curve_scene = ExplicitBezierCurveScene(self)
        graphics_view.setScene(self.explicit_bezier_curve_scene)
        graphics_view.setRenderHints(QPainter.Antialiasing | QPainter.SmoothPixmapTransform)

        properties_group_box = QGroupBox()
        properties_group_box.setTitle("Properties")

        properties_group_box_layout = QVBoxLayout()
        properties_group_box.setLayout(properties_group_box_layout)

        # Degree

        degree_layout = QHBoxLayout()
        properties_group_box_layout.addLayout(degree_layout)
        degree_label = QLabel("Polynomial degree")
        self.degree_spinbox = QSpinBox()
        self.degree_spinbox.setRange(MIN_POLYNOMIAL_DEGREE, MAX_POLYNOMIAL_DEGREE)
        self.degree_spinbox.setValue(POLYNOMIAL_DEGREE_DEFAULT)
        self.degree_spinbox.valueChanged.connect(self.process_degree_changed)
        degree_label.setBuddy(self.degree_spinbox)
        degree_layout.addWidget(degree_label)
        degree_layout.addWidget(self.degree_spinbox)

        # X - range

        x_layout = QHBoxLayout()
        x_label = QLabel("X:")
        x_layout.addWidget(x_label)
        properties_group_box_layout.addLayout(x_layout)

        min_x_value_label = QLabel("Min")
        x_layout.addWidget(min_x_value_label)
        self.min_x_value_spinbox = QDoubleSpinBox()
        x_layout.addWidget(self.min_x_value_spinbox)
        self.min_x_value_spinbox.setRange(MIN_X_VALUE, DEFAULT_MAX_X_VALUE-MIN_X_RANGE)
        self.min_x_value_spinbox.setValue(DEFAULT_MIN_X_VALUE)
        self.min_x_value_spinbox.valueChanged.connect(self.process_min_x_value_changed)

        max_x_value_label = QLabel("Max")
        x_layout.addWidget(max_x_value_label)
        self.max_x_value_spinbox = QDoubleSpinBox()
        x_layout.addWidget(self.max_x_value_spinbox)
        self.max_x_value_spinbox.setRange(DEFAULT_MIN_X_VALUE - MIN_X_RANGE, MAX_X_VALUE)
        self.max_x_value_spinbox.setValue(DEFAULT_MAX_X_VALUE)
        self.max_x_value_spinbox.valueChanged.connect(self.process_max_x_value_changed)

        # Y - range

        y_layout = QHBoxLayout()
        properties_group_box_layout.addLayout(y_layout)
        y_label = QLabel("Y:")
        y_layout.addWidget(y_label)

        min_y_value_label = QLabel("Min")
        y_layout.addWidget(min_y_value_label)
        self.min_y_value_spinbox = QDoubleSpinBox()
        self.min_y_value_spinbox.setRange(MIN_Y_VALUE, DEFAULT_MAX_Y_VALUE-MIN_Y_RANGE)
        self.min_y_value_spinbox.setValue(DEFAULT_MIN_Y_VALUE)
        self.min_y_value_spinbox.valueChanged.connect(self.process_min_value_changed)
        min_y_value_label.setBuddy(self.min_y_value_spinbox)
        y_layout.addWidget(self.min_y_value_spinbox)

        max_y_value_label = QLabel("Max")
        y_layout.addWidget(max_y_value_label)
        self.max_y_value_spinbox = QDoubleSpinBox()
        self.max_y_value_spinbox.setRange(DEFAULT_MIN_Y_VALUE - MIN_Y_RANGE, MAX_Y_VALUE)
        self.max_y_value_spinbox.setValue(DEFAULT_MAX_Y_VALUE)
        self.max_y_value_spinbox.valueChanged.connect(self.process_max_value_changed)
        max_y_value_label.setBuddy(self.max_y_value_spinbox)
        y_layout.addWidget(self.max_y_value_spinbox)

        properties_group_box_layout.addStretch()

        self.polynom_widget = LatexLabelWidget()

        main_layout = QVBoxLayout()

        upper_layout = QVBoxLayout()
        upper_layout.addWidget(graphics_view)
        upper_layout.addWidget(properties_group_box)

        main_layout.addLayout(upper_layout)
        main_layout.addWidget(self.polynom_widget)

        self.setLayout(main_layout)
        self.process_control_points_changed()
    def __init__(self, universe, parent=None):
        super(NaturalLawPropertiesWidget, self).__init__(parent)
        self.natural_law = None
        self.universe = universe

        self.name_editor = QLineEdit()
        self.name_editor_groupbox = QGroupBox("Name")
        self.name_editor_groupbox_layout = QHBoxLayout()
        self.name_editor_groupbox.setLayout(self.name_editor_groupbox_layout)
        self.name_editor_groupbox_layout.addWidget(self.name_editor)
        self.name_editor_groupbox_layout.addStretch()

        self.force_combo_box = QComboBox()
        self.force_combo_box.setModel(ForcesInUniverseListModel(universe))
        self.atom_in_combo_box = QComboBox()
        self.atom_in_combo_box.setModel(AtomsInUniverseListModel(universe))
        self.atom_out_combo_box = QComboBox()
        self.atom_out_combo_box.setModel(AtomsInUniverseListModel(universe))
        self.transformation_label = QLabel()

        self.conversion_scheme_groupbox = QGroupBox("Conversion scheme")
        self.conversion_scheme_groupbox.setVisible(False)
        self.conversion_scheme_groupbox_layout = QGridLayout()
        self.conversion_scheme_groupbox.setLayout(self.conversion_scheme_groupbox_layout)
        self.conversion_scheme_groupbox_layout.addWidget(self.atom_in_combo_box, 1, 0)
        self.conversion_scheme_groupbox_layout.addWidget(self.force_combo_box, 0, 1)
        self.conversion_scheme_groupbox_layout.addWidget(self.atom_out_combo_box, 1, 2)
        self.conversion_scheme_groupbox_layout.addWidget(self.transformation_label, 1, 1)

        self.conversion_rate_formula_label = LatexLabelWidget()

        self.multiplicative_component_label = QLabel(u"υ = ")
        self.multiplicative_component_label.setFont(QFont("Times New Roman", 15, italic=True))
        self.multiplicative_component_double_spinbox = QDoubleSpinBox()

        self.additive_component_label = QLabel(u"s = ")
        self.additive_component_label.setFont(QFont("Times New Roman", 15, italic=True))
        self.additive_component_double_spinbox = QDoubleSpinBox()

        self.conversion_rate_groupbox = QGroupBox("Conversion rate")
        self.conversion_rate_groupbox_layout = QGridLayout()
        self.conversion_rate_groupbox.setLayout(self.conversion_rate_groupbox_layout)
        self.conversion_rate_groupbox_layout.addWidget(self.conversion_rate_formula_label, 0, 0, 1, 2)
        self.conversion_rate_groupbox_layout.addWidget(self.multiplicative_component_label, 1, 0)
        self.conversion_rate_groupbox_layout.addWidget(self.multiplicative_component_double_spinbox, 1, 1)
        self.conversion_rate_groupbox_layout.addWidget(self.additive_component_label, 2, 0)
        self.conversion_rate_groupbox_layout.addWidget(self.additive_component_double_spinbox, 2, 1)

        main_layout = QVBoxLayout()
        main_layout.addWidget(self.name_editor_groupbox)
        main_layout.addWidget(self.conversion_scheme_groupbox)
        main_layout.addWidget(self.conversion_rate_groupbox)
        main_layout.addStretch()

        self.setLayout(main_layout)

        self.name_editor.textChanged.connect(self.name_editor_text_changed)
        self.multiplicative_component_double_spinbox.valueChanged.connect(self.multiplicative_component_value_changed)
        self.additive_component_double_spinbox.valueChanged.connect(self.additive_component_value_changed)

        self.atom_in_combo_box.currentIndexChanged.connect(self.atom_in_combo_box_current_index_changed)

        self.setDisabled(True)