fontsize options

closes #181 (closed)

• Implement option Base Font Size in Menu Options that allows user to select a base font size for texts in plotting.
• For font size from 9 to 12, plot's label will be split into 2 lines if the plot has no additional info.
• Plot height and figure height will be spread out according to selected font size.

sohstationviewer/view/plotting/plotting_widget/plotting_widget.py

@@ -305,9 +305,18 @@ class PlottingWidget(QtWidgets.QScrollArea):
         Set height of figure and main widget according to total of plotting
         channels' heights.
 
+        Vertical_ratio and fig_height_in_ratio are used to spread out plotting.
+        However, TPS channels won't need to be spread out.
+
         Calculate height_normalizing_factor.
         """
         self.set_size()
+        # Don't need to spead out channels for TPS
+        vertical_ratio = (self.main_window.vertical_ratio
+                          if self.name != 'TPS' else 1)
+        if self.name != 'TPS':
+            self.fig_height_in *= self.main_window.fig_height_in_ratio
+
         fig_height = math.ceil(self.fig_height_in * self.dpi_y)
 
         # adjusting main_widget to fit view port
@@ -325,8 +334,7 @@ class PlottingWidget(QtWidgets.QScrollArea):
         # with height ratio of an item to fit in figure height start from
         # 1 to 0.
         normalize_total = math.ceil(self.fig_height_in / const.BASIC_HEIGHT_IN)
-        self.height_normalizing_factor = \
-            self.main_window.font_ratio / normalize_total
+        self.height_normalizing_factor = vertical_ratio / normalize_total
 
         if fig_height < max_height:
             # to avoid artifact in main widget's section that isn't covered by
@@ -341,8 +349,7 @@ class PlottingWidget(QtWidgets.QScrollArea):
 
         self.plotting_axes.fig.set_figheight(self.fig_height_in)
         self.plotting_axes.height_normalizing_factor = \
-            self.height_normalizing_factor * \
-            self.main_window.font_ratio
+            self.height_normalizing_factor * vertical_ratio
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