Linted and reformatted per pre-commit

Author: tekktrik

displayio_cartesian.py

@@ -319,7 +319,7 @@ def __init__(
         self._circle_palette = None
         self.plot_line_point = None
 
-        self._fill_area = False
+        self._fill_area = fill_area
 
     @staticmethod
     def _get_font_height(font, scale: int) -> Tuple[int, int]:
@@ -595,7 +595,6 @@ def update_pointer(self, x: int, y: int) -> None:
         :param int x: ``x`` coordinate in the local plane
         :param int y: ``y`` coordinate in the local plane
         :return: None
-        rtype: None
         """
         self._add_point(x, y)
         if not self._pointer:
@@ -609,6 +608,7 @@ def update_pointer(self, x: int, y: int) -> None:
 
     @property
     def fill_area(self) -> bool:
+        """Whether the area under the graph (integral) should be shaded"""
         return self._fill_area
 
     @fill_area.setter
@@ -640,42 +640,52 @@ def add_plot_line(self, x: int, y: int) -> None:
 
                 delta_x = self.plot_line_point[-2][0] - self.plot_line_point[-1][0]
                 delta_y = self.plot_line_point[-2][1] - self.plot_line_point[-1][1]
-                delta_y_product = self.plot_line_point[-1][1] * self.plot_line_point[-2][1]
+                delta_y_product = (
+                    self.plot_line_point[-1][1] * self.plot_line_point[-2][1]
+                )
 
                 if delta_x == 0:
                     return
 
-                slope = delta_y/delta_x
-                above_x_axis = False if slope > 0 else True
+                slope = delta_y / delta_x
 
                 if delta_y_product < 0:
-                    # TODO: Area needs to be split into two triangles 
-                    
-                    c = self.plot_line_point[-1][1]
-                    zero_point_x = (-1 * c)/slope
+                    # TODO: Area needs to be split into two triangles
+
+                    intercept = self.plot_line_point[-1][1]
+                    zero_point_x = (-1 * intercept) / slope
 
                     self._draw_area_under(self.plot_line_point[-2], (zero_point_x, 0))
                     self._draw_area_under((zero_point_x, 0), self.plot_line_point[-1])
 
                 else:
 
-                    point_to_check = self.plot_line_point[-1] if self.plot_line_point[-1][1] != 0 else self.plot_line_point[-2]
-                    above_x_axis = point_to_check[1] > 0
+                    point_to_check = (
+                        self.plot_line_point[-1]
+                        if self.plot_line_point[-1][1] != 0
+                        else self.plot_line_point[-2]
+                    )
 
-                    self._draw_area_under(self.plot_line_point[-2], self.plot_line_point[-1])
+                    self._draw_area_under(
+                        self.plot_line_point[-2], self.plot_line_point[-1]
+                    )
 
-    def _draw_area_under(self, xy0: Tuple[float, float], xy1: Tuple[float, float]) -> None:
+    def _draw_area_under(
+        self, xy0: Tuple[float, float], xy1: Tuple[float, float]
+    ) -> None:
 
         _, plot_y_zero = self._calc_local_xy(0, 0)
 
         delta_x = self.plot_line_point[-2][0] - self.plot_line_point[-1][0]
         delta_y = self.plot_line_point[-2][1] - self.plot_line_point[-1][1]
-        slope = delta_y/delta_x
+        slope = delta_y / delta_x
 
-        for pixel_x in range(xy0[0], xy1[0]+1):
+        for pixel_x in range(xy0[0], xy1[0] + 1):
             if pixel_x != xy1[0]:
-                pixel_y = round(slope*(pixel_x-xy1[0]) + xy1[1])
-            bitmaptools.draw_line(self._plot_bitmap, pixel_x, pixel_y, pixel_x, plot_y_zero, 1)
+                pixel_y = round(slope * (pixel_x - xy1[0]) + xy1[1])
+            bitmaptools.draw_line(
+                self._plot_bitmap, pixel_x, pixel_y, pixel_x, plot_y_zero, 1
+            )
 
     def clear_plot_lines(self, palette_index=5):
         """clear_plot_lines function.