Feat: Add water/land colors (#21)

Author: kevinddchen

wavey/__main__.py

@@ -191,6 +191,8 @@ def main(
         lon_min_idx=20,
         lon_max_idx=70,
         resolution=resolution,
+        water_color=None,
+        land_color=None,
     )
 
     LOG.info("Drawing Breakwater map")

wavey/map.py

@@ -143,6 +143,8 @@ def __init__(
         resolution: RESOLUTION = "h",
         draw_arrows_length: float = DEFAULT_ARROW_LENGTH,
         draw_arrows_stride: int = 3,
+        water_color: str | None = "lightcyan",
+        land_color: str | None = "wheat",
     ) -> None:
         """
         Map plotting wave height as a colormap and wave direction with arrows.
@@ -165,6 +167,8 @@ def __init__(
             draw_arrows_length: Length of arrows.
             draw_arrows_stride: Create an arrow for every multiple of `stride`
                 indicies.
+            water_color: Color of water.
+            land_color: Color of land.
         """
 
         # NOTE: not sure why this offset is needed, but looks better with it
@@ -198,6 +202,11 @@ def __init__(
         )
         map.drawcoastlines()
 
+        if water_color is not None:
+            map.drawmapboundary(fill_color=water_color)
+        if land_color is not None:
+            map.fillcontinents(color=land_color)
+
         if self.wave_height_ft is not None:
             self.img = map.imshow(
                 self.wave_height_ft[0],