Coverage for pyguymer3/geo/_add_playas.py: 3%

1#!/usr/bin/env python3 

2 

3# Define function ... 

4def _add_playas( 

5 ax, 

6 /, 

7 *, 

8 debug = __debug__, 

9 fov = None, 

10 linestyle = "solid", 

11 linewidth = 0.5, 

12 onlyValid = False, 

13 repair = False, 

14 resolution = "10m", 

15): 

16 """Add playas to a Cartopy axis. 

17 

18 Parameters 

19 ---------- 

20 axis : cartopy.mpl.geoaxes.GeoAxesSubplot 

21 the axis to add the playas to 

22 debug : bool, optional 

23 print debug messages 

24 fov : None or shapely.geometry.polygon.Polygon, optional 

25 clip the plotted shapes to the provided field-of-view to work around 

26 occaisional MatPlotLib or Cartopy plotting errors when shapes much 

27 larger than the field-of-view are plotted 

28 linestyle : str, optional 

29 the style of the exterior of the playas 

30 linewidth : float, optional 

31 the width of the exterior of the playas 

32 onlyValid : bool, optional 

33 only add valid Polygons (checks for validity can take a while, if being 

34 being called often) 

35 repair : bool, optional 

36 attempt to repair invalid Polygons 

37 resolution : str, optional 

38 the resolution of the playas 

39 

40 Notes 

41 ----- 

42 This function uses `CSS4 named colours 

43 <https://matplotlib.org/stable/gallery/color/named_colors.html>`_ . 

44 

45 Copyright 2017 Thomas Guymer [1]_ 

46 

47 References 

48 ---------- 

49 .. [1] PyGuymer3, https://github.com/Guymer/PyGuymer3 

50 """ 

51 

52 # Import standard modules ... 

53 import pathlib 

54 import urllib 

55 

56 # Import special modules ... 

57 try: 

58 import cartopy 

59 cartopy.config.update( 

60 { 

61 "cache_dir" : pathlib.PosixPath("~/.local/share/cartopy_cache").expanduser(), 

62 } 

63 ) 

64 except: 

65 raise Exception("\"cartopy\" is not installed; run \"pip install --user Cartopy\"") from None 

66 try: 

67 import matplotlib 

68 matplotlib.rcParams.update( 

69 { 

70 "backend" : "Agg", # NOTE: See https://matplotlib.org/stable/gallery/user_interfaces/canvasagg.html 

71 "figure.dpi" : 300, 

72 "figure.figsize" : (9.6, 7.2), # NOTE: See https://github.com/Guymer/misc/blob/main/README.md#matplotlib-figure-sizes 

73 "font.size" : 8, 

74 } 

75 ) 

76 except: 

77 raise Exception("\"matplotlib\" is not installed; run \"pip install --user matplotlib\"") from None 

78 

79 # Import sub-functions ... 

80 from .extract_polys import extract_polys 

81 

82 # ************************************************************************** 

83 

84 # Create suitable colours ... 

85 edgecolor = matplotlib.colors.to_rgba(matplotlib.colors.CSS4_COLORS["cornflowerblue"]) 

86 facecolor = matplotlib.colors.to_rgba(matplotlib.colors.CSS4_COLORS["khaki"]) 

87 if debug: 

88 print(f"INFO: \"playas\" is ({edgecolor[0]:.6f},{edgecolor[1]:.6f},{edgecolor[2]:.6f},{edgecolor[3]:.6f}) and ({facecolor[0]:.6f},{facecolor[1]:.6f},{facecolor[2]:.6f},{facecolor[3]:.6f}).") 

89 

90 # Find file containing the shapes ... 

91 try: 

92 sfile = cartopy.io.shapereader.natural_earth( 

93 resolution = resolution, 

94 category = "physical", 

95 name = "playas", 

96 ) 

97 except urllib.error.HTTPError: 

98 return 

99 if debug: 

100 print(f"INFO: \"playas\" is \"{sfile}\".") 

101 

102 # Loop over records ... 

103 for record in cartopy.io.shapereader.Reader(sfile).records(): 

104 # Skip bad records ... 

105 if not hasattr(record, "geometry"): 

106 continue 

107 

108 # Create a list of Polygons to plot (taking in to account if the user 

109 # provided a field-of-view to clip them by) ... 

110 polys = [] 

111 for poly in extract_polys( 

112 record.geometry, 

113 onlyValid = onlyValid, 

114 repair = repair, 

115 ): 

116 if fov is None: 

117 polys.append(poly) 

118 continue 

119 if poly.disjoint(fov): 

120 continue 

121 polys.append(poly.intersection(fov)) 

122 

123 # Plot geometry ... 

124 ax.add_geometries( 

125 polys, 

126 cartopy.crs.PlateCarree(), 

127 edgecolor = edgecolor, 

128 facecolor = facecolor, 

129 linestyle = linestyle, 

130 linewidth = linewidth, 

131 )