Use named variables for planetary radius

Dependencies

• [2] 3AJMKZ7C Model trainer: include land mass calculation in click handler
• [3] ROQCAPZJ Begin function for showing the map (for now just opens SDL window)
• [4] PG7KSKJL Add surface distance measurement to mouse click handler
• [*] E742MTJA Fix segfault (don't pass pointers between functions in different SDL versions), minor refactor

Change contents

• edit in trainmodel/src/drawmap.py at line 10
  [6.87]

  [6.87]
  +

  + planet_radius_km = 6378.1

  + planet_radius_miles = planet_radius_km * 1.60934
• replacement in trainmodel/src/drawmap.py at line 39
  [2.1969]→[2.1969:2093](∅→∅)
  − print('Clicked land mass: %s square Km | %s square miles' % (solid_angle * 6372.0**2, solid_angle * 3959**2))
  [2.1969]

  [3.106]
  + print('Clicked land mass: %s square Km | %s square miles' % (solid_angle * planet_radius_km**2, solid_angle * planet_radius_miles**2))
• replacement in trainmodel/src/drawmap.py at line 43
  [3.320]→[3.320:397](∅→∅)
  − print('%s Km | %s miles' % (arc * 6372.0, arc * 3959.377))
  [3.320]

  [3.397]
  + print('%s Km | %s miles' % (arc * planet_radius_km, arc * planet_radius_miles))