Add surface distance measurement to mouse click handler

Dependencies

• [2] IGYI5RVV Figure out how to draw on the sdl2 window
• [3] J6HV4MNJ Model trainer: mouse click handler (prints normalized vector from planet's center)
• [4] ROQCAPZJ Begin function for showing the map (for now just opens SDL window)

Change contents

• edit in trainmodel/src/drawmap.py at line 16
  [4.235]

  [2.16]
  + last_clicked = None
• replacement in trainmodel/src/drawmap.py at line 35
  [3.53]→[3.53:135](∅→∅)
  − print(list(inputs[event.button.y * 1024 + event.button.x].numpy()))
  [3.53]

  [4.408]
  + point = list(inputs[event.button.y * 1024 + event.button.x].numpy())

  + if last_clicked != None:

  + dug = math.sqrt(sum(map((lambda p: (p[0]-p[1])**2), zip(last_clicked, point))))

  + arc = math.acos(1 - dug**2 / 2) # cosine rule, a == b == 1

  + print('%s Km | %s miles' % (arc * 6372.0, arc * 3959.377))

  + print(point)

  + last_clicked = point