draw orbital paths

src/main.lua

@@ -78,10 +78,6 @@ local ore_types = { "iron ore", "copper ore", "warp fuel", }
 --   cargo_types[cargo_types[i]] = i
 -- end
 
--- TODO review my previous orbits code to add extremely slow background orbits to this
---       planets/stars/stations always have fixed orbits; ships have a fixed orbital acceleration but have their own additional
---        the "zero relative velocity" key will be a burn whatever amount of fuel/acceleration necessary to match local acceleration
---         which.. since the currently stored velocity is a COMPLETELY SEPARATE SYSTEM - is literally just zeroing velocity which makes it even simpler to execute
 local player_ship = {
   position_x = 100,
   position_y = 100,
@@ -101,6 +97,7 @@ local player_ship = {
   -- TODO fuel capacity and use (idle and while acceleration)
   -- TODO cargo / mass affects acceleration
 }
+player_ship.orbital_radius = math.sqrt(player_ship.position_x^2 + player_ship.position_y^2)
 
 local resource_points = {} -- NOTE they're "planets" but I intend for them to be multiple things tbh
 local function make_resource_point(x, y)
@@ -183,11 +180,11 @@ function love.update(dt)
   player_ship.position_x = player_ship.position_x + player_ship.velocity_x * dt
   player_ship.position_y = player_ship.position_y + player_ship.velocity_y * dt
 
-  local player_radius = math.sqrt(player_ship.position_x^2 + player_ship.position_y^2)
+  player_ship.orbital_radius = math.sqrt(player_ship.position_x^2 + player_ship.position_y^2)
   local player_rotation_offset = math.atan2(player_ship.position_y, player_ship.position_x)
-  local x, y = math.cos(dt / player_radius / (1 / orbital_speed_constant) + player_rotation_offset), math.sin(dt / player_radius / (1 / orbital_speed_constant) + player_rotation_offset)
-  player_ship.position_x = x * player_radius
-  player_ship.position_y = y * player_radius
+  local x, y = math.cos(dt / player_ship.orbital_radius / (1 / orbital_speed_constant) + player_rotation_offset), math.sin(dt / player_ship.orbital_radius / (1 / orbital_speed_constant) + player_rotation_offset)
+  player_ship.position_x = x * player_ship.orbital_radius
+  player_ship.position_y = y * player_ship.orbital_radius
 
   for i = 1, #resource_points do
     local current_point = resource_points[i]
@@ -244,7 +241,11 @@ function love.draw()
   for i = 1, #resource_points do
     local current_point = resource_points[i]
     love.graphics.circle("line", current_point.position_x, current_point.position_y, current_point.radar_size)
+
+    -- TODO make this "behind" other objects (and toggleable? and a different color?)
+    love.graphics.circle("line", 0, 0, current_point.orbital_radius)
   end
+  love.graphics.circle("line", 0, 0, player_ship.orbital_radius)
 
   love.graphics.translate(-camera_offset.x, -camera_offset.y)
   love.graphics.print(last_message, 1, 1)