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local function count_classes(pilots)
local class_count = {}
for i, p in ipairs(pilots) do
if class_count[p:ship():class()] == nil then
class_count[p:ship():class()] = 1
else
class_count[p:ship():class()] = class_count[p:ship():class()] + 1
end
end
return class_count
end
local formations = {}
function formations.cross(leader)
local pilots = leader:followers()
-- Cross logic. Forms an X.
local angle = 45 -- Spokes start rotated at a 45 degree angle.
local radius = 100 -- First ship distance.
for i, p in ipairs(pilots) do
leader:msg(p, "form-pos", {angle, radius})
angle = (angle + 90) % (360) -- Rotate spokes by 90 degrees.
radius = 100 * (math.floor(i / 4) + 1) -- Increase the radius every 4 positions.
end
end
function formations.buffer(leader)
-- Buffer logic. Consecutive arcs emanating from the fleader. Stored as polar coordinates.
local pilots = leader:followers()
local class_count = count_classes(pilots)
local angle, radius
local radii = {Scout = 1200, Drone = 1500, Fighter = 900, Bomber = 850, Corvette = 700, Destroyer = 500, Cruiser = 350, Carrier = 250} -- Different radii for each class.
local count = {Scout = 1, Drone = 1, Fighter = 1, Bomber = 1, Corvette = 1, Destroyer = 1, Cruiser = 1, Carrier = 1} -- Need to keep track of positions already iterated through.
for i, p in ipairs(pilots) do
ship_class = p:ship():class() -- For readability.
if class_count[ship_class] == 1 then -- If there's only one ship in this specific class...
angle = 0 --The angle needs to be zero.
else -- If there's more than one ship in each class...
angle = ((count[ship_class]-1)*(90/(class_count[ship_class]-1)))-45 -- ..the angle rotates from -45 degrees to 45 degrees, assigning coordinates at even intervals.
count[ship_class] = count[ship_class] + 1 --Update the count
end
radius = radii[ship_class] --Assign the radius, defined above.
leader:msg(p, "form-pos", {angle, radius})
end
end
function formations.vee(leader)
-- The vee formation forms a v, with the fleader at the apex, and the arms extending in front.
local pilots = leader:followers()
local angle = 45 -- Arms start at a 45 degree angle.
local radius = 100 -- First ship distance.
for i, p in ipairs(pilots) do
leader:msg(p, "form-pos", {angle, radius})
angle = angle * -1 -- Flip the arms between -45 and 45 degrees.
radius = 100 * (math.floor(i / 2) + 1) -- Increase the radius every 2 positions.
end
end
function formations.wedge(leader)
-- The wedge formation forms a v, with the fleader at the apex, and the arms extending out back.
local pilots = leader:followers()
local flip = -1
local angle = (flip * 45) + 180
local radius = 100 -- First ship distance.
for i, p in ipairs(pilots) do
leader:msg(p, "form-pos", {angle, radius})
flip = flip * -1
angle = (flip * 45) + 180 -- Flip the arms between 135 and 215 degrees.
radius = 100 * (math.floor(i / 2) + 1) -- Increase the radius every 2 positions.
end
end
function formations.echelon_left(leader)
--This formation forms a "/", with the fleader in the middle.
local pilots = leader:followers()
local radius = 100
local flip = -1
local angle = 135 + (90 * flip) --Flip between 45 degrees and 225 degrees.
for i, p in ipairs(pilots) do
leader:msg(p, "form-pos", {angle, radius})
flip = flip * -1
angle = 135 + (90 * flip)
radius = 100 * (math.ceil((i+1) / 2)) -- Increase the radius every 2 positions
end
end
function formations.echelon_right(leader)
--This formation forms a "\", with the fleader in the middle.
local pilots = leader:followers()
local radius = 100
local flip = 1
local angle = 225 + (90 * flip) --Flip between 315 degrees, and 135 degrees
for i, p in ipairs(pilots) do
leader:msg(p, "form-pos", {angle, radius})
flip = flip * -1
angle = 225 + (90 * flip)
radius = 100 * (math.ceil((i+1) / 2))
end
end
function formations.column(leader)
--This formation is a simple "|", with fleader in the middle.
local pilots = leader:followers()
local radius = 100
local flip = -1
local angle = 90 + (90 * flip) --flip between 0 degrees and 180 degrees
for i, p in ipairs(pilots) do
leader:msg(p, "form-pos", {angle, radius})
flip = flip * -1
angle = 90 + (90 * flip)
radius = 100 * (math.ceil((i+1)/2)) --Increase the radius every 2 ships.
end
end
function formations.wall(leader)
--This formation is a "-", with the fleader in the middle.
local pilots = leader:followers()
local radius = 100
local flip = -1
local angle = 180 + (90 * flip) --flip between 90 degrees and 270 degrees
for i, p in ipairs(pilots) do
leader:msg(p, "form-pos", {angle, radius})
flip = flip * -1
angle = 180 + (90 * flip)
radius = 100 * (math.ceil((i+1)/2)) --Increase the radius every 2 ships.
end
end
function formations.fishbone(leader)
local pilots = leader:followers()
local radius = 500
local flip = -1
local orig_radius = radius
local angle = (22.5 * flip) / (radius / orig_radius)
for i, p in ipairs(pilots) do
leader:msg(p, "form-pos", {angle, radius})
if flip == 0 then
flip = -1
radius = (orig_radius * (math.ceil((i+1)/3))) + ((orig_radius * (math.ceil((i+1)/3))) / 30)
elseif flip == -1 then
flip = 1
elseif flip == 1 then
flip = 0
radius = orig_radius * (math.ceil((i+1)/3))
end
angle = (22.5 * flip) / (radius / orig_radius)
end
end
function formations.chevron(leader)
local pilots = leader:followers()
local radius = 500
local flip = -1
local orig_radius = radius
local angle = (22.5 * flip) / (radius / orig_radius)
for i, p in ipairs(pilots) do
leader:msg(p, "form-pos", {angle, radius})
if flip == 0 then
flip = -1
radius = (orig_radius * (math.ceil((i+1)/3))) - ((orig_radius * (math.ceil((i+1)/3))) / 20)
elseif flip == -1 then
flip = 1
elseif flip == 1 then
flip = 0
radius = orig_radius * (math.ceil((i+1)/3))
end
angle = (22.5 * flip) / (radius / orig_radius)
end
end
function formations.circle(leader)
-- Default to circle.
local pilots = leader:followers()
local angle = 360 / #pilots -- The angle between each ship, in radians.
local radius = 80 + #pilots * 25 -- Pulling these numbers out of my ass. The point being that more ships mean a bigger circle.
for i, p in ipairs(pilots) do
leader:msg(p, "form-pos", {angle * i, radius, "absolute"})
end
end
local keys = {}
for k, _ in pairs(formations) do
keys[#keys+1] = k
end
formations.keys = keys
-- Clear formation; not really a 'formation' so it is not in keys
function formations.clear(leader)
leader:msg(leader:followers(), "form-pos", nil)
end
function formations.random_key()
return keys[rnd.rnd(1, #keys)]
end
return formations
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