61 lines
1.1 KiB
Lua
61 lines
1.1 KiB
Lua
BodyList = {}
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Body = class(nil,{type=0})
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function newBody(x,y,mass,color)
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local o = {}
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-- coordinates
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o.x = x
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o.y = y
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-- velocities
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o.vx = 0
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o.vy = 0
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-- accceleration
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o.ax = 0
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o.ay = 0
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-- mass
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o.mass = mass
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-- color
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o.color = color
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table.insert(BodyList,o)
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end
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function UpdateBodiesAcceleration()
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for n, body in pairs(BodyList) do
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local ax = 0
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local ay = 0
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for o_n, other_body in pairs(BodyList) do
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if n ~= o_n then
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local dx = other_body.x - body.x
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local dy = other_body.y - body.y
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local d2 = dx*dx + dy*dy
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local f =
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(CONST_G * other_body.mass) /
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d2 * math.sqrt(d2 + CONST_S)
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ax = ax + dx * f
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ay = ay + dy * f
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end
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end
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body.ax = ax
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body.ay = ay
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end
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end
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function UpdateBodiesVelocity(dt)
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for _, body in pairs(BodyList) do
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body.vx = body.vx + body.ax * dt
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body.vy = body.vy + body.ay * dt
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end
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end
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function UpdateBodiesPosition(dt)
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for _, body in pairs(BodyList) do
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body.x = body.x + body.vx * dt
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body.y = body.y + body.vy * dt
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end
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end
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