70 lines
1.6 KiB
Lua
70 lines
1.6 KiB
Lua
pal()
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cls()
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ball_count = 16
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max_radius = 16
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function _init()
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pal({9,10,11,12,13,2,15,136,137,138,139,140,141,130,143,8},1)
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balls = {}
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collisions = {}
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for i=1,ball_count do
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add(balls, ball:new({
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pos=vec2:new(rnd(127),rnd(127)),
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vel=vec2:new(rnd(2)-1,rnd(2)-1):normal(),
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rad = i < max_radius and i or max_radius,
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}))
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end
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end
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function _update60()
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for b in all(balls) do
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b:move()
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b:edge_bounce()
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end
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for b in all(balls) do
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b:check_collisions(balls)
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end
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handle_collisions(balls)
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collisions = {}
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end
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function _draw()
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-- cls()
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for b in all(balls) do
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b:draw(true)
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end
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end
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function handle_collisions()
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for source,colls in pairs(collisions) do
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for target,diff in pairs(colls) do
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local n = diff:normal()
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local steps = 0
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local rewind = 0
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local s_xpoint = source.pos
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local t_xpoint = target.pos
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repeat
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steps += 1
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rewind = 0.1 * steps
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s_xpoint = source.pos - source.vel * rewind
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t_xpoint = target.pos - target.vel * rewind
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until rewind > 1 or #(s_xpoint - t_xpoint) >= source.rad + target.rad
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local s_newvel = collision_vel(s_xpoint, source.vel, t_xpoint, target.vel, source:mass(), target:mass())
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local t_newvel = collision_vel(t_xpoint, target.vel, s_xpoint, source.vel, target:mass(), source:mass())
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source.pos = s_xpoint + source.vel * rewind
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target.pos = t_xpoint + target.vel * rewind
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source.vel = s_newvel
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target.vel = t_newvel
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end
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end
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end
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function collision_vel(x1,v1,x2,v2,m1,m2)
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m1 = m1 or 1
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m2 = m2 or 1
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local x_diff = x1 - x2
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local v_diff = v1 - v2
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return v1 - x_diff * (2 * m2 / (m1 + m2)) * v_diff:dot(x_diff) / (#x_diff)^2
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end
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