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47 lines
1.3 KiB
Lua
47 lines
1.3 KiB
Lua
-- can be overridden by mods
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function core.calculate_knockback(player, hitter, time_from_last_punch, tool_capabilities, dir, distance, damage)
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if damage == 0 or player:get_armor_groups().immortal then
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return 0.0
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end
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local m = 8
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-- solve m - m*e^(k*4) = 4 for k
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local k = -0.17328
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local res = m - m * math.exp(k * damage)
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if distance < 2.0 then
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res = res * 1.1 -- more knockback when closer
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elseif distance > 4.0 then
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res = res * 0.9 -- less when far away
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end
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return res
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end
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local function vector_absmax(v)
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local max, abs = math.max, math.abs
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return max(max(abs(v.x), abs(v.y)), abs(v.z))
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end
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core.register_on_punchplayer(function(player, hitter, time_from_last_punch, tool_capabilities, unused_dir, damage)
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if player:get_hp() == 0 then
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return -- RIP
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end
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-- Server::handleCommand_Interact() adds eye offset to one but not the other
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-- so the direction is slightly off, calculate it ourselves
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local dir = vector.subtract(player:get_pos(), hitter:get_pos())
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local d = vector.length(dir)
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if d ~= 0.0 then
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dir = vector.divide(dir, d)
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end
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local k = core.calculate_knockback(player, hitter, time_from_last_punch, tool_capabilities, dir, d, damage)
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local kdir = vector.multiply(dir, k)
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if vector_absmax(kdir) < 1.0 then
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return -- barely noticeable, so don't even send
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end
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player:add_velocity(kdir)
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end)
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