forked from VoxeLibre/VoxeLibre
Move code that handles below-rail hoppers to handle_cart_enter, implement timestep-independent cart physics (will need tuning punch, power rail and gravityaccelerations to make game fun)
This commit is contained in:
parent
0fa067d3ee
commit
0ef0ae6bee
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@ -21,7 +21,8 @@ local function mcl_log(message)
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end
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end
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local function handle_cart_enter(self,pos)
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local function handle_cart_enter(self, pos, next_dir)
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local staticdata = self._staticdata
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local node = minetest.get_node(pos)
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-- Handle track behaviors
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@ -30,11 +31,35 @@ local function handle_cart_enter(self,pos)
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node_def._mcl_minecarts_on_enter(pos, cart)
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end
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-- check for hopper under the rail
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local under_pos = pos - vector.new(0,1,0)
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local under_node_name = minetest.get_node(under_pos).name
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local under_node_def = minetest.registered_nodes[under_node_name]
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if under_node_def._mcl_minecarts_on_enter_above then
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under_node_def._mcl_minecarts_on_enter_above(under_pos, cart)
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else
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local hopper_pulled = false
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if DEBUG then print( "under_node_name="..under_node_name..", hopper="..tostring(under_node_def.groups.hopper)) end
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if under_node_def and under_node_def.groups.hopper ~= 0 then
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hopper_pulled = mcl_hoppers.pull_from_minecart( self, under_pos, self._inv_size or 0 )
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if DEBUG then print( "Attempt pull_from_minecart, hopper_pulled="..tostring(hopper_pulled) ) end
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if hopper_pulled and next_dir ~= staticdata.dir then
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-- If there was an item pulled by a hopper under the rails force the cart to stay put for 1.5 seconds
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-- to allow redstone time to process
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if hopper_pulled then
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staticdata.delay = 1.5
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end
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end
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end
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end
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-- Handle above-track behaviors (to ensure hoppers can transfer at least one item)
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local above_pos = pos + vector.new(0,1,0)
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local node = minetest.get_node(above_pos)
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if node_def._mcl_minecarts_on_enter_below then
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node_def._mcl_minecarts_on_enter_below(above_pos, cart)
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local above_node_name = minetest.get_node(above_pos).name
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local above_node_def = minetest.registered_nodes[above_node_name]
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if above_node_def._mcl_minecarts_on_enter_below then
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above_node_def._mcl_minecarts_on_enter_below(above_pos, cart)
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end
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-- Handle cart-specific behaviors
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@ -90,88 +115,12 @@ local function update_cart_orientation(self,staticdata)
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self.object:set_rotation(rot)
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end
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local function do_movement_step(self, remaining_distance)
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local staticdata = self._staticdata
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local pos = staticdata.connected_at
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if not pos then return remaining_distance end
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if staticdata.velocity < 0.1 then return remaining_distance end
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local remaining_in_block = 1 - ( staticdata.distance or 0 )
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local dinstance = 0
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if remaining_in_block > remaining_distance then
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distance = remaining_distance
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staticdata.distance = ( staticdata.distance or 0 ) + distance
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pos = pos + staticdata.dir * staticdata.distance
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else
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distance = remaining_in_block
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staticdata.distance = 0
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-- Leave the old node
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handle_cart_leave(pos)
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-- Anchor at the next node
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pos = pos + staticdata.dir
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staticdata.connected_at = pos
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-- Enter the new node
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handle_cart_enter(self, pos)
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-- check for hopper under the rail
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local under_pos = pos - vector.new(0,1,0)
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local under_node_name = minetest.get_node(under_pos).name
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local under_node_def = minetest.registered_nodes[under_node_name]
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local hopper_pulled = false
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if DEBUG then print( "under_node_name="..under_node_name..", hopper="..tostring(under_node_def.groups.hopper)) end
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if under_node_def and under_node_def.groups.hopper ~= 0 then
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hopper_pulled = mcl_hoppers.pull_from_minecart( self, under_pos, self._inv_size or 0 )
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if DEBUG then print( "Attempt pull_from_minecart, hopper_pulled="..tostring(hopper_pulled) ) end
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end
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-- Get the next direction
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local next_dir,_ = mcl_minecarts:get_rail_direction(pos, staticdata.dir, nil, nil, staticdata.railtype)
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if DEBUG and next_dir ~= staticdata.dir then
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print( "Changing direction from "..tostring(staticdata.dir).." to "..tostring(next_dir))
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end
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-- Handle end of track
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if next_dir == staticdata.dir * -1 and ( hopper_pulled or next_dir.y == 0 ) then
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if DEBUG then print("Stopping cart at "..tostring(pos)) end
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staticdata.velocity = 0
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-- If there is a hopper under here, force the cart to stay put for 1.5 seconds
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-- to allow redstone time to process
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if hopper_pulled then
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staticdata.delay = 1.5
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end
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distance = remaining_distance
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end
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-- Update cart direction
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staticdata.dir = next_dir
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end
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self.object:move_to(pos)
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-- Update cart orientation
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update_cart_orientation(self,staticdata)
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-- Report distance traveled
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return distance
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end
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local function process_acceleration(self, timestep)
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local staticdata = self._staticdata
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if not staticdata.connected_at then return end
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local function calculate_acceleration(self, staticdata)
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local acceleration = 0
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if DEBUG and staticdata.velocity > 0 then
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print( " acceleration="..tostring(acceleration)..",velocity="..tostring(staticdata.velocity)..
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",timestep="..tostring(timestep)..
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",dir="..tostring(staticdata.dir))
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-- Apply friction if moving
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if staticdata.velocity > 0 then
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acceleration = -friction
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end
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local pos = staticdata.connected_at
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@ -188,64 +137,218 @@ local function process_acceleration(self, timestep)
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elseif self._fueltime and self._fueltime > 0 then
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acceleration = 0.6
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elseif staticdata.velocity >= ( node_def._max_acceleration_velocity or max_vel ) then
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acceleration = 0
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-- Standard friction
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else
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acceleration = node_def._rail_acceleration or -friction
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acceleration = node_def._rail_acceleration or acceleration
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end
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if math.abs(acceleration) > (friction / 5) then
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-- Factor in gravity after everything else
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local gravity_strength = 9.8 --friction * 5
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if staticdata.dir.y < 0 then
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acceleration = gravity_strength - friction
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elseif staticdata.dir.y > 0 then
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acceleration = -gravity_strength + friction
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end
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return acceleration
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end
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local function do_movement_step(self, dtime)
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local staticdata = self._staticdata
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if not staticdata.connected_at then return 0 end
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-- Calculate timestep remaiing in this block
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local x_0 = staticdata.distance or 0
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local remaining_in_block = 1 - x_0
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local a = calculate_acceleration(self, staticdata)
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local v_0 = staticdata.velocity
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if DEBUG and ( v_0 > 0 or a ~= 0 ) then
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print( " cart #"..tostring(staticdata.cart_id)..
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": a="..tostring(a)..
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",v_0="..tostring(v_0)..
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",x_0="..tostring(x_0)..
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",timestep="..tostring(timestep)..
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",dir="..tostring(staticdata.dir)..
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",connected_at="..tostring(staticdata.connected_at)..
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",distance="..tostring(staticdata.distance)
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)
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end
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-- Not moving
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if a == 0 and v_0 == 0 then return 0 end
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-- Movement equation with acceleration: x_1 = x_0 + v_0 * t + 0.5 * a * t*t
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local timestep
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local stops_in_block = false
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local inside = v_0 * v_0 + 2 * a * remaining_in_block
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if inside < 0 then
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-- Would stop or reverse direction inside this block, calculate time to v_1 = 0
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timestep = -v_0 / a
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stops_in_block = true
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elseif a ~= 0 then
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-- Setting x_1 = x_0 + remaining_in_block, and solving for t gives:
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timestep = ( math.sqrt( v_0 * v_0 + 2 * a * remaining_in_block) - v_0 ) / a
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else
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timestep = remaining_in_block / v_0
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end
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-- Truncate timestep to remaining time delta
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if timestep > dtime then
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timestep = dtime
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end
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-- Truncate timestep to prevent v_1 from being larger that speed_max
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local v_max = mcl_minecarts.speed_max
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if v_0 + a * timestep > v_max then
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timestep = ( v_max - v_0 ) / a
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end
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-- Prevent infinite loops
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if timestep <= 0 then return 0 end
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-- Calculate v_1 taking v_max into account
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local v_1 = v_0 + a * timestep
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if v_1 > v_max then
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v_1 = v_max
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elseif v_1 < friction / 5 then
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v_1 = 0
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end
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-- Calculate x_1
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local x_1 = x_0 + timestep * v_0 + 0.5 * a * timestep * timestep
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-- Update position and velocity of the minecart
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staticdata.velocity = v_1
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staticdata.distance = x_1
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-- Entity movement
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local pos = staticdata.connected_at
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-- Handle movement to next block, account for loss of precision in calculations
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if x_1 >= 0.99 then
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staticdata.distance = 0
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-- Leave the old node
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handle_cart_leave(pos)
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-- Anchor at the next node
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pos = pos + staticdata.dir
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staticdata.connected_at = pos
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-- Get the next direction
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local next_dir,_ = mcl_minecarts:get_rail_direction(pos, staticdata.dir, nil, nil, staticdata.railtype)
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if DEBUG and next_dir ~= staticdata.dir then
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print( "Changing direction from "..tostring(staticdata.dir).." to "..tostring(next_dir))
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end
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-- Enter the new node
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handle_cart_enter(self, pos, next_dir)
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-- Handle end of track
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if next_dir == staticdata.dir * -1 and ( hopper_pulled or next_dir.y == 0 ) then
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if DEBUG then print("Stopping cart at end of track at "..tostring(pos)) end
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staticdata.velocity = 0
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end
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-- Update cart direction
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staticdata.dir = next_dir
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elseif stops_in_block and v_1 < (friction/5) and a <= 0 then
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-- Handle direction flip due to gravity
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if DEBUG then print("Gravity flipped direction") end
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-- Velocity should be zero at this point
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staticdata.velocity = 0
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-- Complete moving thru this block into the next, reverse direction, and put us back at the same position we were at
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local next_dir = -staticdata.dir
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pos = pos + staticdata.dir
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staticdata.distance = 1 - staticdata.distance
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staticdata.connected_at = pos
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-- recalculate direction
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local next_dir,_ = mcl_minecarts:get_rail_direction(pos + staticdata.dir, next_dir, nil, nil, staticdata.railtype)
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staticdata.dir = next_dir
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-- Intermediate movement
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pos = pos + staticdata.dir * staticdata.distance
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else
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-- Intermediate movement
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pos = pos + staticdata.dir * staticdata.distance
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end
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self.object:move_to(pos)
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-- Update cart orientation
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update_cart_orientation(self,staticdata)
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-- Debug reporting
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if DEBUG and ( v_0 > 0 or v_1 > 0 ) then
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print( " cart #"..tostring(staticdata.cart_id)..
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": a="..tostring(a)..
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",v_0="..tostring(v_0)..
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",v_1="..tostring(v_1)..
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",x_0="..tostring(x_0)..
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",x_1="..tostring(x_1)..
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",timestep="..tostring(timestep)..
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",dir="..tostring(staticdata.dir)..
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",pos="..tostring(pos)..
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",connected_at="..tostring(staticdata.connected_at)..
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",distance="..tostring(staticdata.distance)
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)
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end
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-- Report the amount of time processed
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return dtime - timestep
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--[[
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---Process acceleration
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local pos = staticdata.connected_at
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-- Apply acceleleration
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if math.abs(acceleration) > 0 then
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-- Apply simple acceleration
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staticdata.velocity = ( staticdata.velocity or 0 ) + acceleration * timestep
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-- Apply friction to resist direction of velocity
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if staticdata.velocity > 0 then
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staticdata.velocity = ( staticdata.velocity ) - friction * timestep
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-- Velocity flip due to friction should stop movement
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if staticdata.velocity < 0 then
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if DEBUG then print("Friction stopped minecart") end
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staticdata.velocity = 0
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end
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else
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end
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if staticdata.velocity > max_vel then
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staticdata.velocity = max_vel
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elseif staticdata.velocity < (friction/5) then
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if DEBUG then print("Stopping cart at "..tostring(pos)) end
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staticdata.velocity = 0
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end
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end
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-- Factor in gravity after everything else
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local gravity_accel = 0
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local gravity_strength = friction + 0.2
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if staticdata.dir.y < 0 then
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gravity_accel = gravity_strength
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elseif staticdata.dir.y > 0 then
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gravity_accel = -gravity_strength
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end
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if DEBUG and gravity_accel ~= 0 then
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print("gravity_accel="..tostring(gravity_accel))
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end
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if gravity_accel ~= 0 then
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staticdata.velocity = (staticdata.velocity or 0) + gravity_accel
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if staticdata.velocity < 0 then
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if DEBUG then
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print("Gravity flipped direction")
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end
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-- Complete moving thru this block into the next, reverse direction, and put us back at the same position we were at
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staticdata.velocity = staticdata.velocity * -1
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next_dir = -staticdata.dir
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pos = pos + staticdata.dir
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staticdata.distance = 1 - staticdata.distance
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staticdata.connected_at = pos
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local next_dir,_ = mcl_minecarts:get_rail_direction(pos + staticdata.dir, next_dir, nil, nil, staticdata.railtype)
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staticdata.dir = next_dir
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update_cart_orientation(self,staticdata)
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end
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end
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-- Force the cart to stop if moving slowly enough
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if (staticdata.velocity or 0) < 0.1 then
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if (staticdata.velocity or 0) < (friction/5) then
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staticdata.velocity = 0
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end
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if DEBUG and staticdata.velocity > 0 then
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print( " acceleration="..tostring(acceleration)..",velocity="..tostring(staticdata.velocity)..
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",timestep="..tostring(timestep)..
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",dir="..tostring(staticdata.dir))
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end
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-- Handle movement
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local pos = staticdata.connected_at
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if not pos then return remaining_distance end
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if staticdata.velocity < 0.1 then return remaining_distance end
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-- Report distance traveled
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return distance
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]]--
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end
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local function do_movement( self, dtime )
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local staticdata = self._staticdata
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@ -262,25 +365,11 @@ local function do_movement( self, dtime )
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staticdata.velocity = initial_velocity
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end
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-- Break long movements into fixed-size steps so that
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-- it is impossible to jump across gaps due to server lag
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-- Break long movements at block boundaries to make it
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-- it impossible to jump across gaps due to server lag
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-- causing large timesteps
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local total_distance = dtime * ( staticdata.velocity or 0 )
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local remaining_distance = total_distance
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process_acceleration(self,dtime * max_step_distance / total_distance)
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-- Skip processing stopped railcarts
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if not staticdata.velocity or math.abs(staticdata.velocity) < (friction/5) then
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return
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end
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while remaining_distance > 0.1 do
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local step_distance = do_movement_step(self, remaining_distance)
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if step_distance > 0.1 then
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process_acceleration(self, dtime * step_distance / total_distance)
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end
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remaining_distance = remaining_distance - step_distance
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while dtime > 0 do
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dtime = do_movement_step(self, dtime)
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end
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-- Clear punched flag now that movement for this step has been completed
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@ -457,6 +546,7 @@ local function make_staticdata( railtype, connected_at, dir )
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distance = 0,
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velocity = 0,
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dir = vector.new(dir),
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cart_id = math.random(1,1000000000),
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}
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end
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@ -641,6 +731,10 @@ local function register_entity(entity_id, def)
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function cart:on_step(dtime)
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hopper_take_item(self, dtime)
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local staticdata = self._staticdata
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-- Make sure all carts have an ID to isolate them
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staticdata.cart_id = staticdata.cart_id or math.random(1,1000000000)
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if not staticdata then
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staticdata = make_staticdata()
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self._staticdata = staticdata
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