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Fix off-by-one error in piston length calculation and change the node pushing to make use of the fact that minetest.env:place_node() is apparently a no-op if the node is not air or liquid.

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This commit is contained in:
Anthony Zhang
2012-07-20 22:15:49 -04:00
parent 9736b0f61e
commit aa8ad0fde9
1 changed files with 21 additions and 15 deletions
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36
mesecons_pistons/init.lua
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@@ -115,28 +115,34 @@ mesecon:register_on_signal_on(function(pos, node)
--determine the number of nodes that need to be pushed
local count = 0
local checkpos = {x=pos.x, y=pos.y, z=pos.z} --first node being pushed
local checknode = minetest.env:get_node(checkpos)
while checknode.name ~= "air"
and checknode.name ~= "ignore"
and checknode.name ~= "default:water_source"
and checknode.name ~= "default:water_flowing"
and checknode.name ~= "default:lava_source"
and checknode.name ~= "default:lava_flowing" do
while true do
local checknode = minetest.env:get_node(checkpos)
--check for collision with stopper
if mesecon:is_mvps_stopper(checknode.name) then
return
end
--check for column end
if checknode.name == "air"
or checknode.name == "ignore"
or checknode.name == "default:water_source"
or checknode.name == "default:water_flowing"
or checknode.name == "default:lava_source"
or checknode.name == "default:lava_flowing" then
break
end
--limit piston pushing capacity
count = count + 1
if count > 15 then
return
end
--check for collision with stopper
checknode = minetest.env:get_node(checkpos)
if mesecon:is_mvps_stopper(checknode.name) then
return
end
checkpos.x, checkpos.y, checkpos.z = checkpos.x + dir.x, checkpos.y + dir.y, checkpos.z + dir.z
end
checknode = minetest.env:get_node(pos)
local checknode = minetest.env:get_node(pos)
minetest.env:dig_node(pos) --remove the first node
--add pusher
@@ -148,11 +154,11 @@ mesecon:register_on_signal_on(function(pos, node)
--move nodes forward
for i = 1, count do
--move to the next node
pos.x, pos.y, pos.z = pos.x + dir.x, pos.y + dir.y, pos.z + dir.z
pos.x, pos.y, pos.z = pos.x + dir.x, pos.y + dir.y, pos.z + dir.z --move to the next node
--move the node forward
local nextnode = minetest.env:get_node(pos)
minetest.env:dig_node(pos)
minetest.env:place_node(pos, checknode)
checknode = nextnode
end