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--- Scales the defined region down by the given scale factor in the given directions.
-- @param pos1 Vector Position 1 of the defined region,
-- @param pos2 Vector Position 2 of the defined region.
-- @param scale Vector The scale factor - as a vector - by which to scale down.
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-- @param anchor Vector The direction to scale in - as a vector. e.g. { x = -1, y = 1, z = -1 } would mean scale in the negative x, positive y, and nevative z directions.
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-- @return boolean, string|table Whether the operation was successful or not. If not, then an error messagea as a string is also passed. If it was, then a statistics object is returned instead.
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function worldeditadditions . scale_up ( pos1 , pos2 , scale , anchor )
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pos1 , pos2 = worldedit.sort_pos ( pos1 , pos2 )
if ( scale.x < 1 and scale.x > - 1 ) and ( scale.y < 1 and scale.y > - 1 ) and ( scale.z < 1 and scale.z > - 1 ) then
return false , " Error: Scale factor vectors may not mix values -1 < factor < 1 and (1 < factor or factor < -1) - in other words, you can't scale both up and down at the same time (try worldeditadditions.scale, which automatically applies such scale factor vectors as 2 successive operations) "
end
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if anchor.x == 0 or anchor.y == 0 or anchor.z == 0 then
return false , " Error: One of the components of the anchor vector was 0 (anchor components should either be greater than or less than 0 to indicate the anchor to scale in.) "
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end
local size = vector.subtract ( pos2 , pos1 )
local pos1_big = vector.new ( pos1 )
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local pos2_big = vector.new ( pos2 )
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if anchor.x < 1 then pos1_big.x = pos1_big.x - size.x
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else pos2_big.x = pos2_big.x + size.x end
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if anchor.y < 1 then pos1_big.y = pos1_big.y - size.y
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else pos2_big.y = pos2_big.y + size.y end
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if anchor.z < 1 then pos1_big.z = pos1_big.z - size.z
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else pos2_big.z = pos2_big.z + size.z end
local manip_small , area_small = worldedit.manip_helpers . init ( pos1 , pos2 )
local manip_big , area_big = worldedit.manip_helpers . init ( pos1_big , pos2_big )
local data_source = manip_small : get_data ( )
local data_target = manip_big : get_data ( )
local node_id_air = minetest.get_content_id ( " air " )
local kern_volume = math.abs ( scale.x ) * math.abs ( scale.y ) * math.abs ( scale.z )
local changes = { updated = 0 , scale = " scale_up " }
for z = pos2.z , pos1.z , - 1 do
for y = pos2.y , pos1.y , - 1 do
for x = pos2.x , pos1.x , - 1 do
local posi_rel = vector.subtract ( { x = x , y = y , z = z } , pos1 )
local kern_anchor = vector.add (
pos1_big ,
vector.cross (
vector.add ( posi_rel , 1 ) ,
scale
)
)
local source_val = data_source [ area_small : index ( x , y , z ) ]
for kz = kern_anchor.z , kern_anchor.z - scale.z , - 1 do
for ky = kern_anchor.y , kern_anchor.y - scale.y , - 1 do
for kx = kern_anchor.x , kern_anchor.x - scale.x , - 1 do
data_target [ area_big : index ( kx , ky , kz ) ] = source_val
end
end
end
changes.updated = changes.updated + kern_volume
end
end
end
-- Save the region back to disk & return
worldedit.manip_helpers . finish ( manip_big , data_target )
return true , changes
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end