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Diffstat (limited to 'worldedit/primitives.lua')
| -rw-r--r-- | worldedit/primitives.lua | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/worldedit/primitives.lua b/worldedit/primitives.lua new file mode 100644 index 0000000..962a02f --- /dev/null +++ b/worldedit/primitives.lua @@ -0,0 +1,273 @@ +--- Functions for creating primitive shapes.
+-- @module worldedit.primitives
+
+local mh = worldedit.manip_helpers
+
+
+--- Adds a sphere of `node_name` centered at `pos`.
+-- @param pos Position to center sphere at.
+-- @param radius Sphere radius.
+-- @param node_name Name of node to make shere of.
+-- @param hollow Whether the sphere should be hollow.
+-- @return The number of nodes added.
+function worldedit.sphere(pos, radius, node_name, hollow)
+ local manip, area = mh.init_radius(pos, radius)
+
+ local data = mh.get_empty_data(area)
+
+ -- Fill selected area with node
+ local node_id = minetest.get_content_id(node_name)
+ local min_radius, max_radius = radius * (radius - 1), radius * (radius + 1)
+ local offset_x, offset_y, offset_z = pos.x - area.MinEdge.x, pos.y - area.MinEdge.y, pos.z - area.MinEdge.z
+ local stride_z, stride_y = area.zstride, area.ystride
+ local count = 0
+ for z = -radius, radius do
+ -- Offset contributed by z plus 1 to make it 1-indexed
+ local new_z = (z + offset_z) * stride_z + 1
+ for y = -radius, radius do
+ local new_y = new_z + (y + offset_y) * stride_y
+ for x = -radius, radius do
+ local squared = x * x + y * y + z * z
+ if squared <= max_radius and (not hollow or squared >= min_radius) then
+ -- Position is on surface of sphere
+ local i = new_y + (x + offset_x)
+ data[i] = node_id
+ count = count + 1
+ end
+ end
+ end
+ end
+
+ mh.finish(manip, data)
+
+ return count
+end
+
+
+--- Adds a dome.
+-- @param pos Position to center dome at.
+-- @param radius Dome radius. Negative for concave domes.
+-- @param node_name Name of node to make dome of.
+-- @param hollow Whether the dome should be hollow.
+-- @return The number of nodes added.
+-- TODO: Add axis option.
+function worldedit.dome(pos, radius, node_name, hollow)
+ local min_y, max_y = 0, radius
+ if radius < 0 then
+ radius = -radius
+ min_y, max_y = -radius, 0
+ end
+
+ local manip, area = mh.init_axis_radius(pos, "y", radius)
+ local data = mh.get_empty_data(area)
+
+ -- Add dome
+ local node_id = minetest.get_content_id(node_name)
+ local min_radius, max_radius = radius * (radius - 1), radius * (radius + 1)
+ local offset_x, offset_y, offset_z = pos.x - area.MinEdge.x, pos.y - area.MinEdge.y, pos.z - area.MinEdge.z
+ local stride_z, stride_y = area.zstride, area.ystride
+ local count = 0
+ for z = -radius, radius do
+ local new_z = (z + offset_z) * stride_z + 1 --offset contributed by z plus 1 to make it 1-indexed
+ for y = min_y, max_y do
+ local new_y = new_z + (y + offset_y) * stride_y
+ for x = -radius, radius do
+ local squared = x * x + y * y + z * z
+ if squared <= max_radius and (not hollow or squared >= min_radius) then
+ -- Position is in dome
+ local i = new_y + (x + offset_x)
+ data[i] = node_id
+ count = count + 1
+ end
+ end
+ end
+ end
+
+ mh.finish(manip, data)
+
+ return count
+end
+
+--- Adds a cylinder.
+-- @param pos Position to center base of cylinder at.
+-- @param axis Axis ("x", "y", or "z")
+-- @param length Cylinder length.
+-- @param radius Cylinder radius.
+-- @param node_name Name of node to make cylinder of.
+-- @param hollow Whether the cylinder should be hollow.
+-- @return The number of nodes added.
+function worldedit.cylinder(pos, axis, length, radius, node_name, hollow)
+ local other1, other2 = worldedit.get_axis_others(axis)
+
+ -- Handle negative lengths
+ local current_pos = {x=pos.x, y=pos.y, z=pos.z}
+ if length < 0 then
+ length = -length
+ current_pos[axis] = current_pos[axis] - length
+ end
+
+ -- Set up voxel manipulator
+ local manip, area = mh.init_axis_radius_length(current_pos, axis, radius, length)
+ local data = mh.get_empty_data(area)
+
+ -- Add cylinder
+ local node_id = minetest.get_content_id(node_name)
+ local min_radius, max_radius = radius * (radius - 1), radius * (radius + 1)
+ local stride = {x=1, y=area.ystride, z=area.zstride}
+ local offset = {
+ x = current_pos.x - area.MinEdge.x,
+ y = current_pos.y - area.MinEdge.y,
+ z = current_pos.z - area.MinEdge.z,
+ }
+ local min_slice, max_slice = offset[axis], offset[axis] + length - 1
+ local count = 0
+ for index2 = -radius, radius do
+ -- Offset contributed by other axis 1 plus 1 to make it 1-indexed
+ local new_index2 = (index2 + offset[other1]) * stride[other1] + 1
+ for index3 = -radius, radius do
+ local new_index3 = new_index2 + (index3 + offset[other2]) * stride[other2]
+ local squared = index2 * index2 + index3 * index3
+ if squared <= max_radius and (not hollow or squared >= min_radius) then
+ -- Position is in cylinder
+ -- Add column along axis
+ for index1 = min_slice, max_slice do
+ local vi = new_index3 + index1 * stride[axis]
+ data[vi] = node_id
+ end
+ count = count + length
+ end
+ end
+ end
+
+ mh.finish(manip, data)
+
+ return count
+end
+
+
+--- Adds a pyramid.
+-- @param pos Position to center base of pyramid at.
+-- @param axis Axis ("x", "y", or "z")
+-- @param height Pyramid height.
+-- @param node_name Name of node to make pyramid of.
+-- @return The number of nodes added.
+function worldedit.pyramid(pos, axis, height, node_name)
+ local other1, other2 = worldedit.get_axis_others(axis)
+
+ -- Set up voxel manipulator
+ local manip, area = mh.init_axis_radius(pos, axis,
+ height >= 0 and height or -height)
+ local data = mh.get_empty_data(area)
+
+ -- Handle inverted pyramids
+ local start_axis, end_axis, step
+ if height > 0 then
+ height = height - 1
+ step = 1
+ else
+ height = height + 1
+ step = -1
+ end
+
+ -- Add pyramid
+ local node_id = minetest.get_content_id(node_name)
+ local stride = {x=1, y=area.ystride, z=area.zstride}
+ local offset = {
+ x = pos.x - area.MinEdge.x,
+ y = pos.y - area.MinEdge.y,
+ z = pos.z - area.MinEdge.z,
+ }
+ local size = math.abs(height * step)
+ local count = 0
+ -- For each level of the pyramid
+ for index1 = 0, height, step do
+ -- Offset contributed by axis plus 1 to make it 1-indexed
+ local new_index1 = (index1 + offset[axis]) * stride[axis] + 1
+ for index2 = -size, size do
+ local new_index2 = new_index1 + (index2 + offset[other1]) * stride[other1]
+ for index3 = -size, size do
+ local i = new_index2 + (index3 + offset[other2]) * stride[other2]
+ data[i] = node_id
+ end
+ end
+ count = count + (size * 2 + 1) ^ 2
+ size = size - 1
+ end
+
+ mh.finish(manip, data)
+
+ return count
+end
+
+--- Adds a spiral.
+-- @param pos Position to center spiral at.
+-- @param length Spral length.
+-- @param height Spiral height.
+-- @param spacer Space between walls.
+-- @param node_name Name of node to make spiral of.
+-- @return Number of nodes added.
+-- TODO: Add axis option.
+function worldedit.spiral(pos, length, height, spacer, node_name)
+ local extent = math.ceil(length / 2)
+
+ local manip, area = mh.init_axis_radius_length(pos, "y", extent, height)
+ local data = mh.get_empty_data(area)
+
+ -- Set up variables
+ local node_id = minetest.get_content_id(node_name)
+ local stride = {x=1, y=area.ystride, z=area.zstride}
+ local offset_x, offset_y, offset_z = pos.x - area.MinEdge.x, pos.y - area.MinEdge.y, pos.z - area.MinEdge.z
+ local i = offset_z * stride.z + offset_y * stride.y + offset_x + 1
+
+ -- Add first column
+ local count = height
+ local column = i
+ for y = 1, height do
+ data[column] = node_id
+ column = column + stride.y
+ end
+
+ -- Add spiral segments
+ local stride_axis, stride_other = stride.x, stride.z
+ local sign = -1
+ local segment_length = 0
+ spacer = spacer + 1
+ -- Go through each segment except the last
+ for segment = 1, math.floor(length / spacer) * 2 do
+ -- Change sign and length every other turn starting with the first
+ if segment % 2 == 1 then
+ sign = -sign
+ segment_length = segment_length + spacer
+ end
+ -- Fill segment
+ for index = 1, segment_length do
+ -- Move along the direction of the segment
+ i = i + stride_axis * sign
+ local column = i
+ -- Add column
+ for y = 1, height do
+ data[column] = node_id
+ column = column + stride.y
+ end
+ end
+ count = count + segment_length * height
+ stride_axis, stride_other = stride_other, stride_axis -- Swap axes
+ end
+
+ -- Add shorter final segment
+ sign = -sign
+ for index = 1, segment_length do
+ i = i + stride_axis * sign
+ local column = i
+ -- Add column
+ for y = 1, height do
+ data[column] = node_id
+ column = column + stride.y
+ end
+ end
+ count = count + segment_length * height
+
+ mh.finish(manip, data)
+
+ return count
+end
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