[WIP] new shrinking #23
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| Original file line number | Diff line number | Diff line change |
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| module CompressUDG | ||
| using Graphs | ||
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| export UNode, contract_graph, CompressUDGMethod | ||
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| struct UNode | ||
| vertex::Int # vertex index in original graph | ||
| pos::Tuple{Int, Int} | ||
| neighbors::Vector{Int} | ||
| end | ||
| function Base.:(==)(x::UNode, y::UNode) | ||
| x.vertex == y.vertex && x.neighbors == y.neighbors | ||
| end | ||
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| # get surrounding neighbor points on UDG | ||
| function get_udg_neighbors(pos::Tuple{Int, Int}) | ||
| p_x, p_y = pos | ||
| pos_udg_neighbors = Vector{Tuple{Int, Int}}() | ||
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| for i = -1:1, j = -1:1 | ||
| !(i == 0 && j == 0) && push!(pos_udg_neighbors, (p_x + i, p_y + j)) | ||
| end | ||
| return pos_udg_neighbors | ||
| end | ||
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| # find UDNode given a position; return nothing if no node at that position | ||
| function get_UNode_from_pos(pos::Tuple{Int, Int}, node_list::Vector{UNode}) | ||
| for u in node_list | ||
| (u.pos == pos) && return u | ||
| end | ||
| return nothing | ||
| end | ||
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| # find boundaries of grid graph given list of UNodes | ||
| function find_boundaries(node_list::Vector{UNode}) | ||
| min_x = typemax(Int) | ||
| min_y = typemax(Int) | ||
| max_x = 0 | ||
| max_y = 0 | ||
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| for u in node_list | ||
| p_x, p_y = u.pos | ||
| (p_x > max_x) && (max_x = p_x) | ||
| (p_x < min_x) && (min_x = p_x) | ||
| (p_y > max_y) && (max_y = p_y) | ||
| (p_y < min_y) && (min_y = p_y) | ||
| end | ||
| return min_x, min_y, max_x, max_y | ||
| end | ||
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| # find points on the boundary that can be moved | ||
| function find_boundary_points(node_list::Vector{UNode}, x_min, x_max, y_min, y_max) | ||
| pts_boundary = Vector{UNode}() | ||
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| for u in node_list | ||
| p_x, p_y = u.pos | ||
| (p_x == x_min || p_x == x_max || p_y == y_min || p_y == y_max) && push!(pts_boundary, u) | ||
| end | ||
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| return pts_boundary | ||
| end | ||
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| # check that the new position of node n satisfies UDG requirements | ||
| function check_UDG_criteria(n::UNode, new_pos::Tuple{Int, Int}, | ||
| node_list::Vector{UNode}) | ||
| # check if new_pos is already occupied | ||
| (get_UNode_from_pos(new_pos, node_list) != nothing) && return false | ||
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| p_x, p_y = new_pos | ||
| new_neighbors = Vector{Int}() | ||
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| for p in get_udg_neighbors(new_pos) | ||
| unode = get_UNode_from_pos(p, node_list) | ||
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| if (unode !== nothing) && (unode.vertex != n.vertex) | ||
| push!(new_neighbors, unode.vertex) | ||
| end | ||
| end | ||
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| (issetequal(new_neighbors, n.neighbors) == true) && return true | ||
| return false | ||
| end | ||
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| # move node n to a new position new_pos | ||
| function move_node(n::UNode, node_list::Vector{UNode}, candidates::Vector{Tuple{Int, Int}}) | ||
| for p in candidates | ||
| if check_UDG_criteria(n, p, node_list) | ||
| node_list[n.vertex] = UNode(n.vertex, p, n.neighbors) | ||
| return node_list | ||
| end | ||
| end | ||
| return node_list | ||
| end | ||
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| # determine candidates to move | ||
| function determine_candidates(pos::Tuple{Int, Int}, x_min, x_max, y_min, y_max) | ||
| p_x, p_y = pos | ||
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| halfx = (x_max - x_min)/2 + x_min | ||
| halfy = (y_max - y_min)/2 + y_min | ||
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| # move boundary vertices such that we can shrink graph from four quadrants | ||
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There was a problem hiding this comment. Good! Now it is much easier to read. If possible, you should try to lessen the number of branches - otherwise you need to write tests for every branch to ensure the test coverage is good. |
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| (p_x == x_min && p_y >= halfy) && return [(p_x + 1, p_y), (p_x + 1, p_y - 1), (p_x, p_y - 1)] | ||
| (p_x == x_min && p_y < halfy) && return [(p_x + 1, p_y), (p_x + 1, p_y + 1), (p_x, p_y + 1)] | ||
| (p_x == x_max && p_y >= halfy) && return [(p_x - 1, p_y), (p_x - 1, p_y - 1), (p_x, p_y - 1)] | ||
| (p_x == x_max && p_y < halfy) && return [(p_x - 1, p_y), (p_x - 1, p_y + 1), (p_x, p_y + 1)] | ||
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| (p_x < halfx && p_y == y_min) && return [(p_x, p_y + 1), (p_x + 1, p_y + 1), (p_x + 1, p_y)] | ||
| (p_x >= halfx && p_y == y_min) && return [(p_x, p_y + 1), (p_x - 1, p_y + 1), (p_x - 1, p_y)] | ||
| (p_x < halfx && p_y == y_max) && return [(p_x, p_y - 1), (p_x + 1, p_y - 1), (p_x + 1, p_y)] | ||
| (p_x >= halfx && p_y == y_max) && return [(p_x, p_y - 1), (p_x - 1, p_y - 1), (p_x - 1, p_y)] | ||
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| end | ||
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| # one shrinking step | ||
| function greedy_step(node_list::Vector{UNode}, min_x::Int, max_x::Int, | ||
| min_y::Int, max_y::Int) | ||
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| boundary_pts = find_boundary_points(node_list, min_x, max_x, | ||
| min_y, max_y) | ||
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| for p in boundary_pts | ||
| node_list = move_node(p, node_list, determine_candidates(p.pos, min_x, max_x, | ||
| min_y, max_y)) | ||
| end | ||
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| return node_list | ||
| end | ||
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| function unitdisk_graph(locs::AbstractVector, unit::Real) | ||
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| n = length(locs) | ||
| g = SimpleGraph(n) | ||
| for i=1:n, j=i+1:n | ||
| if sum(abs2, locs[i] .- locs[j]) < unit ^ 2 | ||
| add_edge!(g, i, j) | ||
| end | ||
| end | ||
| return g | ||
| end | ||
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| # interfaces | ||
| abstract type CompressUDGMethod end | ||
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| """ | ||
| contract_graph(locs::Vector{Tuple{Int, Int}}) | ||
| Compute a contracted version of input graph node positions and returns a | ||
| corresponding layout of new condensed graph | ||
| """ | ||
| function contract_graph(node_positions::Vector{Tuple{Int, Int}}) | ||
| # initiate UNodes | ||
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| n_list = Vector{UNode}(undef, size(node_positions)[1]) | ||
| g = unitdisk_graph(node_positions, 1.5) | ||
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| for (ind, n_pos) in enumerate(node_positions) | ||
| n_list[ind] = UNode(ind, n_pos, neighbors(g, ind)) | ||
| end | ||
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| xmin, ymin, xmax, ymax = find_boundaries(n_list) | ||
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| while (xmax - xmin > 1) && (ymax - ymin > 1) | ||
| n_list = greedy_step(n_list, xmin, xmax, ymin, ymax) | ||
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| if xmin < xmax | ||
| xmin += 1 | ||
| xmax -= 1 | ||
| end | ||
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| if ymin < ymax | ||
| ymin += 1 | ||
| ymax -= 1 | ||
| end | ||
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| end | ||
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| locs_new = Vector{Tuple{Int, Int}}(undef, size(node_positions)[1]) | ||
| for (ind, un) in enumerate(n_list) | ||
| locs_new[ind] = un.pos | ||
| end | ||
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| return locs_new | ||
| end | ||
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| end | ||
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| using .CompressUDG | ||
| export UNode, contract_graph, CompressUDGMethod | ||
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Wanted an estimate of overhead scaling, can delete/modify function