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Edge label middle #8

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Merged
merged 4 commits into from
Jan 24, 2023
Merged

Edge label middle #8

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75ec07f
make edge label in center (even for direted)
hdavid16 Oct 13, 2022
9bb185c
.
hdavid16 Oct 13, 2022
3bafc1c
add interpolation functions for edge labels
hdavid16 Jan 24, 2023
d117fc2
fix #190
hdavid16 Jan 24, 2023
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16 changes: 16 additions & 0 deletions src/lines.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,22 @@ function midpoint(pt1,pt2)
return x,y
end

function interpolate_bezier(x::Vector,t)
n = length(x)-1
x_loc = sum(binomial(n,i)*(1-t)^(n-i)*t^i*x[i+1][1] for i in 0:n)
y_loc = sum(binomial(n,i)*(1-t)^(n-i)*t^i*x[i+1][2] for i in 0:n)
return x_loc.value, y_loc.value
end

interpolate_bezier(x::Compose.CurvePrimitive,t) =
interpolate_bezier([x.anchor0, x.ctrl0, x.ctrl1, x.anchor1], t)

function interpolate_line(locs_x,locs_y,i,j,t)
x_loc = locs_x[i] + (locs_x[j]-locs_x[i])*t
y_loc = locs_y[i] + (locs_y[j]-locs_y[i])*t
return x_loc, y_loc
end

function graphline(edge_list, locs_x, locs_y, nodesize::Vector{T}, arrowlength, angleoffset) where {T<:Real}
num_edges = length(edge_list)
lines = Array{Vector{Tuple{Float64,Float64}}}(undef, num_edges)
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38 changes: 22 additions & 16 deletions src/plot.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -223,22 +223,6 @@ function gplot(g::AbstractGraph{T},
text_locs_y .- nodesize .* (nodelabeldist * sin(nodelabelangleoffset)),
map(string, nodelabel), [hcenter], [vcenter])
end
# Create edge labels if provided
edgetexts = nothing
if !isempty(edgelabel)
edge_locs_x = zeros(R1, NE)
edge_locs_y = zeros(R2, NE)
for (e_idx, e) in enumerate(edges(g))
i = src(e)
j = dst(e)
mid_x = (locs_x[i]+locs_x[j]) / 2.0
mid_y = (locs_y[i]+locs_y[j]) / 2.0
edge_locs_x[e_idx] = (is_directed(g) ? (mid_x+locs_x[j]) / 2.0 : mid_x) + edgelabeldistx * NODESIZE
edge_locs_y[e_idx] = (is_directed(g) ? (mid_y+locs_y[j]) / 2.0 : mid_y) + edgelabeldisty * NODESIZE

end
edgetexts = text(edge_locs_x, edge_locs_y, map(string, edgelabel), [hcenter], [vcenter])
end

# Create lines and arrow heads
lines, larrows = nothing, nothing
Expand All @@ -251,6 +235,28 @@ function gplot(g::AbstractGraph{T},
lines, larrows = build_straight_edges(edges(g), locs_x, locs_y, nodesize, arrowlengthfrac, arrowangleoffset)
end

# Create edge labels if provided
edgetexts = nothing
if !isempty(edgelabel)
edge_locs_x = zeros(R1, NE)
edge_locs_y = zeros(R2, NE)
self_loop_idx = 1
for (e_idx, e) in enumerate(edges(g))
i, j = src(e), dst(e)
if linetype == "curve"
mid_x, mid_y = interpolate_bezier(curves.primitives[e_idx], 0.5)
elseif src(e) == dst(e)
mid_x, mid_y = interpolate_bezier(curves.primitives[self_loop_idx], 0.5)
self_loop_idx += 1
else
mid_x, mid_y = interpolate_line(locs_x,locs_y,i,j,0.5)
end
edge_locs_x[e_idx] = mid_x + edgelabeldistx * NODESIZE
edge_locs_y[e_idx] = mid_y + edgelabeldisty * NODESIZE
end
edgetexts = text(edge_locs_x, edge_locs_y, map(string, edgelabel), [hcenter], [vcenter])
end

# Set plot_size
if length(plot_size) != 2 || !isa(plot_size[1], Compose.AbsoluteLength) || !isa(plot_size[2], Compose.AbsoluteLength)
error("`plot_size` must be a Tuple of lengths")
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