Plots.jl/src/components.jl
2021-06-04 14:26:15 +02:00

780 lines
22 KiB
Julia

const P2 = GeometryBasics.Point2{Float64}
const P3 = GeometryBasics.Point3{Float64}
nanpush!(a::AbstractVector{P2}, b) = (push!(a, P2(NaN,NaN)); push!(a, b))
nanappend!(a::AbstractVector{P2}, b) = (push!(a, P2(NaN,NaN)); append!(a, b))
nanpush!(a::AbstractVector{P3}, b) = (push!(a, P3(NaN,NaN,NaN)); push!(a, b))
nanappend!(a::AbstractVector{P3}, b) = (push!(a, P3(NaN,NaN,NaN)); append!(a, b))
compute_angle(v::P2) = (angle = atan(v[2], v[1]); angle < 0 ? 2π - angle : angle)
# -------------------------------------------------------------
struct Shape{X<:Number, Y<:Number}
x::Vector{X}
y::Vector{Y}
# function Shape(x::AVec, y::AVec)
# # if x[1] != x[end] || y[1] != y[end]
# # new(vcat(x, x[1]), vcat(y, y[1]))
# # else
# new(x, y)
# end
# end
end
"""
Shape(x, y)
Shape(vertices)
Construct a polygon to be plotted
"""
Shape(verts::AVec) = Shape(RecipesPipeline.unzip(verts)...)
Shape(s::Shape) = deepcopy(s)
get_xs(shape::Shape) = shape.x
get_ys(shape::Shape) = shape.y
vertices(shape::Shape) = collect(zip(shape.x, shape.y))
#deprecated
@deprecate shape_coords coords
"return the vertex points from a Shape or Segments object"
function coords(shape::Shape)
shape.x, shape.y
end
#coords(shapes::AVec{Shape}) = unzip(map(coords, shapes))
function coords(shapes::AVec{<:Shape})
c = map(coords, shapes)
x = [q[1] for q in c]
y = [q[2] for q in c]
x, y
end
"get an array of tuples of points on a circle with radius `r`"
function partialcircle(start_θ, end_θ, n = 20, r=1)
[(r*cos(u), r*sin(u)) for u in range(start_θ, stop=end_θ, length=n)]
end
"interleave 2 vectors into each other (like a zipper's teeth)"
function weave(x,y; ordering = Vector[x,y])
ret = eltype(x)[]
done = false
while !done
for o in ordering
try
push!(ret, popfirst!(o))
catch
end
end
done = isempty(x) && isempty(y)
end
ret
end
"create a star by weaving together points from an outer and inner circle. `n` is the number of arms"
function makestar(n; offset = -0.5, radius = 1.0)
z1 = offset * π
z2 = z1 + π / (n)
outercircle = partialcircle(z1, z1 + 2π, n+1, radius)
innercircle = partialcircle(z2, z2 + 2π, n+1, 0.4radius)
Shape(weave(outercircle, innercircle))
end
"create a shape by picking points around the unit circle. `n` is the number of point/sides, `offset` is the starting angle"
function makeshape(n; offset = -0.5, radius = 1.0)
z = offset * π
Shape(partialcircle(z, z + 2π, n+1, radius))
end
function makecross(; offset = -0.5, radius = 1.0)
z2 = offset * π
z1 = z2 - π/8
outercircle = partialcircle(z1, z1 + 2π, 9, radius)
innercircle = partialcircle(z2, z2 + 2π, 5, 0.5radius)
Shape(weave(outercircle, innercircle,
ordering=Vector[outercircle,innercircle,outercircle]))
end
from_polar(angle, dist) = P2(dist*cos(angle), dist*sin(angle))
function makearrowhead(angle; h = 2.0, w = 0.4)
tip = from_polar(angle, h)
Shape(P2[(0,0), from_polar(angle - 0.5π, w) - tip,
from_polar(angle + 0.5π, w) - tip, (0,0)])
end
const _shapes = KW(
:circle => makeshape(20),
:rect => makeshape(4, offset=-0.25),
:diamond => makeshape(4),
:utriangle => makeshape(3, offset=0.5),
:dtriangle => makeshape(3, offset=-0.5),
:rtriangle => makeshape(3, offset=0.0),
:ltriangle => makeshape(3, offset=1.0),
:pentagon => makeshape(5),
:hexagon => makeshape(6),
:heptagon => makeshape(7),
:octagon => makeshape(8),
:cross => makecross(offset=-0.25),
:xcross => makecross(),
:vline => Shape([(0,1),(0,-1)]),
:hline => Shape([(1,0),(-1,0)]),
)
for n in [4,5,6,7,8]
_shapes[Symbol("star$n")] = makestar(n)
end
Shape(k::Symbol) = deepcopy(_shapes[k])
# -----------------------------------------------------------------------
# uses the centroid calculation from https://en.wikipedia.org/wiki/Centroid#Centroid_of_polygon
"return the centroid of a Shape"
function center(shape::Shape)
x, y = coords(shape)
n = length(x)
A, Cx, Cy = 0.0, 0.0, 0.0
for i=1:n
ip1 = i==n ? 1 : i+1
A += x[i] * y[ip1] - x[ip1] * y[i]
end
A *= 0.5
for i=1:n
ip1 = i==n ? 1 : i+1
m = (x[i] * y[ip1] - x[ip1] * y[i])
Cx += (x[i] + x[ip1]) * m
Cy += (y[i] + y[ip1]) * m
end
Cx / 6A, Cy / 6A
end
function scale!(shape::Shape, x::Real, y::Real = x, c = center(shape))
sx, sy = coords(shape)
cx, cy = c
for i=eachindex(sx)
sx[i] = (sx[i] - cx) * x + cx
sy[i] = (sy[i] - cy) * y + cy
end
shape
end
function scale(shape::Shape, x::Real, y::Real = x, c = center(shape))
shapecopy = deepcopy(shape)
scale!(shapecopy, x, y, c)
end
"translate a Shape in space"
function translate!(shape::Shape, x::Real, y::Real = x)
sx, sy = coords(shape)
for i=eachindex(sx)
sx[i] += x
sy[i] += y
end
shape
end
function translate(shape::Shape, x::Real, y::Real = x)
shapecopy = deepcopy(shape)
translate!(shapecopy, x, y)
end
function rotate_x(x::Real, y::Real, Θ::Real, centerx::Real, centery::Real)
(x - centerx) * cos(Θ) - (y - centery) * sin(Θ) + centerx
end
function rotate_y(x::Real, y::Real, Θ::Real, centerx::Real, centery::Real)
(y - centery) * cos(Θ) + (x - centerx) * sin(Θ) + centery
end
function rotate(x::Real, y::Real, θ::Real, c = center(shape))
cx, cy = c
rotate_x(x, y, Θ, cx, cy), rotate_y(x, y, Θ, cx, cy)
end
function rotate!(shape::Shape, Θ::Real, c = center(shape))
x, y = coords(shape)
cx, cy = c
for i=eachindex(x)
xi = rotate_x(x[i], y[i], Θ, cx, cy)
yi = rotate_y(x[i], y[i], Θ, cx, cy)
x[i], y[i] = xi, yi
end
shape
end
"rotate an object in space"
function rotate(shape::Shape, θ::Real, c = center(shape))
x, y = coords(shape)
cx, cy = c
x_new = rotate_x.(x, y, θ, cx, cy)
y_new = rotate_y.(x, y, θ, cx, cy)
Shape(x_new, y_new)
end
# -----------------------------------------------------------------------
mutable struct Font
family::AbstractString
pointsize::Int
halign::Symbol
valign::Symbol
rotation::Float64
color::Colorant
end
"""
font(args...)
Create a Font from a list of features. Values may be specified either as
arguments (which are distinguished by type/value) or as keyword arguments.
# Arguments
- `family`: AbstractString. "serif" or "sans-serif" or "monospace"
- `pointsize`: Integer. Size of font in points
- `halign`: Symbol. Horizontal alignment (:hcenter, :left, or :right)
- `valign`: Symbol. Vertical aligment (:vcenter, :top, or :bottom)
- `rotation`: Real. Angle of rotation for text in degrees (use a non-integer type)
- `color`: Colorant or Symbol
# Examples
```julia-repl
julia> font(8)
julia> font(family="serif",halign=:center,rotation=45.0)
```
"""
function font(args...;kw...)
# defaults
family = "sans-serif"
pointsize = 14
halign = :hcenter
valign = :vcenter
rotation = 0.0
color = colorant"black"
for arg in args
T = typeof(arg)
if T == Font
family = arg.family
pointsize = arg.pointsize
halign = arg.halign
valign = arg.valign
rotation = arg.rotation
color = arg.color
elseif arg == :center
halign = :hcenter
valign = :vcenter
elseif arg in (:hcenter, :left, :right)
halign = arg
elseif arg in (:vcenter, :top, :bottom)
valign = arg
elseif T <: Colorant
color = arg
elseif T <: Symbol || T <: AbstractString
try
color = parse(Colorant, string(arg))
catch
family = string(arg)
end
elseif typeof(arg) <: Integer
pointsize = arg
elseif typeof(arg) <: Real
rotation = convert(Float64, arg)
else
@warn("Unused font arg: $arg ($(typeof(arg)))")
end
end
for symbol in keys(kw)
if symbol == :family
family = string(kw[:family])
elseif symbol == :pointsize
pointsize = kw[:pointsize]
elseif symbol == :halign
halign = kw[:halign]
if halign == :center
halign = :hcenter
end
@assert halign in (:hcenter, :left, :right)
elseif symbol == :valign
valign = kw[:valign]
if valign == :center
valign = :vcenter
end
@assert valign in (:vcenter, :top, :bottom)
elseif symbol == :rotation
rotation = kw[:rotation]
elseif symbol == :color
color = parse(Colorant, kw[:color])
else
@warn("Unused font kwarg: $symbol")
end
end
Font(family, pointsize, halign, valign, rotation, color)
end
function scalefontsize(k::Symbol, factor::Number)
f = default(k)
f = round(Int, factor * f)
default(k, f)
end
"""
scalefontsizes(factor::Number)
Scales all **current** font sizes by `factor`. For example `scalefontsizes(1.1)` increases all current font sizes by 10%. To reset to initial sizes, use `scalefontsizes()`
"""
function scalefontsizes(factor::Number)
for k in (:titlefontsize, :legendfontsize, :legendtitlefontsize)
scalefontsize(k, factor)
end
for letter in (:x,:y,:z)
for k in (:guidefontsize, :tickfontsize)
scalefontsize(Symbol(letter, k), factor)
end
end
end
"""
scalefontsizes()
Resets font sizes to initial default values.
"""
function scalefontsizes()
for k in (:titlefontsize, :legendfontsize, :legendtitlefontsize)
f = default(k)
if k in keys(_initial_fontsizes)
factor = f / _initial_fontsizes[k]
scalefontsize(k, 1.0/factor)
end
end
for letter in (:x,:y,:z)
for k in (:guidefontsize, :tickfontsize)
if k in keys(_initial_fontsizes)
f = default(Symbol(letter, k))
factor = f / _initial_fontsizes[k]
scalefontsize(Symbol(letter, k), 1.0/factor)
end
end
end
end
resetfontsizes() = scalefontsizes()
"Wrap a string with font info"
struct PlotText
str::AbstractString
font::Font
end
PlotText(str) = PlotText(string(str), font())
"""
text(string, args...; kw...)
Create a PlotText object wrapping a string with font info, for plot annotations.
`args` and `kw` are passed to `font`.
"""
text(t::PlotText) = t
text(t::PlotText, font::Font) = PlotText(t.str, font)
text(str::AbstractString, f::Font) = PlotText(str, f)
function text(str, args...;kw...)
PlotText(string(str), font(args...;kw...))
end
Base.length(t::PlotText) = length(t.str)
# -----------------------------------------------------------------------
# -----------------------------------------------------------------------
struct Stroke
width
color
alpha
style
end
"""
stroke(args...; alpha = nothing)
Define the properties of the stroke used in plotting lines
"""
function stroke(args...; alpha = nothing)
width = 1
color = :black
style = :solid
for arg in args
T = typeof(arg)
# if arg in _allStyles
if allStyles(arg)
style = arg
elseif T <: Colorant
color = arg
elseif T <: Symbol || T <: AbstractString
try
color = parse(Colorant, string(arg))
catch
end
elseif allAlphas(arg)
alpha = arg
elseif allReals(arg)
width = arg
else
@warn("Unused stroke arg: $arg ($(typeof(arg)))")
end
end
Stroke(width, color, alpha, style)
end
struct Brush
size # fillrange, markersize, or any other sizey attribute
color
alpha
end
function brush(args...; alpha = nothing)
size = 1
color = :black
for arg in args
T = typeof(arg)
if T <: Colorant
color = arg
elseif T <: Symbol || T <: AbstractString
try
color = parse(Colorant, string(arg))
catch
end
elseif allAlphas(arg)
alpha = arg
elseif allReals(arg)
size = arg
else
@warn("Unused brush arg: $arg ($(typeof(arg)))")
end
end
Brush(size, color, alpha)
end
# -----------------------------------------------------------------------
mutable struct SeriesAnnotations
strs::AbstractVector # the labels/names
font::Font
baseshape::Union{Shape, AbstractVector{Shape}, Nothing}
scalefactor::Tuple
end
function series_annotations(strs::AbstractVector, args...)
fnt = font()
shp = nothing
scalefactor = (1,1)
for arg in args
if isa(arg, Shape) || (isa(arg, AbstractVector) && eltype(arg) == Shape)
shp = arg
elseif isa(arg, Font)
fnt = arg
elseif isa(arg, Symbol) && haskey(_shapes, arg)
shp = _shapes[arg]
elseif isa(arg, Number)
scalefactor = (arg,arg)
elseif is_2tuple(arg)
scalefactor = arg
else
@warn("Unused SeriesAnnotations arg: $arg ($(typeof(arg)))")
end
end
# if scalefactor != 1
# for s in get(shp)
# scale!(s, scalefactor, scalefactor, (0,0))
# end
# end
SeriesAnnotations(strs, fnt, shp, scalefactor)
end
series_annotations(anns::SeriesAnnotations) = anns
series_annotations(::Nothing) = nothing
function series_annotations_shapes!(series::Series, scaletype::Symbol = :pixels)
anns = series[:series_annotations]
# msw,msh = anns.scalefactor
# ms = series[:markersize]
# msw,msh = if isa(ms, AbstractVector)
# 1,1
# elseif is_2tuple(ms)
# ms
# else
# ms,ms
# end
# @show msw msh
if anns !== nothing && anns.baseshape !== nothing
# we use baseshape to overwrite the markershape attribute
# with a list of custom shapes for each
msw,msh = anns.scalefactor
msize = Float64[]
shapes = Vector{Shape}(undef, length(anns.strs))
for i in eachindex(anns.strs)
str = _cycle(anns.strs,i)
# get the width and height of the string (in mm)
sw, sh = text_size(str, anns.font.pointsize)
# how much to scale the base shape?
# note: it's a rough assumption that the shape fills the unit box [-1,-1,1,1],
# so we scale the length-2 shape by 1/2 the total length
scalar = (backend() == PyPlotBackend() ? 1.7 : 1.0)
xscale = 0.5to_pixels(sw) * scalar
yscale = 0.5to_pixels(sh) * scalar
# we save the size of the larger direction to the markersize list,
# and then re-scale a copy of baseshape to match the w/h ratio
maxscale = max(xscale, yscale)
push!(msize, maxscale)
baseshape = _cycle(anns.baseshape, i)
shapes[i] = scale(baseshape, msw*xscale/maxscale, msh*yscale/maxscale, (0,0))
end
series[:markershape] = shapes
series[:markersize] = msize
end
return
end
mutable struct EachAnn
anns
x
y
end
function Base.iterate(ea::EachAnn, i = 1)
if ea.anns === nothing || isempty(ea.anns.strs) || i > length(ea.y)
return nothing
end
tmp = _cycle(ea.anns.strs,i)
str,fnt = if isa(tmp, PlotText)
tmp.str, tmp.font
else
tmp, ea.anns.font
end
((_cycle(ea.x,i), _cycle(ea.y,i), str, fnt), i+1)
end
annotations(::Nothing) = []
annotations(anns::AVec) = anns
annotations(anns) = Any[anns]
annotations(sa::SeriesAnnotations) = sa
# Expand arrays of coordinates, positions and labels into induvidual annotations
# and make sure labels are of type PlotText
function process_annotation(sp::Subplot, xs, ys, labs, font = nothing)
anns = []
labs = makevec(labs)
xlength = length(methods(length, (typeof(xs),))) == 0 ? 1 : length(xs)
ylength = length(methods(length, (typeof(ys),))) == 0 ? 1 : length(ys)
if isnothing(font)
font = Plots.font(;
family=sp[:annotationfontfamily],
pointsize=sp[:annotationfontsize],
halign=sp[:annotationhalign],
valign=sp[:annotationvalign],
rotation=sp[:annotationrotation],
color=sp[:annotationcolor],
)
end
for i in 1:max(xlength, ylength, length(labs))
x, y, lab = _cycle(xs, i), _cycle(ys, i), _cycle(labs, i)
x = typeof(x) <: TimeType ? Dates.value(x) : x
y = typeof(y) <: TimeType ? Dates.value(y) : y
if lab == :auto
alphabet = "abcdefghijklmnopqrstuvwxyz"
push!(anns, (x, y, text(string("(", alphabet[sp[:subplot_index]], ")"), font)))
else
push!(anns, (x, y, isa(lab, PlotText) ? lab : isa(lab, Tuple) ? text(lab[1], font, lab[2:end]...) : text(lab, font)))
end
end
anns
end
function process_annotation(sp::Subplot, positions::Union{AVec{Symbol},Symbol}, labs, font = nothing)
anns = []
positions, labs = makevec(positions), makevec(labs)
if isnothing(font)
font = Plots.font(;
family=sp[:annotationfontfamily],
pointsize=sp[:annotationfontsize],
halign=sp[:annotationhalign],
valign=sp[:annotationvalign],
rotation=sp[:annotationrotation],
color=sp[:annotationcolor],
)
end
for i in 1:max(length(positions), length(labs))
pos, lab = _cycle(positions, i), _cycle(labs, i)
pos = get(_positionAliases, pos, pos)
if lab == :auto
alphabet = "abcdefghijklmnopqrstuvwxyz"
push!(anns, (pos, text(string("(", alphabet[sp[:subplot_index]], ")"), font)))
else
push!(anns, (pos, isa(lab, PlotText) ? lab : isa(lab, Tuple) ? text(lab[1], font, lab[2:end]...) : text(lab, font)))
end
end
anns
end
function process_any_label(lab, font=Font())
lab isa Tuple ? text(lab...) : text( lab, font )
end
# Give each annotation coordinates based on specified position
function locate_annotation(sp::Subplot, pos::Symbol, lab::PlotText)
position_multiplier = Dict{Symbol, Tuple{Float64,Float64}}(
:topleft => (0.1, 0.9),
:topcenter => (0.5, 0.9),
:topright => (0.9, 0.9),
:bottomleft => (0.1, 0.1),
:bottomcenter => (0.5, 0.1),
:bottomright => (0.9, 0.1),
)
xmin, xmax = ignorenan_extrema(sp[:xaxis])
ymin, ymax = ignorenan_extrema(sp[:yaxis])
x, y = (xmin, ymin).+ position_multiplier[pos].* (xmax - xmin, ymax - ymin)
(x, y, lab)
end
locate_annotation(sp::Subplot, x, y, label::PlotText) = (x, y, label)
locate_annotation(sp::Subplot, x, y, z, label::PlotText) = (x, y, z, label)
# -----------------------------------------------------------------------
"type which represents z-values for colors and sizes (and anything else that might come up)"
struct ZValues
values::Vector{Float64}
zrange::Tuple{Float64,Float64}
end
function zvalues(values::AVec{T}, zrange::Tuple{T,T} = (ignorenan_minimum(values), ignorenan_maximum(values))) where T<:Real
ZValues(collect(float(values)), map(Float64, zrange))
end
# -----------------------------------------------------------------------
function expand_extrema!(a::Axis, surf::Surface)
ex = a[:extrema]
for vi in surf.surf
expand_extrema!(ex, vi)
end
ex
end
"For the case of representing a surface as a function of x/y... can possibly avoid allocations."
struct SurfaceFunction <: AbstractSurface
f::Function
end
# -----------------------------------------------------------------------
# # I don't want to clash with ValidatedNumerics, but this would be nice:
# ..(a::T, b::T) = (a,b)
# -----------------------------------------------------------------------
# style is :open or :closed (for now)
struct Arrow
style::Symbol
side::Symbol # :head (default), :tail, or :both
headlength::Float64
headwidth::Float64
end
"""
arrow(args...)
Define arrowheads to apply to lines - args are `style` (`:open` or `:closed`),
`side` (`:head`, `:tail` or `:both`), `headlength` and `headwidth`
"""
function arrow(args...)
style = :simple
side = :head
headlength = 0.3
headwidth = 0.3
setlength = false
for arg in args
T = typeof(arg)
if T == Symbol
if arg in (:head, :tail, :both)
side = arg
else
style = arg
end
elseif T <: Number
# first we apply to both, but if there's more, then only change width after the first number
headwidth = Float64(arg)
if !setlength
headlength = headwidth
end
setlength = true
elseif T <: Tuple && length(arg) == 2
headlength, headwidth = Float64(arg[1]), Float64(arg[2])
else
@warn("Skipped arrow arg $arg")
end
end
Arrow(style, side, headlength, headwidth)
end
# allow for do-block notation which gets called on every valid start/end pair which
# we need to draw an arrow
function add_arrows(func::Function, x::AVec, y::AVec)
for i=2:length(x)
xyprev = (x[i-1], y[i-1])
xy = (x[i], y[i])
if ok(xyprev) && ok(xy)
if i==length(x) || !ok(x[i+1], y[i+1])
# add the arrow from xyprev to xy
func(xyprev, xy)
end
end
end
end
# -----------------------------------------------------------------------
"create a BezierCurve for plotting"
mutable struct BezierCurve{T <: GeometryBasics.Point}
control_points::Vector{T}
end
function (bc::BezierCurve)(t::Real)
p = zero(P2)
n = length(bc.control_points)-1
for i in 0:n
p += bc.control_points[i+1] * binomial(n, i) * (1-t)^(n-i) * t^i
end
p
end
@deprecate curve_points coords
coords(curve::BezierCurve, n::Integer = 30; range = [0,1]) = map(curve, Base.range(first(range), stop=last(range), length=n))
# build a BezierCurve which leaves point p vertically upwards and arrives point q vertically upwards.
# may create a loop if necessary. Assumes the view is [0,1]
function directed_curve(args...; kw...)
error("directed_curve has been moved to PlotRecipes")
end
function extrema_plus_buffer(v, buffmult = 0.2)
vmin,vmax = ignorenan_extrema(v)
vdiff = vmax-vmin
buffer = vdiff * buffmult
vmin - buffer, vmax + buffer
end