Merging turing-logo-graphics repository (#120)

* port logo codes

* update docstring

* add acknowledgement

* update url

* Default branch rename

---------

Co-authored-by: Kai Xu <xukai921110@gmail.com>
Co-authored-by: Penelope Yong <penelopeysm@gmail.com>

Author: 3 people

turing-logo-graphics/.gitignore

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+.DS_Store
+Manifest.toml

turing-logo-graphics/Project.toml

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+[deps]
+Colors = "5ae59095-9a9b-59fe-a467-6f913c188581"
+Distributions = "31c24e10-a181-5473-b8eb-7969acd0382f"
+Luxor = "ae8d54c2-7ccd-5906-9d76-62fc9837b5bc"
+Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"

turing-logo-graphics/README.md

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+## Turing logo graphics
+
+![Turing logo text](images/logo-text-small.png) ![Turing logo text dark](images/logo-text-dark-small.png)
+
+![Turing logo](images/logo-medium.png)

turing-logo-graphics/font/TamilMN-Bold.ttf

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+using Luxor
+using Luxor: julia_blue
+
+function getloc(tpath, idx)
+    xpoint = 0
+    ypoint = Inf
+    xpoint = polycentroid(tpath[idx]).x
+    for t in tpath
+        cpos = polycentroid(t)
+        (cpos.y < ypoint) && (ypoint = cpos.y)
+    end
+    return xpoint, ypoint
+end
+
+function find_i_index(txt)
+    i = 0
+    for c in txt
+        if c in (
+            'a', 'b', 'c', 'd', 'e',
+            'f', 'g', 'h',
+            'k', 'l', 'm', 'n', 'o', 
+            'p', 'q', 'r', 's', 't', 
+            'u', 'v', 'w', 'x', 'y',
+            'z',
+            'A', 'B', 'C', 'D', 'E',
+            'F', 'G', 'H', 'I', 'J',
+            'K', 'L', 'M', 'N', 'O',
+            'P', 'Q', 'R', 'S', 'T',
+            'U', 'V', 'W', 'X', 'Y', 
+            'Z',
+        )
+            i += 1
+        elseif c == 'j'
+            i += 2
+        elseif c == 'i'
+            return i + 1
+        else
+            @error "Unsupoorted character \"$c\""
+        end
+    end
+    @error "No \"i\" in the given text \"$txt\""
+end
+            
+"""
+Create a Julia style logo for the
+given text which contains an "i".
+
+Example:
+```julia
+textlogo("Turing")
+```
+![](https://github.com/TuringLang/turing-logo-graphics/raw/main/images/logo-text-small.png)
+
+Acknowledgement for https://github.com/JuliaGraphics/Luxor.jl/issues/78#issuecomment-570317514
+"""
+function textlogo(
+    txt::String;
+    ff::String="TamilMN-Bold",  # TamilMN-Bold is the font Julia's logo
+    fs::Int=50,                 # font size
+    xshift=( fs / 6),           # shifts for x
+    yshift=(-fs / 6),           # and y axes to move Julia circles
+    is_dark::Bool=false,        # dark mode or not
+    is_firstblue::Bool=false,   # to draw a transparent blue on the first letter or not
+    is_overlapred=true,         # to overlap red or purple?
+    filename="$(lowercase(txt))-logo.svg"
+)
+    @assert !('c' in txt) "No \"i\" in the given text \"$txt\""
+    ratio, wratio = fs / 50, length(txt) / 6
+    radius = fs / 5
+    for suffix in ("png", "svg")
+        drawing = Drawing(180 * ratio * wratio, 80 * ratio, "$filename.$suffix")
+        
+        translate(5 * ratio * wratio, 65 * ratio)
+        fontface(ff)
+        fontsize(fs)
+        if is_dark
+            background("black")
+            sethue("white")
+        else
+            background("white")
+            sethue("black")
+        end
+            
+        text(txt)
+        textoutlines(txt, O, :path)
+        tpath = pathtopoly()
+        
+        # Red, green and purple circles
+        xpoint, ypoint = getloc(tpath, find_i_index(txt))
+        if is_overlapred
+            xtrans, ytrans = xpoint + xshift, ypoint + yshift
+        else
+            xtrans, ytrans = xpoint + xshift, ypoint + yshift
+        end
+        translate( xtrans,  ytrans)
+        juliacircles(radius)
+        translate(-xtrans, -ytrans)
+            
+        # Blue circle
+        if is_firstblue
+            xpoint, ypoint = getloc(tpath, 1)
+            translate(xpoint - xshift, ypoint)
+            p = ngon(O, radius, 1, pi/6, vertices=true)[1]
+            setcolor((julia_blue..., 0.5))
+            circle(p, 2 * radius, :fill)
+        end
+        
+        finish()
+    end
+    preview()
+end
+
+turinglogo(; kwargs...) = textlogo("Turing"; kwargs...)
+    
+turinglogo(; filename=joinpath(@__DIR__, "../images/logo-text-small"),  fs=50)
+turinglogo(; filename=joinpath(@__DIR__, "../images/logo-text-medium"), fs=100)
+turinglogo(; filename=joinpath(@__DIR__, "../images/logo-text-large"),  fs=200)
+
+turinglogo(; filename=joinpath(@__DIR__, "../images/logo-text-dark-small"),  fs=50,  is_dark=true)
+turinglogo(; filename=joinpath(@__DIR__, "../images/logo-text-dark-medium"), fs=100, is_dark=true)
+turinglogo(; filename=joinpath(@__DIR__, "../images/logo-text-dark-large"),  fs=200, is_dark=true)

turing-logo-graphics/images/logo-large.png

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+using Distributions, Plots, Colors
+
+# Gaussian with known variance
+# mu ~ Normal(mu0, sig0)
+# xi ~ Normal(mu, sig_like)
+# Ref: https://en.wikipedia.org/wiki/Conjugate_prior#Continuous_distributions
+function get_posterior_parameters(xs, mu0, sig0, siglike)
+    n = length(xs)
+    var = inv(1 / sig0^2 + n / siglike^2)
+    mu = var * (mu0 / sig0^2 + sum(xs) / siglike^2)
+    return mu, sqrt(var)
+end
+
+function turinglogo(filename::String; figsize=(450, 300))
+    default(size=figsize, leg=false)
+
+    mu0, sig0, siglike = 0.0, 1.0, 1.0
+    prior = Normal(mu0, sig0)
+    # Inference with one datum
+    obs = [5.0]
+    post1 = Normal(get_posterior_parameters(obs, mu0, sig0, siglike)...)
+    # Inference with more data
+    push!(obs, 1.0)
+    post2 = Normal(get_posterior_parameters(obs, mu0, sig0, siglike)...)
+
+    julia_purple = parse(Colorant, RGBA(0.702, 0.322, 0.8))
+    julia_brown  = parse(Colorant, RGBA(0.8, 0.2, 0.2))
+    julia_green  = parse(Colorant, RGBA(0.133, 0.541, 0.133))
+
+    xs = -3:0.01:5
+    lw = 15.0
+    fig = plot(xs,  pdf.(Ref(prior), xs), color=julia_purple, linewidth=lw, grid=false)
+    plot!(xs, pdf.(Ref(post1), xs), color=julia_brown,  linewidth=lw)
+    plot!(xs, pdf.(Ref(post2), xs), color=julia_green,  linewidth=lw)
+    xaxis!(false)
+    yaxis!(false)
+
+    display(fig)
+
+    for suffix in ("png", "svg")
+        savefig(joinpath(@__DIR__, "$filename.$suffix"))
+    end
+end
+
+turinglogo("../images/logo-small";  figsize=(450, 300))
+turinglogo("../images/logo-medium"; figsize=(600, 400))
+turinglogo("../images/logo-large";  figsize=(750, 500))