Julia streamer logo

juliastreamer.jl

using Luxor, ColorSchemes

function sinecurveincreasing(thecurve, width=5.0; initialwidth=1, finalwidth=2)
    leftcurve  = Point[]
    rightcurve = Point[]
    
    for n in 1:length(thecurve)-1
        # find slope of curve at those points
        pt1 = Point(thecurve[n].x, cos(thecurve[n].y))
        
        # find normals normal is 1/slope
        slopept1 =  -1/(pt1.y/pt1.x)
        
        # find perpendiculars
        perp1 = perpendicular(thecurve[n], thecurve[mod1(n+1, length(thecurve))], -width)
        perp2 = perpendicular(thecurve[n], thecurve[mod1(n+1, length(thecurve))], width)
        
        push!(leftcurve, perp1)
        push!(rightcurve, perp2)
        width = rescale(n, 1, length(thecurve), initialwidth, finalwidth)
    end
    return vcat(leftcurve, reverse(rightcurve))
end

Drawing(500, 500, "juliastreamer.svg")
origin()
squircle(O, 240, 240, :clip, rt=0.1)
background("black")
rotate(pi/2)
thecurve = [Point(20 + 10x, 10sin(x)) for x in 0:pi/24:14pi]

for (n, i) in enumerate(0:pi/12:2pi)
    @layer begin
        rotate(i)
        sethue([Luxor.darker_red, Luxor.darker_purple, Luxor.darker_green][mod1(n, 3)])
        o = sinecurveincreasing(thecurve, .1, initialwidth=0.5, finalwidth=25)
        poly(o, :fill)
    end
end

squircle(O, 30, 30, :clip)
t = Table(2, 2, 50, 50)
for p in t
    sethue([Luxor.darker_red, Luxor.darker_purple, Luxor.darker_green, Luxor.darker_blue][mod1(p[2], 4)])
    box(p[1], t.colwidths[1], t.rowheights[1], :fill)
end
clipreset()

finish()
preview()
#run(`svgo juliastreamer.svg -o juliastreamer-min.svg`)