cormullion

#!/usr/bin/env julia

using Luxor, Colors

function julia_balls()
  # get centers for the three balls
  points = reverse(ngon(0, 0, 100, 3, pi/6, vertices=true))
  gsave()
  #  setcolor(0.251, 0.388, 0.847)   # the darker blue not used
  #  setcolor(0.4, 0.51, 0.878)      # the lighter blue not used

cormullion

#!/usr/bin/env julia

using Luxor, Colors

function julia_balls()
  # get centers for the three balls
  points = reverse(ngon(0, 0, 100, 3, pi/6, vertices=true))
  gsave()
  #  setcolor(0.251, 0.388, 0.847)   # the darker blue not used
  #  setcolor(0.4, 0.51, 0.878)      # the lighter blue not used

cormullion

#!/usr/bin/env julia

using Luxor, Colors

Drawing(600, 500, "/tmp/stackad.png")
origin()
background("white")

# background textifying, not for reading, fortunately
function background_text(str_array, fontsz, beginning::Point, ending::Point)

cormullion

#!/usr/bin/env julia

using Luxor

Drawing(500, 500, "/tmp/julia-flowers.png")
background("white")

function juliaflowers(cpos::Point, radius; petals=30, outercircleratio=0.75, innercircleratio=0.65)
    # clockwise, from bottom LEFT...
    points3 = ngon(cpos, radius, 3, pi/6, vertices=true)

cormullion

#!/usr/bin/env julia

using Luxor

function pidigits(n)
    result = Int[]
    k, a::BigInt, b::BigInt, a1::BigInt, b1::BigInt = 2, 4, 1, 12, 4
    while n > 0
        p, q, k = k * k, 2k + 1, k + 1
        a, b, a1, b1 = a1, b1, p * a + q * a1, p * b + q * b1

cormullion

using Luxor

function three_circles(cpos::Point, circle_radius; outercircleratio=0.75, innercircleratio=0.65)
    fontface("Georgia-Bold")
    fontsize(26)
    # clockwise, from bottom LEFT...
    points3 = ngon(cpos, circle_radius, 3, pi/6, vertices=true)
    for (n, p) in enumerate(points3)
        sethue(color_sequence[n][1]...)
        circle(p, outercircleratio * circle_radius, :fill)

cormullion

using Luxor

function drawcell(centerpos, width, height, colornumber; hollow=false)
    darker_purple    = (0.584, 0.345, 0.698)
    lighter_purple   = (0.667, 0.475, 0.757)
    darker_green     = (0.22, 0.596, 0.149)
    lighter_green    = (0.376, 0.678, 0.318)
    darker_red       = (0.796, 0.235, 0.2)
    lighter_red      = (0.835, 0.388, 0.361)
    color_sequence   = [(darker_red, lighter_red),

cormullion

#!/usr/bin/env julia

# inspired by http://stackoverflow.com/questions/40031913/simulate-a-bouncing-ball
# and the inspired Chris Rackauckas

using DifferentialEquations, ParameterizedFunctions, NLsolve, Luxor

f = @ode_def BallBounce begin
  dy =  v
  dv = -g

cormullion

#!/usr/bin/env julia

using Luxor, Colors

"make a color more white"
function whiten(col::Color, f=0.5)
    hsl = convert(HSL, col)
    h, s, l = hsl.h, hsl.s, hsl.l
    return convert(RGB, HSL(h, f, f))
end

cormullion

#!/usr/bin/env julia

using Luxor

function makerandomepitrochoid(n)
    hlist = []
    plist = []
    for i in 1:n
        R = 20
        r = rand(30:3:91)