UnicodePlots: basic quiver and contour support

[t-bltg]

Basic quiver and contour support.

quiver (needs JuliaPlots/UnicodePlots.jl#198)

using Plots; unicodeplots()

main() = begin
  x = range(-2, 2, length=8)
  y = range(-1, 1, length=4)

  X = repeat(x, outer = [1, length(y)])'
  Y = repeat(y, outer = [1, length(x)])

  U = .2(X + Y)
  V = .2(Y - X)

  quiver(X[:], Y[:], quiver=(U[:], V[:])) |> display
  return
end

main()

contour (needs JuliaPlots/UnicodePlots.jl#204)

using Plots; unicodeplots()

main() = begin
  x = 1:.5:20
  y = 1:.5:10
  f(x, y) = (3x + y ^ 2) * abs(sin(x) + cos(y))

  X = repeat(x', length(y), 1)
  Y = repeat(y, 1, length(x))
  z = collect(map(f, X, Y))

  contour(x, y, z, c=:grays) |> display
  return
end

main()

Example application on a 2D lid driven cavity problem:

[codecov]

Codecov Report

Merging #4031 (6afc454) into master (3313780) will increase coverage by 0.09%.
The diff coverage is 63.15%.

@@            Coverage Diff             @@
##           master    #4031      +/-   ##
==========================================
+ Coverage   62.02%   62.11%   +0.09%     
==========================================
  Files          29       29              
  Lines        7258     7286      +28     
==========================================
+ Hits         4502     4526      +24     
- Misses       2756     2760       +4     

Impacted Files	Coverage Δ
src/backends.jl	64.60% <ø> (ø)
src/examples.jl	61.76% <ø> (ø)
src/backends/unicodeplots.jl	51.06% <63.15%> (+1.88%)	⬆️
src/pipeline.jl	93.77% <0.00%> (-0.21%)	⬇️
src/backends/gr.jl	88.27% <0.00%> (ø)
src/layouts.jl	66.96% <0.00%> (+1.17%)	⬆️

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