Add bookcover (and source files)

_quarto.yml

@@ -8,7 +8,7 @@ book:
   author: "Maarten Pronk, Rafael Schouten, Anshul Singhvi, Felix Cremer and Jakub Nowosad"
   description: |
     An introductory resource for working with geographic data in Julia
-  # cover-image: https://geocompx.org/static/img/book_cover_py_tmp_small.png
+  cover-image: cover/cover_small-fs8.png
   site-url: https://jl.geocompx.org
   repo-url: https://github.com/geocompx/geocompjl/
   repo-branch: main

cover/Project.toml

@@ -0,0 +1,4 @@
+[deps]
+ArchGDAL = "c9ce4bd3-c3d5-55b8-8973-c0e20141b8c3"
+GLMakie = "e9467ef8-e4e7-5192-8a1a-b1aee30e663a"
+Rasters = "a3a2b9e3-a471-40c9-b274-f788e487c689"

cover/README.md

@@ -0,0 +1,15 @@
+# Making the cover
+
+The cover is made as an A4 in Illustrator, with the title set in Tamil NM Bold 48pt, compressed by 40 to look like the Julia logo (https://github.com/JuliaLang/julia-logo-graphics?tab=readme-ov-file#construction-the-julia-language-logo). The logo is https://github.com/JuliaLang/julia-logo-graphics/blob/master/images/julia-logo-dark.svg.
+
+The graphic is made by running the `cover.jl` file. Specifically what we see is the CopernicusDEM elevation model around Prague (where this book was born), both as a surface, as its white contours. No GeoMakie is used.
+
+The author names are set in Montserrat 18pt.
+
+Finally the cover is exported as png, `pngquant` is run for compression.
+
+## Improvements
+- [ ] Ditch Illustrator
+- [ ] Fix labels intersecting ticks
+- [ ] Improve surface (maybe rotate to the right as well)
+

cover/cover.jl

@@ -0,0 +1,29 @@
+using GLMakie
+using Rasters
+using ArchGDAL
+dir = @__DIR__
+
+dem = Raster(joinpath(dir, "copdem_prague.tif"))
+
+GLMakie.activate!()
+GLMakie.activate!(ssao=true)
+
+GLMakie.closeall() # close any open screen
+
+x = lookup(dem, X) # if X is longitude
+y = lookup(dem, Y) # if Y is latitude
+zmin, zmax = minimum(dem), maximum(dem)
+cmap = :viridis
+
+set_theme!(theme_dark())
+# backgroundcolor is julia purple with blacks set to 80% to match Python cover
+fig = Figure(size=(2400, 2400), fontsize=22, backgroundcolor="#371135")
+ax = Axis3(fig[1, 1], aspect=:equal, perspectiveness=1, elevation=π / 5,
+    zgridcolor=:white, ygridcolor=:white, xgridcolor=:white, xlabel="Longitude", ylabel="Latitude")
+xlims!(ax, extrema(x)...)
+ylims!(ax, extrema(y)...)
+zlims!(ax, 0, zmax + 100)
+sm = surface!(ax, x, y, dem; colormap=cmap, colorrange=(zmin, zmax))
+contour!(ax, x, y, dem; levels=100, linewidth=0.1, color=:white,
+    colorrange=(zmin, zmax), transparency=true)
+save("test.png", ax.scene; px_per_unit=2)