How do I create a color bar with the same height for each level?
Default scales rectangles according to the levels.
using CairoMakie
xs = LinRange(0, 20, 50)
ys = LinRange(0, 15, 50)
zs = [cos(x) * sin(y) for x in xs, y in ys]
fig = Figure()
ax, hm = contourf(fig[1, 1], xs, ys, zs,
colormap = :Spectral, levels = [0, 0.1, 0.2, 0.5, 1])
Colorbar(fig[1, 2], hm, ticks = [0, 0.1, 0.2, 0.5, 1])
save("a.png", fig)
This colorbar syntax should also work in Makie ColorSchemes · Plots
Try:
using CairoMakie
xs = LinRange(0, 20, 50)
ys = LinRange(0, 15, 50)
zs = [cos(x) * sin(y) for x in xs, y in ys]
fig = Figure()
ax, hm = contourf(fig[1, 1], xs, ys, zs,
colormap = :Spectral, levels = [0, 0.1, 0.2, 0.5, 1])
# this line has changed...
Colorbar(fig[1, 2]; colormap = cgrad(:Spectral, 5; categorical=true), limits=(0.0,1.0), ticks = 0.1:0.2:0.9, tickformat= (x->string.([0,0.1,0.3,0.4,1])))
save("a.png", fig)
When passing a contour plot to Colorbar it automatically places the ticks and values according to it - and in this case, not exactly as desired. The call in the above call bypasses this default by calling ColorBar directly and specifying more parameters.
Thanks for the advice.
Based on your advice, I was able to do what I wanted to do with the following code.
using CairoMakie
xs = LinRange(0, 20, 50)
ys = LinRange(0, 15, 50)
zs = [cos(x) * sin(y) for x in xs, y in ys]
fig = Figure()
ax, hm = contourf(fig[1, 1], xs, ys, zs,
colormap = :Spectral, levels = [0, 0.1, 0.2, 0.5, 1])
Colorbar(fig[1, 2]; colormap = cgrad(:Spectral, 4; categorical=true), limits=(0.0,1.0), ticks = 0.0:0.25:1.0, tickformat= (x->string.([0,0.1,0.2,0.5,1])))
save("a.png", fig)
