Enhance graphics

src/library/analysis/visualization/model_density.jl

@@ -10,17 +10,34 @@ function ModelDensityPlot(model::Any)
     return ModelDensityPlot(backend(model))
 end
 
+function _model_density_ticks(
+    n::Integer,
+    p::Integer = (n <= 16) ? n : 8,
+)
+    if n <= p
+        return collect(Int, 1:n)
+    else
+        k = round(Int, n / p)
+
+        return [1;(k+1):k:(n-k);n]
+    end
+end
+
 @recipe function plot(plt::ModelDensityPlot{V,T,U,M}) where {V,T,U,M}
     title      --> "Model Density"
     color      --> :balance
     xlabel     --> "Variable Index"
     ylabel     --> "Variable Index"
-    margin     --> (0.5, :cm)
     fontfamily --> "Computer Modern"
 
+    top_margin    --> ( 0, :px)
+    bottom_margin --> ( 0, :px)
+    left_margin   --> (20, :px)
+    right_margin  --> (20, :px)
+
     n, L, Q, α = form(plt.model, :dense)
 
-    t = collect(1:(n÷10+1):n)
+    t = _model_density_ticks(n)
     z = α * (Symmetric(Q / 2) + diagm(L))
 
     Γ = maximum(abs.(z))
@@ -32,6 +49,8 @@ end
     xmirror      := true
     seriestype   := :heatmap
     aspect_ratio := :equal
+    framestyle   := :grid
+    size         := (505, 500)
 
     return (1:n, 1:n, collect(z))
 end