fix plotting of set vectors

src/Plotting/plot_recipes.jl

@@ -20,8 +20,6 @@ function _extract_limits(p::RecipesBase.AbstractPlot,
         lims[:x] = :auto
         lims[:y] = :auto
     end
-    lims[:x_explicit] = RecipesBase.is_explicit(plotattributes, :xlims)
-    lims[:y_explicit] = RecipesBase.is_explicit(plotattributes, :ylims)
 
     # check whether the current call to `plot`/`plot!` passed new bounds
     if haskey(plotattributes, :xlims)
@@ -57,26 +55,20 @@ function _update_plot_limits!(lims, X::LazySet)
 
     box_min = low(box)
     box_max = high(box)
-    for (idx, symbols) in enumerate(((:x, :x_explicit), (:y, :y_explicit)))
-        symbol, symbol_explicit = symbols
-        if lims[symbol] != :auto || !lims[symbol_explicit]
-            if lims[symbol] == :auto
-                Δmax = box_max[idx]
-                Δmin = box_min[idx]
-            else
-                # width of the plotting window including the new set in the `symbol` direction
-                Δmax = max(lims[symbol][2], box_max[idx])
-                Δmin = min(lims[symbol][1], box_min[idx])
-            end
-            width = Δmax - Δmin
+    for (idx, symbol) in enumerate((:x, :y))
+        if lims[symbol] != :auto
+            # width of the plotting window including the new set in the `symbol` direction
+            dmin = min(lims[symbol][1], box_min[idx])
+            dmax = max(lims[symbol][2], box_max[idx])
+            width = dmax - dmin
 
             # scaling factor for beautification
-            ϵ = 0.05
+            ϵ = 0.03
             offset = width * ϵ
 
             # extend the current plot limits if the new set (plus a small offset) falls outside
-            lims[symbol] = (min(Δmin, box_min[idx] - offset),
-                            max(Δmax, box_max[idx] + offset))
+            lims[symbol] = (min(lims[symbol][1], box_min[idx] - offset),
+                            max(lims[symbol][2], box_max[idx] + offset))
         end
     end
     return nothing
@@ -534,8 +526,8 @@ end
     extr = _extract_extrema(p)
     if isbounded(cup)
         B = box_approximation(cup)
-        extr[:x] = (max(extr[:x][1], low(B, 1)), min(extr[:x][2], high(B, 1)))
-        extr[:y] = (max(extr[:y][1], low(B, 2)), min(extr[:y][2], high(B, 2)))
+        extr[:x] = (min(extr[:x][1], low(B, 1)), max(extr[:x][2], high(B, 1)))
+        extr[:y] = (min(extr[:y][1], low(B, 2)), max(extr[:y][2], high(B, 2)))
     end
     # if there is already a plotted set and the limits are fixed,
     # automatically adjust the axis limits (e.g. after plotting an