fix bug in plotting systems with several rules (#30)

* fix bug in plotting systems with several rules

* update changelog

Author: lucaferranti

docs/src/changelog.md

@@ -6,6 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 - ![](https://img.shields.io/badge/new%20feature-green.svg) added semi-elliptic membership functions
 - ![](https://img.shields.io/badge/new%20feature-green.svg) added `gensurf` to plot generating surface
+- ![](https://img.shields.io/badge/bugfix-purple.svg) fix plotting of systems with several rules and membership functions.
 
 ## v0.1.2 -- 2023-03-12
 

src/plotting.jl

@@ -80,6 +80,7 @@ end
     nin = length(fis.inputs)
     nrules = length(fis.rules)
     layout := (nrules, nin + nout)
+    size --> (300 * (nin + nout), 200 * nrules)
     for rule in fis.rules
         ants = leaves(rule.antecedent)
         for (varname, var) in pairs(fis.inputs)

test/test_plotting.jl

@@ -89,10 +89,12 @@ end
         @test p.args == d
         if isempty(d)
             @test p.plotattributes == Dict(:plot_title => "tipper", :grid => false,
-                       :legend => false, :axis => false, :layout => (3, 3))
+                       :legend => false, :axis => false, :layout => (3, 3),
+                       :size => (900, 600))
         else
             @test p.plotattributes ==
-                  Dict(:plot_title => "tipper", :title => t, :layout => (3, 3))
+                  Dict(:plot_title => "tipper", :size => (900, 600), :title => t,
+                       :layout => (3, 3))
         end
     end
 end