Add font_size_multiplier

lib/initials/svg.rb

@@ -4,13 +4,15 @@ class SVG
 
     attr_reader :name, :colors, :limit, :shape, :size
 
-    def initialize(name, colors: 12, limit: 3, shape: :circle, size: 32)
+    def initialize(name, colors: 12, limit: 3, shape: :circle, size: 32, font_size_multiplier: 1.0)
       @name = name.to_s.strip
       @colors = colors
       @limit = limit
       @shape = shape
       @size = size
+      @font_size_multiplier = font_size_multiplier
 
+      raise Initials::Error.new("Font size multiplier must be a number between 0 and 2, was: #{@font_size_multiplier}") unless valid_font_size_multiplier?
       raise Initials::Error.new("Colors must be a divider of 360 e.g. 24 but not 16.") unless valid_colors?
       raise Initials::Error.new("Size is not a positive integer.") unless valid_size?
     end
@@ -51,7 +53,8 @@ def fill
     end
 
     def font_size
-      size/2 + size/16 - (initials.length * size/16)
+      default_font_size = size/2 + size/16 - (initials.length * size/16)
+      (@font_size_multiplier * default_font_size).round
     end
 
     def initials
@@ -60,6 +63,10 @@ def initials
 
     private
 
+    def valid_font_size_multiplier?
+      (0..2) === @font_size_multiplier
+    end
+
     def valid_colors?
       return false unless colors.respond_to?(:to_i)
       return false unless colors > 0
@@ -71,4 +78,4 @@ def valid_size?
       size.to_i > 0
     end
   end
-end
+end

spec/svg_spec.rb

@@ -103,6 +103,26 @@
         end
       end
     end
+
+    describe "font_size_multiplier" do
+      let(:options) { {font_size_multiplier: 1.5} }
+
+      it "changes SVG font-size" do
+        expect(subject.to_s).to match(/^<svg .*font-size: 21px.+<\/svg>/)
+      end
+
+      [-1, -0.01, nil, 2.1].each do |font_size_multiplier|
+        it "validates positive integer (#{font_size_multiplier} is invalid)" do
+          expect { described_class.new("Rick", font_size_multiplier: font_size_multiplier) }.to raise_error Initials::Error
+        end
+      end
+
+      [0.5, 1, 1.2].each do |font_size_multiplier|
+        it "validates positive integer (#{font_size_multiplier} is valid)" do
+          expect { described_class.new("Rick", font_size_multiplier: font_size_multiplier) }.not_to raise_error
+        end
+      end
+    end
   end
 
   describe "name handling" do