cairo_context_wrapper.rb in squib-0.7.0

- old
+ new
@@ -1,53 +1,99 @@
-require 'forwardable'
-require 'squib/graphics/gradient_regex'
-
-module Squib
-  module Graphics
-    # Wrapper class for the Cairo context. Private.
-    # @api private
-    class CairoContextWrapper
-      extend Forwardable
-
-      # :nodoc:
-      # @api private
-      attr_accessor :cairo_cxt
-
-      # :nodoc:
-      # @api private
-      def initialize(cairo_cxt)
-        @cairo_cxt = cairo_cxt
-      end
-
-      def_delegators :cairo_cxt, :save, :set_source_color, :paint, :restore,
-        :translate, :rotate, :move_to, :update_pango_layout, :width, :height,
-        :show_pango_layout, :rounded_rectangle, :set_line_width, :stroke, :fill,
-        :set_source, :scale, :render_rsvg_handle, :circle, :triangle, :line_to,
-        :operator=, :show_page, :clip, :transform, :mask, :create_pango_layout,
-        :antialias=, :curve_to, :matrix, :matrix=, :identity_matrix, :pango_layout_path,
-        :stroke_preserve, :target, :new_path, :fill_preserve, :close_path
-
-      # :nodoc:
-      # @api private
-      def set_source_squibcolor(arg)
-        if match = arg.match(LINEAR_GRADIENT)
-          x1, y1, x2, y2 = match.captures
-          linear = Cairo::LinearPattern.new(x1.to_f, y1.to_f, x2.to_f, y2.to_f)
-          arg.scan(STOPS).each do |color, offset|
-            linear.add_color_stop(offset.to_f, color)
-          end
-          @cairo_cxt.set_source(linear)
-        elsif match = arg.match(RADIAL_GRADIENT)
-          x1, y1, r1, x2, y2, r2  = match.captures
-          linear = Cairo::RadialPattern.new(x1.to_f, y1.to_f, r1.to_f,
-                                            x2.to_f, y2.to_f, r2.to_f)
-          arg.scan(STOPS).each do |color, offset|
-            linear.add_color_stop(offset.to_f, color)
-          end
-          @cairo_cxt.set_source(linear)
-        else
-          @cairo_cxt.set_source_color(arg)
-        end
-      end
-    end
-  end
-end
\ No newline at end of file
+require 'forwardable'
+require 'squib/graphics/gradient_regex'
+
+module Squib
+  module Graphics
+    # Wrapper class for the Cairo context. Private.
+    # @api private
+    class CairoContextWrapper
+      extend Forwardable
+
+      # :nodoc:
+      # @api private
+      attr_accessor :cairo_cxt
+
+      # :nodoc:
+      # @api private
+      def initialize(cairo_cxt)
+        @cairo_cxt = cairo_cxt
+      end
+
+      def_delegators :cairo_cxt, :save, :set_source_color, :paint, :restore,
+        :translate, :rotate, :move_to, :update_pango_layout, :width, :height,
+        :show_pango_layout, :rounded_rectangle, :set_line_width, :stroke, :fill,
+        :set_source, :scale, :render_rsvg_handle, :circle, :triangle, :line_to,
+        :operator=, :show_page, :clip, :transform, :mask, :create_pango_layout,
+        :antialias=, :curve_to, :matrix, :matrix=, :identity_matrix, :pango_layout_path,
+        :stroke_preserve, :target, :new_path, :fill_preserve, :close_path,
+        :set_line_join, :set_line_cap, :set_dash
+
+      # :nodoc:
+      # @api private
+      def set_source_squibcolor(arg)
+        raise 'nil is not a valid color' if arg.nil?
+        if match = arg.match(LINEAR_GRADIENT)
+          x1, y1, x2, y2 = match.captures
+          linear = Cairo::LinearPattern.new(x1.to_f, y1.to_f, x2.to_f, y2.to_f)
+          arg.scan(STOPS).each do |color, offset|
+            linear.add_color_stop(offset.to_f, color)
+          end
+          @cairo_cxt.set_source(linear)
+        elsif match = arg.match(RADIAL_GRADIENT)
+          x1, y1, r1, x2, y2, r2  = match.captures
+          linear = Cairo::RadialPattern.new(x1.to_f, y1.to_f, r1.to_f,
+                                            x2.to_f, y2.to_f, r2.to_f)
+          arg.scan(STOPS).each do |color, offset|
+            linear.add_color_stop(offset.to_f, color)
+          end
+          @cairo_cxt.set_source(linear)
+        else
+          @cairo_cxt.set_source_color(arg)
+        end
+      end
+
+      # Convenience method for a common task
+      # @api private
+      def fill_n_stroke(draw)
+        return stroke_n_fill(draw) if draw.stroke_strategy == :stroke_first
+        set_source_squibcolor draw.fill_color
+        fill_preserve
+        set_source_squibcolor draw.stroke_color
+        set_line_width draw.stroke_width
+        set_line_join draw.join
+        set_line_cap draw.cap
+        set_dash draw.dash
+        stroke
+      end
+
+      def stroke_n_fill(draw)
+        return fill_n_stroke(draw) if draw.stroke_strategy == :fill_first
+        set_source_squibcolor draw.stroke_color
+        set_line_width draw.stroke_width
+        set_line_join draw.join
+        set_line_cap draw.cap
+        set_dash draw.dash
+        stroke_preserve
+        set_source_squibcolor draw.fill_color
+        fill
+      end
+
+      # Convenience method for a common task
+      # @api private
+      def fancy_stroke(draw)
+        set_source_squibcolor draw.stroke_color
+        set_line_width draw.stroke_width
+        set_line_join draw.join
+        set_line_cap draw.cap
+        set_dash draw.dash
+        stroke
+      end
+
+      def rotate_about(x, y, angle)
+        translate(x, y)
+        rotate(angle)
+        translate(-x, -y)
+      end
+
+    end
+  end
+end