Merge branch 'bezier'

lib/gruff.rb

@@ -6,6 +6,7 @@
   base
   area
   bar
+  bezier
   line
   dot
   pie

lib/gruff/bezier.rb

@@ -0,0 +1,54 @@
+
+require File.dirname(__FILE__) + '/base'
+
+class Gruff::Bezier < Gruff::Base
+
+  def draw
+    super
+
+    return unless @has_data
+
+    @x_increment = @graph_width / (@column_count - 1).to_f
+
+
+    @norm_data.each do |data_row|
+      poly_points = Array.new
+      prev_x = prev_y = 0.0
+      @d = @d.fill data_row[DATA_COLOR_INDEX]
+
+
+      data_row[1].each_with_index do |data_point, index|
+        # Use incremented x and scaled y
+        new_x = @graph_left + (@x_increment * index)
+        new_y = @graph_top + (@graph_height - data_point * @graph_height)
+
+        if prev_x >= 0 and prev_y >= 0 then
+          poly_points << new_x
+          poly_points << new_y
+
+        else
+          poly_points << @graph_left
+          poly_points << @graph_bottom - 1
+          poly_points << new_x
+          poly_points << new_y
+
+        end
+
+        draw_label(new_x, index)
+
+        prev_x = new_x
+        prev_y = new_y
+      end
+
+      @d = @d.fill_opacity 0.0
+      @d = @d.stroke data_row[DATA_COLOR_INDEX]
+      @d = @d.stroke_width clip_value_if_greater_than(@columns / (@norm_data.first[1].size * 4), 5.0)
+
+      @d = @d.bezier(*poly_points)
+    end
+
+    @d.draw(@base_image)
+  end
+
+
+end