Added the Gruff library to the lib/ directory of the the rails folder, and the

[selectricity] / lib / gruff-0.2.8 / lib / gruff / side_bar.rb

diff --git a/lib/gruff-0.2.8/lib/gruff/side_bar.rb b/lib/gruff-0.2.8/lib/gruff/side_bar.rb
new file mode 100644 (file)
index 0000000..9662d41
--- /dev/null
+++ b/lib/gruff-0.2.8/lib/gruff/side_bar.rb
@@ -0,0 +1,117 @@
+require File.dirname(__FILE__) + '/base'
+
+##
+# EXPERIMENTAL
+#
+# Graph with horizontal bars instead of vertical.
+#
+# TODO SideStackedBar should probably inherit from this 
+# to consolidate the line marker drawing.
+class Gruff::SideBar < Gruff::Base
+
+  # Instead of base class version, draws vertical background lines and label
+  def draw_line_markers
+
+    return if @hide_line_markers
+
+    @d = @d.stroke_antialias false
+      
+    # Draw horizontal line markers and annotate with numbers
+    @d = @d.stroke(@marker_color)
+    @d = @d.stroke_width 1
+    number_of_lines = 5
+
+    # TODO Round maximum marker value to a round number like 100, 0.1, 0.5, etc.
+    increment = significant(@maximum_value.to_f / number_of_lines)
+    (0..number_of_lines).each do |index|
+
+      line_diff    = (@graph_right - @graph_left) / number_of_lines
+      x            = @graph_right - (line_diff * index) - 1
+      @d           = @d.line(x, @graph_bottom, x, @graph_top)
+      diff         = index - number_of_lines
+      marker_label = diff.abs * increment
+
+      unless @hide_line_numbers
+        @d.fill      = @font_color
+        @d.font      = @font if @font
+        @d.stroke    = 'transparent'
+        @d.pointsize = scale_fontsize(@marker_font_size)
+        # @d.gravity = NorthGravity
+        @d           = @d.annotate_scaled( @base_image, 
+                          100, 20,
+                          x - (@marker_font_size/1.5), @graph_bottom + 40, 
+                          marker_label.to_s, @scale)
+      end # unless
+      @d = @d.stroke_antialias true
+    end
+  end
+
+  ##
+  # Draw on the Y axis instead of the X
+  
+  def draw_label(y_offset, index)
+    if !@labels[index].nil? && @labels_seen[index].nil?
+      @d.fill             = @font_color
+      @d.font             = @font if @font
+      @d.stroke           = 'transparent'
+      @d.font_weight      = NormalWeight
+      @d.pointsize        = scale_fontsize(@marker_font_size)
+      @d.gravity          = EastGravity
+      @d                  = @d.annotate_scaled(@base_image,
+                              1, 1,
+                              -@graph_left + LABEL_MARGIN * 2.0, y_offset,
+                              @labels[index], @scale)
+      @labels_seen[index] = 1
+    end
+  end
+
+  def draw
+    @has_left_labels = true
+    super
+
+    return unless @has_data
+
+    # Setup spacing.
+    #
+    # Columns sit stacked.
+    spacing_factor = 0.9
+
+    @bar_width = @graph_height / @column_count.to_f
+    @d         = @d.stroke_opacity 0.0
+    height     = Array.new(@column_count, 0)
+    length     = Array.new(@column_count, @graph_left)
+
+    @norm_data.each_with_index do |data_row, row_index|
+      @d = @d.fill data_row[DATA_COLOR_INDEX]
+
+      data_row[1].each_with_index do |data_point, point_index|
+
+         # Using the original calcs from the stacked bar chart 
+         # to get the difference between
+         # part of the bart chart we wish to stack.
+        temp1      = @graph_left + (@graph_width -
+                                data_point * @graph_width - 
+                                height[point_index]) + 1
+        temp2      = @graph_left + @graph_width - height[point_index] - 1
+        difference = temp2 - temp1
+
+        left_x                = length[point_index] #+ 1
+        left_y                = @graph_top + (@bar_width * point_index)
+        right_x               = left_x + difference
+        right_y               = left_y + @bar_width * spacing_factor
+        length[point_index] += difference
+        height[point_index] += (data_point * @graph_width - 2)
+
+        @d                    = @d.rectangle(left_x, left_y, right_x, right_y)
+
+        # Calculate center based on bar_width and current row
+        label_center          = @graph_top + (@bar_width * point_index) + (@bar_width * spacing_factor / 2.0)
+        draw_label(label_center, point_index)
+      end
+
+    end
+
+    @d.draw(@base_image)    
+  end
+
+end