X-Git-Url: https://projects.mako.cc/source/selectricity-live/blobdiff_plain/dc635b6d39be19a09a428282b6d639d029908df6..22f84a3ea8bc39eb4cb91575d35dfca683336032:/vendor/plugins/gruff/lib/gruff/spider.rb

diff --git a/vendor/plugins/gruff/lib/gruff/spider.rb b/vendor/plugins/gruff/lib/gruff/spider.rb
new file mode 100644
index 0000000..7710426
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+++ b/vendor/plugins/gruff/lib/gruff/spider.rb
@@ -0,0 +1,130 @@
+
+require File.dirname(__FILE__) + '/base'
+
+# Experimental!!! See also the Net graph.
+#
+# Submitted by Kevin Clark http://glu.ttono.us/
+class Gruff::Spider < Gruff::Base
+  
+  # Hide all text
+  attr_reader :hide_text
+  attr_accessor :hide_axes
+  attr_reader :transparent_background
+  
+  def transparent_background=(value)
+    @transparent_background = value
+    @base_image = render_transparent_background if value
+  end
+
+  def hide_text=(value)
+    @hide_title = @hide_text = value
+  end
+  
+  def initialize(max_value, target_width = 800)
+    super(target_width)
+    @max_value = max_value
+    @hide_legend = true;
+  end
+  
+  def draw
+    @hide_line_markers = true
+    
+    super
+
+    return unless @has_data
+
+    # Setup basic positioning
+    diameter = @graph_height
+    radius = @graph_height / 2.0
+    top_x = @graph_left + (@graph_width - diameter) / 2.0
+    center_x = @graph_left + (@graph_width / 2.0)
+    center_y = @graph_top + (@graph_height / 2.0) - 25 # Move graph up a bit
+    
+    @unit_length = radius / @max_value
+    
+        
+    total_sum = sums_for_spider
+    prev_degrees = 0.0
+    additive_angle = (2 * Math::PI)/ @data.size
+    
+    current_angle = 0.0
+
+    # Draw axes
+    draw_axes(center_x, center_y, radius, additive_angle) unless hide_axes    
+    
+    # Draw polygon
+    draw_polygon(center_x, center_y, additive_angle)
+    
+     
+    @d.draw(@base_image)
+  end
+
+private
+  
+  def normalize_points(value)
+    value * @unit_length
+  end
+  
+  def draw_label(center_x, center_y, angle, radius, amount)
+    r_offset = 50      # The distance out from the center of the pie to get point
+    x_offset = center_x      # The label points need to be tweaked slightly
+    y_offset = center_y + 0  # This one doesn't though
+    x = x_offset + ((radius + r_offset) * Math.cos(angle))
+    y = y_offset + ((radius + r_offset) * Math.sin(angle))
+    
+    # Draw label
+    @d.fill = @marker_color
+    @d.font = @font if @font
+    @d.pointsize = scale_fontsize(legend_font_size)
+    @d.stroke = 'transparent'
+    @d.font_weight = BoldWeight
+    @d.gravity = CenterGravity
+    @d.annotate_scaled( @base_image, 
+                      0, 0,
+                      x, y, 
+                      amount, @scale)
+  end
+  
+  def draw_axes(center_x, center_y, radius, additive_angle, line_color = nil)
+    return if hide_axes
+    
+    current_angle = 0.0
+    
+    @data.each do |data_row|
+      @d.stroke(line_color || data_row[DATA_COLOR_INDEX])
+      @d.stroke_width 5.0
+    
+      x_offset = radius * Math.cos(current_angle)
+      y_offset = radius * Math.sin(current_angle)
+
+      @d.line(center_x, center_y,
+              center_x + x_offset,
+              center_y + y_offset)
+            
+      draw_label(center_x, center_y, current_angle, radius, data_row[0].to_s) unless hide_text
+            
+      current_angle += additive_angle
+    end
+  end
+  
+  def draw_polygon(center_x, center_y, additive_angle, color = nil)
+    points = []
+    current_angle = 0.0
+    @data.each do |data_row|
+      points << center_x + normalize_points(data_row[1][0]) * Math.cos(current_angle)
+      points << center_y + normalize_points(data_row[1][0]) * Math.sin(current_angle)
+      current_angle += additive_angle
+    end
+    
+    @d.stroke_width 1.0
+    @d.stroke(color || @marker_color)
+    @d.fill(color || @marker_color)
+    @d.fill_opacity 0.4
+    @d.polygon(*points)
+  end
+  
+  def sums_for_spider
+    @data.inject(0.0) {|sum, data_row| sum += data_row[1][0]}
+  end
+
+end