Merge PR #33 from skyz04/main

Add Pie Chart Support For Negative Values

app/views/_pie.html.erb

@@ -11,9 +11,10 @@
                     <%=object[:percent_value] > 0.5 ? 1 : 0%> 1
                     <%= 150 - 125 * Math.cos(2 * Math::PI * cumulative_percent)%> 
                     <%= 150 - 125 * Math.sin(2 * Math::PI * cumulative_percent)%> Z" 
-                stroke="White" 
-                fill="<%=object[:color]%>"
-                stroke-width="1" />
+                stroke="<%= object[:is_negative] == 1 ? object[:color] : 'white' %>"
+                stroke-dasharray= '<%= object[:is_negative] == 1 ? 30 : 0 %>'
+                fill="<%= object[:is_negative] == 1 ? 'white' : object[:color] %>"
+                stroke-width="<%= object[:is_negative] == 1 ? 5 : 1 %>" />
                 <%-arc_x = 150 - 125 * Math.cos(2 * Math::PI * cumulative_percent)%>
                 <%-arc_y = 150 - 125 * Math.sin(2 * Math::PI * cumulative_percent)%>
 
@@ -28,6 +29,7 @@
         </svg>
     </div>
     <%# Insert the key here %>
+
 </div>
 
 <%= render :partial => '/styles' %>

lib/purechart/chart_helper.rb

@@ -126,20 +126,36 @@ def column_chart
         end
 
         def pie_chart(data)
+            # check for negative values 
+            has_negative_value = 0
+
             # Find total value for calculating percentages 
             total_value = 0
             data.each do |object|
-                total_value += object[:value]
+                total_value += (object[:value]).abs 
             end
             # Calculate percentages for each data point
             data.each do |object|
-                object[:percent_value] = Float(object[:value]) / total_value
+                object[:percent_value] = (Float(object[:value]) / total_value).abs 
+                if object[:value] < 0 
+                    object[:is_negative] = 1
+                    has_negative_value = 1 
+                else
+                    object[:is_negative] = 0
+                end
             end
 
+            negative_value = {
+                negative: has_negative_value
+            }
+
             ActionController::Base.render partial: '/pie', locals: {
-                data: data
+                data: data,
+                negative_value: negative_value
             }
         end
+
+
 
         def box_plot(data, configuration = {}, path="")