Adding a widget that shows issue assignment flow

app/controllers/graphs_controller.rb

@@ -10,6 +10,26 @@ class GraphsController < ApplicationController
     
     helper IssuesHelper
         
+    def recent_assigned_to_changes_graph
+        # Get the top visible projects by issue count
+        sql = " select u1.id as old_user, u2.id as new_user, count(*) as changes_count"
+        sql << " from journals as j"
+        sql << " left join journal_details as jd on j.id = jd.journal_id"
+        sql << " left join users as u1 on jd.old_value = u1.id"
+        sql << " left join users as u2 on jd.value = u2.id"
+        sql << " where journalized_type = 'issue' and prop_key = 'assigned_to_id' and  DATE_SUB(CURRENT_TIMESTAMP, INTERVAL 1 DAY) <= j.created_on"
+        sql << " and (u1.id = #{User.current.id} or u2.id = #{User.current.id})"
+        sql << " and u1.id <> 0 and u2.id <> 0"
+        sql << " group by old_value, value"
+        @assigned_to_changes = ActiveRecord::Base.connection.select_all(sql)
+        user_ids = @assigned_to_changes.collect { |change| [change["old_user"].to_i, change["new_user"].to_i] }.flatten.uniq
+        user_ids.delete(User.current.id)
+        @users = User.find(:all, :conditions => "id IN ("+user_ids.join(',')+")").index_by { |user| user.id } unless user_ids.empty?
+        
+        headers["Content-Type"] = "image/svg+xml"
+        render :layout => false
+    end
+    
     def recent_status_changes_graph
         # Get the top visible projects by issue count
         sql = " select is1.id as old_status, is2.id as new_status, count(*) as changes_count"

app/views/graphs/recent_assigned_to_changes_graph.html.erb

@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+
+<%
+    points = Hash.new
+    points[User.current.id] = { "x" => 140, "y" => 140 }
+    i = -1
+    @users.each do |user_id, user|
+        points[user_id] = {
+            "x" => Math.sin(2*Math::PI*i/@users.size)*100 + 140,
+            "y" => Math.cos(2*Math::PI*i/@users.size)*100 + 140
+        }
+        i -= 1
+    end unless @users.nil?
+%>
+
+<svg xmlns="http://www.w3.org/2000/svg" version="1.0" width="280" height="280">
+  <g fill-opacity="0.2" stroke-opacity="0.5">
+    <% @assigned_to_changes.each do |assigned_to_change| %>
+        <%
+            changes_count = [assigned_to_change["changes_count"].to_i*3,35].min
+            old_user = assigned_to_change["old_user"].to_i
+            new_user = assigned_to_change["new_user"].to_i
+            
+            x1 = points[old_user]["x"]
+            y1 = points[old_user]["y"]
+            
+            x2 = points[new_user]["x"]
+            y2 = points[new_user]["y"]
+            
+            atan2 = -Math.atan2(y1-y2,x1-x2)
+            xdiff = Math.sin(atan2)*changes_count
+            ydiff = Math.cos(atan2)*changes_count
+        %>
+        <polygon
+            points="
+                <%= x1-xdiff %>,<%= y1-ydiff %>
+                <%= x1+xdiff %>,<%= y1+ydiff %>
+                <%= x2+xdiff/5 %>,<%= y2+ydiff/5 %>
+                <%= x2-xdiff/5 %>,<%= y2-ydiff/5 %>"
+            fill="<%= assigned_to_change["old_user"].to_i == User.current.id ? "green" : "red" %>"
+            stroke="<%= assigned_to_change["old_user"].to_i == User.current.id ? "green" : "red" %>"
+        />
+    <% end %>
+  </g>
+  <g fill="#EEEEEE" stroke="black" stroke-width="1" stroke-opacity="0.75">
+    <% points.each do |user_id, point| %>
+        <circle cx="<%= point["x"] %>" cy="<%= point["y"] %>" r="35" />
+    <% end %>
+  </g>
+  <g font-family="Helvetica, Arial" font-size="12" text-anchor="middle">
+    <% points.each do |user_id, point| %>
+        <text x="<%= point["x"] %>" y="<%= point["y"] + 3 %>"><%= user_id == User.current.id ? User.current : @users[user_id] %></text>
+    <% end %>
+  </g>
+</svg>

app/views/my/blocks/_recent_assigned_to_changes_graph.html.erb

@@ -0,0 +1,5 @@
+<h3><%= l(:label_graphs_issue_status_flow) %></h3>
+
+<div style="text-align: center">
+<%= tag("embed", :width => "280", :height => 280, :type => "image/svg+xml", :src => url_for(:controller => 'graphs', :action => 'recent_assigned_to_changes_graph')) %>
+</div>