Redmine 3.4.4

lib/redmine/helpers/gantt.rb

@@ -0,0 +1,957 @@
+# Redmine - project management software
+# Copyright (C) 2006-2017  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+module Redmine
+  module Helpers
+    # Simple class to handle gantt chart data
+    class Gantt
+      class MaxLinesLimitReached < Exception
+      end
+
+      include ERB::Util
+      include Redmine::I18n
+      include Redmine::Utils::DateCalculation
+
+      # Relation types that are rendered
+      DRAW_TYPES = {
+        IssueRelation::TYPE_BLOCKS   => { :landscape_margin => 16, :color => '#F34F4F' },
+        IssueRelation::TYPE_PRECEDES => { :landscape_margin => 20, :color => '#628FEA' }
+      }.freeze
+
+      # :nodoc:
+      # Some utility methods for the PDF export
+      class PDF
+        MaxCharactorsForSubject = 45
+        TotalWidth = 280
+        LeftPaneWidth = 100
+
+        def self.right_pane_width
+          TotalWidth - LeftPaneWidth
+        end
+      end
+
+      attr_reader :year_from, :month_from, :date_from, :date_to, :zoom, :months, :truncated, :max_rows
+      attr_accessor :query
+      attr_accessor :project
+      attr_accessor :view
+
+      def initialize(options={})
+        options = options.dup
+        if options[:year] && options[:year].to_i >0
+          @year_from = options[:year].to_i
+          if options[:month] && options[:month].to_i >=1 && options[:month].to_i <= 12
+            @month_from = options[:month].to_i
+          else
+            @month_from = 1
+          end
+        else
+          @month_from ||= User.current.today.month
+          @year_from ||= User.current.today.year
+        end
+        zoom = (options[:zoom] || User.current.pref[:gantt_zoom]).to_i
+        @zoom = (zoom > 0 && zoom < 5) ? zoom : 2
+        months = (options[:months] || User.current.pref[:gantt_months]).to_i
+        @months = (months > 0 && months < 25) ? months : 6
+        # Save gantt parameters as user preference (zoom and months count)
+        if (User.current.logged? && (@zoom != User.current.pref[:gantt_zoom] ||
+              @months != User.current.pref[:gantt_months]))
+          User.current.pref[:gantt_zoom], User.current.pref[:gantt_months] = @zoom, @months
+          User.current.preference.save
+        end
+        @date_from = Date.civil(@year_from, @month_from, 1)
+        @date_to = (@date_from >> @months) - 1
+        @subjects = ''
+        @lines = ''
+        @number_of_rows = nil
+        @truncated = false
+        if options.has_key?(:max_rows)
+          @max_rows = options[:max_rows]
+        else
+          @max_rows = Setting.gantt_items_limit.blank? ? nil : Setting.gantt_items_limit.to_i
+        end
+      end
+
+      def common_params
+        { :controller => 'gantts', :action => 'show', :project_id => @project }
+      end
+
+      def params
+        common_params.merge({:zoom => zoom, :year => year_from,
+                             :month => month_from, :months => months})
+      end
+
+      def params_previous
+        common_params.merge({:year => (date_from << months).year,
+                             :month => (date_from << months).month,
+                             :zoom => zoom, :months => months})
+      end
+
+      def params_next
+        common_params.merge({:year => (date_from >> months).year,
+                             :month => (date_from >> months).month,
+                             :zoom => zoom, :months => months})
+      end
+
+      # Returns the number of rows that will be rendered on the Gantt chart
+      def number_of_rows
+        return @number_of_rows if @number_of_rows
+        rows = projects.inject(0) {|total, p| total += number_of_rows_on_project(p)}
+        rows > @max_rows ? @max_rows : rows
+      end
+
+      # Returns the number of rows that will be used to list a project on
+      # the Gantt chart.  This will recurse for each subproject.
+      def number_of_rows_on_project(project)
+        return 0 unless projects.include?(project)
+        count = 1
+        count += project_issues(project).size
+        count += project_versions(project).size
+        count
+      end
+
+      # Renders the subjects of the Gantt chart, the left side.
+      def subjects(options={})
+        render(options.merge(:only => :subjects)) unless @subjects_rendered
+        @subjects
+      end
+
+      # Renders the lines of the Gantt chart, the right side
+      def lines(options={})
+        render(options.merge(:only => :lines)) unless @lines_rendered
+        @lines
+      end
+
+      # Returns issues that will be rendered
+      def issues
+        @issues ||= @query.issues(
+          :include => [:assigned_to, :tracker, :priority, :category, :fixed_version],
+          :order => "#{Project.table_name}.lft ASC, #{Issue.table_name}.id ASC",
+          :limit => @max_rows
+        )
+      end
+
+      # Returns a hash of the relations between the issues that are present on the gantt
+      # and that should be displayed, grouped by issue ids.
+      def relations
+        return @relations if @relations
+        if issues.any?
+          issue_ids = issues.map(&:id)
+          @relations = IssueRelation.
+            where(:issue_from_id => issue_ids, :issue_to_id => issue_ids, :relation_type => DRAW_TYPES.keys).
+            group_by(&:issue_from_id)
+        else
+          @relations = {}
+        end
+      end
+
+      # Return all the project nodes that will be displayed
+      def projects
+        return @projects if @projects
+        ids = issues.collect(&:project).uniq.collect(&:id)
+        if ids.any?
+          # All issues projects and their visible ancestors
+          @projects = Project.visible.
+            joins("LEFT JOIN #{Project.table_name} child ON #{Project.table_name}.lft <= child.lft AND #{Project.table_name}.rgt >= child.rgt").
+            where("child.id IN (?)", ids).
+            order("#{Project.table_name}.lft ASC").
+            distinct.
+            to_a
+        else
+          @projects = []
+        end
+      end
+
+      # Returns the issues that belong to +project+
+      def project_issues(project)
+        @issues_by_project ||= issues.group_by(&:project)
+        @issues_by_project[project] || []
+      end
+
+      # Returns the distinct versions of the issues that belong to +project+
+      def project_versions(project)
+        project_issues(project).collect(&:fixed_version).compact.uniq
+      end
+
+      # Returns the issues that belong to +project+ and are assigned to +version+
+      def version_issues(project, version)
+        project_issues(project).select {|issue| issue.fixed_version == version}
+      end
+
+      def render(options={})
+        options = {:top => 0, :top_increment => 20,
+                   :indent_increment => 20, :render => :subject,
+                   :format => :html}.merge(options)
+        indent = options[:indent] || 4
+        @subjects = '' unless options[:only] == :lines
+        @lines = '' unless options[:only] == :subjects
+        @number_of_rows = 0
+        begin
+          Project.project_tree(projects) do |project, level|
+            options[:indent] = indent + level * options[:indent_increment]
+            render_project(project, options)
+          end
+        rescue MaxLinesLimitReached
+          @truncated = true
+        end
+        @subjects_rendered = true unless options[:only] == :lines
+        @lines_rendered = true unless options[:only] == :subjects
+        render_end(options)
+      end
+
+      def render_project(project, options={})
+        render_object_row(project, options)
+        increment_indent(options) do
+          # render issue that are not assigned to a version
+          issues = project_issues(project).select {|i| i.fixed_version.nil?}
+          render_issues(issues, options)
+          # then render project versions and their issues
+          versions = project_versions(project)
+          self.class.sort_versions!(versions)
+          versions.each do |version|
+            render_version(project, version, options)
+          end
+        end
+      end
+
+      def render_version(project, version, options={})
+        render_object_row(version, options)
+        increment_indent(options) do
+          issues = version_issues(project, version)
+          render_issues(issues, options)
+        end
+      end
+
+      def render_issues(issues, options={})
+        self.class.sort_issues!(issues)
+        ancestors = []
+        issues.each do |issue|
+          while ancestors.any? && !issue.is_descendant_of?(ancestors.last)
+            ancestors.pop
+            decrement_indent(options)
+          end
+          render_object_row(issue, options)
+          unless issue.leaf?
+            ancestors << issue
+            increment_indent(options)
+          end
+        end
+        decrement_indent(options, ancestors.size)
+      end
+
+      def render_object_row(object, options)
+        class_name = object.class.name.downcase
+        send("subject_for_#{class_name}", object, options) unless options[:only] == :lines
+        send("line_for_#{class_name}", object, options) unless options[:only] == :subjects
+        options[:top] += options[:top_increment]
+        @number_of_rows += 1
+        if @max_rows && @number_of_rows >= @max_rows
+          raise MaxLinesLimitReached
+        end
+      end
+
+      def render_end(options={})
+        case options[:format]
+        when :pdf
+          options[:pdf].Line(15, options[:top], PDF::TotalWidth, options[:top])
+        end
+      end
+
+      def increment_indent(options, factor=1)
+        options[:indent] += options[:indent_increment] * factor
+        if block_given?
+          yield
+          decrement_indent(options, factor)
+        end
+      end
+
+      def decrement_indent(options, factor=1)
+        increment_indent(options, -factor)
+      end
+
+      def subject_for_project(project, options)
+        subject(project.name, options, project)
+      end
+
+      def line_for_project(project, options)
+        # Skip projects that don't have a start_date or due date
+        if project.is_a?(Project) && project.start_date && project.due_date
+          label = project.name
+          line(project.start_date, project.due_date, nil, true, label, options, project)
+        end
+      end
+
+      def subject_for_version(version, options)
+        subject(version.to_s_with_project, options, version)
+      end
+
+      def line_for_version(version, options)
+        # Skip versions that don't have a start_date
+        if version.is_a?(Version) && version.due_date && version.start_date
+          label = "#{h(version)} #{h(version.completed_percent.to_f.round)}%"
+          label = h("#{version.project} -") + label unless @project && @project == version.project
+          line(version.start_date, version.due_date,  version.completed_percent, true, label, options, version)
+        end
+      end
+
+      def subject_for_issue(issue, options)
+        subject(issue.subject, options, issue)
+      end
+
+      def line_for_issue(issue, options)
+        # Skip issues that don't have a due_before (due_date or version's due_date)
+        if issue.is_a?(Issue) && issue.due_before
+          label = issue.status.name.dup
+          unless issue.disabled_core_fields.include?('done_ratio')
+            label << " #{issue.done_ratio}%"
+          end
+          markers = !issue.leaf?
+          line(issue.start_date, issue.due_before, issue.done_ratio, markers, label, options, issue)
+        end
+      end
+
+      def subject(label, options, object=nil)
+        send "#{options[:format]}_subject", options, label, object
+      end
+
+      def line(start_date, end_date, done_ratio, markers, label, options, object=nil)
+        options[:zoom] ||= 1
+        options[:g_width] ||= (self.date_to - self.date_from + 1) * options[:zoom]
+        coords = coordinates(start_date, end_date, done_ratio, options[:zoom])
+        send "#{options[:format]}_task", options, coords, markers, label, object
+      end
+
+      # Generates a gantt image
+      # Only defined if RMagick is avalaible
+      def to_image(format='PNG')
+        date_to = (@date_from >> @months) - 1
+        show_weeks = @zoom > 1
+        show_days = @zoom > 2
+        subject_width = 400
+        header_height = 18
+        # width of one day in pixels
+        zoom = @zoom * 2
+        g_width = (@date_to - @date_from + 1) * zoom
+        g_height = 20 * number_of_rows + 30
+        headers_height = (show_weeks ? 2 * header_height : header_height)
+        height = g_height + headers_height
+        imgl = Magick::ImageList.new
+        imgl.new_image(subject_width + g_width + 1, height)
+        gc = Magick::Draw.new
+        gc.font = Redmine::Configuration['rmagick_font_path'] || ""
+        # Subjects
+        gc.stroke('transparent')
+        subjects(:image => gc, :top => (headers_height + 20), :indent => 4, :format => :image)
+        # Months headers
+        month_f = @date_from
+        left = subject_width
+        @months.times do
+          width = ((month_f >> 1) - month_f) * zoom
+          gc.fill('white')
+          gc.stroke('grey')
+          gc.stroke_width(1)
+          gc.rectangle(left, 0, left + width, height)
+          gc.fill('black')
+          gc.stroke('transparent')
+          gc.stroke_width(1)
+          gc.text(left.round + 8, 14, "#{month_f.year}-#{month_f.month}")
+          left = left + width
+          month_f = month_f >> 1
+        end
+        # Weeks headers
+        if show_weeks
+          left = subject_width
+          height = header_height
+          if @date_from.cwday == 1
+            # date_from is monday
+            week_f = date_from
+          else
+            # find next monday after date_from
+            week_f = @date_from + (7 - @date_from.cwday + 1)
+            width = (7 - @date_from.cwday + 1) * zoom
+            gc.fill('white')
+            gc.stroke('grey')
+            gc.stroke_width(1)
+            gc.rectangle(left, header_height, left + width, 2 * header_height + g_height - 1)
+            left = left + width
+          end
+          while week_f <= date_to
+            width = (week_f + 6 <= date_to) ? 7 * zoom : (date_to - week_f + 1) * zoom
+            gc.fill('white')
+            gc.stroke('grey')
+            gc.stroke_width(1)
+            gc.rectangle(left.round, header_height, left.round + width, 2 * header_height + g_height - 1)
+            gc.fill('black')
+            gc.stroke('transparent')
+            gc.stroke_width(1)
+            gc.text(left.round + 2, header_height + 14, week_f.cweek.to_s)
+            left = left + width
+            week_f = week_f + 7
+          end
+        end
+        # Days details (week-end in grey)
+        if show_days
+          left = subject_width
+          height = g_height + header_height - 1
+          wday = @date_from.cwday
+          (date_to - @date_from + 1).to_i.times do
+            width =  zoom
+            gc.fill(non_working_week_days.include?(wday) ? '#eee' : 'white')
+            gc.stroke('#ddd')
+            gc.stroke_width(1)
+            gc.rectangle(left, 2 * header_height, left + width, 2 * header_height + g_height - 1)
+            left = left + width
+            wday = wday + 1
+            wday = 1 if wday > 7
+          end
+        end
+        # border
+        gc.fill('transparent')
+        gc.stroke('grey')
+        gc.stroke_width(1)
+        gc.rectangle(0, 0, subject_width + g_width, headers_height)
+        gc.stroke('black')
+        gc.rectangle(0, 0, subject_width + g_width, g_height + headers_height - 1)
+        # content
+        top = headers_height + 20
+        gc.stroke('transparent')
+        lines(:image => gc, :top => top, :zoom => zoom,
+              :subject_width => subject_width, :format => :image)
+        # today red line
+        if User.current.today >= @date_from and User.current.today <= date_to
+          gc.stroke('red')
+          x = (User.current.today - @date_from + 1) * zoom + subject_width
+          gc.line(x, headers_height, x, headers_height + g_height - 1)
+        end
+        gc.draw(imgl)
+        imgl.format = format
+        imgl.to_blob
+      end if Object.const_defined?(:Magick)
+
+      def to_pdf
+        pdf = ::Redmine::Export::PDF::ITCPDF.new(current_language)
+        pdf.SetTitle("#{l(:label_gantt)} #{project}")
+        pdf.alias_nb_pages
+        pdf.footer_date = format_date(User.current.today)
+        pdf.AddPage("L")
+        pdf.SetFontStyle('B', 12)
+        pdf.SetX(15)
+        pdf.RDMCell(PDF::LeftPaneWidth, 20, project.to_s)
+        pdf.Ln
+        pdf.SetFontStyle('B', 9)
+        subject_width = PDF::LeftPaneWidth
+        header_height = 5
+        headers_height = header_height
+        show_weeks = false
+        show_days = false
+        if self.months < 7
+          show_weeks = true
+          headers_height = 2 * header_height
+          if self.months < 3
+            show_days = true
+            headers_height = 3 * header_height
+            if self.months < 2
+              show_day_num = true
+              headers_height = 4 * header_height
+            end
+          end
+        end
+        g_width = PDF.right_pane_width
+        zoom = (g_width) / (self.date_to - self.date_from + 1)
+        g_height = 120
+        t_height = g_height + headers_height
+        y_start = pdf.GetY
+        # Months headers
+        month_f = self.date_from
+        left = subject_width
+        height = header_height
+        self.months.times do
+          width = ((month_f >> 1) - month_f) * zoom
+          pdf.SetY(y_start)
+          pdf.SetX(left)
+          pdf.RDMCell(width, height, "#{month_f.year}-#{month_f.month}", "LTR", 0, "C")
+          left = left + width
+          month_f = month_f >> 1
+        end
+        # Weeks headers
+        if show_weeks
+          left = subject_width
+          height = header_height
+          if self.date_from.cwday == 1
+            # self.date_from is monday
+            week_f = self.date_from
+          else
+            # find next monday after self.date_from
+            week_f = self.date_from + (7 - self.date_from.cwday + 1)
+            width = (7 - self.date_from.cwday + 1) * zoom-1
+            pdf.SetY(y_start + header_height)
+            pdf.SetX(left)
+            pdf.RDMCell(width + 1, height, "", "LTR")
+            left = left + width + 1
+          end
+          while week_f <= self.date_to
+            width = (week_f + 6 <= self.date_to) ? 7 * zoom : (self.date_to - week_f + 1) * zoom
+            pdf.SetY(y_start + header_height)
+            pdf.SetX(left)
+            pdf.RDMCell(width, height, (width >= 5 ? week_f.cweek.to_s : ""), "LTR", 0, "C")
+            left = left + width
+            week_f = week_f + 7
+          end
+        end
+        # Day numbers headers
+        if show_day_num
+          left = subject_width
+          height = header_height
+          day_num = self.date_from
+          wday = self.date_from.cwday
+          pdf.SetFontStyle('B', 7)
+          (self.date_to - self.date_from + 1).to_i.times do
+            width = zoom
+            pdf.SetY(y_start + header_height * 2)
+            pdf.SetX(left)
+            pdf.SetTextColor(non_working_week_days.include?(wday) ? 150 : 0)
+            pdf.RDMCell(width, height, day_num.day.to_s, "LTR", 0, "C")
+            left = left + width
+            day_num = day_num + 1
+            wday = wday + 1
+            wday = 1 if wday > 7
+          end
+        end
+        # Days headers
+        if show_days
+          left = subject_width
+          height = header_height
+          wday = self.date_from.cwday
+          pdf.SetFontStyle('B', 7)
+          (self.date_to - self.date_from + 1).to_i.times do
+            width = zoom
+            pdf.SetY(y_start + header_height * (show_day_num ? 3 : 2))
+            pdf.SetX(left)
+            pdf.SetTextColor(non_working_week_days.include?(wday) ? 150 : 0)
+            pdf.RDMCell(width, height, day_name(wday).first, "LTR", 0, "C")
+            left = left + width
+            wday = wday + 1
+            wday = 1 if wday > 7
+          end
+        end
+        pdf.SetY(y_start)
+        pdf.SetX(15)
+        pdf.SetTextColor(0)
+        pdf.RDMCell(subject_width + g_width - 15, headers_height, "", 1)
+        # Tasks
+        top = headers_height + y_start
+        options = {
+          :top => top,
+          :zoom => zoom,
+          :subject_width => subject_width,
+          :g_width => g_width,
+          :indent => 0,
+          :indent_increment => 5,
+          :top_increment => 5,
+          :format => :pdf,
+          :pdf => pdf
+        }
+        render(options)
+        pdf.Output
+      end
+
+      private
+
+      def coordinates(start_date, end_date, progress, zoom=nil)
+        zoom ||= @zoom
+        coords = {}
+        if start_date && end_date && start_date < self.date_to && end_date > self.date_from
+          if start_date > self.date_from
+            coords[:start] = start_date - self.date_from
+            coords[:bar_start] = start_date - self.date_from
+          else
+            coords[:bar_start] = 0
+          end
+          if end_date < self.date_to
+            coords[:end] = end_date - self.date_from
+            coords[:bar_end] = end_date - self.date_from + 1
+          else
+            coords[:bar_end] = self.date_to - self.date_from + 1
+          end
+          if progress
+            progress_date = calc_progress_date(start_date, end_date, progress)
+            if progress_date > self.date_from && progress_date > start_date
+              if progress_date < self.date_to
+                coords[:bar_progress_end] = progress_date - self.date_from
+              else
+                coords[:bar_progress_end] = self.date_to - self.date_from + 1
+              end
+            end
+            if progress_date < User.current.today
+              late_date = [User.current.today, end_date].min
+              if late_date > self.date_from && late_date > start_date
+                if late_date < self.date_to
+                  coords[:bar_late_end] = late_date - self.date_from + 1
+                else
+                  coords[:bar_late_end] = self.date_to - self.date_from + 1
+                end
+              end
+            end
+          end
+        end
+        # Transforms dates into pixels witdh
+        coords.keys.each do |key|
+          coords[key] = (coords[key] * zoom).floor
+        end
+        coords
+      end
+
+      def calc_progress_date(start_date, end_date, progress)
+        start_date + (end_date - start_date + 1) * (progress / 100.0)
+      end
+
+      def self.sort_issues!(issues)
+        issues.sort! {|a, b| sort_issue_logic(a) <=> sort_issue_logic(b)}
+      end
+
+      def self.sort_issue_logic(issue)
+        julian_date = Date.new()
+        ancesters_start_date = []
+        current_issue = issue
+        begin
+          ancesters_start_date.unshift([current_issue.start_date || julian_date, current_issue.id])
+          current_issue = current_issue.parent
+        end while (current_issue)
+        ancesters_start_date
+      end
+
+      def self.sort_versions!(versions)
+        versions.sort!
+      end
+
+      def pdf_new_page?(options)
+        if options[:top] > 180
+          options[:pdf].Line(15, options[:top], PDF::TotalWidth, options[:top])
+          options[:pdf].AddPage("L")
+          options[:top] = 15
+          options[:pdf].Line(15, options[:top] - 0.1, PDF::TotalWidth, options[:top] - 0.1)
+        end
+      end
+
+      def html_subject_content(object)
+        case object
+        when Issue
+          issue = object
+          css_classes = ''
+          css_classes << ' issue-overdue' if issue.overdue?
+          css_classes << ' issue-behind-schedule' if issue.behind_schedule?
+          css_classes << ' icon icon-issue' unless Setting.gravatar_enabled? && issue.assigned_to
+          css_classes << ' issue-closed' if issue.closed?
+          if issue.start_date && issue.due_before && issue.done_ratio
+            progress_date = calc_progress_date(issue.start_date,
+                                               issue.due_before, issue.done_ratio)
+            css_classes << ' behind-start-date' if progress_date < self.date_from
+            css_classes << ' over-end-date' if progress_date > self.date_to
+          end
+          s = "".html_safe
+          if issue.assigned_to.present?
+            assigned_string = l(:field_assigned_to) + ": " + issue.assigned_to.name
+            s << view.avatar(issue.assigned_to,
+                             :class => 'gravatar icon-gravatar',
+                             :size => 13,
+                             :title => assigned_string).to_s.html_safe
+          end
+          s << view.link_to_issue(issue).html_safe
+          view.content_tag(:span, s, :class => css_classes).html_safe
+        when Version
+          version = object
+          html_class = ""
+          html_class << 'icon icon-package '
+          html_class << (version.behind_schedule? ? 'version-behind-schedule' : '') << " "
+          html_class << (version.overdue? ? 'version-overdue' : '')
+          html_class << ' version-closed' unless version.open?
+          if version.start_date && version.due_date && version.completed_percent
+            progress_date = calc_progress_date(version.start_date,
+                                               version.due_date, version.completed_percent)
+            html_class << ' behind-start-date' if progress_date < self.date_from
+            html_class << ' over-end-date' if progress_date > self.date_to
+          end
+          s = view.link_to_version(version).html_safe
+          view.content_tag(:span, s, :class => html_class).html_safe
+        when Project
+          project = object
+          html_class = ""
+          html_class << 'icon icon-projects '
+          html_class << (project.overdue? ? 'project-overdue' : '')
+          s = view.link_to_project(project).html_safe
+          view.content_tag(:span, s, :class => html_class).html_safe
+        end
+      end
+
+      def html_subject(params, subject, object)
+        style = "position: absolute;top:#{params[:top]}px;left:#{params[:indent]}px;"
+        style << "width:#{params[:subject_width] - params[:indent]}px;" if params[:subject_width]
+        content = html_subject_content(object) || subject
+        tag_options = {:style => style}
+        case object
+        when Issue
+          tag_options[:id] = "issue-#{object.id}"
+          tag_options[:class] = "issue-subject"
+          tag_options[:title] = object.subject
+        when Version
+          tag_options[:id] = "version-#{object.id}"
+          tag_options[:class] = "version-name"
+        when Project
+          tag_options[:class] = "project-name"
+        end
+        output = view.content_tag(:div, content, tag_options)
+        @subjects << output
+        output
+      end
+
+      def pdf_subject(params, subject, options={})
+        pdf_new_page?(params)
+        params[:pdf].SetY(params[:top])
+        params[:pdf].SetX(15)
+        char_limit = PDF::MaxCharactorsForSubject - params[:indent]
+        params[:pdf].RDMCell(params[:subject_width] - 15, 5,
+                             (" " * params[:indent]) +
+                               subject.to_s.sub(/^(.{#{char_limit}}[^\s]*\s).*$/, '\1 (...)'),
+                              "LR")
+        params[:pdf].SetY(params[:top])
+        params[:pdf].SetX(params[:subject_width])
+        params[:pdf].RDMCell(params[:g_width], 5, "", "LR")
+      end
+
+      def image_subject(params, subject, options={})
+        params[:image].fill('black')
+        params[:image].stroke('transparent')
+        params[:image].stroke_width(1)
+        params[:image].text(params[:indent], params[:top] + 2, subject)
+      end
+
+      def issue_relations(issue)
+        rels = {}
+        if relations[issue.id]
+          relations[issue.id].each do |relation|
+            (rels[relation.relation_type] ||= []) << relation.issue_to_id
+          end
+        end
+        rels
+      end
+
+      def html_task(params, coords, markers, label, object)
+        output = ''
+
+        css = "task " + case object
+          when Project
+            "project"
+          when Version
+            "version"
+          when Issue
+            object.leaf? ? 'leaf' : 'parent'
+          else
+            ""
+          end
+
+        # Renders the task bar, with progress and late
+        if coords[:bar_start] && coords[:bar_end]
+          width = coords[:bar_end] - coords[:bar_start] - 2
+          style = ""
+          style << "top:#{params[:top]}px;"
+          style << "left:#{coords[:bar_start]}px;"
+          style << "width:#{width}px;"
+          html_id = "task-todo-issue-#{object.id}" if object.is_a?(Issue)
+          html_id = "task-todo-version-#{object.id}" if object.is_a?(Version)
+          content_opt = {:style => style,
+                         :class => "#{css} task_todo",
+                         :id => html_id}
+          if object.is_a?(Issue)
+            rels = issue_relations(object)
+            if rels.present?
+              content_opt[:data] = {"rels" => rels.to_json}
+            end
+          end
+          output << view.content_tag(:div, '&nbsp;'.html_safe, content_opt)
+          if coords[:bar_late_end]
+            width = coords[:bar_late_end] - coords[:bar_start] - 2
+            style = ""
+            style << "top:#{params[:top]}px;"
+            style << "left:#{coords[:bar_start]}px;"
+            style << "width:#{width}px;"
+            output << view.content_tag(:div, '&nbsp;'.html_safe,
+                                       :style => style,
+                                       :class => "#{css} task_late")
+          end
+          if coords[:bar_progress_end]
+            width = coords[:bar_progress_end] - coords[:bar_start] - 2
+            style = ""
+            style << "top:#{params[:top]}px;"
+            style << "left:#{coords[:bar_start]}px;"
+            style << "width:#{width}px;"
+            html_id = "task-done-issue-#{object.id}" if object.is_a?(Issue)
+            html_id = "task-done-version-#{object.id}" if object.is_a?(Version)
+            output << view.content_tag(:div, '&nbsp;'.html_safe,
+                                       :style => style,
+                                       :class => "#{css} task_done",
+                                       :id => html_id)
+          end
+        end
+        # Renders the markers
+        if markers
+          if coords[:start]
+            style = ""
+            style << "top:#{params[:top]}px;"
+            style << "left:#{coords[:start]}px;"
+            style << "width:15px;"
+            output << view.content_tag(:div, '&nbsp;'.html_safe,
+                                       :style => style,
+                                       :class => "#{css} marker starting")
+          end
+          if coords[:end]
+            style = ""
+            style << "top:#{params[:top]}px;"
+            style << "left:#{coords[:end] + params[:zoom]}px;"
+            style << "width:15px;"
+            output << view.content_tag(:div, '&nbsp;'.html_safe,
+                                       :style => style,
+                                       :class => "#{css} marker ending")
+          end
+        end
+        # Renders the label on the right
+        if label
+          style = ""
+          style << "top:#{params[:top]}px;"
+          style << "left:#{(coords[:bar_end] || 0) + 8}px;"
+          style << "width:15px;"
+          output << view.content_tag(:div, label,
+                                     :style => style,
+                                     :class => "#{css} label")
+        end
+        # Renders the tooltip
+        if object.is_a?(Issue) && coords[:bar_start] && coords[:bar_end]
+          s = view.content_tag(:span,
+                               view.render_issue_tooltip(object).html_safe,
+                               :class => "tip")
+          style = ""
+          style << "position: absolute;"
+          style << "top:#{params[:top]}px;"
+          style << "left:#{coords[:bar_start]}px;"
+          style << "width:#{coords[:bar_end] - coords[:bar_start]}px;"
+          style << "height:12px;"
+          output << view.content_tag(:div, s.html_safe,
+                                     :style => style,
+                                     :class => "tooltip")
+        end
+        @lines << output
+        output
+      end
+
+      def pdf_task(params, coords, markers, label, object)
+        cell_height_ratio = params[:pdf].get_cell_height_ratio()
+        params[:pdf].set_cell_height_ratio(0.1)
+
+        height = 2
+        height /= 2 if markers
+        # Renders the task bar, with progress and late
+        if coords[:bar_start] && coords[:bar_end]
+          params[:pdf].SetY(params[:top] + 1.5)
+          params[:pdf].SetX(params[:subject_width] + coords[:bar_start])
+          params[:pdf].SetFillColor(200, 200, 200)
+          params[:pdf].RDMCell(coords[:bar_end] - coords[:bar_start], height, "", 0, 0, "", 1)
+          if coords[:bar_late_end]
+            params[:pdf].SetY(params[:top] + 1.5)
+            params[:pdf].SetX(params[:subject_width] + coords[:bar_start])
+            params[:pdf].SetFillColor(255, 100, 100)
+            params[:pdf].RDMCell(coords[:bar_late_end] - coords[:bar_start], height, "", 0, 0, "", 1)
+          end
+          if coords[:bar_progress_end]
+            params[:pdf].SetY(params[:top] + 1.5)
+            params[:pdf].SetX(params[:subject_width] + coords[:bar_start])
+            params[:pdf].SetFillColor(90, 200, 90)
+            params[:pdf].RDMCell(coords[:bar_progress_end] - coords[:bar_start], height, "", 0, 0, "", 1)
+          end
+        end
+        # Renders the markers
+        if markers
+          if coords[:start]
+            params[:pdf].SetY(params[:top] + 1)
+            params[:pdf].SetX(params[:subject_width] + coords[:start] - 1)
+            params[:pdf].SetFillColor(50, 50, 200)
+            params[:pdf].RDMCell(2, 2, "", 0, 0, "", 1)
+          end
+          if coords[:end]
+            params[:pdf].SetY(params[:top] + 1)
+            params[:pdf].SetX(params[:subject_width] + coords[:end] - 1)
+            params[:pdf].SetFillColor(50, 50, 200)
+            params[:pdf].RDMCell(2, 2, "", 0, 0, "", 1)
+          end
+        end
+        # Renders the label on the right
+        if label
+          params[:pdf].SetX(params[:subject_width] + (coords[:bar_end] || 0) + 5)
+          params[:pdf].RDMCell(30, 2, label)
+        end
+
+        params[:pdf].set_cell_height_ratio(cell_height_ratio)
+      end
+
+      def image_task(params, coords, markers, label, object)
+        height = 6
+        height /= 2 if markers
+        # Renders the task bar, with progress and late
+        if coords[:bar_start] && coords[:bar_end]
+          params[:image].fill('#aaa')
+          params[:image].rectangle(params[:subject_width] + coords[:bar_start],
+                                   params[:top],
+                                   params[:subject_width] + coords[:bar_end],
+                                   params[:top] - height)
+          if coords[:bar_late_end]
+            params[:image].fill('#f66')
+            params[:image].rectangle(params[:subject_width] + coords[:bar_start],
+                                     params[:top],
+                                     params[:subject_width] + coords[:bar_late_end],
+                                     params[:top] - height)
+          end
+          if coords[:bar_progress_end]
+            params[:image].fill('#00c600')
+            params[:image].rectangle(params[:subject_width] + coords[:bar_start],
+                                     params[:top],
+                                     params[:subject_width] + coords[:bar_progress_end],
+                                     params[:top] - height)
+          end
+        end
+        # Renders the markers
+        if markers
+          if coords[:start]
+            x = params[:subject_width] + coords[:start]
+            y = params[:top] - height / 2
+            params[:image].fill('blue')
+            params[:image].polygon(x - 4, y, x, y - 4, x + 4, y, x, y + 4)
+          end
+          if coords[:end]
+            x = params[:subject_width] + coords[:end] + params[:zoom]
+            y = params[:top] - height / 2
+            params[:image].fill('blue')
+            params[:image].polygon(x - 4, y, x, y - 4, x + 4, y, x, y + 4)
+          end
+        end
+        # Renders the label on the right
+        if label
+          params[:image].fill('black')
+          params[:image].text(params[:subject_width] + (coords[:bar_end] || 0) + 5,
+                              params[:top] + 1,
+                              label)
+        end
+      end
+    end
+  end
+end