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Lines 117 and 118 calculate the zoom factor to pass to the zoomPoint()method. zoom_factor is the product of the form variables zoom and zsize. Recall that zoom is set to 0 if pan equals "CHECKED", 1 if zoomout equals "CHECKED", and 1 if zoomin equals "CHECKED". Lines 119 through 132 then set the values of the navigation variables that are to be saved in the form. There are a couple of things to note. Line 121 sets zoom_factor to 1 if zoom_factor equals 0 since the zoomPoint() method can t accept a zoom factor of 0. Line 119 sets zoomsize to the absolute value of the form variable zsize, just in case a user should enter a negative value. (A negative zsize would reverse the meaning of the Zoom In and Zoom Out radio buttons.) 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 zoom_factor = int(parms.getfirst('zoom') ) \ * int(parms.getfirst('zsize') ) zoomsize = str( abs( int( parms.getfirst('zsize') ) ) ) if zoom_factor == 0: zoom_factor = 1 pan = "CHECKED" zoomout = "" zoomin = "" elif zoom_factor < 0: pan = "" zoomout = "CHECKED" zoomin = "" else: pan = "" zoomout = "" zoomin = "CHECKED"

Text is not the only type of value that you can display. It s actually possible to show any JSF components mixed with any HTML markup as the status. <a4j:status> defines two facets, stop and start, which work basically the same way as startText and stopText: <a4j:status id="stateStatus"> <f:facet name="start"> <h:graphicImage value="/Ajax-loader.gif"/> </f:facet> </a4j:status> I decided not to define the stop facet in this example. Keep in mind that if you need to include more than one JSF component in this facet, you need to use <h:panelGroup> to group the components because <f:facet> allows only one child.

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<% @releases.each do |release| %> <tr> <td><%=h release.movie.title %></td> <td><%=h release.format %></td> <td><%=h release.released_on %></td> </tr> <% end %> </table> Notice that there are no administration links on the view no create new notification or edit, for instance; since notifications are bound directly to releases, such links are unnecessary. In the controller, the only changes you need to make are to restrict the index action to logged-in users, and retrieve the releases in which the current user is interested; Listing 3-43 shows the updates. Listing 3-43. Adding the login filter and index action to app/controllers/ notifications_controller.rb class NotificationsController < ApplicationController before_filter :login_required def index @releases = current_user.releases end end And after that, you have to add a new releases method to the User model, to pick out just those releases in which a given user has an interest (Listing 3-44). Listing 3-44. Adding the releases method to app/models/user.rb class User < ActiveRecord::Base # ... def releases movie_ids = movies.map(&:id) Release.find(:all, :include => :movie, :conditions => ["movie_id IN ( )", movie_ids], :order => 'released_on DESC') end protected # ... end

Finally, Lines 135 and 136 employ the zoomPoint() method to center the map on the click point, and then zoom in or out according to the value of zoom_factor. 135 136 map.zoomPoint(zoom_factor,clkpoint,map.width, map.height,old_extent,max_extent) \

You ve now created the map, zoomed or panned, and changed its extent. At this point, execution drops out of the block conditioned on the presence of form variables, and prepare to both draw the images and generate the HTML that s to be forwarded to the browser. You can skip this step since you ve been through this part of the code before. The only part of this code you haven t looked at is the function img2map() in Lines 008 through 022. When you click on the map, the coordinates are returned in image coordinates. The zoomPoint() method requires the coordinates of the click point to be supplied in image coordinates too. But when viewing the map, you probably want to know the position of the click point in terms of map coordinates. There s no MapScript method to perform this calculation, so you re required to write your own. Lines 009 through 012 set the initial values of some variables. 008 def img2map (width, height, x, y, ext): 009 x = 0 010 y = 0 011 dpp_x = 0 012 dpp_y = 0 Since the width (and height) of the map is known in both pixels (width and height) and map coordinates (from the function parameter passed to ext), and you know the click point coordinates in pixels, you can convert pixels to map coordinates using proportions. Lines 013 through 016 extract the maximum and minimum map coordinates from ext. Lines 017 and 018 determine the number of map units per pixel (e.g., degrees per pixel or meters per pixel). 013 014 015 016 017 018 minx = ext.minx miny = ext.miny maxx = ext.maxx maxy = ext.maxy dpp_x = (maxx-minx)/width # degrees per pixel dpp_y = (maxy-miny)/height

To take this one step further, it s possible to specify absolute positioning for the status: <a4j:status id="stateStatus" startText="Working..." startStyle="background-color: #ffA500; font-weight:bold; position: absolute; left: 520px; top: 1px; width: 100px;"/> Here s what that looks like:

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