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A line is the most basic shape that you can draw using a painter. A line that goes between two points is drawn by using the drawLine(QPoint,QPoint) method. If you want to join more points in one go, you can use the drawPolyline(QPoint*, int) method. The drawLines(QVector<QPoint>) method is also used to draw several lines at once, but the lines aren t continuous. The three methods are used in Listing 7-3 and the result is shown in Figure 7-4. In the listing, a pixmap is created and filled with white before a painter is created, and the pen is configured to draw black lines. The two vectors polyPoints and linePoints are initialized, where linePoints is calculated from shifting the polyPoints points 80 pixels to the right. You can shift the points by adding an offset QPoint to each QPoint, which adds the x and y values together separately.

One really useful option for use with easy_install is --always-unzip. This forces Easy Install to extract all files from the egg packages so that you can browse their source files on the filesystem to see how the packages they contain actually work. That s very handy if you are an inquisitive developer!

12. MIME stands for Multipurpose Internet Mail Extensions. The concept of MIME media types was originally devised to specify the content format and encoding of multimedia (non-text) e-mails, but is now used to specify data encodings in a variety of protocols and applications.

QPolygon class also provides methods for moving all the points around at once, as well as calculating

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If you try to install Pylons using easy_install and get a message such as error: Download error: (10060, 'Operation timed out'), it might be because your computer is behind an HTTP proxy and so easy_install cannot download the files it needs. For easy_install to be able to download the files, you need to tell it where the proxy is. You can do this by setting the HTTP_PROXY environment variable. On Linux, you would type this: $ export HTTP_PROXY="http://yourproxy.com:port" or if you need proxy authentication, you would type this: $ export HTTP_PROXY="http://user:password@yourproxy.com:port" On Windows you would set the following: > set HTTP_PROXY=http://your.proxy.com:yourPort You should then be able to run easy_install Pylons again, and this time the program will be able to find the files. See the next section for installing Pylons offline if you still have difficulties.

containing an action token is consistent with the session cookie. Since a malicious page would not be able to guess the correct value for this parameter, it would not be able to make a request that the application responds to and returns any data. In essence, we have complemented session cookie based request authentication (which the browser always supplies automatically) with request authentication based on a request parameter. We note that the term action token is not quite accurate in this case, because the requests in question do not necessarily result in an action or state change on the server. However, since we do need to protect state-changing Ajax requests against XSRF, we may as well use just one single token and validation mechanism. If GET requests are used, the action token is transferred in the URL as a query parameter, which brings up the concerns regarding leakage and logging discussed in Section 10.3.4. We should whenever possible use POST requests for that reason (made, for example, using XmlHttpRequest). However, the risk of leakage is smaller in this case because the returned document is a JavaScript document and not an HTML document that may contain references to third-party resources.

Instead of taking a value, it has a selected_values argument and an options argument: selected_values: A string or list of strings or integers giving the value(s) that should be preselected. options: An iterable of (value, label) pairs. The value is what is returned to the application if this option is chosen; the label is what is shown in the form. You can also pass an iterable of strings, in which case the labels will be identical to the values. If you are used to the select() helper from an earlier version of WebHelpers, you might expect to be able to use options_for_select(). This has been deprecated and is not available in Pylons 0.9.7. Instead, you just pass in the list of tuples directly via options. You ll also notice that the order of items in the tuple is reversed. options_for_select() expects arguments in the form (label, value), but this isn t how most Python objects are generated. The following shows select() in action: >>> select("currency", "$", [["$", "Dollar"], ["DKK", "Kroner"]]) literal(u'<select name="currency">\n<option selected="selected" value="$"> Dollar</option>\n <option value="DKK">Kroner</option>\n</select>') >>> select("cc", "MasterCard", [ "VISA", "MasterCard" ], id="cc", class_="blue") literal(u'<select class="blue" id="cc" name="cc">\n <option value="VISA">VISA</option>\n<option selected="selected" value="MasterCard">MasterCard</option>\n</select>') >>> select("cc", ["VISA", "Discover"], [ "VISA", "MasterCard", "Discover" ]) literal(u'<select name="cc">\n <option selected="selected" value="VISA">VISA</option>\n <option value="MasterCard">MasterCard</option>\n <option selected="selected" value="Discover">Discover</option>\n</select>')

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