ASP.NET Web PDF Document Viewer/Editor Control Library

Next, you will create your own .js file that includes the code for a namespace that contains a class definition for a car. As you will see in the next sections, Atlas brings object-oriented programming to JavaScript, providing namespaces, inheritance, interfaces, and other goodies. If you are familiar with using object orientation, the advantages are obvious. If you aren t, then the next sections, which show how namespaces, inheritance, and so on, work with JavaScript, should help you understand how they make your code simpler to write, debug, and understand. To create this file, right-click the project within Solution Explorer, and select Add New Item (see Figure 3-3). In the ensuing dialog box, you then select Jscript File and name it. In this case I have called it AtlasBook.js (see Figure 3-4). You can of course call it anything you like, but this is the name I ll use in this book s examples.

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Listing 7-6 shows how to draw ellipses and arcs (the results are shown in Figure 7-12). As you can see, the proportions of the shapes are changed, and the rightmost ellipse and arc are actually circular (the width equals the height). As the source code shows, it is possible to specify the rectangle in which the ellipse or arc is drawn by using coordinates directly or by passing a QRect value to the drawing method. When specifying the angles, I multiplied the different values by 16 to convert the value from actual degrees to the values that Qt expects. Listing 7-6. Drawing ellipses and arcs QPixmap pixmap( 200, 190 ); pixmap.fill( Qt::white ); QPainter painter( &pixmap ); painter.setPen( Qt::black ); painter.drawEllipse( painter.drawEllipse( painter.drawEllipse( painter.drawEllipse( painter.drawArc( painter.drawArc( painter.drawArc( painter.drawArc( 10, 10, 10, 30, 10, 20, 60, 10, 40, QRect( 110, 80 ); 80 ); 80 ); 10, 80, 80 ) ); 30*16, 45*16, 60*16, 80, 80 240*16 ); 200*16 ); 160*16 ); ), 75*16, 120*16 );

2001-12-24T13:14:15.0160000

(If you use a DateTimeOffset, this last format will add the time zone on the end; for example, +01:00 would indicate that the time is from a zone one hour ahead of UTC.) This round-trip format is sortable using standard string precedence rules. Another format with that characteristic is the universal sortable form, shown in Example 10-37. This converts from local time to UTC before doing the format.

DateTime time = new DateTime(2001, 12, 24, 13, 14, 15, 16); Console.WriteLine(time.ToString("u"));

Because I am currently in the GMT time zone, and daylight saving is not in operation, I am at an offset of zero from UTC, so no apparent conversion takes place. But note the suffix Z which indicates a UTC time:

10, 100, 10, 80, 30, 100, 20, 80, 60, 100, 40, 80, QRect( 110, 100,

Dealing with dates and times is notoriously difficult, especially if you have to manage multiple time zones in a single application. There is no silver bullet solution. Even using DateTimeOffset internally and converting to local time for output is not necessarily a complete solution. You must beware of hidden problems like times that don t exist (because we skipped forward an hour when we applied daylight saving time), or exist twice (because we skipped back an hour when we left daylight saving time).

As with the numeric conversions, you also have the option of custom format strings. The key components are:

d: day M: month (note that this is uppercase to distinguish it from m for minute) y: year h: hour (12-hour format) H: hour (24-hour format) m: minute s: seconds f: fractions of a second

Qt offers several possible ways to draw text (see Figure 7-13 for some examples). Refer to the figure while you work your way through the code used to create it.

You can now add the code that implements the Car class. When you use Visual Studio 2005 to create and edit JavaScript code, you get syntax coloring to make your code easier to understand and maintain. Figure 3-5 shows the Car class code in the editor.

The / character will be substituted with the appropriate date separator for your locale, and : with the time separator. You can repeat the substitution character to obtain shorter/longer forms of the relevant part of the date or time. For example, you can format the day part like Example 10-38 does.

DateTime time = new DateTime(2001, 12, 24, 13, 14, 15, 16); Console.WriteLine(time.ToString("dddd")); Console.WriteLine(time.ToString("ddd")); Console.WriteLine(time.ToString("dd"));

This will produce: