.NET/Java PDF, Tiff, Barcode SDK Library

Figure 7-13. You can draw text in many different ways. First of all, you need to create a QPixmap to draw to and a QPainter to draw with. You also have to fill the pixmap with white and set the pen of the painter to be black: QPixmap pixmap( 200, 330 ); pixmap.fill( Qt::white ); QPainter painter( &pixmap ); painter.setPen( Qt::black ); Draw the text at the top of the figure, which originates at a QPoint. The following source code shows you the drawText call is used. The following drawLine class simply marks the point used with a cross (you can see this cross in Figure 7-13 on the left of the top text). QPoint point = QPoint( 10, 20 ); painter.drawText( point, "You can draw text from a point..." ); painter.drawLine( point+QPoint(-5, 0), point+QPoint(5, 0) ); painter.drawLine( point+QPoint(0, -5), point+QPoint(0, 5) ); Drawing text from a point has its advantages it is an easy way to get text onto the screen. If you need more control, you can draw text in a rectangle, which means that you can align the text to the right, left, or center horizontally (also at the top, bottom, or center vertically). The enumerations used for alignment are summarized in this list: Qt::AlignLeft: Align left Qt::AlignRight: Align right

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(As you saw in Example 10-33, a single d means something else: it shows the whole date, in short form.) Other useful formatting characters include:

As with the numeric formats, you can also include string literals, escaping special characters in the usual way.

Now that we know how to control the formatting of various types when we convert them to a string, let s take a step aside for a moment to look at converting back. If we ve got a string, how do we convert that to a numeric type, for instance Probably the easiest way is to use the static methods on the Convert class, as Example 10-39 shows.

int converted = Convert.ToInt32("35");

Qt::AlignHCenter: Center-align horizontally Qt::AlignTop: Align at the top Qt::AlignBottom: Align at the bottom Qt::AlignVCenter: Center-align vertically Qt::AlignCenter: Center-align both vertically and horizontally Another benefit of drawing the text inside a rectangle is that the text is clipped to the rectangle, which means you can limit the area used by the text. The following source code draws a text centered in a rectangle: QRect rect = QRect(10, 30, 180, 20); painter.drawText( rect, Qt::AlignCenter, "...or you can draw it inside a rectangle." ); painter.drawRect( rect ); Because you can limit the text to a rectangle, you also need to be able to determine how much space the text uses. Start by translating the rectangle to a new position; you ll get the standard QFont from the QApplication object. Using the font, set a pixelSize to fit the rectangle before drawing text on either side of the rectangle.

that uses these controls to bind controls to the error message property and to clear error methods on the PageRequestManager control. You can also design this HTML using the Visual Studio 2005 IDE. When you mouse over the ScriptManager control in the page designer, you ll see a small right-pointing arrow on its top-right corner (see Figure 6-8).

This class also supports numeric conversions from a variety of different bases (specifically 2, 8, 10, and 16), shown in Example 10-40.

int converted = Convert.ToInt32("35", 16); int converted = Convert.ToInt32("0xFF", 16);

Although we get to specify the base as a number, only binary, octal, decimal, and hexadecimal are actually supported. If you request any other base (e.g., 7) the method will throw an ArgumentException. What happens if we pass a string that doesn t represent an instance of the type to which we want to convert, as Example 10-41 does

Because you re painting to a QPixmap, use the font from the QApplication. If you were painting to a Tip

double converted = Convert.ToDouble("Well, what do you think ");

As this string cannot be converted to a double, we see a FormatException. Throwing (and catching) exceptions is a relatively expensive operation, and sometimes we want to try a particular conversion, then, if it fails, try another. We d rather not pay for the exception if we don t have to. Fortunately, the individual numeric types (and DateTime) give us the means to do this. Instead of using Convert, we can use the various TryParse methods they provide. Rather than returning the parsed value, it returns a bool which indicates whether the parse was successful. The parsed value is retrieved via an out parameter. Example 10-42 shows that in use.

int parsed; if (!int.TryParse("Well, how about that", out parsed)) { Console.WriteLine("That didn't parse"); }

QWidget or to a QPixmap used in a specific widget, it would be more logical to get the font from the widget.

For each of the TryParse methods, there is an equivalent Parse, which throws a FormatException on failure and returns the parsed value on success. For many applications, you can use these as an alternative to the Convert methods. Some parse methods can also offer you additional control over the process. Date Time.ParseExact, for example, allows you to provide an exact format specification for the date/time string, as Example 10-43 shows.

If you click this arrow, the ScriptManager Tasks Assistant will appear. From this assistant, you can configure or remove the error template and enable partial rendering (see Figure 6-9).

DateTime dt = DateTime.ParseExact("12^04^2008","dd^MM^yyyy",CultureInfo.CurrentCulture);

This can be useful if you expect a nonstandard format for your string, coming from a legacy system, perhaps.

We ll add the method shown in Example 3-41 to the Plane class. Because it is marked static, it s not associated with a single Plane, and will have no implicit this argument. Instead, we pass in both of the Plane objects we want to look at as explicit arguments, to emphasize the fact that neither of the objects is in any way more significant than the other in this calculation.