ASP.NET PDF Viewer using C#, VB/NET

This didn t end up as expected; instead, the text is clipped at the bottom. The pixel size of a font only defines the size above the base line on which all characters are drawn. rect.translate( 0, 30 ); QFont font = QApplication::font(); font.setPixelSize( rect.height() ); painter.setFont( font ); painter.drawText( rect, Qt::AlignRight, "Right." ); painter.drawText( rect, Qt::AlignLeft, "Left." ); painter.drawRect( rect ); To really be able to fit the text into a rectangle, use the QFontMetrics class to get accurate measures of the text. The font metrics class can be used to determine the width of a given text as well as its height. The height, however, is not dependent on any particular text; it s defined entirely by the font. The following code adjusts the height of the rectangle used to keep the text before drawing the text. Refer to Figure 7-13: the text fits beautifully this time around.

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public static { double x1 double x2 double y1 double y2 double z1 double z2 bool TooClose(Plane first, Plane second, double minimumMiles) = = = = = = first.Position.Distance * Math.Cos(first.Position.Angle); second.Position.Distance * Math.Cos(second.Position.Angle); first.Position.Distance * Math.Sin(first.Position.Angle); second.Position.Distance * Math.Sin(second.Position.Angle); first.Position.Altitude / feetPerMile; second.Position.Altitude / feetPerMile;

double dx = x1 - x2; double dy = y1 - y2; double dz = z1 - z2; double distanceSquared = dx * dx + dy * dy + dz * dz; double minimumSquared = minimumMiles * minimumMiles; return distanceSquared < minimumSquared;

} private const double feetPerMile = 5280;

recttranslate( 0, rectheight()+10 ); rectsetHeight( QFontMetrics( font )height() ); painterdrawText( rect, Qt::AlignRight, "Right" ); painterdrawText( rect, Qt::AlignLeft, "Left" ); painterdrawRect( rect ); Using drawText to paint text has its limitations For instance, parts of the text can t be formatted, nor can it be divided into paragraphs You can use the QTextDocument class to draw formatted text (as shown in the following source code) Drawing text with a text document is slightly more complicated than using drawText directly Start by creating a QTextDocument object that you initialize with HTML-formatted text using setHTML Set up the rectangle in which you ll draw the text Translate it to a new position below the last drawn text and then adjust the height to allow for more text The rectangle is then used to set the width of the text document using setTextWidth.

We ve seen plenty of function declarations like this before, but we ll quickly recap its anatomy. This one returns a bool to indicate whether we re safe ( true) or not (false). In its parameter list, we have the references to the two Plane objects, and a double for the margin of error (in miles).

Figure 6-9. The ScriptManager Tasks Assistant when an <ErrorTemplate> element is already configured

Because there s no implicit this parameter, any attempt to use nonstatic members of the class without going through an argument or variable such as first and second in Example 3-41 will cause an error. This often catches people out when learning C#. They try adding a method to the Program class of a new program, and they forget to mark it as static (or don t realize that they need to), and then are surprised by the error they get when attempting to call it from Main. Main is a static method, and like any static method, it cannot use nonstatic members of its containing type unless you provide it with an instance.

Example 3-41 performs some calculations to work out how close the planes are. The details aren t particularly important here we re more interested in how this uses C# methods. But just for completeness, the method converts the position into Cartesian coordinates, and then calculates the sum of the squares of the differences of the coordinates in all three dimensions, which will give us the square of the distance between the two planes. We could calculate the actual distance by taking the square root, but since we only want to know whether or not we re too close, we can just compare with the minimum distance squared. (Computers are much faster at squaring than they are at calculating square roots, so given that we could do it either way, we may as well avoid the square root.)