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19 Apr 2005 ... NET 2005 - 7.40 Kb ... The EAN - 13 barcode is composed of 13 digits, which are made up of the following sections: the first 2 or 3 digits are the ...

PrintTextString(g, printFont, "FileName:", photo.FileName, ref printArea); PrintTextString(g, printFont, "Caption:", photo.Caption, ref printArea); PrintTextString(g, printFont, "Photographer:", photo.Photographer, ref printArea); PrintTextString(g, printFont, "Notes:", photo.Notes, ref printArea); }

public int CompareTo(float v)

12:

public override bool Equals(object v) public bool Equals(float v) public override int GetHashCode( ) public TypeCode GetTypeCode( ) public static bool IsInfinity(float v) public static bool IsNaN(float v)

The PrintTextString method is implemented by the subsequent steps. Note that our implementation prints the given string across multiple lines if necessary by drawing each word in the text string separately. Also note that the printArea variable is passed by reference. This is required in order to modify the printable area for text strings in the PrintTextString method. Since the RectangleF structure is a value type, it is normally passed by value.

Part I:

IMPLEMENT THE PRINTTEXTSTRING METHOD Action 10 Add a PrintTextString method to the MainForm.cs code window. Result

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The general form of a class declaration that inherits a base class is shown here: class derived-class-name : base-class-name { // body of class } You can specify only one base class for any derived class that you create C# does not support the inheritance of multiple base classes into a single derived class (This differs from C++, in which you can inherit multiple base classes Be aware of this when converting C++ code to C#) You can, however, create a hierarchy of inheritance in which a derived class becomes a base class of another derived class (Of course, no class can be a base class of itself, either directly or indirectly) In all cases, a derived class inherits all of the members of its base class This includes instance variables, methods, properties, and indexers A major advantage of inheritance is that once you have created a base class that defines the attributes common to a set of objects, it can be used to create any number of more specific derived classes Each derived class can precisely tailor its own classification For example, here is another class derived from TwoDShape that encapsulates rectangles:

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// A derived class of TwoDShape for rectangles class Rectangle : TwoDShape { // Return true if the rectangle is square public bool IsSquare() { if(Width == Height) return true; return false; } // Return area of the rectangle public double Area() { return Width * Height; } }

protected void PrintTextString( Graphics g, Font printFont, string name, string text, ref RectangleF printArea) { // Establish some useful shortcuts float leftMargin = printArea.Left; float rightMargin = printArea.Right; float topMargin = printArea.Top; float bottomMargin = printArea.Bottom; float fontHeight = printFont.GetHeight(g); float xPos = printArea.Left; float yPos = topMargin + fontHeight; float spaceWidth = g.MeasureString(" ", printFont).Width; float nameWidth = g.MeasureString(name, printFont).Width; if (!printArea.Contains(xPos + nameWidth, yPos)) { // Does not fit, so abort return; }

The Rectangle class includes TwoDShape and adds the methods IsSquare( ), which determines if the rectangle is square, and Area( ), which computes the area of a rectangle

Create some local variables for the margins of the printable area. Also determine the height of the font and the coordinates where the text should be drawn. Find the width of a space and the name for the text string.

As explained in 8, members of a class are often declared private to prevent their unauthorized use or tampering Inheriting a class does not overrule the private access restriction Thus, even though a derived class includes all of the members of its base class, it cannot access those members of the base class that are private For example, if, as shown here, Width and Height are made private in TwoDShape, then Triangle will not be able to access them:

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EAN13 Barcode Control - CodeProject
16 Sep 2008 ... Demonstrates creating EAN - 13 Barcodes with VB . NET .

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