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"Setting center to the origin."); SortablePoint.Center = new SortablePoint(0, 0); newCenter.Text = SortablePoint.Center.ToString(); } this.Refresh();
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When you use Visual Basic, call static members by using the class name. Using an instance variable to call a static member can confuse other developers. For example, the expression thisPoint.Center could mislead other developers into thinking that the center can be set separately for each SortablePoint instance. 42. Double-click the Add Points button to create the event handler and add this code to draw points on the form. This is the same code you used in 9. 43. Visual Basic 44. Private Sub addPoints_Click(ByVal sender As System.Object, _ 45. ByVal e As System.EventArgs) Handles addPoints.Click 46. 47. 48. 49. 50. 51. 52. 53. 54. 0))) 55. 56. 57. 58. 59. 60. 61. 62. 63. 64. 65. 67. 68. // Visual C# 69. private void addPoints_Click(object sender, System.EventArgs e) { 70. 71. 72. 73. ArrayList points = new ArrayList(); System.Random rgen = new System.Random(); SortablePoint pt; Graphics graph = this.CreateGraphics(); For count = 0 To 249 pt = CType(points(count), SortablePoint) aColor = System.Drawing.Color.FromArgb(25, 25, count) Dim brush As New System.Drawing.SolidBrush(aColor) graph.FillEllipse(brush, pt.X, pt.Y, 10, 10) brush.Dispose() Next points.Sort() Next For count = 0 To 249 points.Add(New SortablePoint(rgen.Next(200), rgen.Next(20 Dim points As New ArrayList() Dim rgen As New System.Random() Dim pt As SortablePoint Dim count As Integer Dim graph As Graphics = Me.CreateGraphics() Dim aColor As Color
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66. End Sub
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74. 75. 76. 0))); 77. 78. 79. 80. 81. 82. 83. ); 84. 85. 86. 87. 88. 89. } Run the application Press F5 to run the application. An example of the output is shown here. You ll want to add some points, enter a new center point, click Set New Center, and finally add some more points. You ll see the light to dark pattern change to reflect the change in the center point. Note that the application doesn t limit the center to within the rectangle of dots. You can also enter a new center that s not correctly formatted for example, (12, abc), so that you can test the exception handling statement. } System.Drawing.SolidBrush brush = new System.Drawing.SolidBrush(color); graph.FillEllipse(brush, pt.X, pt.Y, 10,10); brush.Dispose(); for (int count = 0; count < 250; count++) { pt = (SortablePoint)(points[count]); Color color = System.Drawing.Color.FromArgb(25, 25, count points.Sort(); } for (int count = 0; count < 250; count++) { points.Add(new SortablePoint(rgen.Next(200), rgen.Next(20
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Shared and static members don t have to be public. In 8, Putting It All Together with Components, you created a Card class. Each instance of Card contained an ArrayList filled with Icon instances. If you had a thousand Card instances, you d have a thousand identical instances of the Hearts icon. You can see that each instance doesn t need its own copy, because they are all the same. A shared or static ArrayList will allow the application to maintain only one copy of each icon. A shared or static constructor provides the means for adding the icons to the ArrayList. Implementing the Card Class The Card class in this example will have the same public members as the class you implemented in 8. You ll add a private shared or static SortedList field and a shared or static constructor. To fill the SortedList you ll use some of the shared or static methods of the .NET Framework. Create the project You ll create this project by adding the icon files and Card class source file from 8 to a basic Windows application project. 1. Create a new Windows application project. Name it BetterCard. 2. From the Project menu, click Add Existing Item. Type *.ico in the Filename box and locate and add the four icon files Hearts.ico, Diamonds.ico, Spades.ico, and Clubs.ico to the project. (The files are located in the 08 folder of the companion CD.) In this exercise, an icon will be associated with a Suit enumeration based on the symbolic name of the enumeration value. That is, the Hearts.ico Icon object will be associated with the key Suits.Heart in a SortedList object. Please note that you ll also be using a .NET Framework method that s case sensitive. Therefore, if your Suit enumeration is Clubs, your icon file needs to be named Clubs.ico. You can rename the files before you add them to the project, or you can rename them now by using Solution Explorer. 3. In Solution Explorer, select the four icon files by holding down the Control key as you click each file. 4. In the Properties window, set the Build Action property for the icons to Embedded Resource. You ll use classes in the System.Reflection namespace to retrieve the icons at run time. By using an embedded resource, you don t have to distribute the icon files separately and then find the paths to them at run time. 5. From the Project menu, select Add Existing Item. Browse to the Card.cs or Card.vb source file you created for 8, and add it to your project. You can also find this file on the companion CD in the GamesLibrary folder in either the \08\VisualBasic or \08\VisualCS folder. If you re using Visual C#, locate the namespace declaration in Card.cs and change it to BetterCard. 6. Double-click Card.vb or Card.cs in Solution Explorer to load the Card control into the form designer and the Toolbox. Add the shared and static members In this section, you ll make the SortedList field that holds the icons a shared or static data member instead of an instance member. You ll also use a shared or static constructor to add the icons to the SortedList member. This constructor will make a call to the shared or static method GetExecutingAssembly of the Assembly class. The Assembly instance returned by this call represents your application during run time. The GetManifestResourceStream method of the Assembly class returns an instance of System.IO.Stream that lets you read the icon, as long as you know the name of the icon file in the assembly. The name of the file in the assembly takes the form AssemblyName.IconFileName. You can use the GetName method of the Assembly class to retrieve the assembly name at run time. Conveniently, the Icon class provides a constructor that takes a stream as a parameter. Just pass the Stream instance from the GetManifestResourceStream method to the Icon constructor, and you re done retrieving
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the icon from the assembly. That s a lot of classes and method calls to match up, so let s look at the code to see how it works out. The following code shows the basic process for retrieving the Hearts.ico icon: Visual Basic Dim theAssembly As System.Reflection.Assembly theAssembly = System.Reflection.Assembly.GetExecutingAssembly() Dim assemblyName As String = theAssembly.GetName().Name Dim resourceName As String = assemblyName & ".Hearts.ico" Dim iconStream As System.IO.Stream = _ theAssembly.GetManifestResourceStream(resourceName) Dim theIcon As Icon = new Icon(iconStream) // Visual C# System.Reflection.Assembly assembly; assembly = System.Reflection.Assembly.GetExecutingAssembly(); string assemblyName = assembly.GetName().Name; string resourceName = assemblyName + ".Hearts.ico"; System.IO.Stream iconStream = theAssembly.GetManifestResourceStream(resourceName); Icon theIcon = new Icon(iconStream); 1. In Solution Explorer, right-click Card.cs or Card.vb and click View Code on the shortcut menu. 2. Modify the Card class default constructor the constructor that doesn t take arguments to delete the calls to add icons to the m_icons SortedList. If you re using Visual Basic you ll find the constructor in the region labeled Windows Form Designer Generated Code. The constructor after modification is shown here: 3. 4. 5. 6. 7. 8. 9. 10. // Visual C# 11. public Card() 12. { 13. 14. // This call is required by the Windows.Forms Form Designer. InitializeComponent(); Visual Basic Public Sub New() MyBase.New() This call is required by the Windows Form Designer. InitializeComponent() End Sub
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} 15. If you re using Visual Basic, add an Imports statement at the top of the source file for the System.ComponentModel namespace. The Card class you defined in 8 was part of a Class Library project, and the System. Component namespace was a project-wide import. The namespace isn t imported by default in a Visual Basic Windows application and must be added. If you re using Visual C#, the using statement for System.ComponentModel is already in the Card.cs file.
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