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Figure 24-2. A flawed drawing program Overall, the Shape control has three key characteristics: It provides a ShapeType enumeration that defines the shapes it can represent. The programmer chooses a shape by setting the Shape property. (Another option would be to create a separate class for each shape type. However, in this example, the shape drawing is quite simple, so encapsulating it in a single class is still practical.) It uses a private member variable that references a GraphicsPath object with the associated shape. Whenever the Shape property is modified, the control creates a new GraphicsPath and adds the appropriate shape to it. It then sets the control s Region property, effectively setting the clipping bounds to match the shape. The painting logic is the easiest part. It simply uses the FillPath() method to draw the shape and the DrawPath() method to outline it. Here s the complete Shape class code: Public Class Shape Inherits System.Windows.Forms.Control ' The types of shapes supported by this control. Public Enum ShapeType Rectangle Ellipse Triangle End Enum

Figure 15-31. Creating a new data source for the GridView control After you have done this, the screen shown in Figure 15-32 will appear. You will be able to choose a data source type. Select the Database icon, and specify an ID for the data source. You can use any name you wish.

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' The current shape. Private shape As ShapeType = ShapeType.Rectangle Private path As GraphicsPath Public Property Type() As ShapeType Get Return shape End Get Set(ByVal value As ShapeType) shape = value RefreshPath() Me.Invalidate() End Set End Property ' Create the corresponding GraphicsPath for the shape, and apply ' it to the control by setting the Region property. Private Sub RefreshPath() If path IsNot Nothing Then path.Dispose() path = New GraphicsPath() Select Case shape Case ShapeType.Rectangle path.AddRectangle(Me.ClientRectangle) Case ShapeType.Ellipse path.AddEllipse(Me.ClientRectangle) Case ShapeType.Triangle Dim pt1 As Point = New Point(Me.Width / 2, 0) Dim pt2 As Point = New Point(0, Me.Height) Dim pt3 As Point = New Point(Me.Width, Me.Height) path.AddPolygon(New Point(){pt1, pt2, pt3}) End Select Me.Region = New Region(path) End Sub Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs) MyBase.OnPaint(e) If path IsNot Nothing Then Dim shapeBrush As New SolidBrush(Me.BackColor) Dim shapePen As New Pen(Me.ForeColor, 5) e.Graphics.SmoothingMode = SmoothingMode.AntiAlias e.Graphics.FillPath(shapeBrush, path) e.Graphics.DrawPath(shapePen, path) shapePen.Dispose() shapeBrush.Dispose()

Figure 15-32. Creating the Oracle data source After you click the OK button, you will see the window shown in Figure 15-33. This window allows you to pick the database object to use as a data source. Let s try to display the list of products from the Products table. You probably don t want to display all the columns, so check only the first four columns. Take note that you can also define the WHERE and ORDER BY clauses of the SQL statement using the buttons on the right.

End If End Sub Protected Overrides Sub OnResize(ByVal e As System.EventArgs) MyBase.OnResize(e) RefreshPath() Me.Invalidate() End Sub End Class As you can see, there s no need to code properties like BackColor, ForeColor, Location, or Size, because these members are all built into the base Control class. The code emphasizes that it s using built-in members by using the Me keyword (as in this.BackColor rather than just BackColor).

Listing 3-4. Full-Screen Example background_image_filename = 'sushiplate.jpg' import pygame from pygame.locals import * from sys import exit pygame.init() screen = pygame.display.set_mode((640, 480), 0, 32) background = pygame.image.load(background_image_filename).convert() Fullscreen = False while True: for event in pygame.event.get(): if event.type == QUIT: exit() if event.type == KEYDOWN: if event.key == K_f: Fullscreen = not Fullscreen if Fullscreen: screen = pygame.display.set_mode((640, 480), FULLSCREEN, 32) else: screen = pygame.display.set_mode((640, 480), 0, 32) screen.blit(background, (0,0)) pygame.display.update()

Tip To avoid re-creating the brushes and pens each time the shape is drawn, you could create the brush

Figure 15-33. Configuring the SQL SELECT statement for the data source After you click the Next button to proceed, you can observe that Visual Studio has done the binding between the data source and the grid. The names of the columns you have selected will appear in the header of the grid, as shown in Figure 15-34.

and pen once, and store them in member variables. You would then need to check to make sure the color hasn t changed before you reuse the pen and brush (or react to the ForeColorChanged and BackColorChanged events).

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