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In some cases, it just doesn t make sense to repaint the entire window when you need to update only a portion of the display. One example is a drawing program. Consider a simple example program that allows the user to draw squares. Every time the user clicks on an area of the form, a new square is inserted (see Figure 7-24).

You can now write the full code for the enqueue function as shown in Listing 9-6. For multipleconsumer queues, you are required to define the sender ID. You can set it to any name you wish. Listing 9-6. Recipient-Specific Enqueuing

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Figure 7-24. A square-painting program To make sure this painting program keeps working even if the form is resized or minimized, all the painting is performed in the Paint event handler. When the user clicks with the mouse, a new square is created but not drawn. Instead, a rectangle object is added to a form-level collection, so it can be tracked, and the form is invalidated. Not only does this offer better performance, it s also a conceptually solid design, because you re separating your data (the square objects) from their visual representation (the drawing code). ' Store the squares that are painted on the form. Private squares As New List(Of Rectangle)() Private Sub DrawSquare_MouseDown(ByVal sender As Object, _ ByVal e As System.Windows.Forms.MouseEventArgs) _ Handles MyBase.MouseDown ' Define a new square based on where the user clicked. Dim square As New Rectangle(e.X, e.Y, 20, 20) squares.Add(square) ' Request a repaint. Invalidate() End Sub The painting logic then takes over, iterating through the collection, and drawing each rectangle. The number of squares that is currently being displayed is also written to a status bar at the end of this operation. Private Sub DrawSquare_Paint(ByVal sender As Object, _ ByVal e As System.Windows.Forms.PaintEventArgs) _ Handles MyBase.Paint

Dim squarePen As New Pen(ColorRed, 10) For Each square As Rectangle In squares eGraphicsDrawRectangle(squarePen, square) Next squarePenDispose() lblCountText = " " & squaresCount & " squares" End Sub The problem with this code is that every time a rectangle is created, the entire form is redrawn This causes noticeable screen flicker as the number of squares advances beyond 100 You can try this out using the sample code for this chapter There are two ways that you can remedy this problem The fastest solution is to draw the square in two places: in the Paint logic and the MouseDown event handling code With this approach, the MouseDown event handler does not need to invalidate the form It draws the square directly, and stores enough information about the new rectangle for it to be successfully repainted if the window is minimized and restored.

def __init__(self, position, color): self.position = position self.color = color # Cube information num_faces = 6 vertices = [ (0.0, (1.0, (1.0, (0.0, (0.0, (1.0, (1.0, (0.0, 0.0, 0.0, 1.0, 1.0, 0.0, 0.0, 1.0, 1.0, 1.0), 1.0), 1.0), 1.0), 0.0), 0.0), 0.0), 0.0) ] # # # # # # front back right left top bottom # # # # # # front back right left top bottom

private void btnEnqueueMCQ_Click(object sender, EventArgs e)

The potential drawback is that the code becomes significantly more tangled, especially if the drawing logic is complicated To avoid writing the same code twice, you should separate the drawing logic into a separate subroutine that accepts a Graphics object and the item to draw The following code snippet shows how this technique would work with the simple square painting program: ' Paint a square in response to a mouse click Private Sub DrawSquare_MouseDown(ByVal sender As Object, _ ByVal e As SystemWindowsFormsMouseEventArgs) _ Handles MyBaseMouseDown Dim square As New Rectangle(eX, eY, 20, 20) squaresAdd(square) Dim g As Graphics = MeCreateGraphics() DrawRectangle(square, g) gDispose() End SUb ' Paint all the squares when the form needs to be refreshed ' in response to the Paint event Private Sub DrawSquare_Paint(ByVal sender As Object, _ ByVal e As SystemWindowsFormsPaintEventArgs) _ Handles MyBase.

Paint For Each square As Rectangle In squares DrawRectangle(square, eGraphics) Next End Sub ' This procedure performs the actual drawing, and is called by ' DrawSquare_MouseDown and DrawSquare_Paint..

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