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A MAC transits frames that do not originate or terminate at that MAC There are two types of MAC transit queuing designs: single transit queue and dual transit queue The single transit queue design places all transit traffic into a primary transit queue (PTQ) The dual transit queue design places classA transit traffic into a higher-precedence primary transit queue, and classB and classC transit traffic into a lower-precedence secondary transit queue (STQ) Neither path supports preemption of either the transit or ingress frames Once a frame has begun transmission, its transmission cannot be interrupted by the transmission of another frame Single and dual transit queue MAC can interoperate in the same ring

private void OnSizeChanged(object sender, SizeChangedEventArgs e) { Update(); }

wherex( ), wherey( )

void highvideo(void)

The prototype for highvideo( ) is in <conioh> After a call to highvideo( ), characters written to the screen are displayed in high-intensity video

If you re following along, go ahead and run. The application should look just like the direct rendering version shown in figure 14.11, or for that matter, the Shapes version from figure 14.8. But, this version is much lighter-weight than the Shapes version, which would matter more if our display was more complex. Also, unlike the directrendering version, we can do things like hit testing, which we ll talk about in the next section.

Transmit Operation The selection of the frame to be transmitted depends on the transit path implementation For single transit queue implementations the intent is to always

This fragment turns on high-intensity output:

highvideo();

14.4.2 Hit testing with Visuals Shapes are Visuals, but Visuals are not Shapes. (We re going for the profound statement of the year with that one.) The point, though, is that the ability to catch events that exists on Shapes isn t available on our DrawingVisuals, but Visuals do support a hit-test mechanism that can tell us whether they ve been clicked on or not. This is a much lower-level mechanism, but it is, in fact, the mechanism that Shapes use to expose events. Our ColumnGraphVisualCtrl is a FrameworkElement, so we can catch the MouseDown event on that class. Rather than subscribing to the event, we can override the OnMouseDown() method on the class to save a step. Then, in that handler, we can use the low-level hit testing to see which (if any) of our Visual children was hit. Listing 14.11 shows the implementation of the OnMouseDown method.

lowvideo( ), normvideo( )

Resilient Packet Ring (RPR)

void insline(void)

protected override void OnMouseDown(MouseButtonEventArgs e) { Checks for double-click if (e.ClickCount == 2) Converts point to { proper coordinates Point pt = e.GetPosition(this);

The prototype for insline( ) is in <conioh> The insline( ) function inserts a blank line at the current cursor position All lines below the cursor move down This function operates relative to the current text window

empty the PTQ before client frame transmissions This is achieved by assigning a strict higher priority to the transit traffic (regardless of its class of service) than to any local added traffic For dual transit queue implementations the intent is to always empty the PTQ before client frame transmissions, but to allow the STQ to fill somewhat while adding client frame transmissions A dual transit queue MAC implementation is more complicated, but it has the advantages of supporting the more efficient subclassA1, and safely delivering higher amounts of ring traffic since the low priority transit traffic can not preempt the local high priority (classA) traffic

18:

HitTestResult result = VisualTreeHelper.HitTest(this, pt); if (result != null)

The following program illustrates the use of insline( )

#include <conioh> int main(void) { register int i; THE C++ BUILDER FUNCTION LIBRARY clrscr(); for(i=1; i<24; i++) { gotoxy(1, i); cprintf("This is line %d\n\r", i); } getche(); gotoxy(1, 10); insline(); getch(); return 0; }

There are four types of RPR frames:

{ foreach (NameValuePair nvp in dataPoints) { if (nvp.Tag == result.VisualHit) { MessageBox.Show("Name: " + nvp.Name + ", Value: " + nvp.Value.ToString()); break; } } } } }

delline( )

void lowvideo(void)