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Each time the loop iterates, it attempts to FETCH, and then immediately checks the finished variable to see if it was changed by the condition being raised. If the finished variable wasn t changed by an activation of the HANDLER statement, the loop continues. This logic is repeated for each iteration through the loop: get_city: LOOP FETCH city_cur INTO city_name; IF finished THEN LEAVE get_city; END IF; SET list = CONCAT(list,", ",city_name); END LOOP get_city; If the FETCH can t get a row, a NOT FOUND condition is raised. This condition is handled by the handler, which sets finished to 1. The IF finished THEN statement will then be satisfied, and the loop will exit on the LEAVE statement. A loop label, get_city in this example, is required to use the LEAVE statement. (See 9 for details on flow constructs, including the LOOP, IF... THEN, and LEAVE statements.)

Figure 12 6. Polylines using each of the available StrokeLineJoin properties Just like Lines, PolyLines also allow their start and end to be capped if needed. The final shape is the Polygon, which is configured in exactly the same way as the Polyline, but it creates an enclosed region (the end point is automatically joined back to the start point). It supports all the same features as the Polyline, except for the stroke start and end line caps because the Polygon doesn t have any start or end point. What it provides instead is the ability to set its Fill property, resulting in a solid interior to the rendered shape. Any of the available brushes can be used for this purpose. Listing 12 5 shows the XAML for a filled Polygon. Listing 12 5. Creating a Polygon <Polygon Stroke="SkyBlue" StrokeThickness="15" Fill="Gold" Points="100,50 200,100 150,150 200,200 100,250 " /> The resulting shape is shown in Figure 12 7.

withinRange() employs hardwired numerical ranges to determine whether a rotation should be carried out. The intended rotation is added to the current joint angle to see whether the range is exceeded: private boolean withinRange(int rotType, int degAngle) { int nextAngle; if (rotType == X_JOINT) { nextAngle = xCurrAngle + degAngle; return ((nextAngle >= -45) && (nextAngle <= 45)); } else if (rotType == Y_JOINT) { nextAngle = yCurrAngle + degAngle; return ((nextAngle >= -45) && (nextAngle <= 45)); } else if (rotType == Z_JOINT) {

Caution You may be tempted to use the REPEAT statement for your iterations, but be careful. The REPEAT

For games that require a little less graphical grunt, Silverlight is a very capable environment for game development. Ideal for puzzle games and other games that don t require dozens of constantly moving objects, Silverlight s graphical capabilities still provide features such as transparency, scaling, and rotation of graphics all of which are very useful for games. Games that require a rich graphical user interface (GUI) are likely to be obvious candidates for Silverlight. Its page design capabilities are highly flexible, offering everything from labels to fully working web browser controls unlike XNA, which has no built-in user interface features at all and requires everything to be manually programmed. As with XNA, the device features are all available in Silverlight, including the multitouch display and accelerometer. Unlike XNA, Silverlight is event-driven, so your coding model will generally be responding to event calls rather than polling the device state. Silverlight is also much better at displaying text than XNA. Whereas XNA relies on bitmap representations of fonts (which become blocky and are distorted if they are drawn too large), Silverlight uses vector-based fonts, allowing them to be zoomed without any such distortion. A nice side effect of developing for Silverlight is that games

nextAngle = zCurrAngle + degAngle; return ((nextAngle >= -90) && (nextAngle <= 90)); } else if (rotType == FING_JOINT) { nextAngle = fingCurrAngle + degAngle; return ((nextAngle >= 0) && (nextAngle <= 20)); } System.out.println("Did not recognise rotation type: " + rotType); return false; } // end of withinRange()

mechanism is problematic because it doesn t allow you to check to see if the FETCH caused the reset of the finished variable until the bottom of the loop. If you don t check if the loop should exit immediately after the FETCH, you will execute statements, even though the end of the resultset has been reached.