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Idle; } Putting the diamond colors back into GameState is handled by the OnNavigatingFrom override, which simply loops through each Diamond object, transferring the color value across to the state object This update ensures that when the page closes, for whatever reason, the GameState always contains the data of the game in play Listing 14 29 shows how this is achieved..

private void standardMove(int keycode) { if(keycode == forwardKey) doMove(FWD); else if(keycode == backKey) doMove(BACK); else if(keycode == leftKey) rotateY(ROT_AMT); else if(keycode == rightKey) rotateY(-ROT_AMT); } // end of standardMove() altMove() employs a similar coding structure to move the viewer up or down, left or right: // global movement vectors private static final Vector3d private static final Vector3d private static final Vector3d private static final Vector3d LEFT = new Vector3d(-MOVE_STEP,0,0); RIGHT = new Vector3d(MOVE_STEP,0,0); UP = new Vector3d(0,MOVE_STEP,0); DOWN = new Vector3d(0,-MOVE_STEP,0);

Row exists for: db.User='jpipes' AND (db.Host='localhost' OR db.Host=") AND db.Db='ToyStore' MySQL denies request No Row exists in db table for: db.User='jpipes' AND db.Host='localhost' AND db.Db='ToyStore'

Listing 14 29. Putting the diamond colors back into GameState protected override void OnNavigatingFrom( System.Windows.Navigation.NavigatingCancelEventArgs e) { base.OnNavigatingFrom(e); // Loop for each diamond, copying the colors back to the GameState object for (int x = 0; x < GamePage.BoardWidth; x++) { for (int y = 0; y < GamePage.BoardWidth; y++) { GameState.SetDiamondColor(x, y, _gameBoard[x, y].Color); } } } Transferring data from and to the GameState object in this way is a convenient mechanism of allowing complex in-game data to be stored away and retrieved when needed. Just be sure to keep the execution of the OnNavigatingFrom code as fast as possible so that it doesn t get terminated prematurely during tombstoning.

Yes db.Select_priv = 'Y'

private void altMove(int keycode) { if(keycode == forwardKey) { upMoves++; doMove(UP); } else if(keycode == backKey) { if (upMoves > 0) { // don't drop below start height upMoves--; doMove(DOWN); } } else if(keycode == leftKey) doMove(LEFT); else if(keycode == rightKey) doMove(RIGHT); } // end of altMove() altMove() shows how it s possible to constrain camera movement: it stops the camera moving below its starting position by keeping a record of its vertical movement in upMoves.

Most of the work for supporting tombstoning is already done by this stage, and in theory the only thing left to do is to add and retrieve the GameState object to and from the PhoneApplicationServiceCurrent dictionary each time the application deactivates and reactivates The code required is just as shown in the Application Life Cycle section earlier in this chapter However, using this in Diamond Lines reveals a limitation with the NET serializer: it is unable to serialize multi-dimensional arrays The normal way to store the diamond colors inside GameState would be as a two-dimensional array, but attempting to put GameState into storage in this way results in an exception There are several ways to manipulate the array so that it can store the game data without needing to be multidimensional, but the approach I decided to use was to change it into an array of arrays.

Row exists in host table for: host.Db='ToyStore' AND host.Host='localhost'

rotateY() applies a y-axis rotation to targetTG: // globals for repeated calculations private Transform3D t3d = new Transform3D(); private Transform3D toRot = new Transform3D();

Each item in the outer array will represent a column across the x axis and will contain an inner array full of the actual colors for that column The declaration of this array inside the GameState class is shown in Listing 14 30 Listing 14 30 Declaring the GameState color array without using multiple dimensions /// <summary> /// The array of colors of the diamonds in play /// </summary> /// <remarks>NET is unable to serialize multi-dimensional arrays, but it is /// able to serialize arrays of arrays This is therefore implemented as an /// array of arrays: the outer array is for the x axis, the inner arrays for /// the y axis</remarks> public int[][] DiamondColors { get; set; } One of the downsides to this structure is that the array cannot be dimensioned within a single call.

Yes Row exists in tables_priv table for: tables_priv.User='jpipes' AND tables_priv.Host='localhost' AND tables_priv.Db='ToyStore' AND FIND_IN_SET('SELECT', tables_priv.table_priv)>0 db.Select_priv = 'Y' AND host.Select_priv = 'Y'

The outer array can be set up easily enough, but the inner arrays must be created individually This is handled in the GameState constructor, as can be seen in Listing 14 31..