Assignment 306 moving and handling handout

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Assignment 306 moving and handling handout

DigHT Using Arrays: The stack can be found at http: An array is an indispensable tool for managing the data in any board game that uses a grid, like chess, checkers, and crossword games like Scrabble.

The grid layout of the game board makes a two-dimensional array the natural choice for data storage and keeping track of moves and the current game state.

It is an important principle of programming to keep your data storage separate from your visual display and user interface. In the case of the chess game, you should create a data storage structure that will keep track of the current position of all the game pieces.

From that data storage you can then update the visual display to show the user the current state of the game. As the user makes a move on the game board, the underlying data store should be updated to reflect the move, and the visual display should be updated based on the new state of the data store.

To illustrate this idea, consider a blank chess board.

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It consists of 8 columns and 8 rows of squares of alternating colors. Using standard chess board notation, we'll label the columns with the letters A — H and the rows with numbers 1 — 8, beginning from the lower left-hand corner: At any point in the game we need to know the state of any square on the board.

A two-dimensional array can easily store this information for all 64 squares: Here we are using common abbreviations for chess pieces: The visual updating of the board is done as a separate step using whatever mechanism we want.

Assignment 306 moving and handling handout

As you do so, make an effort to understand what is going on in each handler. For instance, the createBeginningSetup handler creates a global array that assigns the proper starting squares for all of the chess pieces.

If you are unsure how a chessboard is supposed to be set up, there are many web sites that will explain it and show diagrams. The names of the other handlers are descriptive of what each handler does—clearBoard empties all the elements of the board array while keeping the array structure intact; resetGame sets all of the game pieces back to the starting positions, etc.

The lone exception is the updateBoard handler, which examines the chess board array and updates the visual layout of the chess board to match the array.

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Create three buttons and two fields alongside the chess board grid that will allow you to test the handlers you've just typed in.

See illustration at right. What the buttons should do are described by their labels. The two text fields are for entering space names for the starting and ending spaces, respectively. You'll refer to these two fields when invoking the makeMove handler from the "Move Piece" button.

Part II — User interface handlers Now that the chess board array handling is set up and working, we need to turn our attention to creating the user interface for moving pieces around the board. Figure out a method for moving chess pieces from one square to another by "dragging" them with a mouse.

This of course would correspond to dragging them with a finger on a mobile device touch screen. Be sure to update the currentState array, then to ensure the visual display represents the contents of the array. As a guide to how to program these moves, consider that you'll have to come up with the following: Why a mouseRelease handler instead of a mouseUp handler, you may wonder?

Remember that a mouseUp message is sent only if the mouse is released within the same control as it was clicked down in; otherwise a mouseRelease message is sent instead. In the case of moving a chess piece, a move always originates in one square remember, squares in our grid are button objects of the grid and ends in another square.

You will also need a clear, visual way of informing the user that he has grabbed a piece and is moving it from one space to another.Handling Academic Dishonesty.

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Assignment 306 moving and handling handout

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