Flash MX 2004 Games : Art to ActionScript

Flash MX 2004 Games
7 eval(name).gotoAndStop(1);
8 }
9 }
10 curGo = 0;
11 playersMove();
12 }
Listing 16.3
The initialization function makes use of one of two functions that swap the current player and
update the move counter ‘curGo’. Two movie clips use the variable ‘whoseGo’ to check for the
next player; they are visually the lozenges behind the word ‘Computer’ and ‘Player’.
1 function playersMove(){
2 computerHL.gotoAndStop(1);
3 playerHL.gotoAndStop(2);
4 whoseGo = PLAYER;
5 curGo++;
6 }
7
8 function computerMove(){
9 computerHL.gotoAndStop(2);
10 playerHL.gotoAndStop(1);
11 whoseGo = COMPUTER;
12 curGo++;
13 }
Listing 16.4
Tracking the player’s move
A player’s move is legal if the square they clicked is empty, if in one of eight directions stemming
from this square there is an opponent’s piece and if continuing in the same direction there is a
player’s piece. This checking is all done using the ‘checkBoard’ function. Either the player or the
computer can call this function; the caller is contained in the variable ‘piece’. The function calls a
further function ‘scanBoard’ a total of eight times. For each call the direction that is being scanned
is contained in the fifth and sixth parameters. Parameters one and two contain the starting square
and parameters three and four the current player and opponent. For each direction the array ‘flip’
is set to either true or false, and a variable ‘legal’ dictates whether this is an acceptable square.
1 function checkBoard(row, col, piece){
2 var legal = false, opponent;
3
4 if (piece==PLAYER){
5 opponent = COMPUTER;
248