Flash MX 2004 Games : Art to ActionScript

Chapter 15: Mazes
Notice that the frame 1 code contains a call to a function called ‘createMaze’. The purpose of this
function is to dynamically create the duplicated movie clips that show a maze grid. To ensure that
a previous maze grid is deleted the function calls ‘clearCells’. The number of duplicated movie
clips in the vertical direction is stored in the variable ‘cellV’ and the number in the horizontal
direction in the variable ‘cellH’. These two variables are used by the ‘clearCells’ function in the
two loops, for ‘row’ and ‘col’. Having duplicated a clip it is positioned based on a grid centred on
the middle of the movie. To centre something you can use the code snippet
left = (movieWidth - clipWidth)/2;
top = (movieHeight - clipHeight)/2;
The ‘orgX’ and ‘orgY’ variables, Listing 15.2, lines 6 and 7, are set in a similar way, only rather
than using the value for a clip’s width and height we take the value of the number of rows and
columns multiplied by a cell width and height, giving the total width of the maze on screen.
1 function createMaze(){
2 var name, row, col, count = 1, orgX, orgY;
3
4 if (cellH>0 || cellV>0) clearCells();
5
6 orgX = (450 - cols * 16)/2;
7 orgY = (400 - rows * 16)/2;
8
9 for (row=0; row