1.19 Queens: "show-queen.rkt"
| (require htdp/show-queen) | package: htdp-lib |
The teachpack provides the function show-queen , which implements a GUI for exploring the n-queens problem.
procedure
(show-queen board) → true
board : (list-of (list-of boolean?))
The
function show-queen consumes a list of
lists of booleans that describes a board. Each of the inner
lists must have the same length as the outer list. The
trues correspond to positions where queens are,
and the falses correspond to empty squares. The
function returns nothing.
In the GUI window that show-queen opens, the red and orange dots show where the queens are. The green dot shows where the mouse cursor is. Each queen that threatens the green spot is shown in red, and the queens that do not threaten the green spot are shown in orange.