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# -*- coding: utf-8 -*-
"""
"""
__author__ = 'Robert Ancell <bob27@users.sourceforge.net>'
__license__ = 'GNU General Public License Version 2'
__copyright__ = 'Copyright 2005-2006 Robert Ancell'
import glchess.scene
class SceneHumanInput:
"""
"""
def __init__(self):
"""Constructor for a scene with human selectable components"""
self.__inputEnabled = True # Flag to control if human input is enabled
self.__startSquare = None # The selected square to move from
self.__showHints = True
# Methods to extend
def onRedraw(self):
"""This method is called when the scene needs redrawing"""
pass
def playerIsHuman(self):
"""Check if the current player is a human.
Return True the current player is human else False.
"""
return False
def getSquare(self, x, y):
"""Find the chess square at a given 2D location.
'x' is the number of pixels from the left of the scene to select.
'y' is the number of pixels from the bottom of the scene to select.
Return the co-ordinate as a tuple in the form (file,rank) or None if
no square at this point.
"""
pass
def squareIsFriendly(self, coord):
"""Check if a given square contains a friendly piece.
Return True if this square contains a friendly piece.
"""
return False
def canMove(self, start, end):
"""Check if a move is valid.
'start' is the location to move from in LAN format (string).
'end' is the location to move from in LAN format (string).
"""
return False
def moveHuman(self, start, end):
"""Called when a human player moves.
'start' is the location to move from in LAN format (string).
'end' is the location to move from in LAN format (string).
"""
pass
# Public methods
def enableHumanInput(self, inputEnabled):
"""Enable/disable human input.
'inputEnabled' is a flag to show if human input is enabled (True) or disabled (False).
"""
if inputEnabled is False:
self.__selectSquare(None)
self.__inputEnabled = inputEnabled
def select(self, x, y):
"""
"""
if self.__inputEnabled is False:
return
# Only bother if the current player is human
if self.playerIsHuman() is False:
return
# Get the selected square
coord = self.getSquare(x, y)
if coord is None:
return
# Deselect when clicking on piece a second time
if self.__startSquare == coord:
self.__selectSquare(None)
return
# If this is a friendly piece then select it
if self.squareIsFriendly(coord):
self.__selectSquare(coord)
else:
# If we have already selected a start move try
# and move to this square
if self.__startSquare is not None:
self.__move(self.__startSquare, coord)
# Redraw the scene
self.onRedraw()
return coord
def deselect(self, x, y):
"""
"""
if self.__inputEnabled is False:
return
# Only bother if the current player is human
if self.playerIsHuman() is False:
return
# Get the selected square
coord = self.getSquare(x, y)
if coord is None:
return
# Attempt to move here
if self.__startSquare is not None and self.__startSquare != coord:
self.__move(self.__startSquare, coord)
# Redraw the scene
self.onRedraw()
return coord
# Private methods
def __selectSquare(self, coord):
if self.__startSquare == coord:
return
self.__startSquare = coord
self.selectSquare(coord)
def __move(self, start, end):
"""Attempt to make a move.
...
"""
if self.canMove(start, end) is False:
return
self.__selectSquare(None)
self.moveHuman(start, end)
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