Provides screen oriented methods like bgcolor etc. Only relies upon the methods of TurtleScreenBase and NOT upon components of the underlying graphics toolkit - which is Tkinter in this case.
| 954 | |
| 955 | |
| 956 | class TurtleScreen(TurtleScreenBase): |
| 957 | """Provides screen oriented methods like bgcolor etc. |
| 958 | |
| 959 | Only relies upon the methods of TurtleScreenBase and NOT |
| 960 | upon components of the underlying graphics toolkit - |
| 961 | which is Tkinter in this case. |
| 962 | """ |
| 963 | _RUNNING = True |
| 964 | |
| 965 | def __init__(self, cv, mode=_CFG["mode"], |
| 966 | colormode=_CFG["colormode"], delay=_CFG["delay"]): |
| 967 | TurtleScreenBase.__init__(self, cv) |
| 968 | |
| 969 | self._shapes = { |
| 970 | "arrow" : Shape("polygon", ((-10,0), (10,0), (0,10))), |
| 971 | "turtle" : Shape("polygon", ((0,16), (-2,14), (-1,10), (-4,7), |
| 972 | (-7,9), (-9,8), (-6,5), (-7,1), (-5,-3), (-8,-6), |
| 973 | (-6,-8), (-4,-5), (0,-7), (4,-5), (6,-8), (8,-6), |
| 974 | (5,-3), (7,1), (6,5), (9,8), (7,9), (4,7), (1,10), |
| 975 | (2,14))), |
| 976 | "circle" : Shape("polygon", ((10,0), (9.51,3.09), (8.09,5.88), |
| 977 | (5.88,8.09), (3.09,9.51), (0,10), (-3.09,9.51), |
| 978 | (-5.88,8.09), (-8.09,5.88), (-9.51,3.09), (-10,0), |
| 979 | (-9.51,-3.09), (-8.09,-5.88), (-5.88,-8.09), |
| 980 | (-3.09,-9.51), (-0.00,-10.00), (3.09,-9.51), |
| 981 | (5.88,-8.09), (8.09,-5.88), (9.51,-3.09))), |
| 982 | "square" : Shape("polygon", ((10,-10), (10,10), (-10,10), |
| 983 | (-10,-10))), |
| 984 | "triangle" : Shape("polygon", ((10,-5.77), (0,11.55), |
| 985 | (-10,-5.77))), |
| 986 | "classic": Shape("polygon", ((0,0),(-5,-9),(0,-7),(5,-9))), |
| 987 | "blank" : Shape("image", self._blankimage()) |
| 988 | } |
| 989 | |
| 990 | self._bgpics = {"nopic" : ""} |
| 991 | |
| 992 | self._mode = mode |
| 993 | self._delayvalue = delay |
| 994 | self._colormode = _CFG["colormode"] |
| 995 | self._keys = [] |
| 996 | self.clear() |
| 997 | if sys.platform == 'darwin': |
| 998 | # Force Turtle window to the front on OS X. This is needed because |
| 999 | # the Turtle window will show behind the Terminal window when you |
| 1000 | # start the demo from the command line. |
| 1001 | rootwindow = cv.winfo_toplevel() |
| 1002 | rootwindow.call('wm', 'attributes', '.', '-topmost', '1') |
| 1003 | rootwindow.call('wm', 'attributes', '.', '-topmost', '0') |
| 1004 | |
| 1005 | def clear(self): |
| 1006 | """Delete all drawings and all turtles from the TurtleScreen. |
| 1007 | |
| 1008 | No argument. |
| 1009 | |
| 1010 | Reset empty TurtleScreen to its initial state: white background, |
| 1011 | no backgroundimage, no eventbindings and tracing on. |
| 1012 | |
| 1013 | Example (for a TurtleScreen instance named screen): |