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Line 1: − Turtle in a Pond is a strategy game. The goal is to surround the turtle before it runs off the screen.+ − [[File:Turtle-in-a-pond.png|300px]]+ − − === How to play Turtle in a Pond === − − Click on the dots to keep the turtle from escaping. − − <gallery> − File:Turtle-in-a-pond-win.png|The turtle is captured − File:Turtle-in-a-pond-lose.png|The turtle escaped − </gallery> − − − Did you know that: − * You can load your own [[#Strategy|strategy]] for the turtle by importing Python code you can write with [http://activities.sugarlabs.org/en-US/sugar/addon/4041 Pippy]? − − − ==== The Toolbars ==== − − [[Image:TurtlePond_toolbar-1.png]] − − :from left to right − # the Activity toolbar button (shown in the open position) − # the New-game button − # an area for messages − # the Load-new-strategy button − # the Reload-the-default-strategy button − # the Activity stop button − − === Strategy === − − Cut and paste these examples into Pippy and save then to your Sugar Journal. Then use the Load-new-strategy button in the Turtle-in-a-Pond Activity to try them. − − In this strategy, the turtle moves down regardless of whether the dot is open. − <pre> − def _turtle_strategy(self, turtle): − turtle[1] += 1 − return turtle − </pre> − − In this strategy, the turtle moves down until it is blocked (i.e., when the dot type is True). − <pre> − def _turtle_strategy(self, turtle): − if not self._dots[self._grid_to_dot((turtle[0], turtle[1]+1))].type: − turtle[1] += 1 − return turtle − </pre> − − In this strategy, the turtle searches for an open dot, looking clockwise. − − <pre> − def _turtle_strategy(self, turtle): − dots = self._surrounding_dots(turtle) − for i in range(6): # search for an opening − if not self._dots[dots[i]].type: − return self._dot_to_grid(dots[i]) − return turtle − </pre> − − In this version, the turtle orientation is set as well. − − <pre> − def _turtle_strategy(self, turtle): − dots = self._surrounding_dots(turtle) − for i in range(6): # search for an opening − if not self._dots[dots[i]].type: − self._orientation = i − return self._dot_to_grid(dots[i]) − return turtle − </pre> − − The turtle choose a random direction and goes there if the dot is open. − − <pre> − def _turtle_strategy(self, turtle): − dots = self._surrounding_dots(turtle) − n = int(uniform(0, 6)) # choose a random orientation − for i in range(6): # search for an opening − if not self._dots[dots[(i + n) % 6]].type: − self._orientation = (i + n) % 6 − return self._dot_to_grid(dots[(i + n) % 6]) − return turtle − </pre> − − In this strategy, the turtle will go off the edge if it can. − − <pre> − def _turtle_strategy(self, turtle): − dots = self._surrounding_dots(turtle) − for i in range(6): # search for an edge − if self._dots[dots[i]].type is None: − self._orientation = i − return self._dot_to_grid(dots[i]) − − n = int(uniform(0, 6)) # choose a random orientation − for i in range(6): # search for an opening − if not self._dots[dots[(i + n) % 6]].type: − self._orientation = (i + n) % 6 − return self._dot_to_grid(dots[(i + n) % 6]) − return turtle − </pre> − − In this version, it looks for a path to the edge in the direction it was already heading. − − <pre> − def _turtle_strategy(self, turtle): − dots = self._surrounding_dots(turtle) − − for i in range(6): # search for an edge − if self._dots[dots[i]].type is None: − self._orientation = i − return self._dot_to_grid(dots[i]) − − if self._daylight_ahead(turtle): − return self._dot_to_grid(dots[self._orientation]) − − n = int(uniform(0, 6)) # choose a random orientation − for i in range(6): # search for an opening − if not self._dots[dots[(i + n) % 6]].type: − self._orientation = (i + n) % 6 − return self._dot_to_grid(dots[(i + n) % 6]) − return turtle − </pre> − − In the '''default strategy''', a weighing function is used: preference is given to dots closer to the edges. − <pre> − def _turtle_strategy(self, turtle): − dots = self._surrounding_dots(turtle) − dots_ordered_by_weight = self._ordered_weights(turtle) − for i in range(6): − self._orientation = dots.index(dots_ordered_by_weight[i]) − if self._daylight_ahead(turtle): − return self._dot_to_grid(dots[self._orientation]) − − n = int(uniform(0, 6)) − for i in range(6): − if not self._dots[dots[(i + n) % 6]].type: − self._orientation = (i + n) % 6 − return self._dot_to_grid(dots[(i + n) % 6]) − self._orientation = (i + n) % 6 − return turtle − </pre> − − The dots are stored in a 13✕13 array. Each dot has an attribute, 'type', that determines it status. The edges have a type=None. Occupied dots have a type=True. Unoccupied dots have a type=False. − − Your strategy should start with: − − def _turtle_strategy(self, turtle): − − The turtle argument is a tuple containing the column and row of the current turtle position. That is, turtle[0] is the horizontal position and turtle[1] is the vertical position. − − Your strategy should return a tuple containing the column and row of the new turtle position, e.g., − − return [column, row] − − There are some resources that you can use in your program, including: − − ;self._surrounding_dots((column, row)): returns an array of dots surrounding a given position in the grid − ;self._daylight_ahead((column, row)): returns True if there is a clear path to the edge heading in the current direction − ;self._ordered_weights((column, row)): returns an array of surrounding dots ordered by their distance from the edge − ;self._dots: the array of dots from which you can test the type attribute (self._dots[i].type==None → edge; self._dots[i].type==False → open; self._dots[i].type==True → blocked) − ;self._orientation:you can set the orientation of your turtle by assigning a number from 0-5 (clockwise beginning with 30 degrees from north) − ;self._set_label('your message here'):you can write a message on the toolbar if you want to communicate what your turtle is thinking − ;self._grid_to_dot((column, row)): returns the dot that is at a grid position (column, row) − ;self._dot_to_grid(dot): returns an array (column, row) representing the grid position of a dot − − === Where to get Turtle in a Pond === − − The Turtle in a Pond activity is available for download from the [http://activities.sugarlabs.org Sugar activity portal]: [http://activities.sugarlabs.org/en-US/sugar/addon/4516 Turtle in a Pond] − − The source code is available on [http://git.sugarlabs.org/turtlepond the Sugar Labs Gitorious server]. − − [[Category:Activity]]
remove 'deprecated' word
==Turtle in a Pond Activity==
==Turtle in a Pond Activity==
Read at https://help.sugarlabs.org/turtle_in_a_pond.html
The source file has been moved to [https://github.com/godiard/help-activity/blob/master/source/turtle_in_a_pond.rst GitHub]