Activities/Turtle in a Pond
Turtle in a Pond Activity
Turtle in a Pond is a strategy game. The goal is to surround the turtle before it runs of the screen.
How to play Turtle in a Pond
Did you know that:
- You can load your own strategy for the turtle
The Toolbars
- from left to right
- the Activity toolbar button
- the New Game button
- the Load new strategy button
- the Reload the default strategy button
- the Stop button
Strategy
The default strategy is simple: choose a random direction and go there if the dot is open.
def _turtle_strategy(self, turtle): c = turtle[1] % 2 n = int(uniform(0, 6)) for i in range(6): col = turtle[0] + CIRCLE[c][(i + n) % 6][0] row = turtle[1] + CIRCLE[c][(i + n) % 6][1] if not self._dots[self._grid_to_dot((col, row))].type: return [col, row] return turtle
In this version, the turtle moves down, regardless of whether the dot is open.
def _turtle_strategy(self, turtle): turtle[1] +=1 return turtle
In this version, the turtle will go off the edge if it can.
def _turtle_strategy(self, turtle): c = turtle[1] % 2 for i in range(6): col = turtle[0] + CIRCLE[c][i][0] row = turtle[1] + CIRCLE[c][i][1] if self._dots[self._grid_to_dot((col, row))].type is None: return [col, row] n = int(uniform(0, 6)) for i in range(6): col = turtle[0] + CIRCLE[c][(i + n) % 6][0] row = turtle[1] + CIRCLE[c][(i + n) % 6][1] if not self._dots[self._grid_to_dot((col, row))].type: return [col, row] return turtle
The dots are stored in a 13x13 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 [col, row]
There are some resources that you can use in your program, including:
- CIRCLE
- a 2x6x2 array of offsets that can used to find the col and row of the dots surrounding the turtle.
- self._dots
- the array of dots.
- self._pressed
- the index of the most recent dot pressed by the user
Where to get Turtle in a Pond
The Turtle in a Pond activity is available for download from the Sugar activity portal: Turtle in a Pond
The source code is available on the Sugar Labs Gitorious server.