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# -*- coding: utf-8 -*-
"""
HitTheBalls : hit the ball(s) with the good result.
Copyright (C) 2013 Laurent Bernabe <laurent.bernabe@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
from math import sqrt
class Ball(object):
"""
An abstractation of a ball. Its size is automatically adjusted with
its given operation text.
"""
def __init__(self, txt_font, txt_color, bg_color, operation,
move_area, velocity=(0, 0)):
"""
Constructor
txt_font : text font => olpcgames.pangofont
txt_color : text color => Tuple of 3 integers in [0,255]
bg_color : background color => Tuple of 3 integers in [0,255]
operation : operation => An Operation value
move_area : space where ball is allowed to be => Tuple of 4 integers (
left side x, top side y, right side x, bottom side y)
velocity : current direction of move (so a (0,0) velocity for a fixed
ball) => A tuple of 2 floats (x,y)
"""
self._txt_font = txt_font
self._txt_color = txt_color
self._bg_color = bg_color
self._operation = operation
self._center = (0, 0)
self._velocity = velocity
self._move_area = move_area
self._visible = True
txt_size = txt_font.size(operation.get_text())
if txt_size[0] > txt_size[1]:
max_txt_size = txt_size[0]
else:
max_txt_size = txt_size[1]
self._diameter = int(max_txt_size * 1.25)
def get_txt_font(self):
"""
Accessor to the text font
=> olpcgames.pangofont
"""
return self._txt_font
def get_diameter(self):
"""
Accessor to the diameter.
=> Int value
"""
return self._diameter
def get_bg_color(self):
"""
Accessor to the background color.
=> Tuple of 3 integers
"""
return self._bg_color
def get_txt_color(self):
"""
Accessor to the text (foreground) color.
=> Tuple of 3 integers
"""
return self._txt_color
def get_operation(self):
"""
Accessor to the operation.
=> Operation instance.
"""
return self._operation
def get_center(self):
"""
Accessor to the center position.
=> Tuple of 2 integers.
"""
return tuple([int(x) for x in self._center])
def move_to(self, new_center_position):
"""
Moves the ball to a particular place.
new_center_position : the new center position => a tuple of 2 integers
"""
if (new_center_position[0] - self._diameter < self._move_area[0]
or new_center_position[0] + self._diameter > self._move_area[2]
or new_center_position[1] - self._diameter < self._move_area[1]
or new_center_position[1] + self._diameter > self._move_area[3]):
self._center = (self._move_area[0] + self._diameter,
self._move_area[1] + self._diameter)
else:
self._center = new_center_position
def move(self):
"""
Moves the ball by its current velocity.
Please notice that this velocity will change whenever the ball hits
a wall (a screen side).
"""
expected_new_center = (self._center[0] + self._velocity[0],
self._center[1] + self._velocity[1])
self._center = expected_new_center
radius = self._diameter / 2
# Ball must not go across left or right wall.
if (self._center[0] < self._move_area[0] + radius
or self._center[0] > self._move_area[2] - radius):
self._velocity = (-self._velocity[0], self._velocity[1])
self._center = (self._center[0] + self._velocity[0],
self._center[1] + self._velocity[1])
# Ball must not go across top or bottom wall.
elif (self._center[1] < self._move_area[1] + radius
or self._center[1] > self._move_area[3] - radius):
self._velocity = (self._velocity[0], -self._velocity[1])
self._center = (self._center[0] + self._velocity[0],
self._center[1] + self._velocity[1])
def oppose_velocity_and_move(self):
"""
Alters the velocity, by multiplying each of its values
by -1, then move it from one step (calling move).
"""
self._velocity = (self._velocity[0] * -1,
self._velocity[1] * -1)
def contains(self, point):
"""
Tells whether the given point is inside the ball.
point : the point to test => tuple of 2 integers
=> Boolean
"""
vector_to_center = (point[0] - self._center[0],
point[1] - self._center[1])
dist_to_center = sqrt(vector_to_center[0] * vector_to_center[0]
+ vector_to_center[1] * vector_to_center[1])
return dist_to_center <= self._diameter / 2
def is_visible(self):
"""
Tells whether this ball is visible.
=> Boolean
"""
return self._visible
def show(self):
"""
Makes the ball visible.
"""
self._visible = True
def hide(self):
"""
Makes the ball hidden.
"""
self._visible = False
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