Question

Q: Python ball in billiards board (Bouncing ball) Ball class contains two essential components: position (ball.x. ball.v. ball.pos) and velocity wwww ww (ball.xvel ball.yvel, ball.vel). What you must design is two functions, one of which is update ball It is a function which accepts a ball as an argument, and outputs a new ball representing the state of the ball in the instant after it next bounces off of a wall As an illustration of the expected behaviour, and how to access the properties of a Ball object, see the code below (you can find the code in the file examples/balltest.py ball Ball (1,2,0) # Create a Ball object with initial position x1, y -2 and #an initial direction of zero radians anticlockwise from point right # Will output 1 print (bal) print (ball print (ball ve travelling directly right print (balw.e) travelling directly right #Will output 2 # Will output 1 because ball is # Will output 0 because ball is ball update ball (ball boxWidth, boxHeight) YOU MUST FROGRAM THIS FUNCTION print (ball) #Will be the x position of the right wall, vhere the ball bounced print (bal print a ve) print (ballwe) print (balld) heading left #Will be 2 #Will be-1 wwwwwwwvww #Will be 0 #Will be (-pi), since ball is nov plot bounces function takes inputs as follows: plot bounces (init ball, towwwwroe wwwww.wnwww.waannnn (boxWidth, boxHeight)] numbounces, boww wn0wwww. My code for update already checks for screen edge and flips the direction of the ball. However I would like a version that calls the right classes and makes my ball bounce.

Answer 1

import math

class Ball: # class ball
x = 0#data members
y = 0#data members
pos = 0#data members
xvel = 0#data members
yvel = 0#data members
vel = 0#data members
d = 0#data members

def __init__(self, x, y, d):#constructor
self.x = x
self.y = y
self.pos = math.sqrt(self.x**2+self.y**2)#pythagoras
self.d = d
self.xvel = math.cos(self.d)
self.yvel = math.sin(self.d)
self.vel = math.sqrt(self.x**2+self.y**2) # pythagoras

def update_ball(ball, boxWidth, boxHeight):#update_ball function
temp = ball
xvel = 1
yvel = temp.yvel/temp.xvel
while temp.x != boxWidth and temp.y != boxHeight:
temp.x += xvel
temp.y += yvel
temp.d -= math.pi
temp.d %= 2*math.pi
temp.xvel = math.cos(ball.d)
temp.yvel = math.sin(ball.d)
ball.pos = math.sqrt(ball.x**2+ball.y**2)
vel = math.sqrt(ball.x**2+ball.y**2)
return temp

def plot_bounces(init_ball, numbounces, boxWidth, boxHeight):#plot_bounces function
temp = init_ball
for i in range(numbounces):
temp = update_ball(temp, boxWidth, boxHeight)

ball = Ball(1, 2, 0)
print(int(ball.x))
print(int(ball.y))
print(int(ball.xvel))
print(int(ball.yvel))
ball = update_ball(ball, 2, 4)
print(int(ball.x))
print(int(ball.y))
print(int(ball.xvel))
print(int(ball.yvel))
print(ball.d)

: Ball init 1.py import math 1 2 3 4 class Ball1: # class ball X = 0#data members 5 y = 0#data members 6 pos 0#data members xvel 0#data members yvel 0# data members vel = 0 #data members d 0#data members 7 10 11 12 def_init (self, x, y, d):#constructor 13 self.x x |14 self.y y self.pos math.sqrt(self.x 2 self.y 2) pythagoras 15 16 self.d d 17 self.xvel math.cos(self.d) self.yvel math.sin(self.d) self.vel math.sqrt(self.x2+self.y*2) #pythagoras 18 19 20 21 22 defupdate_ball(ball, boxWidth, boxHeight):#update_ball function 23 24 temp = ball xvel 1 25 yvel temp.yvel temp.xvel 26

1.py Ball init 27 while temp.x != boxWidth and temp.y- boxHeight: 28 temp.x += xvel temp.y += yvel temp.d math.pi temp.d%- 2*math.pi 29 30 31 temp.xvel math.cos(ball.d) temp.yvel math.sin(ball.d) ball.pos math.sqrt(ball.x 2+bally* 2) 32 33 34 vel math.sqrt(ball.x 2+ball.y 2) return temp 35 36 37 38 def plot_bounces(init_ball, numbounces, boxWidth, boxHeight):#plot_bounces function 39 40 init ball temp for i in range(numbounces): 41 update_ball(temp, boxWidth, boxHeight) 42 temp 43 44 ball = Ball(1, 2, 0) 45 46 print(int(ball.x)) print(int(ball.y) print(int(ball.xvel)) print(int(ball.yvel) ball update_ball(ball, 2, 4) print(int(ball.x)) 47 48 49 50 51 print(int(ball.y)) 52

Ball(1, 2, 0) ball 45 46 print(int(ball.x)) print(int(ball.y)) 47 print(int(ball.xvel)) print(int(ball.yvel) |ball- update_ball(ball, 2, 4) print(int(ball.x)) 52 print(int(ball.y)) 53 print(int(ball.xvel)) 54 print(int(ball.yvel)) print(ball.d) 48 49 50 51 55 56

OUTPUT

PS E:\fixer> python .\1.py 1 2 1 0 $2 -1 0 3.141592653589793 HNHONN I

COMMENT DOWN FOR ANY QUERY

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