user6442076 - 8 months ago 54

Python Question

I'm making a game like 'angry bird'.

There are two input:power and angle.

I apply those inputs to parabolic curve.

My turtle flies, making a parabolic curve. and my turtle have to hit the target,

but my turtle draws strange curve when angle is greater than 46, angle is 30, 40 etc...

I don't know where is problem....here is my code:

`import turtle`

import random

import math

g=9.80665

origin_x=-480

origin_y=-180

flag=False

def create_target():

x=random.randint(0,500)

y=random.randint(-200,0)

target=turtle.Turtle()

target.hideturtle()

target.penup()

target.goto(x,y)

target.shape('square')

target.color('red')

target.showturtle()

return target

def create_turtle():

homework=turtle.Turtle()

homework.hideturtle()

homework.penup()

homework.speed(0)

homework.goto(origin_x,origin_y)

homework.pendown()

homework.shape('turtle')

homework.color('blue')

homework.left(45)

homework.showturtle()

return homework

def setting():

'''drawing back ground lines'''

setting=turtle.Turtle()

setting.hideturtle()

setting.speed(0)

turtle.colormode(255)

setting.pencolor(214,214,214)

for y in range(100,-101,-100):

setting.penup()

setting.goto(-500,y)

setting.pendown()

setting.goto(500,y)

for x in range(-375,500,125):

setting.penup()

setting.goto(x,200)

setting.pendown()

setting.goto(x,-200)

def throw_turtle(turtle,target):

angle=int(input("Enter Angle:"))

power=int(input("Enter Power:"))

'''

parabola fomula:

x coordinate: speed(in here, that is power) * cos(anlge)*time

y coordinate: speed*sin(angle)*time - (gravity speed*time**2)/2

'''

for time in range(1,20):

# the origin fomula is for the situation that starts from (0,0). so I think

# I should compensate it, but is it right?

x=power*math.cos(angle)*time + origin_x

y=power*math.sin(angle)*time - (((time**2)*g)/2) + origin_y

if x<origin_x: # I think it has problem...

x-=origin_x

turtle.goto(x,y)

turtle.stamp() #this is for testing

if (x==target.xcor()) and (y==target.ycor()):

print("******Target is HIT!!! ******")

print("End of Game")

flag=True

break

else:

print("You missed...")

turtle.setup(1000,400)

windo=turtle.Screen()

windo.title('Angry Turtle')

setting()

#__main

my_turtle=create_turtle()

while flag==False:

target=create_target()

my_turtle=create_turtle()

my_turtle.speed(6)

throw_turtle(my_turtle,target)

my_turtle.hideturtle()

target.hideturtle()

I think

`create_target()`

`create_turtle()`

`setting()`

Answer

Below, I reduce your code to a MVCE (minimal, complete, and verifiable example) to examine the parabolic curve drawing code. The problem I found with it is the usual one of the difference between ** degrees** and

`turtle.radians()`

. Either way is fine but the usage has to be consistent:```
from turtle import Turtle, Screen
import math
import random
G = 9.80665
origin_x = -480
origin_y = -180
def create_turtle():
homework = Turtle(shape='turtle')
homework.hideturtle()
homework.penup()
homework.goto(origin_x, origin_y)
homework.pendown()
homework.speed(0)
homework.left(45)
homework.showturtle()
return homework
def throw_turtle(turtle):
angle = int(input("Enter Angle (in degrees): "))
power = int(input("Enter Power: "))
# parabola formula:
# x coordinate: speed(in here, that is power) * cos(angle)*time
# y coordinate: speed*sin(angle)*time - (gravity speed * time**2)/2
for time in range(1, 20):
x = power * math.cos(math.radians(angle)) * time + origin_x
y = power * math.sin(math.radians(angle)) * time - (((time ** 2) * G) / 2) + origin_y
turtle.goto(x, y)
turtle.stamp() # this is for testing
window = Screen()
window.setup(1000, 400)
for _ in range(3):
my_turtle = create_turtle()
my_turtle.color(random.choice(['red', 'green', 'blue', 'purple', 'black']))
throw_turtle(my_turtle)
window.exitonclick()
```

**EXAMPLE**

```
> python3 test.py
Enter Angle (in degrees): 30
Enter Power: 120
Enter Angle (in degrees): 45
Enter Power: 90
Enter Angle (in degrees): 60
Enter Power: 90
>
```

Now, what more do you want it to do parabolic curve-wise?

Source (Stackoverflow)