类的定义与使用
cball = Projectile(angle, vel, h0)中， cball传入给self
一个炮弹从某个倾角射出计算水平位移和大致飞行时间的程序
# projectile.py
from math import radians, sin , cos
##############类的定义#######
class Projectile():
def __init__(self, angle, velocity, height):
self.xpos = 0.0
self.ypos = height
theta = radians(angle)
self.xvel = velocity * cos(theta)
self.yvel = velocity * sin(theta)
self.totaltime = 0.0
def update(self, time):
self.xpos = self.xpos + time * self.xvel
yvel1 = self.yvel - 9.8 * time
self.ypos = self.ypos + time * (self.yvel + yvel1) / 2.0
self.yvel = yvel1
self.totaltime = self.totaltime + time
def getX(self):
return self.xpos
def getY(self):
return self.ypos
#############################
###############函数定义########
def getIputs():
a = float(input("Enter the lanuch angle (in degrees):"))
v = float(input("Enter the lanuch velocity (in meters/sec):"))
h = float(input("Enter the lanuch height (in meters):"))
t = float(input("Enter the internal between position calculations:"))
return a, v, h, t
def main():
angle, vel, h0, time = getIputs()
cball = Projectile(angle, vel, h0)
while cball.getY() >= 0:
cball.update(time)
print("\nDistance traveled: {0:0.1f} meters.".format(cball.getX()))
print("\nTotal time spent is roughly: {0:0.1f} sceonds.".format(cball.totaltime))
#############################
###########函数调用###########
if __name__ == '__main__':
main()运行示例：
'''
Enter the lanuch angle (in degrees):50
Enter the lanuch velocity (in meters/sec):1
Enter the lanuch height (in meters):50
Enter the internal between position calculations:1
Distance traveled: 2.6 meters.
Total time spent is roughly: 4.0 sceonds.
'''
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