Question

问题是什么

我必须在1比1的盒子里模拟球。我必须给球一个随机的速度和一个随机的角度。然而，当我绘制球时，它们会直线并且在0.25时具有渐近线。我翻了几倍我的数学但我找不到问题？

我的代码

   import numpy
   import matplotlib.pyplot as plt
   import math
   import random



def rand_tuples(aantalballen):  # here i make a function that randomly makes a list with lists in #

    list_balls = []             # the list, every index is a ball with x_pos , y_pos , speed , rotation #

    for i in range(aantalballen):

        list_balls.append([0.25, 0.75,0.1* random.random(), 2* math.pi*random.random()])


    return list_balls 


def ball_step(list_balls, dt): # this function calculates the steps the balls takes #


    x = list_balls[0]   
    y = list_balls[1]
    vx = math.cos(list_balls[3]) * list_balls[2]    # speed in the x direction #
    vy = math.sin(list_balls[3]) * list_balls[2]    # speed in the y direction #
    dt = dt

    x_pos = x + (vx * dt)            # calculates the actual positions #
    y_pos = y + (vy * dt)

    if x_pos <= 0 or x_pos >= 1:     # collision detection #
        vx = -vx


    if y_pos <= 0 or y_pos >= 1:
        vy = -vy



    return x_pos, y_pos, vx , vy     # returns the new positions but the same speed so that they can be used again#


def move_ball(ballen, tijd, dt):  # takes a list of balls, time they move and the time steps they take# 

    positions_balls = { }     # hold my position in  {0:{'x':[positions}, 'y':{...}}}

    time_1 = 0

    for i in range(len(ballen)) :  

        positions_balls[i] = None    # make a key with empty value #
        time_1 = 0

        cordinates = {'x':[], 'y':[]}       # make the dictionary where my values go into #

        while time_1 < tijd:    

            bal = ball_step(ballen[i] , dt)    # call bal step to calculate my x and y position #
            ballen[i] = bal
            cordinates['x'].append(bal[0])      
            cordinates['y'].append(bal[1])
            time_1 += dt



            if int(time_1) == tijd:
                positions_balls[i] = cordinates # finally add the dictionary to my main dictionary #

    print positions_balls
    return positions_balls






dic = move_ball(rand_tuples(30), 3, 0.01)

plt.plot(dic[0]['x'], dic[0]['y'])
plt.show()

我没有足够的声誉来发布情节图片:(

Answer 1

ball_step（）接受（我认为;评论是你的朋友）x，y，速度，旋转。它输出x，y，速度x，速度y。这已被分配回原始列表。

碰撞检测盒中的多个球

1 个答案: