Question

以下是我的观点：

from graphics import *
from random import *
from math import *

class Ball(Circle):
    def init(self, win_width, win_high, point, r, vel1, vel2):
        Circle.init(self, point, r)

    self.width = win_width
    self.high = win_high

    self.vecti1 = vel1
    self.vecti2 = vel2


def collide_wall(self):
    bound1 = self.getP1()
    bound2 = self.getP2()

    if (bound2.y >= self.width):            
        self.vecti2 = -self.vecti2
        self.move(0, -1)
    if (bound2.x >= self.high):
        self.vecti1 = -self.vecti1
        self.move(-1, 0)
    if (bound1.x <= 0):
        self.vecti1 = -self.vecti1
        self.move(1, 0)
    if (bound2.y <= 0):            
        self.vecti2 = -self.vecti2
        self.move(0, 1)

def ball_collision(self, cir2):
    radius = self.getRadius()
    radius2 = cir2.getRadius()

    bound1 = self.getP1()      
    bound3 = cir2.getP1()


    center1 = Point(radius + bound1.x,radius + bound1.y)
    center2 = Point(radius2 + bound3.x,radius2 + bound3.y)

    centerx = center2.getX() - center1.getX()
    centery = center2.getY() - center1.getY()

    distance = sqrt((centerx * centerx) + (centery * centery))

    if (distance <= (radius + radius2)):
        xdistance = abs(center1.getX() - center2.getX())
        ydistance = abs(center1.getY() - center2.getY())

        if (xdistance <= ydistance):
            if ((self.vecti2 > 0 & bound1.y < bound3.y) | (self.vecti2 < 0 & bound1.y > bound3.y)):
                self.vecti2 = -self.vecti2


            if ((cir2.vecti2 > 0 & bound3.y < bound1.y) | (cir2.vecti2 < 0 & bound3.y > bound1.y)):
                cir2.vecti2 = -cir2.vecti2



        elif (xdistance > ydistance):
            if ((self.vecti1 > 0 & bound1.x < bound3.x) | (self.vecti1 < 0 & bound1.x > bound3.x)):
                self.vecti1 = -self.vecti1

            if ((cir2.vecti1 > 0 & bound3.x < bound1.x) | (cir2.vecti1 < 0 & bound3.x > bound1.x)):
                cir2.vecti1 = -cir2.vecti1


def main():
    win = GraphWin("Ball screensaver", 700,700)

velo1 = 4
velo2 = 3
velo3 = -4
velo4 = -3

cir1 = Ball(win.getWidth(),win.getHeight(),Point(50,50), 20, velo1, velo2)

cir1.setOutline("red")
cir1.setFill("red")
cir1.draw(win)

cir2 = Ball(win.getWidth(),win.getHeight(),Point(200,200), 20, velo3, velo4)
cir2.setOutline("blue")
cir2.setFill("blue")
cir2.draw(win)


while(True):
    cir1.move(cir1.vecti1, cir1.vecti2)
    cir2.move(cir2.vecti1, cir2.vecti2)
    time.sleep(.010)
    cir1.collide_wall()
    cir2.collide_wall()

    cir1.ball_collision(cir2)
    #cir2.ball_collision(cir1)


main()

好的，这就是问题所在。这个数学根本无法正常工作。有时它很有效，有时候一个球会超过另一个球，或者他们没有像球碰撞那样反应。我正在绞尽脑汁试图弄清问题是什么，但我觉得我现在太接近项目了。任何帮助将不胜感激。

Answer 1

修复“if”语句是合法且直截了当的。我想你可能会试着说出类似下面的内容。很难说，因为你没有记录你的代码。

if cir2.vecti2 > 0 and bound3.y > bound1.y:
    cir2.vecti2 = -cir2.vecti2

请注意，bound3没有值。你会发现其他问题，我敢肯定。

我建议您备份并尝试增量编码。首先，尝试让一个球合法移动，从墙上弹起。放入跟踪位置的打印报表，并标记它们，以便知道您在代码中的位置。

一旦你有了工作，然后添加第二个球。继续打印报表，评论出您认为不再需要的报表。在整个程序运行之前，请不要删除它们。

这会让你前进吗？

Python 2d球碰撞

1 个答案: