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我目前正在尝试实现自己的 SAT(分离轴定理)碰撞检测系统,但遇到了问题。在第 34 行,我收到此错误消息:

第 34 行,在碰撞轴 = (v[1], -v[0]) TypeError: 'int' object is not subscriptable

奇怪的是 v 不是一个 int,它是一个元组。

这是代码

import math
import pygame

WIDTH = 900
HEIGHT = 700

pygame.init()

screen = pygame.display.set_mode((WIDTH, HEIGHT))

clock = pygame.time.Clock()

def dot(v1, v2):
    return v1[0]*v2[0] + v1[1]*v2[1]

polygons = []

class Polygon():
    def __init__(self, points):
        self.points = points
        self.vectors = []
        for p1 in range(len(self.points)):
            p2 = p1 + 1
            if p2 > len(self.points) - 1:
                p2 = 0
            v = (self.points[p2][0] - self.points[p1][0], self.points[p2][1] - self.points[p1][1])#int object not subscriptable
            self.vectors.append(v)
        polygons.append(self)
    def collision(self):
        for p in polygons:
            collision = True
            if p.points != self.points:
                for v in range(len(p.vectors)):
                    axis = (v[1], -v[0])
                    selfFirst = True
                    pFirst = True
                    for point in self.points:
                        if selfFirst == True:
                            selfFirst = False
                            projection = dot(point, axis)
                            selfMin = projection
                            selfMax = projection
                        else:
                            projection = dot(point, axis)
                            if projection < selfMin:
                                selfMin = projection
                            elif projection > selfMax:
                                selfMax = projection
                    for point in p.points:
                        if pFirst == True:
                            pFirst = False
                            projection = dot(point, axis)
                            pMin = projection
                            pMax = projection
                        else:
                            projection = dot(point, axis)
                            if projection < pMin:
                                pMin = projection
                            elif projection > pMax:
                                pMax = projection
                    if (selfMin > pMin and selfMin < pMax) or (selfMax > pMin and selfMax < pMax):
                        collision = True
                    else:
                        collision = False
                        return collision

polygon1 = Polygon([(0, 0), (100, 100), (0, 100)])
polygon2 = Polygon([(300, 300), (150, 0), (0, 150)])

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
    screen.fill((0,0,0))

for polygon in polygons:
    polygon.collision()
    pygame.draw.polygon(screen, (0, 255, 0), polygon.points, 1)

        pygame.display.flip()
        clock.tick(60)


    pygame.display.quit()

问题在第 34 行

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2 回答 2

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所以v你的循环内部是一个整数,访问整数的第一个/第二个位置是没有意义的(这就是你在做这v[1], -v[0]件事时所做的),因此你会得到关于可下标事物的错误。

在:

for v in range(len(p.vectors)):
        axis = (v[1], -v[0])

返回一个整数列表,range因为您将另一个整数作为参数传递给它 ( len(p.vectors))。真的不知道是什么p.vectors,我假设是一个v可能有位置0和位置的对象列表1,所以也许这会起作用:

for v in p.vectors:
        axis = (v[1], -v[0])
于 2016-11-04T16:41:48.953 回答
0

这是变量命名的对象课程。

v在第 27 行中,您分配__init__()给: v = (self.points[p2][0] - self.points[p1][0], self.points[p2][1] - self.points[p1][1])

然后在循环中重新分配它并破坏之前的分配: for v in range(len(p.vectors)):

len()返回一个整数并range()返回一个整数列表。因此,每个循环v都被分配了该范围内的一个整数。因此v现在是一个整数且不可下标。

也许是这样的: for v in p.vectors:对你来说会更好。

于 2016-11-04T16:45:12.007 回答