我正试图在pygame中绘制一个振荡的矩形。
当我使用
时particle.pos[0] = 100 * math.sin(188.5 * t) + screen_width / 2
它按预期工作,但是当我使用
时omega = 2*math.pi*fps
particle.pos[0] = 100 * math.sin(omega * t) + screen_width / 2
绘制矩形,但不移动。我已经确认欧米茄的含量约为188.5,欧米茄和188.5都是浮子。我唯一能想到的是math.pi以某种方式导致问题,但我不知道为什么。
编辑: 整件事
import sys
import math
import pygame
from pygame.locals import *
pygame.init()
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)
fps = 30
fpsClock = pygame.time.Clock()
screen_width, screen_height = 640, 480
screen = pygame.display.set_mode((screen_width, screen_height))
class Particle:
"""Particle"""
def __init__(self, size, pos, particlecolor):
self.size = size
self.pos = pos
self.particlecolor = particlecolor
def draw(self):
pygame.draw.rect(screen, GREEN, [self.pos, self.size])
particle = Particle([10, 10], [screen_width * .25, screen_height * .5], GREEN)
t = 0
omega = 2*math.pi*fps
while True:
t += 1
screen.fill(BLACK)
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
sys.exit()
particle.pos[0] = 100 * math.sin(omega * t) + screen_width / 2
# particle.pos[0] = 100 * math.sin(188.5 * t) + screen_width / 2
particle.draw()
pygame.display.flip()
fpsClock.tick(fps)
答案 0 :(得分:2)
问题是您使用2 * math.pi弧度的倍数作为您的角度(即360°(一个完整的圆)),因此您从表达式100 * math.sin(omega * t) + screen_width / 2
获得几乎相同的结果。
print 100 * math.sin(omega * t) + screen_width / 2
输出:
319.99999999999784
319.9999999999957
319.99999999998784
319.99999999999136
319.9999999999949
319.99999999997567
319.99999999997925
尝试omega = 0.1
弧度以获得不错的结果。