Pygame 水物理无法按预期工作 [英] Pygame water physics not working as intended
问题描述
所以，我一直在尝试根据本教程在 pygame 中实现水物理
So, I have been trying to implement water physics in pygame based on this tutorial
问题是，当我在 pygame 中实现这段代码时，水决定它不会产生很好的涟漪效果，而是会发疯并在整个屏幕上摆动，直到最终崩溃.
The issue is, when I implemented this code in pygame, the water decides that instead of having a nice ripple effect, its going to go crazy and wiggle all over the screen until it eventually crashes.
我环顾了一些不和谐的服务器，发现其他人曾试图实现同样的事情，但遇到了同样的问题.他们的代码基本上和我的一样，只是组织得更整齐，所以我会发布它而不是我的.
I looked around on some discord server and found someone else had tried to implement the same thing, and had got the same problem. Their code is basically the same as mine just more neatly organized so I will post it instead of mine.
import pygame, random
import math as m
from pygame import *
pygame.init()
WINDOW_SIZE = (854, 480)
screen = pygame.display.set_mode(WINDOW_SIZE,0,32) # initiate the window
clock = pygame.time.Clock()
font = pygame.font.SysFont("Arial", 18)
class surface_water_particle():
def __init__(self, x,y):
self.x_pos = x
self.y_pos = y
self.target_y = y
self.velocity = 0
self.k = 0.02
self.d = 0.02
self.time = 1
def update(self):
x = -(self.target_y - self.y_pos)
a = -(self.k * x - self.d * self.velocity)
self.y_pos += self.velocity
self.velocity += a
class water():
def __init__(self, x_start, x_end, y_start, y_end, segment_length):
self.springs = []
self.x_start = x_start
self.y_start = y_start
self.x_end = x_end
self.y_end = y_end - 10
for i in range(abs(x_end - x_start) // segment_length):
self.springs.append(surface_water_particle(i * segment_length + x_start, y_end))
def update(self, spread):
for i in range(len(self.springs)):
self.springs[i].update()
leftDeltas = [0] * len(self.springs)
rightDeltas = [0] * len(self.springs)
for i in range(0, len(self.springs) ):
if i > 0:
leftDeltas[i] = spread * (self.springs[i].y_pos - self.springs[i - 1].y_pos)
self.springs[i - 1].velocity += leftDeltas[i]
if i < len(self.springs) - 1:
rightDeltas[i] = spread * (self.springs[i].y_pos - self.springs[i + 1].y_pos)
self.springs[i + 1].velocity += rightDeltas[i]
for i in range(0, len(self.springs) ):
if i > 0:
self.springs[i - 1].velocity += leftDeltas[i]
if i < len(self.springs) - 1:
self.springs[i + 1].velocity += rightDeltas[i]
def splash(self, index, speed):
if index > 0 and index < len(self.springs) :
self.springs[index].velocity = speed
def draw(self):
water_surface = pygame.Surface((abs(self.x_start - self.x_end), abs(self.y_start - self.y_end))).convert_alpha()
water_surface.fill((0,0,0,0))
water_surface.set_colorkey((0,0,0,0))
polygon_points = []
polygon_points.append((self.x_start, self.y_start))
for spring in range(len(self.springs)):
polygon_points.append((water_test.springs[spring].x_pos, water_test.springs[spring].y_pos))
polygon_points.append((water_test.springs[len(self.springs) - 1].x_pos, self.y_start))
#pygame.draw.polygon(water_surface, (0,0,255), polygon_points)
for spring in range(0,len(self.springs) - 1):
pygame.draw.line(screen, (0,0,255), (water_test.springs[spring].x_pos, water_test.springs[spring].y_pos), (water_test.springs[spring + 1].x_pos, water_test.springs[spring + 1].y_pos), 2)
#water_surface.set_alpha(100)
return water_surface
def update_fps():
fps_text = font.render(str(int(clock.get_fps())), 1, pygame.Color("coral"))
screen.blit(fps_text, (0,0))
water_test = water(0,800,200,80, 20)
while True:
screen.fill((255,255,255))
water_test.update(0.5)
screen.blit(water_test.draw(), (0,0))
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
if event.type == MOUSEBUTTONDOWN:
water_test.splash(10,0.1)
pygame.display.update()
clock.tick(60)
我尝试查找我们实施本教程的任何问题，但找不到任何看起来不合适的地方.然后我尝试添加一个阻力函数，该函数可以在每次更新时划分水流速度.然而，这并没有解决问题.
I tried looking for any issues with our implementations of the tutorial but I could not find anything that seemed out of place. I then tried adding a resistance function that would divide the water velocity each time it updates. This however did not fix the issue.
有谁知道哪里做错了以及如何解决这个问题?
Does anyone know what was done wrong and how to fix this?
推荐答案
许多与其他帖子相同的观察结果.我评论了一些事情，稍微改变了你的速度声明.而在传播"中我添加了通行证.
Many of the same observations as the other post. I commented a few things up, changed your velocity statement a bit. And in the "spreading" I added the passes.
稍微修改了数字，并得到了一些非常好的飞溅.(比公认的解决方案更好！:(哈哈.
Tinkered with the numbers a bit, and got some real nice splashes. (better than the accepted solution! :( lol.
如果您需要对此进行更多故障排除，我建议您注释掉散布部分(或将其值设为零)，您可以自行检查水的弹性.这使得 T/S 变得更加容易.
If you need to troubleshoot this some more, I would suggest you comment out the spreading piece (or give it a value of zero) and you can check the springiness of the water by itself. This made it much easier to T/S.
import pygame, random
import math as m
from pygame import *
pygame.init()
WINDOW_SIZE = (854, 480)
screen = pygame.display.set_mode(WINDOW_SIZE,0,32) # initiate the window
clock = pygame.time.Clock()
font = pygame.font.SysFont("Arial", 18)
class surface_water_particle():
k = 0.04 # spring constant
d = 0.08 # damping constant
def __init__(self, x,y):
self.x_pos = x
self.y_pos = y
self.target_y = y
self.velocity = 0
def update(self):
x = self.y_pos - self.target_y # displacement of "spring"
a = -self.k * x - self.d * self.velocity # unit of acceleration
self.y_pos += self.velocity
self.velocity += a
class water():
def __init__(self, x_start, x_end, y_start, y_end, segment_length):
self.springs = []
self.x_start = x_start
self.y_start = y_start
self.x_end = x_end
self.y_end = y_end - 10
for i in range(abs(x_end - x_start) // segment_length):
self.springs.append(surface_water_particle(i * segment_length + x_start, y_end))
def update(self, spread):
passes = 4 # more passes = more splash spreading
for i in range(len(self.springs)):
self.springs[i].update()
leftDeltas = [0] * len(self.springs)
rightDeltas = [0] * len(self.springs)
for p in range(passes):
for i in range(0, len(self.springs) -1 ):
if i > 0:
leftDeltas[i] = spread * (self.springs[i].y_pos - self.springs[i - 1].y_pos)
self.springs[i - 1].velocity += leftDeltas[i]
if i < len(self.springs) - 1:
rightDeltas[i] = spread * (self.springs[i].y_pos - self.springs[i + 1].y_pos)
self.springs[i + 1].velocity += rightDeltas[i]
for i in range(0, len(self.springs) -1):
if i > 0:
self.springs[i - 1].y_pos += leftDeltas[i] # you were updating velocity here!
if i < len(self.springs) - 1:
self.springs[i + 1].y_pos += rightDeltas[i]
def splash(self, index, speed):
if index > 0 and index < len(self.springs) :
self.springs[index].velocity = speed
def draw(self):
water_surface = pygame.Surface((abs(self.x_start - self.x_end), abs(self.y_start - self.y_end))).convert_alpha()
water_surface.fill((0,0,0,0))
water_surface.set_colorkey((0,0,0,0))
polygon_points = []
polygon_points.append((self.x_start, self.y_start))
for spring in range(len(self.springs)):
polygon_points.append((water_test.springs[spring].x_pos, water_test.springs[spring].y_pos))
polygon_points.append((water_test.springs[len(self.springs) - 1].x_pos, self.y_start))
#pygame.draw.polygon(water_surface, (0,0,255), polygon_points)
for spring in range(0,len(self.springs) - 1):
pygame.draw.line(screen, (0,0,255), (water_test.springs[spring].x_pos, water_test.springs[spring].y_pos), (water_test.springs[spring + 1].x_pos, water_test.springs[spring + 1].y_pos), 2)
#water_surface.set_alpha(100)
return water_surface
def update_fps():
fps_text = font.render(str(int(clock.get_fps())), 1, pygame.Color("coral"))
screen.blit(fps_text, (0,0))
water_test = water(0,800,200,200, 3)
while True:
screen.fill((255,255,255))
water_test.update(0.025)
screen.blit(water_test.draw(), (0,0))
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
if event.type == MOUSEBUTTONDOWN:
water_test.splash(50,100)
pygame.display.update()
clock.tick(60)
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