所以我有这种迷你粒子效果会产生向上移动的圆圈。我想让它看起来像烟雾。我遇到了很多问题。
我的代码
import pygame,random
from pygame.locals import *
xmax = 1000 #width of window
ymax = 600 #height of window
class Particle():
def __init__(self, x, y, dx, dy, col):
self.x = x
self.y = y
self.col = col
self.ry = y
self.rx = x
self.dx = dx
self.dy = dy
def move(self):
if self.y >= 10:
if self.dy < 0:
self.dy = -self.dy
self.ry -= self.dy
self.y = int(self.ry + 0.5)
self.dy -= .1
if self.y < 1:
self.y += 500
def main():
pygame.init()
screen = pygame.display.set_mode((xmax,ymax))
white = (255, 255, 255)
black = (0,0,0)
grey = (128,128,128)
particles = []
for part in range(25):
if part % 2 > 0: col = black
else: col = grey
particles.append( Particle(random.randint(500, 530), random.randint(0, 500), 0, 0, col))
exitflag = False
while not exitflag:
for event in pygame.event.get():
if event.type == QUIT:
exitflag = True
elif event.type == KEYDOWN:
if event.key == K_ESCAPE:
exitflag = True
screen.fill(white)
for p in particles:
p.move()
pygame.draw.circle(screen, p.col, (p.x, p.y), 8)
pygame.display.flip()
pygame.quit()
if __name__ == "__main__":
main()
答案 0 :(得分：3)
我对您的代码进行了一些重大修改。对于初学者来说，我清理了很多课程。让我们从参数和__init__函数开始。
首先，粒子不是降低500来重置，而是转到设置为起点的位置。它开始的位置现在在__init__函数中随机选择，而不是在游戏中。我也摆脱了一些不必要的争论。
在班级的move函数中，我简化了一下。为了让粒子检测它是否应该复位，它只是看到它是否高于0.上升只是y的简单减少1.我添加的变化是x随机变化并向右移动走了。这将使烟雾看起来更好/更真实。
我没有对其余代码进行太多更改。我改变了对Particle类的调用以适应新的参数。我制作了更多的粒子，再一次用于视觉效果。我还大幅减少了绘制的圆圈的大小（你能猜到吗？）视觉效果。我还在一个时钟中加入，以防止粒子以超音速运行。
这是最终的代码。我希望你喜欢它。
import pygame,random
from pygame.locals import *
xmax = 1000 #width of window
ymax = 600 #height of window
class Particle():
def __init__(self, startx, starty, col):
self.x = startx
self.y = random.randint(0, starty)
self.col = col
self.sx = startx
self.sy = starty
def move(self):
if self.y < 0:
self.x=self.sx
self.y=self.sy
else:
self.y-=1
self.x+=random.randint(-2, 2)
def main():
pygame.init()
screen = pygame.display.set_mode((xmax,ymax))
white = (255, 255, 255)
black = (0,0,0)
grey = (128,128,128)
clock=pygame.time.Clock()
particles = []
for part in range(300):
if part % 2 > 0: col = black
else: col = grey
particles.append( Particle(515, 500, col) )
exitflag = False
while not exitflag:
for event in pygame.event.get():
if event.type == QUIT:
exitflag = True
elif event.type == KEYDOWN:
if event.key == K_ESCAPE:
exitflag = True
screen.fill(white)
for p in particles:
p.move()
pygame.draw.circle(screen, p.col, (p.x, p.y), 2)
pygame.display.flip()
clock.tick(50)
pygame.quit()
if __name__ == "__main__":
main()
为了在代码中添加粒子，只需执行上面代码中的操作即可。它工作正常。如果你想做一些事情来显示烟雾，只需在你的参数中加一个暂停时间并禁止烟雾的移动，直到经过了那段时间。添加了新类：
class Particle():
def __init__(self, startx, starty, col, pause):
self.x = startx
self.y = starty
self.col = col
self.sx = startx
self.sy = starty
self.pause = pause
def move(self):
if self.pause==0:
if self.y < 0:
self.x=self.sx
self.y=self.sy
else:
self.y-=1
self.x+=random.randint(-2, 2)
else:
self.pause-=1
创建新粒子所需的代码：
for part in range(1, A):
if part % 2 > 0: col = black
else: col = grey
particles.append( Particle(515, B, col, round(B*part/A)) )
A和B是变量（我推荐A为约300，B为Y值）
新代码将使粒子在起始位置产生，并且不断上升而不会中断。希望你喜欢。
答案 1 :(得分：0)
我对您的代码进行了很多更改，尤其是在Particle类中
虽然这段代码中有一些令人费解的东西，但它比你当前的代码更灵活。
下面，
我很清楚地重写了你Particle课
除了更改__init__之外，要采用多个参数（确切地说是7个），
我使用了三角函数和math模块来move粒子，使其更容易管理（如果你擅长数学！）。我还在bounce添加了draw和Particle方法，使代码更具可读性。
就像@PygameNerd一样，我添加了一个时钟，用于限制最大fps。
我没有更改任何事件处理，但在bounce循环中使用了draw和for p in particles:个函数。
import pygame, random, math
def radians(degrees):
return degrees*math.pi/180
class Particle:
def __init__(self, (x, y), radius, speed, angle, colour, surface):
self.x = x
self.y = y
self.speed = speed
self.angle = angle
self.radius = 3
self.surface = surface
self.colour = colour
self.rect = pygame.draw.circle(surface,(255,255,0),
(int(round(x,0)),
int(round(y,0))),
self.radius)
def move(self):
""" Update speed and position based on speed, angle """
# for constant change in position values.
self.x += math.sin(self.angle) * self.speed
self.y -= math.cos(self.angle) * self.speed
# pygame.rect likes int arguments for x and y
self.rect.x = int(round(self.x))
self.rect.y = int(round(self.y))
def draw(self):
""" Draw the particle on screen"""
pygame.draw.circle(self.surface,self.colour,self.rect.center,self.radius)
def bounce(self):
""" Tests whether a particle has hit the boundary of the environment """
if self.x > self.surface.get_width() - self.radius: # right
self.x = 2*(self.surface.get_width() - self.radius) - self.x
self.angle = - self.angle
elif self.x < self.radius: # left
self.x = 2*self.radius - self.x
self.angle = - self.angle
if self.y > self.surface.get_height() - self.radius: # bottom
self.y = 2*(self.surface.get_height() - self.radius) - self.y
self.angle = math.pi - self.angle
elif self.y < self.radius: # top
self.y = 2*self.radius - self.y
self.angle = math.pi - self.angle
def main():
xmax = 640 #width of window
ymax = 480 #height of window
white = (255, 255, 255)
black = (0,0,0)
grey = (128,128,128)
pygame.init()
screen = pygame.display.set_mode((xmax,ymax))
clock = pygame.time.Clock()
particles = []
for i in range(1000):
if i % 2:
colour = black
else:
colour = grey
# for readability
x = random.randint(0, xmax)
y = random.randint(0, ymax)
speed = random.randint(0,20)*0.1
angle = random.randint(0,360)
radius = 3
particles.append( Particle((x, y), radius, speed, angle, colour, screen) )
done = False
while not done:
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
break
elif event.type == pygame.KEYDOWN:
if event.key == pygame.K_ESCAPE:
done = True
break
if done:
break
screen.fill(white)
for p in particles:
p.move()
p.bounce()
p.draw()
clock.tick(40)
pygame.display.flip()
pygame.quit()
if __name__ == "__main__":
main()