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How can I change the direction in which a bullet moves after it has been shot?

So, I'm trying to make a bullet curve in a spiral shape.
However, I end up with the bullets freezing in place and moving in a circle instead of forward.
Here is my bullet class code:
class Bullet(pygame.sprite.Sprite): #bullet class
def __init__(self, pos, img, angle=0, speed=10, acceleration=0, curve=10):
super().__init__()
#import image.
self.dir = angle
self.angle = (180 / math.pi) * -angle - 90
#turns towards the mouse
self.image = pygame.transform.rotate(img, self.angle)
self.rect = self.image.get_rect()
self.pos = list(pos)
self.spd = speed
self.acl = acceleration
self.curve = curve
self.wave = 0
#start lifetime of bullet
self.born = pygame.time.get_ticks()
def update(self):
#destroys itself if more than 10 secs have past from birth
self.live = pygame.time.get_ticks()
if self.live - self.born > 10000:
bullets.remove(self)
all_sprites_list.remove(self)
#update stats of bullet
self.dir += self.curve
self.spd += self.acl
#move the bullet
self.pos[0] += math.cos(self.dir) * self.spd
self.pos[1]+= math.sin(self.dir) * self.spd
self.rect.center = self.pos

Here is an example that creates spiral pathing bullets when right-clicking. Left-click generated bullets travel horizontally.
I have commented out the command to fill the frame so that you can see the path the bullet takes.
import pygame
import math
import random
width = 800
height = 600
pygame.init()
screen = pygame.display.set_mode((width, height))
clock = pygame.time.Clock()
class Bullet(pygame.sprite.Sprite):
"""Horizontally travelling bullet"""
def __init__(self, pos, color="grey16"):
super().__init__()
self.image = pygame.Surface((12, 5))
self.image.fill(color)
self.rect = self.image.get_rect(center=pos)
def move(self):
"""Move the bullet."""
self.rect.x += 5
def update(self):
"""Move and check for offscreen disposal"""
self.move()
# Remove the bullet if it flies up off the screen
if not 0 < self.rect.x < width + 12:
# print(f"Destroying {self} {self.rect.center} X")
self.kill() # Remove the sprite from all sprite groups.
elif not 0 < self.rect.y < height:
# print(f"Destroying {self} {self.rect.center} Y")
self.kill()
class SpiralBullet(Bullet):
"""Bullet sprite that moves in a spiral"""
def __init__(self, pos):
super().__init__(pos, "violetred")
# need to track the age to determine spiral position
self.start_tick = pygame.time.get_ticks()
self.start_pos = pos
self.angv = 0.1 # Angular Velocity
self.v = 2.0 # Velocity
def move(self):
"""Move in a spiral pattern"""
dt = pygame.time.get_ticks() - self.start_tick
if dt > 0:
dt = dt / 100 # slow it down
self.rect.x = (self.v * dt) * math.cos(self.angv * dt) + self.start_pos[0]
self.rect.y = (self.v * dt) * math.sin(self.angv * dt) + self.start_pos[1]
class Target(pygame.sprite.Sprite):
def __init__(self):
super().__init__()
self.image = pygame.Surface((30, 50))
self.image.fill("orange")
self.rect = self.image.get_rect()
# create at the right of the screen
self.rect.x = width // 1.2
self.rect.y = random.randint(50, height - 50)
self.lives = 3
def update(self):
if self.lives <= 0:
self.kill() # Remove the sprite from all sprite groups.
# Create Groups for tracking sprites
all_sprites_list = pygame.sprite.Group()
bullets = pygame.sprite.Group()
targets = pygame.sprite.Group()
score = 0
screen.fill("turquoise") # initial fill incase we disable per frame fill
done = False
while not done:
## Handle Events
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
elif event.type == pygame.MOUSEBUTTONDOWN:
# Click a mouse button to instantiate a bullet.
if event.button == 3: # right-click for SpiralBullet
bullet = SpiralBullet(event.pos)
all_sprites_list.add(bullet)
bullets.add(bullet)
else:
bullet = Bullet(event.pos)
all_sprites_list.add(bullet)
bullets.add(bullet)
## Game State update
# Create a target if there aren't any
if not targets:
target = Target()
all_sprites_list.add(target)
targets.add(target)
# Call the update() method on all the sprites.
all_sprites_list.update()
# Check which bullets have collided with the Target.
collided_bullets = pygame.sprite.groupcollide(bullets, targets, True, False)
for bullet in collided_bullets:
score += 1 # Increment the score.
target.lives -= 1 # Decrement the lives.
## Draw a frame
# screen.fill("turquoise") # comment to see path
all_sprites_list.draw(screen)
## Update the display
pygame.display.flip()
pygame.display.set_caption(f"Score: {score}")
clock.tick(60)
pygame.quit()
This will show something like:
Here the lower orange target was created first and was hit by two spiral bullets and a horizontal bullet causing the higher target to spawn.

AttributeError: 'Player' object has no attribute 'gun' [duplicate]

I am creating an Asteroids type game using Pygame and am having trouble firing projectiles. I have a sprite group for the projectile object and some code to add the projectile.
if pressed[pygame.K_SPACE]:
projectiles.add(Projectile(player.rect.x, player.rect.y, player.direction))
Problem is when I press space in game to fire the projectile I get the error "add() argument after * must be an iterable, not int".
I have a very similar statement for adding asteroids when the game first starts without any issues so I'm not really sure what the problem is. I'll leave the rest of the code below. The add statement giving issues is in the main function near the bottom. Any help is appreciated.
#Import Modules
import pygame
import math
import random
#Movement Function
def calculate_new_xy(old_xy,speed,direction):
new_x = old_xy[0] + (speed*math.cos(direction))
new_y = old_xy[1] + (speed*math.sin(direction))
return new_x, new_y
#Collision Function
def isColliding(x, y, xTo, yTo, size):
if x > xTo - size and x < xTo + size and y > yTo - size and y < yTo + size:
return True
return False
#Draw Text Function
def drawText(msg, color, x, y, s, center=True):
screen_text = pygame.font.SysFont("Impact", s).render(msg, True, color)
if center:
rect = screen_text.get_rect()
rect.center = (x, y-50)
else:
rect = (x, y)
display.blit(screen_text, rect)
#Initialize Variables
#Colors
white = (255, 255, 255)
black = (0, 0, 0)
#Display Height/Width
display_width = 800
display_height = 600
#Asteroid Class
class Asteroid(pygame.sprite.Sprite):
#Initialize values
def __init__(self, pos=(0, 0)):
#Initialize sprite class
pygame.sprite.Sprite.__init__(self)
#Asteroid sprite
self.asteroid = pygame.image.load("asteroid.png").convert()
self.image = self.asteroid
#Rectangle
self.rect = self.image.get_rect()
self.rect.center = pos
#Initialize random starting angle
self.angle = random.randint(0, 360)
#Asteroid random Speed
self.speed = random.randint(2, 3)
#Asteroid random direction
self.direction = math.radians(random.randrange(0, 360, 3))
#Update asteroid object
def update(self):
#Constantly rotate asteroid
self.angle -= 3 % 360
#Get image angle and position
self.image = pygame.transform.rotate(self.asteroid, self.angle*-1)
#Use rectangle to get center of image
#Save ship's current center.
x, y = self.rect.center
#Replace old rect with new rect.
self.rect = self.image.get_rect()
#Put the new rect's center at old center.
self.rect.center = (x, y)
#Move Asteroid
self.rect.center = calculate_new_xy(self.rect.center,self.speed,self.direction)
#Screen Border
#Moves the asteroid to the opposite side of the screen if they go outside the border
if self.rect.x > display_width:
self.rect.x = -20
elif self.rect.x < -20:
self.rect.x = display_width
elif self.rect.y > display_height:
self.rect.y = -20
elif self.rect.y < -20:
self.rect.y = display_height
#Projectile Class
class Projectile(pygame.sprite.Sprite):
#Initialize values
def _init_(self,x,y,direction):
self.x = x
self.y = y
self.dir = direction
self.ttl = 30
#Update projectile object
def update(self):
#Changing direction
self.x += projectilespd * math.cos(self.direction)
self.y += projectilespd * math.sin(self.direction)
#Draw projectile
pygame.draw.circle(display, white, (self.x,self.y),1)
#Screen Border
if self.x > display_width:
self.x = 0
elif self.x < 0:
self.x = display_width
elif self.y > display_height:
self.y = 0
elif self.y < 0:
self.y = display_height
self.ttl -= 1
#Player Class
class Player(pygame.sprite.Sprite):
#Initialize ship sprite, angle lines, and rectangle
def __init__(self, pos=(0, 0), size=(200, 200)):
#Player sprite
self.ship = pygame.image.load("ship.png").convert()
self.image = self.ship
#Rectangle
self.rect = self.image.get_rect()
self.rect.center = pos
#Initialize angle
self.angle = 0
#Initialize direction
self.direction = 0
#Update player object
def update(self):
#Rotation
pressed = pygame.key.get_pressed()
if pressed[pygame.K_LEFT]: self.angle -= 3 % 360
if pressed[pygame.K_RIGHT]: self.angle += 3 % 360
#Get image angle and position
self.image = pygame.transform.rotate(self.ship, self.angle*-1)
#Use rectangle to get center of image
#Save ship's current center.
x, y = self.rect.center
#Replace old rect with new rect.
self.rect = self.image.get_rect()
#Put the new rect's center at old center.
self.rect.center = (x, y)
#Convert angle to radians
self.direction = math.radians(self.angle-90)
#Increase speed if Up is pressed
if pressed[pygame.K_UP]: self.speed = 5
else: self.speed = 0
#Move Ship
self.rect.center = calculate_new_xy(self.rect.center,self.speed,self.direction)
#Screen Border
#Moves the player to the opposite side of the screen if they go outside the border
if self.rect.x > display_width:
self.rect.x = -50
elif self.rect.x < -50:
self.rect.x = display_width
elif self.rect.y > display_height:
self.rect.y = -50
elif self.rect.y < -50:
self.rect.y = display_height
#Main Function
def main(gameState):
#Player starting position
player = Player(pos=(400, 300))
#Asteroid group
asteroids = pygame.sprite.Group()
#Projectile group
projectiles = pygame.sprite.Group()
#Create asteroids
for x in range(8):
asteroids.add(Asteroid(pos=(100 + (x*120), 100 + (x*20))))
while True:
for event in pygame.event.get():
#closes game
if event.type == pygame.QUIT:
done = True
pygame.quit()
exit()
#Game Menu
while gameState == "Menu":
#Fill background
display.fill((0,0,0))
#Display menu text
drawText("ASTEROIDS", white, display_width / 2, display_height / 2, 150)
drawText("Press any key to START", white, display_width / 2, display_height / 2 + 120, 40)
#Check game start or end
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
pygame.quit()
exit()
if event.type == pygame.KEYDOWN:
gameState = "Playing"
pygame.display.update()
#Low frame rate for menu
clock.tick(5)
#Get key inputs
pressed = pygame.key.get_pressed()
#Fill background
display.fill(black)
#Check for player collision with asteroid
for asteroid in asteroids:
if gameState != "Game Over":
if isColliding(player.rect.x, player.rect.y, asteroid.rect.x, asteroid.rect.y, 30):
gameState = "Game Over"
#Update and draw player if not game over
if gameState != "Game Over":
#Update player
player.update()
#Draw player
display.blit(player.image, player.rect)
#Update asteroids
asteroids.update()
#Draw asteroids
asteroids.draw(display)
#Fire Projectiles
if pressed[pygame.K_SPACE]:
projectiles.add(Projectile(player.rect.x, player.rect.y, player.direction))
#Update projectiles
projectiles.update()
#Draw projectiles
projectiles.draw(display)
#Display Game Over and restart option
if gameState == "Game Over":
drawText("GAME OVER", white, display_width / 2, display_height / 2, 150)
drawText("Press R to restart", white, display_width / 2, display_height / 2 + 120, 40)
if pressed[pygame.K_r]:
main(gameState = "Playing")
#Makes updates to the game screen
pygame.display.update()
#Frame rate
clock.tick(60)
#Initialize Game
if __name__ == '__main__':
#initialize pygame
pygame.init()
#initialize display settings
display = pygame.display.set_mode((display_width,display_height))
pygame.display.set_caption('Asteroids')
#initialize game clock
clock = pygame.time.Clock()
#start main function
main(gameState = "Menu")

The issue is not the pygame.sprite.Group.add operation, but the obejct you want to add is not a pygame.sprite.Sprite object, because the object is not constructed at all.
You missed to the super call in the constructor of Projectile. Furthermore the name of the constructor has to be __init__ rather _init_:
class Projectile(pygame.sprite.Sprite):
#Initialize values
def __init__(self,x,y,direction):
super.__init__()
self.x = x
self.y = y
self.dir = direction
self.ttl = 30

when the rectangle descends the ramp, the rectangle shakes

I don't know if there is a better way to implement ramps.
First i calculate the points that belong to the hipotenuse and use collidepoint to see if there is a collision between the rectangle and any point that belongs to the hipotenuse, then i update the rectangle based on the point where there was a collision.
Being careful when the rectangle is at the top of the ramp.
The rectangle ascends the ramp perfectly, but when the rectangle descends the ramp, the rectangle shakes.
import sys
import pygame
from pygame.locals import *
pygame.init()
fps = 60
fpsClock = pygame.time.Clock()
width, height = 640, 480
screen = pygame.display.set_mode((width, height))
def draw_grid():
for y in range(0,height,32):
pygame.draw.line(screen,'red',(0,y),(width,y))
for x in range(0,width,32):
pygame.draw.line(screen,'red',(x,0),(x,height))
class Ramp(pygame.sprite.Sprite):
def __init__(self, x, y, width, height, color):
super().__init__()
self.image = pygame.Surface((width, height), pygame.SRCALPHA)
#self.image.fill('green')
pygame.draw.polygon(self.image, color,
points=[(0, 0), (0, height), (width, height)])
self.rect = self.image.get_rect(topleft=(x, y))
class Player(pygame.sprite.Sprite):
def __init__(self,x,y):
super().__init__()
self.image = pygame.Surface((32, 32))
self.image.fill('blue')
self.rect = self.image.get_rect(topleft=(x,y))
self.speed = 5
self.direction = pygame.math.Vector2(0,0)
self.gravity = 0.9
self.initial_jump = -20
self.on_ground = True
def apply_gravity(self):
self.direction.y += self.gravity
self.rect.y += self.direction.y
def move(self):
keys=pygame.key.get_pressed()
if keys[K_LEFT]:
self.direction.x = -self.speed
elif keys[K_RIGHT]:
self.direction.x = self.speed
else:
self.direction.x = 0
if keys[K_UP] and self.on_ground:
self.direction.y = self.initial_jump
self.on_ground = False
self.rect.x += self.direction.x
def check_borders(self):
if self.rect.x <= 0:
self.rect.x = 0
if self.rect.right >= width:
self.rect.right = width
if self.rect.bottom >= height:
self.rect.bottom = height
self.direction.y = 0
self.on_ground = True
if self.rect.colliderect(ramp_rect):
if self.direction.x > 0 and abs(self.rect.right-ramp_rect.left) <= 5:
self.rect.right = ramp_rect.left
# ramp stuff
for p in hypotenuse_points:
if self.rect.collidepoint(p):
if self.rect.left >= ramp_rect.left:
self.rect.bottomleft = p
else:
self.rect.bottom = ramp_rect.top
self.on_ground = True
self.direction.y = 0
def update(self):
self.move()
self.apply_gravity()
self.check_borders()
player = pygame.sprite.GroupSingle(Player(12*32,10*32))
ramp = pygame.sprite.GroupSingle(Ramp(5*32,10*32,7*32,5*32,'red'))
ramp_rect = ramp.sprite.rect
m = (ramp_rect.height)/( ramp_rect.width)
x1,y1 = ramp_rect.topleft
hypotenuse_points = []
for x in range(ramp_rect.left,ramp_rect.right):
hypotenuse_points.append((x,m*(x-x1)+y1)) # Point-slope equation
while True:
screen.fill('white')
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
sys.exit()
ramp.draw(screen)
player.update()
player.draw(screen)
#draw_grid()
pygame.draw.lines(screen,'black',False,hypotenuse_points,3)
pygame.display.update()
fpsClock.tick(fps)

There is no problem with your code. Only gravity is too weak. The movement is so fast that gravity is acting too late. Note that instead of moving down the slope, you move to the right and then fall.
Of course there is one problem with your code. Since pygame.Rect is supposed to represent an area on the screen, a pygame.Rect object can only store integral data.
The coordinates for Rect objects are all integers. [...]
The fraction part of the coordinates gets lost when the new position of the object is assigned to the Rect object. If this is done every frame, the position error will accumulate over time.
If you want to store object positions with floating point accuracy, you have to store the location of the object in separate variables respectively attributes and to synchronize the pygame.Rect object. round the coordinates and assign it to the location of the rectangle.
Instead of the list of points I suggest to compute the height of the ramp under the palyer:
if self.rect.colliderect(ramp_rect):
ratio = ramp_rect.height / ramp_rect.width
self.rect.bottom = ramp_rect.bottom - (ramp_rect.right - max(self.rect.left, ramp_rect.left)) * ratio
self.y = self.rect.y
Complete example:
import sys
import pygame
from pygame.locals import *
pygame.init()
fps = 60
fpsClock = pygame.time.Clock()
width, height = 640, 480
screen = pygame.display.set_mode((width, height))
def draw_grid():
for y in range(0,height,32):
pygame.draw.line(screen,'red',(0,y),(width,y))
for x in range(0,width,32):
pygame.draw.line(screen,'red',(x,0),(x,height))
class Ramp(pygame.sprite.Sprite):
def __init__(self, x, y, width, height, color):
super().__init__()
self.image = pygame.Surface((width, height), pygame.SRCALPHA)
#self.image.fill('green')
pygame.draw.polygon(self.image, color,
points=[(0, 0), (0, height), (width, height)])
self.rect = self.image.get_rect(topleft=(x, y))
class Player(pygame.sprite.Sprite):
def __init__(self,x,y):
super().__init__()
self.image = pygame.Surface((32, 32))
self.image.fill('blue')
self.rect = self.image.get_rect(topleft=(x,y))
self.x, self.y = self.rect.topleft
self.speed = 5
self.direction = pygame.math.Vector2(0,0)
self.gravity = 0.9
self.initial_jump = -20
self.on_ground = True
def apply_gravity(self):
self.direction.y += self.gravity
self.y += self.direction.y
self.rect.y = round(self.y)
def move(self):
keys = pygame.key.get_pressed()
self.direction.x = (keys[K_RIGHT] - keys[K_LEFT]) * self.speed
if keys[K_UP] and self.on_ground:
self.direction.y = self.initial_jump
self.on_ground = False
self.x += self.direction.x
self.rect.x = round(self.x)
def check_borders(self):
if self.rect.x <= 0:
self.rect.x = 0
self.x = self.rect.x
if self.rect.right >= width:
self.rect.right = width
self.x = self.rect.x
if self.rect.bottom >= height:
self.rect.bottom = height
self.direction.y = 0
self.on_ground = True
self.y = self.rect.y
if self.rect.colliderect(ramp_rect):
if self.old_rect.right-1 <= ramp_rect.left:
self.rect.right = ramp_rect.left
self.x = self.rect.x
else:
ratio = ramp_rect.height / ramp_rect.width
bottom = ramp_rect.bottom - (ramp_rect.right - max(self.rect.left, ramp_rect.left)) * ratio
if self.on_ground or self.rect.bottom > bottom:
self.rect.bottom = bottom
self.y = self.rect.y
self.direction.y = 0
self.on_ground = True
def update(self):
self.old_rect = self.rect.copy()
self.move()
self.apply_gravity()
self.check_borders()
player = pygame.sprite.GroupSingle(Player(12*32,10*32))
ramp = pygame.sprite.GroupSingle(Ramp(5*32,10*32,7*32,5*32,'red'))
ramp_rect = ramp.sprite.rect
m = (ramp_rect.height)/( ramp_rect.width)
x1,y1 = ramp_rect.topleft
while True:
screen.fill('white')
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
sys.exit()
ramp.draw(screen)
player.update()
player.draw(screen)
pygame.display.update()
fpsClock.tick(fps)

How to shoot bullets from a character facing in direction of cursor in pygame?

In my game the problem is that bullets are coming only from one place i.e, from the center. As my player rotates in direction of cursor, I want the bullets to be shot from top of the player even if the player is rotated and travel in a straight line in the direction player is facing towards, As the player rotates in the direction of cursor.
As you can view here the the bullets are always in same direction and always come out of same place.
I tried to use getpos() method to get cursor position and tried to subtract from the player coordinates but failed to get the result.
I think the problem is within the def shoot(self) method of Rotator class, I need to get the coordinates spaceship's tip even when it is rotating all time.
import math
import random
import os
import pygame as pg
import sys
pg.init()
height=650
width=1200
os_x = 100
os_y = 45
os.environ['SDL_VIDEO_WINDOW_POS'] = "%d,%d" % (os_x,os_y)
screen = pg.display.set_mode((width,height),pg.NOFRAME)
screen_rect = screen.get_rect()
background=pg.image.load('background.png').convert()
background = pg.transform.smoothscale(pg.image.load('background.png'), (width,height))
clock = pg.time.Clock()
running = True
class Mob(pg.sprite.Sprite):
def __init__(self):
pg.sprite.Sprite.__init__(self)
self.image = pg.image.load('enemy.png').convert_alpha()
self.image = pg.transform.smoothscale(pg.image.load('enemy.png'), (33,33))
self.rect = self.image.get_rect()
self.rect.x = random.randrange(width - self.rect.width)
self.rect.y = random.randrange(-100, -40)
self.speedy = random.randrange(1, 8)
self.speedx = random.randrange(-3, 3)
def update(self):
self.rect.x += self.speedx
self.rect.y += self.speedy
if self.rect.top > height + 10 or self.rect.left < -25 or self.rect.right > width + 20:
self.rect.x = random.randrange(width - self.rect.width)
self.rect.y = random.randrange(-100, -40)
self.speedy = random.randrange(1, 8)
class Rotator(pg.sprite.Sprite):
def __init__(self, screen_rect):
pg.sprite.Sprite.__init__(self)
self.screen_rect = screen_rect
self.master_image = pg.image.load('spaceship.png').convert_alpha()
self.master_image = pg.transform.smoothscale(pg.image.load('spaceship.png'), (33,33))
self.image = self.master_image.copy()
self.rect = self.image.get_rect(center=[width/2,height/2])
self.delay = 10
self.timer = 0.0
self.angle = 0
self.distance = 0
self.angle_offset = 0
def get_angle(self):
mouse = pg.mouse.get_pos()
offset = (self.rect.centerx - mouse[0], self.rect.centery - mouse[1])
self.angle = math.degrees(math.atan2(*offset)) - self.angle_offset
old_center = self.rect.center
self.image = pg.transform.rotozoom(self.master_image, self.angle,1)
self.rect = self.image.get_rect(center=old_center)
self.distance = math.sqrt((offset[0] * offset[0]) + (offset[1] * offset[1]))
def update(self):
self.get_angle()
self.display = 'angle:{:.2f} distance:{:.2f}'.format(self.angle, self.distance)
self.dx = 1
self.dy = 1
self.rect.clamp_ip(self.screen_rect)
def draw(self, surf):
surf.blit(self.image, self.rect)
def shoot(self):
bullet = Bullet(self.rect.centerx, self.rect.centery)
all_sprites.add(bullet)
bullets.add(bullet)
class Bullet(pg.sprite.Sprite):
def __init__(self, x, y):
pg.sprite.Sprite.__init__(self)
self.image = pg.image.load('bullet.png').convert_alpha()
self.image = pg.transform.smoothscale(pg.image.load('bullet.png'), (10,10))
self.rect = self.image.get_rect()
self.rect.y = y
self.rect.x = x
self.speedy = -8
def update(self):
self.rect.y += self.speedy
# kill if it moves off the top of the screen
if self.rect.bottom < 0:
self.kill()
all_sprites = pg.sprite.Group()
bullets = pg.sprite.Group()
mobs = pg.sprite.Group()
rotator = Rotator(screen_rect)
all_sprites.add(rotator)
for i in range(5):
m = Mob()
all_sprites.add(m)
mobs.add(m)
while running:
keys = pg.key.get_pressed()
for event in pg.event.get():
if event.type == pg.QUIT:
sys.exit()
pygame.quit()
if event.type == pg.MOUSEBUTTONDOWN:
rotator.shoot()
screen.blit(background, [0, 0])
all_sprites.update()
hits = pg.sprite.groupcollide(mobs, bullets, True, True)
for hit in hits:
m = Mob()
all_sprites.add(m)
mobs.add(m)
hits = pg.sprite.spritecollide(rotator, mobs, False)
if hits:
running = False
all_sprites.draw(screen)
clock.tick(60)
pg.display.update()

See Shooting a bullet in pygame in the direction of mouse and calculating direction of the player to shoot pygame.
Pass the mouse position to rotator.shoot(), when the mouse button is pressed:
if event.type == pg.MOUSEBUTTONDOWN:
rotator.shoot(event.pos)
Calculate the direction of from the rotator to the mouse position and pass it the constructor of the new bullet object:
def shoot(self, mousepos):
dx = mousepos[0] - self.rect.centerx
dy = mousepos[1] - self.rect.centery
if abs(dx) > 0 or abs(dy) > 0:
bullet = Bullet(self.rect.centerx, self.rect.centery, dx, dy)
all_sprites.add(bullet)
bullets.add(bullet)
Use pygame.math.Vector2 to store the current positon of the bullet and the normalized direction of the bullet (Unit vector):
class Bullet(pg.sprite.Sprite):
def __init__(self, x, y, dx, dy):
pg.sprite.Sprite.__init__(self)
self.image = pg.transform.smoothscale(pg.image.load('bullet.png').convert_alpha(), (10,10))
self.rect = self.image.get_rect()
self.rect.center = (x, y)
self.speed = 8
self.pos = pg.math.Vector2(x, y)
self.dir = pg.math.Vector2(dx, dy).normalize()
Calcualate the new position of the bullet in update() (self.pos += self.dir * self.speed) and update the .rect attribute by the new position.
.kill() the bullet when it leaves the screen. This can be checked by self.rect.colliderect():
class Bullet(pg.sprite.Sprite):
# [...]
def update(self):
self.pos += self.dir * self.speed
self.rect.center = (round(self.pos.x), round(self.pos.y))
if not self.rect.colliderect(0, 0, width, height):
self.kill()

player walking on predetermined path pygame

I am new to pygame and I am trying to make a game where the player has to bypass some enemy's to get to a point where you can go to the next level. I need the enemy's to walk back and forward on a predetermined path but I can't figure out how to do it. So I was wondering if there is an easy way to do this?
This is my code.
import pygame
import random
import os
import time
from random import choices
from random import randint
pygame.init()
a = 0
b = 0
width = 1280
height = 720
screen = pygame.display.set_mode((width, height))
pygame.display.set_caption("Game")
done = False
n = 0
x = 0
y = 0
x_wall = 0
y_wall = 0
clock = pygame.time.Clock()
WHITE = (255,255,255)
RED = (255,0,0)
change_x = 0
change_y = 0
HW = width / 2
HH = height / 2
background = pygame.image.load('mountains.png')
#player class
class Player(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.image.load("character.png")
self.rect = self.image.get_rect()
self.rect.x = width / 2
self.rect.y = height / 2
#enemy class
class Enemy(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.image.load("enemy.png")
self.image = pygame.transform.scale(self.image, (int(50), int(50)))
self.rect = self.image.get_rect()
self.rect.x = width / 3
self.rect.y = height / 3
#wall class
class Wall(pygame.sprite.Sprite):
def __init__(self, x, y):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.image.load("wall.png")
self.image = pygame.transform.scale(self.image, (int(50), int(50)))
self.rect = self.image.get_rect()
self.rect.x = x
self.rect.y = y
#wall movement
def update(self):
self.vx = 0
self.vy = 0
key = pygame.key.get_pressed()
if key[pygame.K_LEFT]:
self.vx = 5
self.vy = 0
elif key[pygame.K_RIGHT]:
self.vx = -5
self.vy = 0
if key[pygame.K_UP]:
self.vy = 5
self.vx = 0
elif key[pygame.K_DOWN]:
self.vy = -5
self.vx = 0
self.rect.x = self.rect.x + self.vx
self.rect.y = self.rect.y + self.vy
#player sprite group
sprites = pygame.sprite.Group()
player = Player()
sprites.add(player)
#enemy sprite group
enemys = pygame.sprite.Group()
enemy = Enemy()
enemy2 = Enemy()
enemys.add(enemy, enemy2)
#all the wall sprites
wall_list = pygame.sprite.Group()
wall = Wall(x_wall, y_wall)
wall2 = Wall((x_wall + 50), y_wall)
wall3 = Wall((x_wall + 100), y_wall)
wall4 = Wall((x_wall + 150), y_wall)
wall5 = Wall((x_wall + 200), y_wall)
wall6 = Wall((x_wall + 250), y_wall)
#add all the walls to the list to draw them later
wall_list.add(wall, wall2, wall3, wall4, wall5, wall6)
#add all the walls here to fix the collision
all_walls = (wall, wall2, wall3, wall4, wall5, wall6)
while not done:
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
sprites.update()
wall_list.update()
enemys.update()
#collision between player and and walls
if player.rect.collidelist(all_walls) >= 0:
print("Collision !!")
player.rect.x = player.rect.x - player.vx
player.rect.y = player.rect.y - player.vx
#fill the screen
screen.fill((0, 0, 0))
#screen.blit(background,(x,y))
#draw the sprites
sprites.draw(screen)
wall_list.draw(screen)
enemys.draw(screen)
pygame.display.flip()
clock.tick(60)
pygame.quit()
Here is the download link with the images if you want to run it:
https://geordyd.stackstorage.com/s/hZZ1RWcjal6ecZM

I'd give the sprite a list of points (self.waypoints) and assign the first one to a self.target attribute.
In the update method I subtract the self.pos from the self.target position to get a vector (heading) that points to the target and has a length equal to the distance. Scale this vector to the desired speed and use it as the velocity (which gets added to the self.pos vector each frame) and the entity will move towards the target.
When the target is reached, I just increment the waypoint index and assign the next waypoint in the list to self.target. It's a good idea to slow down when you're getting near the target, otherwise the sprite could get stuck and moves back and forth if it can't reach the target point exactly. Therefore I also check if the sprite is closer than the self.target_radius and decrease the velocity to a fraction of the maximum speed.
import pygame as pg
from pygame.math import Vector2
class Entity(pg.sprite.Sprite):
def __init__(self, pos, waypoints):
super().__init__()
self.image = pg.Surface((30, 50))
self.image.fill(pg.Color('dodgerblue1'))
self.rect = self.image.get_rect(center=pos)
self.vel = Vector2(0, 0)
self.max_speed = 3
self.pos = Vector2(pos)
self.waypoints = waypoints
self.waypoint_index = 0
self.target = self.waypoints[self.waypoint_index]
self.target_radius = 50
def update(self):
# A vector pointing from self to the target.
heading = self.target - self.pos
distance = heading.length() # Distance to the target.
heading.normalize_ip()
if distance <= 2: # We're closer than 2 pixels.
# Increment the waypoint index to swtich the target.
# The modulo sets the index back to 0 if it's equal to the length.
self.waypoint_index = (self.waypoint_index + 1) % len(self.waypoints)
self.target = self.waypoints[self.waypoint_index]
if distance <= self.target_radius:
# If we're approaching the target, we slow down.
self.vel = heading * (distance / self.target_radius * self.max_speed)
else: # Otherwise move with max_speed.
self.vel = heading * self.max_speed
self.pos += self.vel
self.rect.center = self.pos
def main():
screen = pg.display.set_mode((640, 480))
clock = pg.time.Clock()
waypoints = [(200, 100), (500, 400), (100, 300)]
all_sprites = pg.sprite.Group(Entity((100, 300), waypoints))
done = False
while not done:
for event in pg.event.get():
if event.type == pg.QUIT:
done = True
all_sprites.update()
screen.fill((30, 30, 30))
all_sprites.draw(screen)
for point in waypoints:
pg.draw.rect(screen, (90, 200, 40), (point, (4, 4)))
pg.display.flip()
clock.tick(60)
if __name__ == '__main__':
pg.init()
main()
pg.quit()
Instead of the waypoints list and index I'd actually prefer to use itertools.cycle and just call next to switch to the next point:
# In the `__init__` method.
self.waypoints = itertools.cycle(waypoints)
self.target = next(self.waypoints)
# In the `update` method.
if distance <= 2:
self.target = next(self.waypoints)

Use a list to have him walk back and forth.
class Enemy(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.image.load("enemy.png")
self.image = pygame.transform.scale(self.image, (int(50), int(50)))
self.rect = self.image.get_rect()
self.rect.x = width / 3
self.rect.y = height / 3
#x or y coordinates
self.list=[1,2,3,4,5]
self.index=0
def update(self):
# patrol up and down or left and right depending on x or y
if self.index==4:
#reverse order of list
self.list.reverse()
self.index=0
#set the x position of the enemy according to the list
self.rect.x=self.list[self.index]
self.index+=1