Hi, I managed to roughly rotate the laser around the center of the end boss.
I created the laser at a starting position and then rotated it by the angle alpha around the center of the end boss.
I also had to rotate the laser image itself by the angle alpha.
Unfortunately, I haven't managed to properly apply deanhystad's solution to my game yet - I'm very sorry...
So I experimented with the code I posted below.
I changed the endboss gun from a double turret into a single gun, which extension line runs through the endboss's center.
I thought it would lead to easier calculations.
Now the endboss can shoot...
When the player is right downward the endboss's center, the laser comes out of the gun correctely (picture1).
In picture2 you can see that there is an offset.
I will be very thankful for hints how this can be fixed!!
Thanks a lot in advance!!
I created the laser at a starting position and then rotated it by the angle alpha around the center of the end boss.
I also had to rotate the laser image itself by the angle alpha.
Unfortunately, I haven't managed to properly apply deanhystad's solution to my game yet - I'm very sorry...
So I experimented with the code I posted below.
I changed the endboss gun from a double turret into a single gun, which extension line runs through the endboss's center.
I thought it would lead to easier calculations.
Now the endboss can shoot...
When the player is right downward the endboss's center, the laser comes out of the gun correctely (picture1).
In picture2 you can see that there is an offset.
I will be very thankful for hints how this can be fixed!!
Thanks a lot in advance!!
import pygame
from math import radians, sin, cos
import math
from pygame import Vector2
pygame.init()
screen_width = 800
screen_height = 600
fps = 60
end_boss_cooldown = 3000 # bullet cooldown in milliseconds
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption("End Boss Example")
ship_image_path = "ship_4.png"
gun_image_path = "singleGun.png"
laser_image_path = "endboss_laser2.png"
class EndBossGun(pygame.sprite.Sprite):
def __init__(self, x, y, angle):
super().__init__()
self.x = x
self.y = y
self.angle = angle
self.image = pygame.image.load(gun_image_path)
self.gun_image = self.image.copy()
self.rect = self.gun_image.get_rect()
self.rect.center = (x, y)
self.last_shot = pygame.time.get_ticks()
def aim(self, p):
# Rotate end_boss' gun
x_dist = p[0] - self.x
y_dist = self.y - (screen_height - 100)
self.angle = math.degrees(math.atan2(y_dist, x_dist)) + 90
self.image = pygame.transform.rotate(self.gun_image, self.angle)
self.rect = self.image.get_rect(center=(self.x, self.y))
return self.angle
# Create EndBoss class
class EndBoss(pygame.sprite.Sprite):
def __init__(self, x, y, health):
super().__init__()
self.x = x
self.y = y
self.health_start = health
self.health_remaining = health
self.image = pygame.image.load(ship_image_path)
self.rect = self.image.get_rect()
self.rect.center = (x, y)
# Initialize objects
end_boss_centerx = screen_width / 2
end_boss_centery = 195
end_boss_center = end_boss_centerx, end_boss_centery
end_boss = EndBoss(end_boss_centerx, end_boss_centery, 300)
end_boss_group = pygame.sprite.Group()
end_boss_group.add(end_boss)
end_boss_gun = EndBossGun(end_boss_centerx, end_boss_centery, 0)
end_boss_gun_group = pygame.sprite.Group()
end_boss_gun_group.add(end_boss_gun)
end_boss_gun_length = 100
end_boss_laser_start_pos = end_boss_centerx, end_boss_centery + end_boss_gun_length
end_boss_laser_group = pygame.sprite.Group()
# Create EndBossLaser class
class EndBossLaser(pygame.sprite.Sprite):
def __init__(self, x, y, angle):
pygame.sprite.Sprite.__init__(self)
self.x = x
self.y = y
self.angle = angle
self.image = pygame.image.load(laser_image_path)
self.clean_image = self.image.copy()
self.rect = self.image.get_rect()
# laser starts at the gun's end
self.rect.center = end_boss_gun.rect.midbottom
def rotate_laser_around_endboss_center(self, point, angle, pivot_point=(end_boss_centerx, end_boss_centery)):
# justify laser in the same angle of the gun
angle_radians = angle / 180 * math.pi
x, y = point
offset_x, offset_y = pivot_point
adjusted_x = (x - offset_x)
adjusted_y = (y - offset_y)
cos_rad = math.cos(angle_radians)
sin_rad = math.sin(angle_radians)
qx = offset_x + cos_rad * adjusted_x + sin_rad * adjusted_y
qy = offset_y + -sin_rad * adjusted_x + cos_rad * adjusted_y
self.rect.center = qx, qy
self.image = pygame.transform.rotate(self.clean_image, angle)
def update(self):
self.x += math.cos((-self.angle + 90) / 180 * math.pi)
self.y += math.sin((-self.angle + 90) / 180 * math.pi)
self.rect.center = self.x, self.y
def draw_bg():
screen.fill((0, 0, 0))
# Dummy spaceship class for testing
class Spaceship(pygame.sprite.Sprite):
def __init__(self):
super().__init__()
self.image = pygame.Surface((50, 50))
self.image.fill((255, 255, 255))
self.rect = self.image.get_rect()
self.rect.center = (screen_width // 2, screen_height - 50)
def update(self):
pass
def move(self, x):
self.rect.centerx = x
spaceship = Spaceship()
spaceship_group = pygame.sprite.Group()
spaceship_group.add(spaceship)
single_bullet_group = pygame.sprite.Group()
explosion_group = pygame.sprite.Group()
font40 = pygame.font.Font(None, 40)
def draw_text(text, font, color, x, y):
img = font.render(text, True, color)
screen.blit(img, (x, y))
def play_end_boss_level():
game_over = 0
last_count = pygame.time.get_ticks()
last_end_boss_shot = pygame.time.get_ticks()
countdown = 3
run = True
while run:
p = pygame.mouse.get_pos()
clock.tick(fps)
draw_bg()
if countdown == 0:
angle = end_boss_gun.aim(p)
time_now = pygame.time.get_ticks()
if time_now - last_end_boss_shot > end_boss_cooldown and len(end_boss_group) > 0:
# start position laser
end_boss_laser = EndBossLaser(end_boss_centerx, end_boss_centery + end_boss_gun_length, angle)
end_boss_laser_group.add(end_boss_laser)
end_boss_laser.rotate_laser_around_endboss_center(end_boss_laser_start_pos, angle)
last_end_boss_shot = time_now
if len(end_boss_group) == 0:
game_over = 1
if game_over == 0:
spaceship.update()
single_bullet_group.update()
end_boss_group.update()
end_boss_gun_group.update()
explosion_group.update()
end_boss_laser_group.update()
else:
if game_over == -1:
draw_text('GAME OVER!', font40, (255, 255, 255), int(screen_width / 2 - 100),
int(screen_height / 2 + 50))
if game_over == 1:
draw_text('YOU WIN!', font40, (255, 255, 255), int(screen_width / 2 - 100),
int(screen_height / 2 + 50))
if countdown > 0:
draw_text('GET READY!', font40, (255, 255, 255), int(screen_width / 2 - 110), int(screen_height / 2 + 50))
draw_text(str(countdown), font40, (255, 255, 255), int(screen_width / 2 - 10), int(screen_height / 2 + 100))
count_timer = pygame.time.get_ticks()
if count_timer - last_count > 1000:
countdown -= 1
last_count = count_timer
spaceship_group.draw(screen)
single_bullet_group.draw(screen)
explosion_group.draw(screen)
end_boss_group.draw(screen)
end_boss_gun_group.draw(screen)
end_boss_laser_group.draw(screen)
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
spaceship.move(p[0])
pygame.display.flip()
pygame.quit()
clock = pygame.time.Clock()
if __name__ == "__main__":
play_end_boss_level()
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