there is a question in stackoverflow with the title: Make a line as a sprite with its own collision. Rabbid 76 answered this question with an example
My Question :
How must the example be changed so that when the line hits the image, a "hit" message appears, which disappears again after 1 seconds.
Then a second message comes up for 1 seconds when the line leaves the picture.
I suggest to use pygame.sprite.Group/pygame.sprite.Sprite.
Create a text sprite when an obstacle is hit. Add the time at which the text must disappear again as an attribute to the sprite.
In addition, the obstacle must be prevented from generating continuous "hit" texts in successive frames. When an obstacle is hit, it is marked by setting a Boolean attribute in the obstacle. As long as this attribute is set, the obstacle cannot generate a new "hit" text. When the objects no longer collide, the attribute is reset:
while run:
# [...]
current_time = pygame.time.get_ticks()
for obstacle in obstacles:
rel_hit_pos = pygame.sprite.collide_mask(ball, obstacle)
if rel_hit_pos:
if obstacle.hit == False:
obstacle.hit = True
hit_sprite = pygame.sprite.Sprite()
hit_sprite.image = hit_text_image
hit_pos = ball.rect.x + rel_hit_pos[0], ball.rect.y + rel_hit_pos[1]
hit_sprite.rect = hit_sprite.image.get_rect(center = hit_pos)
hit_sprite.end_time = current_time + pop_up_seconds * 1000
text_sprites.add(hit_sprite)
else:
obstacle.hit = False
kill the sprite when the current time is greater than the end time of the sprite:
while run:
# [...]
current_time = pygame.time.get_ticks()
for hit_sprite in text_sprites:
if current_time > hit_sprite.end_time:
hit_sprite.kill()
Minimal example:
import pygame, random
pygame.init()
window = pygame.display.set_mode((400, 400))
font = pygame.font.SysFont(None, 40)
clock = pygame.time.Clock()
bounds = pygame.Rect(20, 20, 360, 360)
hit_text_image = font.render("hit", True, "yellow")
text_pos_and_time = []
pop_up_seconds = 1
ball = pygame.sprite.Sprite()
ball.image = pygame.Surface((40, 40), pygame.SRCALPHA)
pygame.draw.circle(ball.image, "red", (20, 20), 20)
ball.rect = ball.image.get_rect(center = window.get_rect().center)
ball.pos = pygame.Vector2(ball.rect.center)
ball.dir = pygame.Vector2(random.uniform(0.5, 1), random.uniform(0.5, 1))
ball.dir.normalize_ip()
ball.speed = 0
obstacles = []
for pos in [(100, 200), (300, 100), (250, 300)]:
obstacle = pygame.sprite.Sprite()
obstacle.image = pygame.Surface((60, 60))
obstacle.image.fill("darkgreen")
obstacle.rect = obstacle.image.get_rect(center = pos)
obstacle.hit = False
obstacles.append(obstacle)
all_sprites = pygame.sprite.Group([ball, *obstacles])
text_sprites = pygame.sprite.Group()
text = font.render("+1", True, (0, 255, 0))
text_pos_and_time = []
pop_up_seconds = 1
player = pygame.Rect(0, 80, 40, 40)
coins = [pygame.Rect(i*100+100, 80, 40, 40) for i in range(3)]
run = True
while run:
clock.tick(60)
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
if event.type == pygame.KEYDOWN:
ball.dir = pygame.Vector2(random.uniform(0.5, 1), random.uniform(0.5, 1))
ball.dir.normalize_ip()
ball.speed = 5
keys = pygame.key.get_pressed()
player.x = (player.x + (keys[pygame.K_RIGHT] - keys[pygame.K_LEFT]) * 3) % 300
ball.pos += ball.dir * ball.speed
ball.rect.center = round(ball.pos.x), round(ball.pos.y)
if not bounds.contains(ball.rect.inflate(2, 2)):
if ball.rect.left <= bounds.left or ball.rect.right >= bounds.right:
ball.dir.x *= -1
if ball.rect.top <= bounds.top or ball.rect.bottom >= bounds.bottom:
ball.dir.y *= -1
ball.rect.clamp_ip(bounds)
ball.pos = pygame.Vector2(ball.rect.center)
current_time = pygame.time.get_ticks()
for obstacle in obstacles:
rel_hit_pos = pygame.sprite.collide_mask(ball, obstacle)
if rel_hit_pos:
if obstacle.hit == False:
obstacle.hit = True
hit_sprite = pygame.sprite.Sprite()
hit_sprite.image = hit_text_image
hit_pos = ball.rect.x + rel_hit_pos[0], ball.rect.y + rel_hit_pos[1]
hit_sprite.rect = hit_sprite.image.get_rect(center = hit_pos)
hit_sprite.end_time = current_time + pop_up_seconds * 1000
text_sprites.add(hit_sprite)
else:
obstacle.hit = False
for hit_sprite in text_sprites:
if current_time > hit_sprite.end_time:
hit_sprite.kill()
window.fill(0)
pygame.draw.rect(window, "gray", bounds, 3)
all_sprites.draw(window)
text_sprites.draw(window)
pygame.display.flip()
pygame.quit()
exit()
