Session 7: Cheatsheet

class Bug:
    def __init__(self, x, y):
        self.x = x
        self.y = y
        self.alive = True

    def update(self):
        self.y += 2

    def draw(self, screen):
        pygame.draw.circle(screen, GREEN, (int(self.x), int(self.y)), 15)

mijn_bug = Bug(200, 0)   # create
mijn_bug.update()         # call a method
mijn_bug.draw(screen)

class SlingerBug(Bug):
    def __init__(self, x, y):
        super().__init__(x, y)   # calls Bug.__init__
        self.timer = 0

    def update(self):            # overrides Bug.update
        self.timer += 0.05
        self.x = self.start_x + math.sin(self.timer) * 60
        self.y += 1.5

import math
self.x = start_x + math.sin(timer) * amplitude
# increase the timer every frame: timer += 0.05

bullets = []
# Create:
bullets.append(pygame.Rect(x - 3, y - 20, 6, 12))
# Move:
for b in bullets[:]:
    b.y -= 10
    if b.y < 0:
        bullets.remove(b)

bug_rect = pygame.Rect(bug.x - 15, bug.y - 15, 30, 30)
for bullet in bullets[:]:
    if bullet.colliderect(bug_rect):
        bug.alive = False
        bullets.remove(bullet)
        score += 1
        break

SPAWN = pygame.USEREVENT + 1
pygame.time.set_timer(SPAWN, 1500)  # every 1.5 seconds

for event in pygame.event.get():
    if event.type == SPAWN:
        bugs.append(Bug(random.randint(30, WIDTH - 30), -20))