python - Pygame lines disappear after rotating points -

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i new python , tried make game ship rotates. however, after rotating, ship disappears. printed coordinates of 3 points, , should appear on screen. know what's wrong code?

this code rotating ship:

radius = self.width / 2 self.angle += da center = [self.pos[0] + radius, self.pos[1] + radius]  point in self.points:     dx = int(math.cos(self.angle) * radius)     dy = int(math.sin(self.angle) * radius)     point[0] = center[0] + dx     point[1] = center[1] + dy

this code drawing screen:

while true:     event in pygame.event.get():         if event.type == pygame.quit:             pygame.quit()             sys.exit()      keys = pygame.key.get_pressed()     if keys[pygame.k_up]:         self.ship.move(self)     if keys[pygame.k_right]:         self.ship.rotate(0.08)     if keys[pygame.k_left]:         self.ship.rotate(-0.08)      self.display.fill(self.bgcolor)     self.ship.draw(self.display)      pygame.display.update()     self.fpsclock.tick(self.fps)

look @ code:

for point in self.points:     dx = int(math.cos(self.angle) * radius)     dy = int(math.sin(self.angle) * radius)     point[0] = center[0] + dx     point[1] = center[1] + dy

note you're not using point anything, setting it. assuming self.points list of points make ship, think ship collapsing single point whenever hits code.


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