I am trying to make a rectangle move up and down on the screen. But when I press the keys to make it go up or down I have to continuously press it each time to make it move. The way I interpreted pygame.KEYDOWN
was that I can hold down the desired key and the rectangle would move until I release the key.
Code for key pressed:
while True:
for event in pygame.event.get():
# all keys
keys = pygame.key.get_pressed()
# quit game
if event.type == pygame.QUIT or keys[pygame.K_ESCAPE]:
pygame.quit()
quit()
# check key down presses
elif event.type == pygame.KEYDOWN:
# left paddle
if keys[pygame.K_q]:
left.move(-30)
if keys[pygame.K_a]:
left.move(30)
# right paddle
if keys[pygame.K_p]:
right.move(-30)
if keys[pygame.K_l]:
right.move(30)
# user let up on a key
elif event.type == pygame.KEYUP:
if event.key == keys[pygame.K_q] or event.key == keys[pygame.K_a]:
left.move(0)
elif event.key == pygame.K_p or event.key == pygame.K_l:
right.move(0)
# call animation function
draw()
# FPS
clock.tick(120)
The left
and right
objects are coming from the following class:
import pygame
class Paddle:
def __init__(self, screen, h, w, left):
self.screen = screen
self.width = w
self.y = h / 2
self.pad_width = 10
self.pad_height = 70
if left:
self.x = self.pad_width / 2
else:
self.x = self.width - self.pad_width * 1.5
def show(self):
WHITE = (255, 255, 255)
rect = pygame.Rect(self.x, self.y, self.pad_width, self.pad_height)
pygame.draw.rect(self.screen, WHITE, rect)
def move(self, speed):
self.y += speed
Your game loop should comprise of three main steps:
I think by doing steps 1 and 2 together you may have confused yourself a bit.
Firstly, KEYDOWN
detects a key being pressed , rather than being down . Because of this I suggest keeping track of current key states, as a basic example:
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_q:
q_down = True
else:
if event.key == pygame.K_q:
q_down = False
Now user input is handled you can simply use:
if q_down: left.move(-30)
in your game loop to update the game state (note this should be outside your event loop).
I also suggest your read this post from game dev SE and have a look at the linked resources to better understand the game loop.
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