CREATING A REACTION TIME TEST GAME IN PYGAME
I am trying to create a reaction time test game in python using pygame for gui. Since, I am fairly new to the technology, I am stuck at a portion of the code as how to register further keypresses and then record time accordingly.
This is my code till now:
import pygame
from datetime import datetime
import time
import random
pygame.init()
screen = pygame.display.set_mode((640, 480))
pygame.display.set_caption("Reaction Time Test")
font = pygame.font.SysFont(None, 30)
text = font.render("PRESS ANY KEY TO START TEST", 0, (255,255,255))
w = font.render("PRESS ANY KEY",0,(0,255,0))
count = 0
screen.blit(text, (150,240))
running = True
while running:
pygame.display.flip()
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
pygame.quit()
if count <= 5 and event.type == pygame.KEYDOWN:
screen.fill(pygame.Color("black"))
pygame.display.flip()
wait_time = random.randint(1,4)
time.sleep(wait_time)
reaction_start = datetime.now()
print(reaction_start)
screen.blit(w,(225,200))
count = count + 1
if event.type == pygame.KEYDOWN:
reaction_end = datetime.now()
print(reaction_end)
t = reaction_end - reaction_start
print(t)
f = font.render("REACTION TIME: "+ str(t),0,(255,255,255))
screen.blit(f,(225,300))
if count > 5:
screen.fill(pygame.Color("black"))
pygame.display.flip()
s = font.render("AVERAGE REACTION TIME IS: ",0,(255,255,255))
screen.blit(s,(150,200))
pygame.display.flip()
The part where I am stuck at it is this code snippet
if count <= 5 and event.type == pygame.KEYDOWN:
screen.fill(pygame.Color("black"))
pygame.display.flip()
wait_time = random.randint(1,4)
time.sleep(wait_time)
reaction_start = datetime.now()
print(reaction_start)
screen.blit(w,(225,200))
count = count + 1
if event.type == pygame.KEYDOWN:
reaction_end = datetime.now()
print(reaction_end)
t = reaction_end - reaction_start
print(t)
f = font.render("REACTION TIME: "+ str(t),0,(255,255,255))
screen.blit(f,(225,300))
It would register the reaction_start and reaction_end almost simulataneously and would not wait for the key press.
This currently prints both the statements "PRESS ANY KEY" and "REACTION TIME:" together, but when I had put the statements of screen.fill(pygame.Color("black") and pygame.display.flip() before the screen.blit(f), it would only show REACTION TIME: and not "PRESS ANY KEY"
Solution
In pygame the system time can be obtained by calling pygame.time.get_ticks(), which returns the number of milliseconds since pygame.init() was called.
Do not try to delay or to wait in the application loop. Add a game_state variabel, that which can have the states "start", "wait" and "wait_for_reaction".
Get the current time at the begin of the application loop:
while running:
current_time = pygame.time.get_ticks()
Set the start time when a key is pressed:
if event.type == pygame.KEYDOWN:
if game_state == "start":
game_state = "wait"
start_time = current_time + random.randint(1000, 4000)
Chang the game_state form "wait" to "wait_for_reaction" when the current time is greater or equal the start time:
if game_state == "wait":
if current_time >= start_time:
game_state = "wait_for_reaction"
Compute the reaction time and restart the process, when a key is hit again:
if event.type == pygame.KEYDOWN:
# [...]
if game_state == "wait_for_reaction":
game_state = "wait"
reaction_time = (current_time - start_time) / 1000
start_time = current_time + random.randint(1000, 4000)
count += 1
average_time = (average_time * (count-1) + reaction_time) / count
r_surf = font.render(f"REACTION TIME: {reaction_time:.03f}",0,(255,255,255))
ar_surf = font.render(f"AVERAGE REACTION TIME IS: {average_time:.03f}",0,(255,255,255))
Redraw the scene in every frame, dependent on the state of the game:
while running:
# [...]
screen.fill(pygame.Color("black"))
center = screen.get_rect().center
if game_state == "start":
screen.blit(text, text.get_rect(center = center))
if game_state == "wait_for_reaction":
screen.blit(w, w.get_rect(center = center))
if r_surf:
screen.blit(r_surf, r_surf.get_rect(center = (center[0], 350)))
if ar_surf:
screen.blit(ar_surf, ar_surf.get_rect(center = (center[0], 400)))
pygame.display.flip()
Complete example:
import pygame
import random
pygame.init()
screen = pygame.display.set_mode((640, 480))
pygame.display.set_caption("Reaction Time Test")
font = pygame.font.SysFont(None, 30)
text = font.render("PRESS ANY KEY TO START TEST", 0, (255,255,255))
w = font.render("PRESS ANY KEY",0,(0,255,0))
r_surf = None
ar_surf = None
game_state = "start"
start_time = 0
average_time = 0
count = 0
running = True
while running:
current_time = pygame.time.get_ticks()
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
pygame.quit()
if event.type == pygame.KEYDOWN:
if game_state == "start":
game_state = "wait"
start_time = current_time + random.randint(1000, 4000)
if game_state == "wait_for_reaction":
game_state = "wait"
reaction_time = (current_time - start_time) / 1000
start_time = current_time + random.randint(1000, 4000)
count += 1
average_time = (average_time * (count-1) + reaction_time) / count
r_surf = font.render(f"REACTION TIME: {reaction_time:.03f}",0,(255,255,255))
ar_surf = font.render(f"AVERAGE REACTION TIME IS: {average_time:.03f}",0,(255,255,255))
if game_state == "wait":
if current_time >= start_time:
game_state = "wait_for_reaction"
screen.fill(pygame.Color("black"))
center = screen.get_rect().center
if game_state == "start":
screen.blit(text, text.get_rect(center = center))
if game_state == "wait_for_reaction":
screen.blit(w, w.get_rect(center = center))
if r_surf:
screen.blit(r_surf, r_surf.get_rect(center = (center[0], 350)))
if ar_surf:
screen.blit(ar_surf, ar_surf.get_rect(center = (center[0], 400)))
pygame.display.flip()
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