We Keep Coding

How to detect touch screen clicks in python?

How can I detect if an image has been touched in pygame on a touch screen? I have searched but I can not find how to detect if a particular image is touched.

To detect if an image has been touched, you can use the MOUSEBUTTONDOWN event. See Pygame mouse clicking detection.
Load the image with pygame.image.load(). Crate the bounding rectangle (pygame.Rect). Create a pygame.Mask from the image with pygame.mask.from_surface:
image = pygame.image.load('image.png').convert_alpha()
image _rect = image.get_rect(topleft = (x, y))
image_mask = pygame.mask.from_surface(image)
Use the MOUSEBUTTONDOWN event to detect if the mouse is clicked in the rectangular area of the image. Check if the corresponding bit in the image mask is set:
for event in pygame.event.get():
if event.type == pygame.MOUSEBUTTONDOWN:
image_x, image_y = event.pos[0] - image_rect.x, event.pos[1] - image_rect.y
if image_rect.collidepoint(event.pos) and image_mask.get_at((image_x, image_y)):
print("touched")
Minimal example:
import pygame
pygame.init()
window = pygame.display.set_mode((400, 400))
font = pygame.font.SysFont(None, 100)
clock = pygame.time.Clock()
text = font.render("Text", True, (255, 255, 0))
bomb = pygame.image.load('Bomb-256.png').convert_alpha()
bomb_rect = bomb.get_rect(center = window.get_rect().center)
bomb_mask = pygame.mask.from_surface(bomb)
click_count = 0
click_text = font.render('touch: ' + str(click_count), True, "black")
run = True
while run:
clock.tick(60)
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
if event.type == pygame.MOUSEBUTTONDOWN:
image_x, image_y = event.pos[0] - bomb_rect.x, event.pos[1] - bomb_rect.y
if bomb_rect.collidepoint(event.pos) and bomb_mask.get_at((image_x, image_y)):
click_count += 1
click_text = font.render('touch: ' + str(click_count), True, "black")
window.fill((255, 255, 255))
window.blit(bomb, bomb_rect)
window.blit(click_text, click_text.get_rect(topleft = (20, 20)))
pygame.display.flip()
pygame.quit()
exit()

If I run this from the raspberry pi desktop the touch is not detected.
But if I execute this from ssh remote it works fine

How do you run a function when you click on an image in pygame?

How would you run a function when you click on an image in pygame? In my program, I want to run a specific function when you click on a certain image. The problem is, I have no idea how to do that. Is it even possible to do that? Here is my code below...
import pygame
black = (0, 0, 0)
white = (255, 255, 255)
green = (0, 255, 0)
red = (255, 0, 0)
pygame.init()
size = (500, 400)
screen = pygame.display.set_mode(size)
pygame.draw.rect(screen, red,(150,450,100,50))
button1 = pygame.Rect(100,100,50,50)
button2 = pygame.Rect(200,200,50,50)
button3 = pygame.Rect(130,250,50,50)
pygame.display.set_caption("Yami no Game")
txt = pygame.image.load('txt.png')
Stxt = pygame.transform.scale(txt,(48,48))
exe = pygame.image.load('exe.jpg')
Sexe = pygame.transform.scale(exe,(48,48))
done = False
clock = pygame.time.Clock()
background_image=pygame.image.load('windows_background.jpg').convert()
while not done:
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
if event.type == pygame.MOUSEBUTTONDOWN:
100, 100 = event.pos
if Sexe.get_rect().collidepoint(100,100):
print('Runnig thing')
screen.blit(background_image, [0,0])
screen.blit(Stxt,[100,100])
screen.blit(Sexe,[250,250])
pygame.display.update()
clock.tick(60)
pygame.quit()

Detect for a mouseclick then check the position of the mouse when the click occurred and see whether it was within the image by using the collidepoint function:
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
if event.type == pygame.MOUSEBUTTONDOWN:
mousePos = pygame.mouse.get_pos()
if Sexe.get_rect().collidepoint(mousePos):
runFunction()

In general you speak of using a button to execute something. For this we need to know where the player clicked with the mouse, test if it is inside the area that depicts the image (our "button") and if so, execute a function. Here is a small example:
# get the mouse clicks
mouse = pygame.mouse.get_pos() # position
click = pygame.mouse.get_pressed() # left/right click
if img.x + img.width > mouse[0] > img.x and img.y + img.height > mouse[1] > img.y: # Mouse coordinates checking.
if click[0] == 1: # Left click
my_function_on_click()
It requires your image object to have an x and a y coordinate as well as a defined height and width. It is a lot easier if your image object has a rect the same size as you can call on that rect, or as the other answer pointed out use the collidepoint function.
Minimal example using the code you copied into the comments:
width = 48
height = 48
x = 100
y = 100
exe = pygame.image.load('exe.jpg')
Sexe = pygame.transform.scale(exe,(width,height))
while not done:
screen.blit(Sexe,[x,y]) # blit image
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
mouse = pygame.mouse.get_pos()
position click = pygame.mouse.get_pressed() # left/right click
# Mouse coordinates checking:
sexe_rect = Sexe.get_rect()
if sexe_rect.x + sexe_rect.width > mouse[0] > sexe_rect.x and sexe_rect.y + sexe_rect.height > mouse[1] > sexe_rect.y:
# if Sexe.get_rect().collidepoint(mousePos): # Alternative, A LOT shorter and more understandable
if click[0] == 1: # Left click
print("I GOT CLICKED!")

Transparent background not disappearing when displayed on pygame window

I am creating a car game and have come across a problem. I've added a car image with a transparent background into my code but the car appears on the screen with the transparent background visible. I want to make the background to disappear. This is a link to the image: https://www.pngfind.com/mpng/bboJib_car-top-view-png-audi-transparent-png/
Here is the code:
import pygame
pygame.init()
import pygame
pygame.init()
black = (0, 0, 0)
#screen
screen_width = 600
screen_length = 800
screen = pygame.display.set_mode((screen_length, screen_width))
clock = pygame.time.Clock()
FPS = 60
#the car i am having trouble with
car2Img = pygame.image.load('car2.png')
car2_X = 0
car2_Y = 0
carX_change = 0
def car2(x, y):
screen.blit(car2Img, (x, y))
running = True
while running:
screen.fill((119, 118, 110))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
car2(car2_X, car2_Y)
clock.tick(FPS)
pygame.display.update()
pygame.quit()

In order to remove the background from a png image you must use the convert_alpha() function when loading it:
car2Img = pygame.image.load('car2.png').convert_alpha()
If your image doesn't contain alpha then you can use a color key to remove the background:
car2Img.set_colorkey(colorOfBackground)

Pygame blit image with mouse event

I use Pygame in this code. This is like a game that when user hit mouse button, from the mouse position comes a laser image that will go up, and eventually go out of the screen. I am trying to blit an image when the user hit mouse button. This code I am using does not work and I do not know why. My problem starts at the main for loop
import pygame
# Initialize Pygame
pygame.init()
#___GLOBAL CONSTANTS___
# Define some colors
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)
RED = (255, 0, 0)
# Set the height and width of the screen
screen_width = 500
screen_height = 500
screen = pygame.display.set_mode([screen_width, screen_height])
#Load Laser image of spaceship
laser_image = pygame.image.load('laserRed16.png').convert()
#Load sound music
sound = pygame.mixer.Sound('laser5.ogg')
# Loop until the user clicks the close button.
done = False
# Used to manage how fast the screen updates
clock = pygame.time.Clock()
# -------- Main Program Loop -----------
while not done:
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
elif event.type == pygame.MOUSEBUTTONDOWN:
# Get the current mouse position. This returns the position
# as a list of two numbers.
sound.play()
#Get the mouse position
mouse_position = pygame.mouse.get_pos()
mouse_x = mouse_position[0]
mouse_y = mouse_position[1]
# Set the laser image when the spaceship fires
for i in range(50):
screen.blit(laser_image,[mouse_x + laser_x_vector,mouse_y + laser_x_vector])
laser_x_vector += 2
laser_x_vector += 2
# Clear the screen
screen.fill(WHITE)
#Limit to 20 sec
clock.tick(20)
# Go ahead and update the screen with what we've drawn.
pygame.display.flip()
pygame.quit()

You fill the screen after you blit the lazer, so the lazer will not appear. You should fill before you blit the lazer so the lazer appears.

The others have already explained why you don't see the laser. Here's a working solution for you. First I suggest to use pygame.Rects for the positions of the lasers and put them into a list (rects can also be used for collision detection). Then iterate over these positions/rects in the main while loop, update and blit them. I also show you how to remove rects that are off screen.
import pygame
pygame.init()
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)
screen_width = 500
screen_height = 500
screen = pygame.display.set_mode([screen_width, screen_height])
laser_image = pygame.Surface((10, 50))
laser_image.fill(GREEN)
done = False
clock = pygame.time.Clock()
laser_rects = []
laser_velocity_y = -20
while not done:
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
elif event.type == pygame.MOUSEBUTTONDOWN:
# Turn the mouse position into a rect with the dimensions
# of the laser_image. You can use the event.pos instead
# of pygame.mouse.get_pos() and pass it as the `center`
# or `topleft` argument.
laser_rect = laser_image.get_rect(center=event.pos)
laser_rects.append(laser_rect)
remaining_lasers = []
for laser_rect in laser_rects:
# Change the y-position of the laser.
laser_rect.y += laser_velocity_y
# Only keep the laser_rects that are on the screen.
if laser_rect.y > 0:
remaining_lasers.append(laser_rect)
# Assign the remaining lasers to the laser list.
laser_rects = remaining_lasers
screen.fill(WHITE)
# Now iterate over the lasers rect and blit them.
for laser_rect in laser_rects:
screen.blit(laser_image, laser_rect)
pygame.display.flip()
clock.tick(30) # 30 FPS is smoother.
pygame.quit()

How do I check to see if a mouse click is within a circle in pygame?

import pygame
pygame.init()
white = 255,255,255
cyan = 0,255,255
gameDisplay = pygame.display.set_mode((800,600))
pygame.display.set_caption('Circle Click Test')
stop = False
while not stop:
gameDisplay.fill(white)
pygame.draw.circle(gameDisplay,cyan,(400,300),(100))
for event in pygame.event.get():
if event.type == pygame.MOUSEBUTTONDOWN:
####################################################
if event.type == pygame.QUIT:
pygame.quit()
sys.exit()
pygame.display.update()
Here I have a circle on the screen, and I would like to check to see if the user
clicked within the circle. I know how to do this with a rectangle, I would assume it would be similar. Thanks for any help, I am quite new to pygame.
here is what I have for rectangles:
import pygame
pygame.init()
white = 255,255,255
cyan = 0,255,255
gameDisplay = pygame.display.set_mode((800,600))
pygame.display.set_caption('Circle Click Test')
rectangle = pygame.Rect(400,300,200,200)
stop = False
while not stop:
gameDisplay.fill(white)
pygame.draw.rect(gameDisplay, cyan,rectangle,4)
for event in pygame.event.get():
if event.type == pygame.MOUSEBUTTONDOWN:
click = rectangle.collidepoint(pygame.mouse.get_pos())
if click == 1:
print 'CLICKED!'
if event.type == pygame.QUIT:
pygame.quit()
sys.exit()
pygame.display.update()

Use the distance formula:
################################################################################
# Imports ######################################################################
################################################################################
from pygame.locals import *
import pygame, sys, math
################################################################################
# Screen Setup #################################################################
################################################################################
pygame.init()
scr = pygame.display.set_mode((640, 480))
pygame.display.set_caption('Box Test')
################################################################################
# Game Loop ####################################################################
################################################################################
while True:
pygame.display.update(); scr.fill((200, 200, 255))
pygame.draw.circle(scr, (0, 0, 0), (400, 300), 100)
x = pygame.mouse.get_pos()[0]
y = pygame.mouse.get_pos()[1]
sqx = (x - 400)**2
sqy = (y - 300)**2
if math.sqrt(sqx + sqy) < 100:
print 'inside'
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
sys.exit()
################################################################################
################################################################################
################################################################################

you could sample the pixel like this
detect click on shape pygame
otherwise use pythagoras to get the distance from the centre.
As Malik shows, pythagoras works well for circles, but for general solid colour shapes you can do:
if event.type == pygame.MOUSEBUTTONDOWN:
click = gameDisplay.get_at(pygame.mouse.get_pos()) == cyan
if click == 1:
print 'CLICKED!'