0

My bullet won't move towards the location I click on for example I click on the left side of the screen and it will move to the bottom left corner of the screen. I believe it has something to do with the angle at which the bullet is sent however I'm not sure.

import pygame
from pygame.locals import *
import time
import math
pygame.init()

Below I set up the bullet class holding the details about the bullet

class bullet:
    bullet_img = pygame.image.load("bullet png for game.png")
    bullet_img = pygame.transform.scale(bullet_img,(70,60))
    bullet_dx = 2
    bullet_dy = 2
    bullet_x = 450
    bullet_y = 450
    bullet_travelling = False

    

player_bullet = bullet

Setting up window

screen_width = 1000
screen_height = 1000

screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption("Shooting Prototype")



# functions

Gets the position of the mouse and returns it def get_cords(): mouse_x,mouse_y = pygame.mouse.get_pos() return mouse_x,mouse_y

Gets the distance between the current position of the bullet and the mouse position

def get_distance(mouse_x,mouse_y):
    x_distance = mouse_x - player_bullet.bullet_x
    y_distance = mouse_y - player_bullet.bullet_y
    
    
        
    print("distance",x_distance,y_distance)
    return x_distance,y_distance

Calculates the angle for the bullet to move

def calculate_angle(x_distance,y_distance):
    distance_over_distance = y_distance/x_distance
    angle = math.atan(distance_over_distance)
    print(angle)
    return angle

Finds the speeds for the bullet to move at

def calculate_dy_and_dx():
    player_bullet.bullet_dx = math.cos(angle)*5
    player_bullet.bullet_dx = math.sin(angle)*5
    player_bullet.bullet_travelling = True

moves the bullet if the bullet hits the borders the bullet stops

def move_bullet():
    if player_bullet.bullet_x <= 0 or player_bullet.bullet_x >= 1000 or player_bullet.bullet_y <= 0 or player_bullet.bullet_y >= 1000:
        player_bullet.bullet_travelling = False
        
    if player_bullet.bullet_x >= 0 or player_bullet.bullet_x <= 1000 or player_bullet.bullet_y >= 0 or player_bullet.bullet_y <= 1000:
        player_bullet.bullet_x += player_bullet.bullet_dx
        print("position x",player_bullet.bullet_x)
        player_bullet.bullet_y += player_bullet.bullet_dy
        print("position y",player_bullet.bullet_y)

background_img = pygame.image.load("industrial background.png")
run = True
# game loop
while run:
    screen.blit(background_img, (0,0))

    screen.blit(player_bullet.bullet_img, (player_bullet.bullet_x,player_bullet.bullet_y))
    
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
        if event.type == pygame.MOUSEBUTTONDOWN:
            if event.button == 1:
                mouse_x,mouse_y = get_cords()
                x_distance,y_distance = get_distance(mouse_x,mouse_y)
                angle = calculate_angle(x_distance,y_distance)
                calculate_dy_and_dx()
    if player_bullet.bullet_travelling == True:
        move_bullet()
       
        
        
    pygame.display.update()

pygame.quit()
The Imperiol
  • 1
  • I didn't run code but usually there are two problems. (1) functions need angles in `radians` instead of `degrees`. (2) at school (in math lessons ) we learn that `(0,0)` is at the left bottom corner and positive values are above `0`, and negative values are below `0` but in computer often you have `(0,0)` at left top corner and positive values are below `0` and negative values are above `0` - and this needs some changes in calculations – furas Jul 24 '22 at 13:06
  • for your second point for some reason my window has (0,0) at the top left of the screen. – The Imperiol Jul 25 '22 at 14:34

0 Answers0