python - How can i make the ship shoot bullets properly? -
i creating ship game can shoot down enemies , upgrade ship. have not done because have problem bullets.
before started point out using python 2.7 , pygame 1.9. aware there later versions of pygame , python started writing before knew there later versions of pygame python 3.4.
i point out basic coder , not know of advanced things yet.
import pygame import time pygame.init() white = (255,255,255) black = (0,0,0) red = (255,0,0) green = (0,255,0) blue = (0,0,255) display_width = 800 display_height = 600 gamedisplay = pygame.display.set_mode((display_width,display_height)) pygame.display.set_caption('destroyer') clock = pygame.time.clock() fps = 60 font = pygame.font.sysfont(none, 25) shipw = 69 shiph = 88 #~~~~~~~~~~~~~~~~~~~other functions~~~~~~~~~~~~~~~~~# #~~~~~~~~~~~~~~~~~~~~~~the game~~~~~~~~~~~~~~~~~~~~~# def game_loop(): shipimg = pygame.image.load('ship1.png') face = 1 #the direction ship facing. #1 = north, 2 = east, 3 = south, 4 = west x = (display_width * 0.45 )#location of ship - x axis y = (display_height * 0.45) #location of ship - y axis x_change = 0 #change in location of ship - x axis y_change = 0 #change in locations of ship - y axis #start of bullets #1 lgun = x + 9 #location of left gun rgun = x + 59 #location of right gun ybul = 0 #change in location of bullet - y axis xbul = 0 #change in loaction of bullet - x axis fire = 0 #this record direction of ship when bullet fired #end of bullets ybul_change = 0 xbul_change = 0 gameexit = false while not gameexit: event in pygame.event.get(): if event.type == pygame.quit: pygame.quit() quit() if event.type == pygame.keydown: if event.key == pygame.k_left: #the next 4 lines rotating ship left shipimg = pygame.transform.rotate(shipimg,90) face -= 1 face = (face - 1) % 4 face += 1 elif event.key == pygame.k_right: #the next 4 lines rotating ship right shipimg = pygame.transform.rotate(shipimg,-90) face -= 1 face = (face + 1) % 4 face += 1 elif event.key == pygame.k_up: if face == 1: y_change = -5 x_change = 0 elif face == 2: x_change = 5 y_change = 0 elif face == 3: y_change = 5 x_change = 0 elif face == 4: x_change = -5 y_change = 0 elif event.key == pygame.k_down: if face == 1: y_change = 5 x_change = 0 elif face == 2: x_change = -5 y_change = 0 elif face == 3: y_change = -5 x_change = 0 elif face == 4: x_change = 5 y_change = 0 elif event.key == pygame.k_s: y_change = 0 x_change = 0 elif event.key == pygame.k_pageup: if face == 1: x_change = -5 y_change = 0 elif face == 2: y_change = -5 x_change = 0 elif face == 3: x_change = 5 y_change = 0 elif face == 4: y_change = 5 x_change = 0 elif event.key == pygame.k_pagedown: if face == 1: x_change = 5 y_change = 0 elif face == 2: y_change = 5 x_change = 0 elif face == 3: x_change = -5 y_change = 0 elif face == 4: y_change = -5 x_change = 0 elif event.key == pygame.k_f: fire = face #record direction of fire if fire == 1 or fire == 3: #if facing north or south xbul_change = 0 #no movement - x axis xbul = 0 #not facing east or west, location 0 lgun = x + 9 #location of left gun - x axis rgun = x + 59 #location of right gun - x axis if fire == 1: #if facing north ybul_change = -5 #bullets go ybul = y - 10 #location of bullet when firing else: ybul_change = 5 #bullets go down ybul = y + 88 #location of bullet when firing - y axis else: #facing east or west ybul_change = 0 #no movement - y axis ybul = 0 #not facing north or south,location 0 lgun = y + 59 #location of left gun - y axis rgun = y + 9 #location of right gun - y axis if fire == 2: #if facing west xbul_change = 5 #bullets supposed move right move down xbul = x + 88 #location of bullets, don't know wrong doesn't work else: xbul_change = -5 #bullets supposed move left move xbul = x - 10 #location of bullets, don't know wrong doesn't work gamedisplay.fill(green) gamedisplay.blit(shipimg,(x,y)) if fire == 1 or fire == 3: #if facing north or south pygame.draw.rect(gamedisplay, red, [lgun, ybul, 2, 10]) pygame.draw.rect(gamedisplay, red, [rgun, ybul, 2, 10]) elif fire == 2 or fire == 4: #if facing east or west pygame.draw.rect(gamedisplay, blue, [lgun, xbul, 10, 2]) #the bullets not drawing in correct position , don't know why pygame.draw.rect(gamedisplay, blue, [rgun, xbul, 10, 2]) #the bullets not drawing in correct position , don't know why ybul += ybul_change #add change in location of bullet current location - y axis xbul += xbul_change #add change in location of bullet current location - x axis y += y_change #add change in location of ship current location - y axis x += x_change #add change in location of ship current location - x axis pygame.display.update() clock.tick(fps) game_loop() pygame.quit() quit() the ship shoot bullets correctly both guns when facing or facing down, however, when facing left or facing right, bullets still next 1 instead of on top of 1 guns , move or down instead of left or right.
here link ship: http://tinypic.com/r/2zszjv4/8
in case other link doesn't work: http://i61.tinypic.com/2zszjv4.jpg
i don't know wrong code, rewrote code twice couldn't figure out problem, please help.
the problem in following section. exchange xbul's , lgun's position , fine
elif fire == 2 or fire == 4: #if facing east or west pygame.draw.rect(gamedisplay, blue, [ xbul,lgun, 10, 2]) #the bullets not drawing in correct position , don't know why pygame.draw.rect(gamedisplay, blue, [ xbul,rgun, 10, 2]) #the bullets not drawing in correct position , don't know why 
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