Pygame,shooting bullets using vectors - vector

Question

Ok so all night me and 5 other guys have been working on a project for our pygame module.Our lecturer hasn't given us any programs to reference from he has just throw a bunch of code at us (without commenting) and expecting us to understand it.We only started python since the start of september.We really need some help.
So we have one human player which is controlled by W A S & D and 15 random dots moving around the screen.We need to use vectors(which we have never used) to shoot at the random dots.
Please someone help.
edit code added~
import pygame
class Terminator(pygame.sprite.Sprite):
def __init__(self, screen):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.Surface((20, 20))
self.image.fill((0, 0, 0))
pygame.draw.circle(self.image, (255, 0, 0), (10, 10), 10, 0)
self.rect = self.image.get_rect()
self.dx = screen.get_width()/2
self.dy = screen.get_height()/2
self.rect.center = (self.dx, self.dy)
self.speed = 5
self.screen = screen
def update(self):
self.rect.center = (self.dx, self.dy)
def MoveLeft(self):
if self.rect.left < 0:
self.dx += 0
else:
self.dx -= self.speed
def MoveRight(self):
if self.rect.right > self.screen.get_width():
self.dx += 0
else:
self.dx += self.speed
def MoveUp(self):
if self.rect.top <0:
self.dy += 0
else:
self.dy -= self.speed
def MoveDown(self):
if self.rect.bottom > self.screen.get_height():
self.dy += 0
else:
self.dy += self.speed
<code>
humansprite.py
<pre>
import pygame
import random
import math
class Humans(pygame.sprite.Sprite):
def __init__(self, screen):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.Surface((16, 16))
self.image.fill((0, 0, 0))
pygame.draw.circle(self.image, (0, 0, 255), (8, 8), 8, 0)
self.rect = self.image.get_rect()
self.dx = random.randrange(0, screen.get_height())
self.dy = random.randrange(0, screen.get_width())
self.screen = screen
self.speed = 1
self.alive = True
def update(self):
self.rect.centerx -= self.dx
self.rect.centery -= self.dy
if self.rect.right < 0:
self.reset()
def reset(self):
self.rect.left = self.screen.get_width()
self.rect.centery = random.randrange(0, self.screen.get_height())
self.dy = random.randrange(-2, 2)
self.dx = random.randrange(1, 4)
<code>
seekandDestory.py
<pre>
import pygame
from TerminatorSprite import Terminator
from humansSprite import Humans
pygame.init()
def checkKeys(myData):
(event, ship) = myData
if event.key == pygame.K_LEFT:
print 'LEFT'
ship.MoveLeft()
if event.key == pygame.K_RIGHT:
print 'RIGHT'
ship.MoveRight()
if event.key == pygame.K_UP:
print 'UP'
ship.MoveUp()
if event.key == pygame.K_DOWN:
print 'DOWN'
ship.MoveDown()
def main():
screen = pygame.display.set_mode((640, 480))
pygame.display.set_caption("Seek and Destroy")
background = pygame.Surface(screen.get_size())
clock = pygame.time.Clock()
screen.blit(background, (0, 0))
terminator = Terminator(screen)
humans = []
for people in range(15):
people = Humans(screen)
humans.append(people)
terminatorGroup = pygame.sprite.Group(terminator)
humanGroup = pygame.sprite.Group(humans)
clock = pygame.time.Clock()
keepGoing = True
pygame.key.set_repeat(10, 10)
while keepGoing:
clock.tick(60)
pygame.mouse.set_visible(False)
for event in pygame.event.get():
if event.type == pygame.QUIT:
keepGoing = False
if event.type == pygame.KEYDOWN:
myData = (event, terminator)
checkKeys(myData)
#if pygame.sprite.spritecollide(terminator, humanGroup, False):
terminatorGroup.clear(screen, background)
terminatorGroup.update()
terminatorGroup.draw(screen)
humanGroup.clear(screen, background)
humanGroup.update()
humanGroup.draw(screen)
pygame.display.flip()
pygame.mouse.set_visible(True)
if __name__ == "__main__":
main()
<code>

Answer 1

I just finished up this set of examples last night! Check out the Lunar Lander example, especially the way I'm handling vectors in lunarlander.py - it provides a class, V, for vector management.
What you'll probably need is a sprite for your guy with a vector representing his speed (moment-to-moment, probably 0) and angle, then a sprite for each random dot with a similar vector and angle. When you shoot, create a new sprite with a vector whose angle matches the current angle your guy is facing and magnitude matches the speed of the bullet. Then, in the update() method, move each sprite (bullet, random-dot). Very similar to what I'm doing in lunarlander.py.
Good luck! If you've just started Python, that's a tough assignment. Happy coding!