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#! /usr/bin/env python
"""
Creation of enemy sprites and movement
@license: U{http://creativecommons.org/licenses/by-sa/3.0/us/}
"""
from basicMovement import basicMovement
import pygame
import sys
import random
class ghostMovement(pygame.sprite.Sprite):
def __init__(self, g, q):
"""
Creates a Enemy sprite
@type g: number 1-4
@param g: The number identifying this ghost, used to associate image
@type q: question object
@param q: The question object (unused?)
"""
pygame.sprite.Sprite.__init__(self)
self.name = 'Ghost'
self.question = q
if g == 0:
file = './images/ghost.png'
elif g == 1:
file = './images/ghost2.png'
elif g == 2:
file = './images/ghost3.png'
elif g == 3:
file = './images/ghost4.png'
self.image = pygame.image.load(file).convert_alpha()
self.freezeImage = pygame.image.load('./images/ghost_freeze.png').convert_alpha()
# Save a copy of the screen's rectangle
self.screen = pygame.display.get_surface().get_rect()
self.freezeTime = 0
#initialize the move instance
self.move = basicMovement()
# Create a variable to store the previous position of the sprite
self.old = self.image.get_rect()
self.old.x = 300
self.old.y = 300
# Create a variable to store the current position of the sprite
self.rect = self.image.get_rect()
self.rect.x = 300
self.rect.y = 300
def randomMovement(self):
"""
Randomly generates the movement of the enemy
@rtype: [dx, dy]
@return: returns the amount to move by
"""
on = 1 #0 is off and 1 is on
#dx and dy are delta x and y for the change in x and y position
dx = 0
dy = 0
#speed/incremental value
speed = 25
amount = [0, 0]
# simply move around randomly
# random x and random y
while dx == 0:
dx = random.randint(-1, 1)
while dy == 0:
dy = random.randint(-1, 1)
dx = dx * speed * on
dy = dy * speed * on
#for determining which direction to update
movementVal = random.randint(1, 10)
moving = self.move.getMoving()
if moving == False:
#half the time it will update the x and the other half the y
if movementVal > 5:
amount = [dx, 0]
self.move.moving = True
else:
amount = [0, dy]
self.move.moving = True
elif moving == True:
#keep going in the same direction
dx = self.rect.x - self.old.x
dy = self.rect.y - self.old.y
amount = [dx, dy]
# return
return amount
def update(self, screen, MAZE_SIZE, mazeObj):
"""
Updates enemy sprite using random movement
@type screen: pygame.display
@param screen: the screen in which we will draw
@param MAZE_SIZE: size of maze
@type mazeObj: Maze
@param mazeObj: an instance of the maze
"""
# call basic movement and add any other update
amount = self.randomMovement()
if self.freezeTime > 0:
amount = [0,0]
self.move.moving = False
self.move.update(screen, self, amount, MAZE_SIZE, mazeObj)
# Create a Surface the size of our character
blank = pygame.Surface((self.rect.width, self.rect.height))
blank.fill((0, 0, 0))
i = 0 # image index
# Erase the old position by putting our blank Surface on it
screen.blit(blank, self.old)
#draw whatever we erased because there may be a pellet there
gridX = int(round(self.old.x/MAZE_SIZE, 0) )
gridY = int(round(self.old.y/MAZE_SIZE, 0) )
mazeObj.drawPoint(screen, gridX, gridY)
# Draw the new position
if self.freezeTime > 0:
if self.freezeTime%2 == 1 and self.freezeTime > 5:
screen.blit(self.freezeImage, self.rect)
else:
screen.blit(self.image, self.rect)
self.freezeTime -= 1
else:
screen.blit(self.image, self.rect)
# Update ONLY the modified areas of the screen
pygame.display.update([self.old, self.rect])
def clearSelf(self, screen, mazeObj):
"""
Draws the grid square occupied by this ghost at the location in 'rect'
@type screen: pygame.display
@param screen: the screen in which we will draw
@type mazeObj: Maze
@param mazeObj: an instance of the maze
"""
gridX = int(round(self.rect.x/MAZE_SIZE, 0) )
gridY = int(round(self.rect.y/MAZE_SIZE, 0) )
mazeObj.drawPoint(screen, gridX, gridY)
pygame.display.update(self.rect)
def drawSelf(self, screen):
"""
Draws this ghost's image onto the screen at the location in 'rect'
@type screen: pygame.display
@param screen: the screen in which we will draw
"""
screen.blit(self.image, self.rect)
pygame.display.update(self.rect)
def freeze(self, time):
"""
Adds freezetime to this ghost, not letting it move for a given number
of 'update' calls
@param time: the number of update calls for which it should freeze
"""
self.freezeTime += time
def eaten(self):
"""
Called when this ghost is eaten, moving it back to spawn
"""
self.rect.x = 300
self.rect.y = 300
self.move.moving = False
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