項目說明：https://inst.eecs.berkeley.edu/~cs61a/sp21/proj/ants/
螞蟻大戰蜜蜂 靈感來源：植物大戰僵屍（Plants Vs. Zombies，PVZ）
Phase 1： https://www.cnblogs.com/ikventure/p/14986805.html
Phase 2： https://www.cnblogs.com/ikventure/p/14988467.html
Phase 3： https://www.cnblogs.com/ikventure/p/14992754.html
Phase 4： https://www.cnblogs.com/ikventure/p/14994734.html
效果展示： https://www.cnblogs.com/ikventure/p/15001093.html
Phase 4: Water and Might
Problem 10 (2 pt)
目前place有Hive和基本場地兩種類型，現在引入水池類型Water。
只有watersafe的insect可以放置在Water中，在Insect引入is_watersafe的類屬性，蜜蜂可以飛，所以Bee.is_watersafe是True。
Water類：
add_insect方法，放置insect到place上，如果insect不是watersafe的，將該insect的生命值降至0，調用Insect類的reduce_health方法。
class Insect:
"""An Insect, the base class of Ant and Bee, has health and a Place."""
damage = 0
# ADD CLASS ATTRIBUTES HERE
is_watersafe = False
class Bee(Insect):
"""A Bee moves from place to place, following exits and stinging ants."""
name = 'Bee'
damage = 1
# OVERRIDE CLASS ATTRIBUTES HERE
is_watersafe = True
class Water(Place):
"""Water is a place that can only hold watersafe insects."""
def add_insect(self, insect):
"""Add an Insect to this place. If the insect is not watersafe, reduce
its health to 0."""
# BEGIN Problem 10
"*** YOUR CODE HERE ***"
super().add_insect(insect)
if not insect.is_watersafe:
insect.reduce_health(insect.health)
# END Problem 10
Problem 11 (2 pt)
引入水上射手ScubaThrower，繼承自ThrowerAnt，可以放置在Water場地中，只需要重寫name, is_watersafe, food_cost。
| Class | Food Cost | Initial Health |
|---|---|---|
| ScubaThrower | 6 | 1 |
代碼：
# BEGIN Problem 11
# The ScubaThrower class
class ScubaThrower(ThrowerAnt):
"""ScubaThrower is a watersafe ThrowerAnt."""
name = 'Scuba'
food_cost = 6
is_watersafe = True
implemented = True
# END Problem 11
Extra Credit (2 pt)
引入QueenAnt，一種防水的ScubaThrower，除了標准的ScubaThrower.action，每次行動時，它身后的所有螞蟻damage加倍（不包括FireAnt的反傷）。
| Class | Food Cost | Initial Health |
|---|---|---|
| QueenAnt | 7 | 1 |
QueenAnt有三種特殊的規則：
- queen生命值降至0，蜜蜂勝利。任一蜜蜂到達tunnel終點，蜜蜂同樣勝利。調用bees_win()。
- 只能存在一個真的queen，在第一個queen之后實例化的都是冒充者impostor，在第一次行動時生命值降為0，不會有增傷效果或者射手的效果；impostor死亡后游戲繼續。
- 真queen不能被移除 ，嘗試移除queen不會有效果，也不會造成異常。需要重寫QueenAnt中的Ant.remove_from。
思路：
- 同一個類的所有實例擁有相同的類屬性。要讓第一個實例為真，后面的所有實例為假，可以先設置is_true為真，在第一個實例化后修改類屬性。
- 通過Place.exit.ant獲取QueenAnt后面的螞蟻。
- 為了避免重復加倍螞蟻的damage，需要對有倍傷buff的螞蟻進行標記。在Ant中添加類屬性buffed = False。
- 加倍傷buff時，注意容器類螞蟻內部的contained螞蟻damage也要加倍。
# BEGIN Problem EC
class QueenAnt(ScubaThrower): # You should change this line
# END Problem EC
"""The Queen of the colony. The game is over if a bee enters her place."""
name = 'Queen'
food_cost = 7
# OVERRIDE CLASS ATTRIBUTES HERE
# BEGIN Problem EC
implemented = True # Change to True to view in the GUI
is_truequeen = True
# END Problem EC
def __init__(self, health=1):
# BEGIN Problem EC
"*** YOUR CODE HERE ***"
super().__init__(health)
self.is_truequeen = QueenAnt.is_truequeen
if self.is_truequeen:
QueenAnt.is_truequeen = False
# END Problem EC
def action(self, gamestate):
"""A queen ant throws a leaf, but also doubles the damage of ants
in her tunnel.
Impostor queens do only one thing: reduce their own health to 0.
"""
# BEGIN Problem EC
"*** YOUR CODE HERE ***"
if not self.is_truequeen:
self.reduce_health(self.health)
else:
ScubaThrower.action(self, gamestate)
behind = self.place.exit
while behind:
if behind.ant:
if not behind.ant.buffed:
behind.ant.damage *= 2
behind.ant.buffed = True
if behind.ant.is_container() and behind.ant.contained_ant:
if not behind.ant.contained_ant.buffed:
behind.ant.contained_ant.damage *= 2
behind.ant.contained_ant.buffed = True
behind = behind.exit
# END Problem EC
def reduce_health(self, amount):
"""Reduce health by AMOUNT, and if the True QueenAnt has no health
remaining, signal the end of the game.
"""
# BEGIN Problem EC
"*** YOUR CODE HERE ***"
if not self.is_truequeen:
Insect.reduce_health(self, amount)
else:
self.health -= amount
if self.health <= 0:
bees_win()
def remove_from(self, place):
if not self.is_truequeen:
Ant.remove_from(self, place)
# END Problem EC
Test
