Mercurial > rinkhals
view gamelib/animal.py @ 407:bdc8bc78a796
Handle corner case aroudn entering the map
author | Neil Muller <drnlmuller@gmail.com> |
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date | Sat, 21 Nov 2009 06:44:19 +0000 |
parents | f8072b2d6dd1 |
children | bdc4757e0497 |
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"""Class for the various animals in the game""" import random from pgu.vid import Sprite from pgu.algo import getline import imagecache import tiles from misc import Position import sound import equipment import animations class Animal(Sprite): """Base class for animals""" STEALTH = 0 VISION_BONUS = 0 VISION_RANGE_PENALTY = 10 def __init__(self, image_left, image_right, tile_pos): # Create the animal somewhere far off screen Sprite.__init__(self, image_left, (-1000, -1000)) self._image_left = image_left self.image_left = image_left.copy() self._image_right = image_right self.image_right = image_right.copy() if hasattr(tile_pos, 'to_tile_tuple'): self.pos = tile_pos else: self.pos = Position(tile_pos[0], tile_pos[1], 0) self.equipment = [] self.accoutrements = [] self.abode = None self.facing = 'left' def loop(self, tv, _sprite): ppos = tv.tile_to_view(self.pos.to_tile_tuple()) self.rect.x = ppos[0] self.rect.y = ppos[1] def die(self, gameboard): """Play death animation, noises, whatever.""" if hasattr(self, 'DEATH_SOUND'): sound.play_sound(self.DEATH_SOUND) if hasattr(self, 'DEATH_ANIMATION'): self.DEATH_ANIMATION(gameboard.tv, self.pos.to_tile_tuple()) self._game_death(gameboard) def _game_death(self, gameboard): # Call appropriate gameboard cleanup here. pass def move(self, state): """Given the game state, return a new position for the object""" # Default is not to move pass def attack(self, gameboard): """Given the game state, attack a suitable target""" # Default is not to attack pass def set_pos(self, tile_pos): """Move an animal to the given tile_pos.""" new_pos = Position(*tile_pos) self._fix_face(new_pos) self.pos = new_pos def _fix_face(self, facing_pos): """Set the face correctly""" if facing_pos.left_of(self.pos): self._set_image_facing('left') elif facing_pos.right_of(self.pos): self._set_image_facing('right') def _set_image_facing(self, facing): self.facing = facing if self.facing == 'left': self.setimage(self.image_left) elif self.facing == 'right': self.setimage(self.image_right) def equip(self, item): if equipment.is_equipment(item): self.equipment.append(item) elif equipment.is_accoutrement(item): self.accoutrements.append(item) self.redraw() def unequip(self, item): if equipment.is_equipment(item): self.equipment = [e for e in self.equipment if e != item] elif equipment.is_accoutrement(item): self.accoutrements = [e for e in self.accoutrements if e != item] self.redraw() def unequip_by_name(self, item_name): # only remove first match matches = [item for item in self.equipment + self.accoutrements if item.NAME == item_name] if matches: self.unequip(matches[0]) def redraw(self): layers = [(self._image_left.copy(), self._image_right.copy(), 0)] if hasattr(self, 'EQUIPMENT_IMAGE_ATTRIBUTE'): for item in self.accoutrements + self.equipment: images = item.images(self.EQUIPMENT_IMAGE_ATTRIBUTE) if images: layers.append(images) layers.sort(key=lambda l: l[2]) # these always go on the bottom so that other layers don't get overwritten self.image_left = self._image_left.copy() self.image_right = self._image_right.copy() for l in layers: self.image_left.blit(l[0], (0,0)) self.image_right.blit(l[1], (0,0)) self._set_image_facing(self.facing) def weapons(self): return [e for e in self.equipment if equipment.is_weapon(e)] def armour(self): return [e for e in self.equipment if equipment.is_armour(e)] def covers(self, tile_pos): return tile_pos[0] == self.pos.x and tile_pos[1] == self.pos.y def outside(self): return self.abode is None def damage(self, gameboard): for a in self.armour(): if not a.survive_damage(): self.unequip(a) return True self.die(gameboard) return False class Chicken(Animal): """A chicken""" EQUIPMENT_IMAGE_ATTRIBUTE = 'CHICKEN_IMAGE_FILE' DEATH_ANIMATION = animations.ChickenDeath DEATH_SOUND = 'kill-chicken.ogg' def __init__(self, pos): image_left = imagecache.load_image('sprites/chkn.png') image_right = imagecache.load_image('sprites/chkn.png', ("right_facing",)) Animal.__init__(self, image_left, image_right, pos) self.eggs = [] def _game_death(self, gameboard): gameboard.remove_chicken(self) def move(self, gameboard): """A free chicken will move away from other free chickens""" pass def lay(self): """See if the chicken lays an egg""" if not self.eggs: for x in range(random.randint(1, 4)): self.eggs.append(Egg(self.pos)) self.equip(equipment.NestEgg()) def remove_eggs(self): """Clean up the egg state""" self.eggs = [] self.unequip_by_name("Nestegg") def remove_one_egg(self): """Clean up the egg state""" self.eggs.pop() if not self.eggs: self.unequip_by_name("Nestegg") def get_num_eggs(self): return len(self.eggs) def hatch(self, gameboard): """See if we have an egg to hatch""" if self.eggs: chick = self.eggs[0].hatch() if chick: # sell the remaining eggs # Remove hatched egg self.eggs.pop() gameboard.eggs -= 1 # Sell other eggs for egg in self.eggs[:]: gameboard.sell_one_egg(self) self.remove_eggs() # clean up stale images, etc. return chick return None def _find_killable_fox(self, weapon, gameboard): """Choose a random fox within range of this weapon.""" killable_foxes = [] for fox in gameboard.foxes: if not visible(self, fox): continue if weapon.in_range(gameboard, self, fox): killable_foxes.append(fox) if not killable_foxes: return None return random.choice(killable_foxes) def attack(self, gameboard): """An armed chicken will attack a fox within range.""" if not self.weapons(): # Not going to take on a fox bare-winged. return # Choose the first weapon equipped. weapon = self.weapons()[0] fox = self._find_killable_fox(weapon, gameboard) if not fox: return self._fix_face(fox.pos) if weapon.hit(gameboard, self, fox): fox.damage(gameboard) class Egg(Animal): """An egg""" def __init__(self, pos): image = imagecache.load_image('sprites/equip_egg.png') Animal.__init__(self, image, image, pos) self.timer = 2 # Eggs don't move def hatch(self): self.timer -= 1 if self.timer == 0: return Chicken(self.pos) return None class Fox(Animal): """A fox""" STEALTH = 20 IMAGE_FILE = 'sprites/fox.png' DEATH_ANIMATION = animations.FoxDeath DEATH_SOUND = 'kill-fox.ogg' CONFIG_NAME = 'fox' costs = { # weighting for movement calculation 'grassland' : 2, 'woodland' : 1, # Try to keep to the woods if possible 'broken fence' : 2, 'fence' : 25, 'guardtower' : 2, # We can pass under towers 'henhouse' : 30, # Don't go into a henhouse unless we're going to # catch a chicken there 'hendominium' : 30, } def __init__(self, pos): image_left = imagecache.load_image(self.IMAGE_FILE) image_right = imagecache.load_image(self.IMAGE_FILE, ("right_facing",)) Animal.__init__(self, image_left, image_right, pos) self.landmarks = [self.pos] self.hunting = True self.dig_pos = None self.tick = 0 self.safe = False self.closest = None self.last_steps = [] # Foxes don't occupy places in the same way chickens do, but they # can still be inside self.building = None def outside(self): return self.building is None def _game_death(self, gameboard): gameboard.kill_fox(self) def _cost_tile(self, pos, gameboard): if gameboard.in_bounds(pos): this_tile = gameboard.tv.get(pos.to_tile_tuple()) cost = self.costs.get(tiles.TILE_MAP[this_tile], 100) else: cost = 100 # Out of bounds is expensive return cost def _cost_path(self, path, gameboard): """Calculate the cost of a path""" total = 0 for pos in path: total += self._cost_tile(pos, gameboard) return total def _gen_path(self, start_pos, final_pos): """Construct a direct path from start_pos to final_pos, excluding start_pos""" if abs(start_pos.x - final_pos.x) < 2 and \ abs(start_pos.y - final_pos.y) < 2: # pgu gets this case wrong on occasion. return [final_pos] start = start_pos.to_tile_tuple() end = final_pos.to_tile_tuple() points = getline(start, end) points.remove(start) # exclude start_pos if end not in points: # Rounding errors in getline cause this points.append(end) return [Position(x[0], x[1]) for x in points] def _find_best_path_step(self, final_pos, gameboard): """Find the cheapest path to final_pos, and return the next step along the path.""" # We calculate the cost of the direct path if final_pos.z < self.pos.z: # We need to try heading down. return Position(self.pos.x, self.pos.y, self.pos.z - 1) if final_pos.x == self.pos.x and final_pos.y == self.pos.y and \ final_pos.z > self.pos.z: # We try heading up return Position(self.pos.x, self.pos.y, self.pos.z + 1) cur_dist = final_pos.dist(self.pos) if cur_dist < 2: # We're right ontop of our target, so just go there return final_pos # Find the cheapest spot close to us that moves us closer to the target neighbours = [Position(self.pos.x + x, self.pos.y + y, self.pos.z) for x in range(-1, 2) for y in range(-1, 2) if (x, y) != (0, 0)] best_pos = self.pos min_cost = 1000 min_dist = cur_dist for point in neighbours: dist = point.dist(final_pos) if dist < cur_dist: cost = self._cost_tile(point, gameboard) if cost < min_cost or (min_cost == cost and dist < min_dist): # Prefer closest of equal cost points min_dist = dist min_cost = cost best = point if min_cost < 20 or not gameboard.in_bounds(self.pos): # If we're not on the gameboard yet, there's no point in looking # for an optimal path. return best # Else expensive step, so think further direct_path = self._gen_path(self.pos, final_pos) min_cost = self._cost_path(direct_path, gameboard) min_path = direct_path # is there a point nearby that gives us a cheaper direct path? # This is delibrately not finding the optimal path, as I don't # want the foxes to be too intelligent, although the implementation # isn't well optimised yet # FIXME: Currently, this introduces loops, but the memory kind # avoids that. Fixing this is the next goal. poss = [Position(self.pos.x + x, self.pos.y + y, self.pos.z) for x in range(-3, 4) for y in range(-3, 4) if (x, y) != (0, 0)] for start in poss: cand_path = self._gen_path(self.pos, start) + \ self._gen_path(start, final_pos) cost = self._cost_path(cand_path, gameboard) if cost < min_cost: min_cost = cost min_path = cand_path if not min_path: return final_pos return min_path[0] def _find_path_to_woodland(self, gameboard): """Dive back to woodland through the landmarks""" # find the closest point to our current location in walked path if self.pos == self.landmarks[-1]: if len(self.landmarks) > 1: self.landmarks.pop() # Moving to the next landmark if not gameboard.in_bounds(self.pos) and not self.hunting: # Safely out of sight self.safe = True return self.pos return self._find_best_path_step(self.landmarks[-1], gameboard) def _find_path_to_chicken(self, gameboard): """Find the path to the closest chicken""" # Find the closest chicken min_dist = 999 if self.closest not in gameboard.chickens: # Either no target, or someone ate it self.closest = None for chicken in gameboard.chickens: dist = chicken.pos.dist(self.pos) if chicken.abode: dist += 5 # Prefer free-ranging chickens if len(chicken.weapons()) > 0: dist += 5 # Prefer unarmed chickens if dist < min_dist: min_dist = dist self.closest = chicken if not self.closest: # No more chickens, so leave self.hunting = False return self.pos if self.closest.pos == self.pos: # No need to move return self.pos if self.closest.pos.to_tile_tuple() == self.pos.to_tile_tuple(): # Only differ in z, so next step is in z if self.closest.pos.z < self.pos.z: new_z = self.pos.z - 1 else: new_z = self.pos.z + 1 return Position(self.pos.x, self.pos.y, new_z) return self._find_best_path_step(self.closest.pos, gameboard) def attack(self, gameboard): """Attack a chicken""" chicken = gameboard.get_animal_at_pos(self.pos, 'chicken') if chicken: # Always attack a chicken we step on, even if not hunting self._catch_chicken(chicken, gameboard) def _catch_chicken(self, chicken, gameboard): """Catch a chicken""" chicken.damage(gameboard) self.closest = None self.hunting = False self.last_steps = [] # Forget history here def _update_pos(self, gameboard, new_pos): """Update the position, making sure we don't step on other foxes""" if new_pos == self.pos: # We're not moving, so we can skip all the checks return new_pos blocked = gameboard.get_animal_at_pos(new_pos, 'fox') is not None if not blocked and new_pos.z == self.pos.z: # We're only worried about loops when not on a ladder blocked = new_pos in self.last_steps final_pos = new_pos if blocked: if new_pos.z != self.pos.z: # We can only move up and down a ladder moves = [Position(self.pos.x, self.pos.y, z) for z in range(self.pos.z-1, self.pos.z + 2) if z >= 0] else: moves = [Position(x, y) for x in range(self.pos.x-1, self.pos.x + 2) for y in range(self.pos.y-1, self.pos.y + 2) if Position(x,y) != self.pos and Position(x, y) not in self.last_steps and self.pos.z == 0] # find the cheapest point in moves that's not blocked final_pos = None min_cost = 1000 for poss in moves: if gameboard.get_animal_at_pos(poss, 'fox'): continue # blocked cost = self._cost_tile(poss, gameboard) if cost < min_cost: min_cost = cost final_pos = poss if cost == min_cost and random.randint(0, 1) > 0: # Add some randomness in this case final_pos = poss if not final_pos: # No good choice, so stay put return self.pos if gameboard.in_bounds(final_pos): this_tile = gameboard.tv.get(final_pos.to_tile_tuple()) else: this_tile = tiles.REVERSE_TILE_MAP['woodland'] if tiles.TILE_MAP[this_tile] == 'broken fence' and self.hunting: # We'll head back towards the holes we make/find self.landmarks.append(final_pos) elif tiles.TILE_MAP[this_tile] == 'fence' and not self.dig_pos: self._dig(gameboard, final_pos) return self.pos self.last_steps.append(final_pos) if len(self.last_steps) > 3: self.last_steps.pop(0) return final_pos def _dig(self, gameboard, dig_pos): """Setup dig parameters, to be overridden if needed""" self.tick = 5 self.dig_pos = dig_pos def _make_hole(self, gameboard): """Make a hole in the fence""" fence = gameboard.get_building(self.dig_pos.to_tile_tuple()) # Another fox could have made the same hole this turn if fence: fence.damage(gameboard.tv) self.dig_pos = None def move(self, gameboard): """Foxes will aim to move towards the closest henhouse or free chicken""" if self.safe: # We're safe, so do nothing return elif self.dig_pos: if self.tick: self.tick -= 1 # We're still digging through the fence # Check the another fox hasn't dug a hole for us # We're too busy digging to notice if a hole appears nearby, # but we'll notice if the fence we're digging vanishes this_tile = gameboard.tv.get(self.dig_pos.to_tile_tuple()) if tiles.TILE_MAP[this_tile] == 'broken fence': self.tick = 0 else: # We've dug through the fence, so make a hole self._make_hole(gameboard) return elif self.hunting: desired_pos = self._find_path_to_chicken(gameboard) else: desired_pos = self._find_path_to_woodland(gameboard) final_pos = self._update_pos(gameboard, desired_pos) self._fix_face(final_pos) self.pos = final_pos change_visible = False # See if we're entering/leaving a building building = gameboard.get_building(final_pos.to_tile_tuple()) if building and self.outside(): # Check if we need to enter if self.closest and not self.closest.outside() and \ self.closest.abode.building is building: building.add_predator(self) change_visible = True elif self.building and final_pos.z == 0: # can only leave from the ground floor if building == self.building: # Check if we need to leave the building if not self.hunting or (self.closest and self.closest.abode.building is not building): self.building.remove_predator(self) change_visible = True else: # we've moved away from the building we were in self.building.remove_predator(self) change_visible = True if change_visible: gameboard.set_visibility(self) class NinjaFox(Fox): """Ninja foxes are hard to see""" STEALTH = 60 IMAGE_FILE = 'sprites/ninja_fox.png' CONFIG_NAME = 'ninja fox' class DemoFox(Fox): """Demolition Foxes destroy fences easily""" DIG_ANIMATION = animations.FenceExplosion IMAGE_FILE = 'sprites/sapper_fox.png' CONFIG_NAME = 'sapper fox' costs = Fox.costs.copy() def __init__(self, pos): Fox.__init__(self, pos) self.costs['fence'] = 2 # We don't worry about fences def _dig(self, gameboard, dig_pos): """Setup dig parameters, to be overridden if needed""" self.tick = 0 # Costs us nothing to go through a fence. self.dig_pos = dig_pos self.DIG_ANIMATION(gameboard.tv, dig_pos.to_tile_tuple()) self._make_hole(gameboard) class GreedyFox(Fox): """Greedy foxes eat more chickens""" CONFIG_NAME = 'greedy fox' def __init__(self, pos): Fox.__init__(self, pos) self.chickens_eaten = 0 def _catch_chicken(self, chicken, gameboard): chicken.damage(gameboard) self.closest = None self.chickens_eaten += 1 if self.chickens_eaten > 2: self.hunting = False self.last_steps = [] class Rinkhals(Fox): """The Rinkhals has eclectic tastes""" STEALTH = 80 IMAGE_FILE = 'sprites/rinkhals.png' CONFIG_NAME = 'rinkhals' def _catch_chicken(self, chicken, gameboard): """The Rinkhals hunts for sport, catch and release style""" self.closest = None self.hunting = False self.last_steps = [] def _make_hole(self, gameboard): """The Rinkhals eats fences""" fence = gameboard.get_building(self.dig_pos.to_tile_tuple()) if fence: fence.remove(gameboard.tv) gameboard.remove_building(fence) self.dig_pos = None def damage(self, gameboard): """The Rinkhals is invincible!""" return True def _get_vision_param(parameter, watcher): param = getattr(watcher, parameter) if watcher.abode: modifier = getattr(watcher.abode.building, 'MODIFY_'+parameter, lambda r: r) param = modifier(param) return param def visible(watcher, watchee): vision_bonus = _get_vision_param('VISION_BONUS', watcher) range_penalty = _get_vision_param('VISION_RANGE_PENALTY', watcher) distance = watcher.pos.dist(watchee.pos) - 1 roll = random.randint(1, 100) return roll > watchee.STEALTH - vision_bonus + range_penalty*distance # These don't have to add up to 100, but it's easier to think # about them if they do. DEFAULT_FOX_WEIGHTINGS = ( (Fox, 59), (GreedyFox, 30), (NinjaFox, 5), (DemoFox, 5), (Rinkhals, 1), )