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mconline/10-addon教程/第07章：自定义生物/课程16.练习2-会攻击侵犯领地的凶狠水鸭.md
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mconline/10-addon教程/第07章：自定义生物/课程16.练习2-会攻击侵犯领地的凶狠水鸭.md
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---
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front:
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hard: 进阶
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time: 20分钟
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---
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# 练习2：会攻击侵犯领地的凶狠水鸭
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#### 作者：境界
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凶狠水鸭示例包下载：下载[示例包](https://g79.gdl.netease.com/guidedemo-case7v2.zip)。
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```
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{
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"format_version": "1.16.0",
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"minecraft:entity": {
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"description": {
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"identifier": "design:green_head_duck",
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"is_spawnable": true,
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"is_summonable": true,
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"is_experimental": false,
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"runtime_identifier": "design:green_head_duck"
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},
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"component_groups": {
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},
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"components": {
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"minecraft:breathable": {
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"total_supply": 15,
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"suffocate_time": 0
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},
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"minecraft:collision_box": {
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"width": 0.6,
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"height": 1.0
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},
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"minecraft:nameable": {
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},
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"minecraft:health": {
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"value": 4,
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"max": 4
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},
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"minecraft:hurt_on_condition": {
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"damage_conditions": [
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{
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"filters": { "test": "in_lava", "subject": "self", "operator": "==", "value": true },
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"cause": "lava",
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"damage_per_tick": 4
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}
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]
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},
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"minecraft:movement": {
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"value": 0.25
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},
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"minecraft:damage_sensor": {
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"triggers": {
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"cause": "fall",
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"deals_damage": false
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}
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},
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"minecraft:behavior.rise_to_liquid_level": {
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"priority": 0,
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"liquid_y_offset": -0.5,
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"rise_delta": 0.01,
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"sink_delta": 0.01
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},
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"minecraft:leashable": {
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"soft_distance": 4.0,
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"hard_distance": 6.0,
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"max_distance": 10.0
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},
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"minecraft:balloonable": {
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"mass": 0.5
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},
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"minecraft:navigation.walk": {
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"can_path_over_water": true,
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"can_sink": false,
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"avoid_damage_blocks": true
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},
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"minecraft:movement.basic": {
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},
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"minecraft:jump.static": {
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},
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"minecraft:can_climb": {
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},
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"minecraft:despawn": {
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"despawn_from_distance": {}
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},
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"minecraft:behavior.panic": {
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"priority": 1,
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"speed_multiplier": 1.5
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},
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"minecraft:behavior.tempt": {
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"priority": 4,
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"speed_multiplier": 1.0,
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"items": [
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"wheat_seeds",
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"beetroot_seeds",
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"melon_seeds",
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"pumpkin_seeds"
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]
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},
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"minecraft:type_family": {
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"family": [ "duck", "mob" ]
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},
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"minecraft:behavior.melee_attack": {
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"priority": 3,
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"speed_multiplier": 1,
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"track_target": false
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},
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"minecraft:behavior.nearest_attackable_target": {
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"priority": 2,
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"reselect_targets": true,
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"must_see": false,
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"entity_types": [
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{
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"filters": {
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"all_of": [
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{ "test": "is_family", "subject": "other", "value": "mob" },
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{ "test": "is_family", "subject": "other", "operator": "not", "value": "duck"}
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]
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},
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"max_dist": 5
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}
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]
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},
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"minecraft:attack": {
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"damage": 1
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},
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"minecraft:behavior.random_stroll": {
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"priority": 6,
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"speed_multiplier": 1.0
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},
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"minecraft:behavior.look_at_player": {
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"priority": 7,
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"look_distance": 6.0,
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"probability": 0.02
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},
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"minecraft:behavior.random_look_around": {
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"priority": 8
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},
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"minecraft:physics": {
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},
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"minecraft:pushable": {
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"is_pushable": true,
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"is_pushable_by_piston": true
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}
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},
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"events": {
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}
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}
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}
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```
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攻击侵犯领地的行为，可以想象成为靠近水鸭多近会引起水鸭的攻击。因此在设置一个生物拥有近战能力的时候，需要用三个行为进行组合：
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1）minecraft:attack，它的damage值可以接受一个数组，也可以接受一个整数数值。数组情况下，可以让伤害在数组内由大到小取一个随机伤害，而一个固定数值则代表的是固定伤害。
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2）minecraft:behavior.nearest_attackable_target，它的entity_types接受一连串的生物目标，我们在目标选择器中，同时将目标设置为mob，但又不是duck，即所有带有mob标签却不带有duck标签的生物。max_dist代表在多远距离内会被当作目标，must_see意为是否必须看到才会当作目标，reselect_targets会在一群目标里不断选择离自己最近的目标。
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3）minecraft:behavior.melee_attack,它的speed_multiplier接收一个浮点数值，即保持进攻状态时，速度会给予多少的加成，1为100%，则保持原速，1.5则是150%。track_target接收一个布尔值，若设置为true则会不停跟着目标，即使走出攻击范围，false则会在目标离开攻击范围后停止行为。
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特别注意：由于minecraft:type_family组件用来标记生物的家族类型，原版鸡携带的家族标签为"mob“和"chicken"，理论上，所有原版的生物都带有这个mob标签，我们将水鸭的标签保留了mob标签，也是为了允许其他原版生物在处理一些需要判断生物标签的行为，如寻找目标的时候，能够将水鸭纳入目标范围内，更加的贴近原版的生态。除此之外，我们将chicken改为duck，一个是强调实体携带duck标签，另一个是为了在自身寻找目标的行为当中，将同为duck标签的实体剔除出目标范围。若保持原来鸡的写法，则会变成需要剔除chicken标签的实体，那样就会包括了鸡这类生物，不符合实际需求。
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