zp1/backend/src/main/java/com/zombie/game/model/Bullet.java

package com.zombie.game.model;

import lombok.Getter;
import java.util.*;

import static com.zombie.game.model.Constants.*;

/**
 * 子弹/投掷物类
 *
 * 管理玩家和僵尸发射的子弹、手榴弹等投掷物。
 * 支持普通子弹的直线飞行和手榴弹的抛物线轨迹。
 */
@Getter
public class Bullet {
    private int id;
    private float x, y;
    private float z;
    private float vx, vy, vz;
    private float speed;
    private int damage;
    private String ownerId;
    private int weaponIndex;
    private float range;
    private float distanceTraveled;
    private boolean explosive;
    private float explosionRadius;
    private float flightTime;
    private float maxFlightTime;
    private float targetX, targetY;
    private boolean isGrenade;

    public Bullet(int id, float x, float y, float angle, float speed, int damage,
                  String ownerId, int weaponIndex, float range) {
        this.id = id;
        this.x = x;
        this.y = y;
        this.z = 0.5f;
        this.speed = speed;
        this.vx = (float) Math.sin(angle) * speed;
        this.vy = (float) Math.cos(angle) * speed;
        this.vz = 0;
        this.damage = damage;
        this.ownerId = ownerId;
        this.weaponIndex = weaponIndex;
        this.range = range;
        this.distanceTraveled = 0;
        this.explosive = false;
        this.explosionRadius = 0;
        this.flightTime = 0;
        this.maxFlightTime = 0;
        this.isGrenade = false;
        this.targetX = x + (float) Math.sin(angle) * range;
        this.targetY = y + (float) Math.cos(angle) * range;
    }

    /**
     * 构造函数 - 手榴弹
     *
     * @param id 子弹ID
     * @param startX 起始X坐标
     * @param startY 起始Y坐标
     * @param targetX 目标X坐标
     * @param targetY 目标Y坐标
     * @param flightDuration 飞行时长
     * @param damage 伤害值
     * @param ownerId 发射者ID
     * @param explosionRadius 爆炸半径
     */
    public Bullet(int id, float startX, float startY, float targetX, float targetY,
                  float flightDuration, int damage, String ownerId, float explosionRadius) {
        this.id = id;
        this.x = startX;
        this.y = startY;
        this.z = 0.5f;
        this.targetX = targetX;
        this.targetY = targetY;
        this.damage = damage;
        this.ownerId = ownerId;
        this.weaponIndex = -1;
        this.range = 0;
        this.distanceTraveled = 0;
        this.explosive = true;
        this.explosionRadius = explosionRadius;
        this.flightTime = 0;
        this.maxFlightTime = flightDuration;
        this.isGrenade = true;
        this.speed = 0;

        float dx = targetX - startX;
        float dy = targetY - startY;
        this.vx = dx / flightDuration;
        this.vy = dy / flightDuration;
        this.vz = 3.0f;
    }

    public boolean update(float dt, GameMap map) {
        if (isGrenade) {
            flightTime += dt;

            x += vx * dt;
            y += vy * dt;

            float progress = flightTime / maxFlightTime;
            z = 0.5f + 4.0f * (float) Math.sin(progress * Math.PI);

            if (flightTime >= maxFlightTime || z <= 0.5f && progress > 0.5f) {
                return false;
            }

            if (x < 0 || x >= GRID_SIZE || y < 0 || y >= GRID_SIZE) {
                return false;
            }

            return true;
        } else {
            float moveX = vx * dt;
            float moveY = vy * dt;
            x += moveX;
            y += moveY;
            distanceTraveled += (float) Math.sqrt(moveX * moveX + moveY * moveY);

            if (distanceTraveled >= range) return false;
            if (x < 0 || x >= GRID_SIZE || y < 0 || y >= GRID_SIZE) return false;

            int gx = (int) Math.floor(x);
            int gy = (int) Math.floor(y);
            // 只有碰到静态墙壁才销毁子弹，碰到坚果墙体让碰撞检测处理
            Wall wall = map.getWall(gx, gy);
            if (wall instanceof StaticWall) return false;

            return true;
        }
    }

    /**
     * 检测子弹是否命中实体
     *
     * @param ex 实体X坐标
     * @param ey 实体Y坐标
     * @param size 实体碰撞体大小
     * @return true 表示命中
     */
    public boolean hitsEntity(float ex, float ey, float size) {
        float dx = x - ex;
        float dy = y - ey;
        float dist = (float) Math.sqrt(dx * dx + dy * dy);
        return dist < size / 2 + 0.1f;
    }

    /**
     * 将子弹状态转换为Map格式，用于网络传输
     *
     * @return 包含子弹状态的Map
     */
    public Map<String, Object> toStateMap() {
        Map<String, Object> map = new LinkedHashMap<>();
        map.put("id", id);
        map.put("x", x);
        map.put("y", y);
        map.put("z", z);
        if (isGrenade) {
            map.put("angle", (float) Math.atan2(vx, vy));
            map.put("targetX", targetX);
            map.put("targetY", targetY);
        } else {
            map.put("angle", (float) Math.atan2(vx, vy));
        }
        map.put("weaponIndex", weaponIndex);
        map.put("ownerId", ownerId);
        return map;
    }
}