优化项目结构

src/main/java/uno/mloluyu/characters/effects/HitParticle.java

@@ -0,0 +1,54 @@
+package uno.mloluyu.characters.effects;
+
+import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
+import com.badlogic.gdx.math.MathUtils;
+
+/** 单个命中粒子：简单方块/短线喷射，带速度、重力与淡出。 */
+public class HitParticle {
+    private float x, y;
+    private float vx, vy;
+    private float life; // 剩余寿命
+    private final float totalLife;
+    private final float size;
+    private final Color color = new Color();
+    private static final float GRAVITY = 900f; // 轻微下坠
+
+    public HitParticle(float x, float y, Color base, float speedMin, float speedMax, float lifeMin, float lifeMax,
+            float sizeMin, float sizeMax) {
+        this.x = x;
+        this.y = y;
+        float ang = MathUtils.random(15f, 165f) * MathUtils.degreesToRadians; // 向上扇形
+        float spd = MathUtils.random(speedMin, speedMax);
+        this.vx = MathUtils.cos(ang) * spd;
+        this.vy = MathUtils.sin(ang) * spd;
+        this.life = MathUtils.random(lifeMin, lifeMax);
+        this.totalLife = life;
+        this.size = MathUtils.random(sizeMin, sizeMax);
+        // 基础色随机稍许扰动
+        float tint = MathUtils.random(0.85f, 1.05f);
+        this.color.set(base.r * tint, base.g * tint, base.b * tint, 1f);
+    }
+
+    public boolean isAlive() {
+        return life > 0f;
+    }
+
+    public void update(float dt) {
+        if (!isAlive())
+            return;
+        life -= dt;
+        // 运动积分
+        x += vx * dt;
+        y += vy * dt;
+        vy -= GRAVITY * dt * 0.35f; // 轻微重力
+    }
+
+    public void render(ShapeRenderer sr) {
+        if (!isAlive())
+            return;
+        float a = (life / totalLife); // 线性淡出
+        sr.setColor(color.r, color.g, color.b, a);
+        sr.rect(x - size / 2f, y - size / 2f, size, size);
+    }
+}