Add bullet arc and number of bullets generated.

加入子弹弧度和产生子弹的数量

prefab/weapons/StaffNecromancy.tscn

@@ -16,7 +16,10 @@ size = Vector2(49, 5.25)
 [node name="StaffOfTheUndead" type="RigidBody2D"]
 collision_layer = 8
 collision_mask = 34
+angular_damp = -1.0
 script = ExtResource("1_w8hhv")
+OffsetAngle = 0.523
+NumberOfProjectiles = 15.0
 ProjectileScenes = [ExtResource("2_34250"), ExtResource("3_hk5nr")]
 Sequentially = true
 FiringIntervalAsMillisecond = 300

scripts/weapon/ProjectileWeapon.cs

@@ -22,6 +22,18 @@ public partial class ProjectileWeapon : WeaponTemplate
     /// </summary>
     private Marker2D? _marker2D;
 
+    /// <summary>
+    /// <para>Scattering radians</para>
+    /// <para>散射弧度</para>
+    /// </summary>
+    [Export] protected float OffsetAngle;
+    
+    /// <summary>
+    /// <para>The number of projectiles fired at once</para>
+    /// <para>一次可以发射多少个子弹</para>
+    /// </summary>
+    [Export] protected float NumberOfProjectiles = 1;
+
     [Export] protected PackedScene[] ProjectileScenes { get; set; } = [];
 
     /// <summary>
@@ -57,6 +69,24 @@ public partial class ProjectileWeapon : WeaponTemplate
         }
     }
 
+    /// <summary>
+    /// <para>GetRandomAngle</para>
+    /// <para>获取随机的偏移弧度</para>
+    /// </summary>
+    /// <returns></returns>
+    private float GetRandomAngle()
+    {
+        if (OffsetAngle == 0)
+        {
+            //If the offset angle is 0, then return 0
+            //弧度为0,不用偏移。
+            return 0;
+        }
+
+        var min = -OffsetAngle / 2;
+        return min + RandomUtils.Instance.NextSingle() * OffsetAngle;
+    }
+
 
     protected override void DoFire(Node2D? owner, Vector2 enemyGlobalPosition)
     {
@@ -89,6 +119,8 @@ public partial class ProjectileWeapon : WeaponTemplate
         //Get the first projectile
         //获取第一个抛射体
         var projectileScene = GetNextProjectileScene();
+        for (int i = 0; i < NumberOfProjectiles; i++)
+        {
             var projectile = NodeUtils.InstantiatePackedScene<Projectile>(projectileScene);
             if (projectile == null) return;
             if (Config.IsDebug())
@@ -103,7 +135,9 @@ public partial class ProjectileWeapon : WeaponTemplate
 
             NodeUtils.CallDeferredAddChild(GameSceneNodeHolder.ProjectileContainer, projectile);
             projectile.Owner = owner;
-        projectile.Velocity = (enemyGlobalPosition - _marker2D.GlobalPosition).Normalized() * projectile.Speed;
+            projectile.Velocity =
+                ((enemyGlobalPosition - _marker2D.GlobalPosition).Normalized() * projectile.Speed).Rotated(GetRandomAngle());
             projectile.Position = _marker2D.GlobalPosition;
         }
+    }
 }