Add blood drips while walking

Assets/Scripts/Effects/BloodDripper.cs

@@ -0,0 +1,38 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Saltosion.OneWeapon {
+    public class BloodDripper : MonoBehaviour {
+        public Vector2 DripOffset = new Vector2(0, -0.5f);
+        public int DripCount = 5;
+        public float DropInterval = 0.5f;
+
+        private Rigidbody2D ParentBody;
+        private int Drips = 0;
+        private bool Step = false;
+        private float LastDropTime;
+
+        private void Start() {
+            ParentBody = transform.parent.GetComponent<Rigidbody2D>();
+            DropInterval *= Random.value + 0.5f;
+            LastDropTime = Random.value * DropInterval + Time.time;
+        }
+
+        private void Update() {
+            if (ParentBody.velocity.magnitude > 0.1 && Time.time - LastDropTime > DropInterval) {
+                Step = !Step;
+                bool WalkingSideWays = Mathf.Abs(Vector2.Dot(ParentBody.velocity, new Vector2(1, 0))) > 0.5;
+                Vector2 Offset = DripOffset + new Vector2(-ParentBody.velocity.y, ParentBody.velocity.x).normalized *
+                    (WalkingSideWays ? 0.1f : 0.2f) *
+                    (Step ? 1f : -1f);
+                BloodLauncher.Splatter(ParentBody.position + Offset, Vector2.zero, 1 + (int)(Random.value * 5), 0f, 360f, false);
+                Drips++;
+                if (Drips >= DripCount) {
+                    Destroy(gameObject);
+                }
+                LastDropTime = Time.time;
+            }
+        }
+    }
+}

Assets/Scripts/Effects/BloodDripper.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 4d1575b7aca5970469125348cb12707d
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts/Effects/BloodLauncher.cs

@@ -12,15 +12,15 @@ namespace Saltosion.OneWeapon {
         public int MaxParticles;
         public bool DebugLaunch = false;
 
-        public static void Splatter(Vector2 origin, Vector2 direction, int particleCount, float force, float degrees) {
+        public static void Splatter(Vector2 origin, Vector2 direction, int particleCount, float force, float degrees, bool sticky = true) {
-            LaunchParticles(Singleton.GetGorePrefab(), origin, direction, particleCount, force, degrees);
+            LaunchParticles(Singleton.GetGorePrefab(), origin, direction, particleCount, force, degrees, sticky);
         }
 
-        public static void DebrisExplode(Vector2 origin, Vector2 direction, int particleCount, float force, float degrees) {
+        public static void DebrisExplode(Vector2 origin, Vector2 direction, int particleCount, float force, float degrees, bool sticky = true) {
-            LaunchParticles(Singleton.StructuralParticlePrefab, origin, direction, particleCount, force, degrees);
+            LaunchParticles(Singleton.StructuralParticlePrefab, origin, direction, particleCount, force, degrees, sticky);
         }
 
-        private static void LaunchParticles(GameObject prefab, Vector2 origin, Vector2 direction, int particleCount, float force, float degrees) {
+        private static void LaunchParticles(GameObject prefab, Vector2 origin, Vector2 direction, int particleCount, float force, float degrees, bool sticky) {
             for (int i = 0; i < (int)(particleCount * Singleton.GetParticleCountMultiplier()); i++) {
                 if (Singleton.ParticleRoot.childCount >= Singleton.MaxParticles) {
                     Destroy(Singleton.ParticleRoot.GetChild((int)(Random.value * Singleton.ParticleRoot.childCount)).gameObject);
@@ -32,6 +32,7 @@ namespace Saltosion.OneWeapon {
                 float Offset = Mathf.Atan2(direction.y, direction.x);
                 float Radians = Offset + Mathf.Pow(Cone * (Random.value - 0.5f) * 2f, 2f) * Mathf.PI * 2.0f;
                 Particle.LaunchForce = new Vector2(Mathf.Cos(Radians), Mathf.Sin(Radians)) * Intensity;
+                Particle.GetsStuck = sticky && Random.value < 0.5;
             }
         }
 

Assets/Scripts/Effects/BloodParticle.cs

@@ -8,16 +8,15 @@ namespace Saltosion.OneWeapon {
 
         public Vector2 LaunchForce = new Vector2();
         public bool Settled = false;
+        public bool GetsStuck = true;
         public Sprite[] Sprites;
 
         private Rigidbody2D CurrentlyStuckOn = null;
         private Vector2 Velocity;
-        private bool GetsStuck;
 
         private void Start() {
             transform.localScale = new Vector2(0.02f, 0.02f) + Random.value * new Vector2(0.10f, 0.10f);
             Velocity = LaunchForce + new Vector2(Random.value - 0.5f, Random.value - 0.5f);
-            GetsStuck = Random.value > 0.5;
             if (Sprites.Length > 0) {
                 Renderer.sprite = Sprites[(int)(Random.value * int.MaxValue) % Sprites.Length];
                 Renderer.flipX = Random.value < 0.5;
@@ -35,6 +34,10 @@ namespace Saltosion.OneWeapon {
                 if (CurrentlyStuckOn != null && GetsStuck) {
                     transform.parent = CurrentlyStuckOn.transform;
                     GetComponentInChildren<SpriteRenderer>().sortingLayerName = "Blood Particles (On characters)";
+                    if (transform.parent.tag == "Player" && Random.value < 0.5) {
+                        // Half of all blood particles are "drippy" so they drip away over time on the floor
+                        gameObject.AddComponent(typeof(BloodDripper));
+                    }
                 }
                 Destroy(GetComponent<BoxCollider2D>());
                 Destroy(this);