From a59110067e352d300a8b1dee2d00b1daa9a1492e Mon Sep 17 00:00:00 2001
From: spatialfree <mail@ethanmerchant.com>
Date: Fri, 8 Nov 2024 22:01:21 -0500
Subject: [PATCH] smooth snake

---
 src/Arts.cs | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/src/Arts.cs b/src/Arts.cs
index c0d7416..bc06113 100644
--- a/src/Arts.cs
+++ b/src/Arts.cs
@@ -76,6 +76,7 @@ static class Arts
         }
 
         // snake
+        float snake_t = Maths.smooth_stop((float)Mono.step_t);
         bool food_next = (Mono.snake[0] + Mono.snake_dir) == Mono.food;
         if (!food_next)
         {
@@ -93,13 +94,13 @@ static class Arts
         meshes[face].Draw(
             mat_mono,
             Matrix.TRS(
-                Mono.snake[0].ToVec3 + fall,
+                Mono.snake[0].ToVec3 - (Mono.snake_dir.ToVec3 * (float)(1.0 - snake_t) * 0.3f),
                 Quat.LookDir(Mono.snake_dir.ToVec3),
-                V.XYZ(1, 1, 1)//  * (float)(Mono.step_t))
+                V.XYZ(1, 1, (float)(snake_t))
             )
         );
 
-        for (int i = 1; i < Mono.snake_len; i++)
+        for (int i = 1; i < Mono.snake_len - 1; i++)
         {
             float scale = 1.0f;
             if ((int)((Time.Total - Mono.eat_timestamp) * Mono.snake_len / Mono.step_step) == i)
@@ -109,12 +110,24 @@ static class Arts
             meshes["Segment"].Draw(
                 mat_mono,
                 Matrix.TRS(
-                    Mono.snake[i].ToVec3 + fall,
+                    Mono.snake[i].ToVec3,
                     Quat.LookAt(Mono.snake[i].ToVec3, Mono.snake[i - 1].ToVec3),
                     scale
                 )
             );
         }
+        // tail
+        if (Mono.grow_buffer > 0) { snake_t = 0.0f; }
+        int i_tail = Mono.snake_len - 1;
+        Vec3 tail_dir = Vec3.Direction(Mono.snake[i_tail - 1].ToVec3, Mono.snake[i_tail].ToVec3);
+        meshes["Segment"].Draw(
+            mat_mono,
+            Matrix.TRS(
+                Mono.snake[i_tail].ToVec3 + (tail_dir * (float)(snake_t) * 0.7f),
+                Quat.LookDir(tail_dir),
+                V.XYZ(1, 1, (float)(1.0 - snake_t))
+            )
+        );
 
         // holes
         foreach (KeyValuePair<XYZi, XYZi> hole in Mono.holes)