From 54aa20d7c5c98d35b677f193ea51b166144b9038 Mon Sep 17 00:00:00 2001
From: Ying-Li Niu <64801511@qq.com>
Date: Fri, 12 Jun 2026 07:24:38 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20display.txt=20=E7=BC=BA=E5=A4=B1=20alpha?=
 =?UTF-8?q?=20=E9=80=8F=E6=98=8E=E5=BA=A6=E5=8F=82=E6=95=B0=EF=BC=8Cdraw.p?=
 =?UTF-8?q?y=20=E8=AF=BB=E5=8F=96=E4=B8=8D=E5=88=B0?=
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alpha（盒子透明度）未写入 display.txt header，
draw.py 回退到默认 0.2 而非 input.txt 配置值。
现在 alpha 通过 header 字段正确传递。

Python 引擎：alpha 支持单值或数组 → 逗号分隔字符串
外部引擎：从 trajectory.txt 读取 alpha 值
---
 compute.py                      | 3 ++-
 draw.py                         | 2 +-
 dynamics.py                     | 3 ++-
 examples/case06/input/input.txt | 2 +-
 4 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/compute.py b/compute.py
index 16e9811..6fbb319 100644
--- a/compute.py
+++ b/compute.py
@@ -1459,7 +1459,8 @@ def run_simulation(save_trajectory=0):
                        "damping_force": str(DAMPING_FORCE),
                        "gravity_strength": str(GRAVITY_STRENGTH),
                        "driving_force": str(DRIVING_FORCE),
-                       "use_marker": str(use_marker)}
+                       "use_marker": str(use_marker),
+                       "alpha": ",".join(str(a) for a in (alpha if isinstance(alpha, list) else [alpha]))}
     )
     print(f"[compute] display.txt 已保存至: {disp_path} ({n_frames_actual} 帧)")
 
diff --git a/draw.py b/draw.py
index 76a7ad8..3c48389 100644
--- a/draw.py
+++ b/draw.py
@@ -105,7 +105,7 @@ box_color_b = float(h.get("box_color_b", 0.85))
 # 图形界面无关的几何参数（不参与物理计算，仅用于场景外观）
 # ===========================================================================
 
-info_margin  = 36
+info_margin  = 8
 axis_length  = 10.0
 
 initial_camera = {
diff --git a/dynamics.py b/dynamics.py
index 1df4c03..c3740d2 100644
--- a/dynamics.py
+++ b/dynamics.py
@@ -245,7 +245,8 @@ def run_case(config_path, runtime_base, input_dir="input", output_dir="output",
                   "damping_force": str(data.get("damping_force", 0)),
                   "gravity_strength": str(data.get("gravity_strength", 1.0)),
                   "driving_force": str(data.get("driving_force", 0)),
-                  "use_marker": str(config.get("use_marker", 0))}
+                  "use_marker": str(config.get("use_marker", 0)),
+                  "alpha": str(data.get("alpha", 0.2))}
             
             n_frames = len(indices)
             compute.save_display_txt(
diff --git a/examples/case06/input/input.txt b/examples/case06/input/input.txt
index 041513b..cef3232 100644
--- a/examples/case06/input/input.txt
+++ b/examples/case06/input/input.txt
@@ -88,7 +88,7 @@ use_marker: 1
 
 # ── 显示参数 ──────────────────────────────────
 # 盒子透明度：单个数值（统一）或 6 个数的数组，按 [-x,+x,-y,+y,-z,+z] 顺序
-alpha: [0.0, 0.0, 0.0, 0.0, 0.0, 0.5]
+alpha: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
 
 # 小球颜色
 # 小球半径从 coord_file 的 radius 列读取