Initial commit

2026-04-27 14:51:49 +08:00
commit dbbfc2867d
69 changed files with 68307 additions and 0 deletions
@@ -0,0 +1,177 @@
+import os
+
+os.environ.setdefault("MPLCONFIGDIR", "/tmp/matplotlib")
+
+import schemdraw
+import schemdraw.elements as elm
+from schemdraw.segments import SegmentText
+
+FONT_NAME = "LXGW WenKai"
+OUTPUT_FILE = "terminal_voltage_diagram.svg"
+
+
+def add_text(
+    drawing,
+    position,
+    text,
+    *,
+    rotation=0,
+    align=("center", "center"),
+    fontsize=18,
+):
+    element = elm.Element().at(position).anchor("center").hold()
+    element.anchors["center"] = (0, 0)
+    element.segments.append(
+        SegmentText(
+            (0, 0),
+            text,
+            rotation=rotation,
+            align=align,
+            fontsize=fontsize,
+            font=FONT_NAME,
+        )
+    )
+    drawing.add(element)
+
+
+with schemdraw.Drawing(show=False) as d:
+    d.config(
+        unit=1.0,
+        fontsize=18,
+        font=FONT_NAME,
+        lw=2.0,
+        margin=0.18,
+        bgcolor="white",
+    )
+
+    # ===== 几何参数 =====
+    left_x = 1.5
+    top_y = 6.3
+    bottom_y = 2.1
+
+    node_x = 6.1
+    term_x = 8.45
+
+    # 电池位置
+    battery_x = left_x
+    battery_bottom_y = 3.55
+    battery_len = 1.55
+
+    # 电阻尺寸控制
+    top_res_start_x = 3.0
+    top_res_len = 2.2
+
+    vertical_res_len = 2.25
+
+    # 关键点
+    top_node = (node_x, top_y)
+    bottom_node = (node_x, bottom_y)
+    a_pos = (term_x, top_y)
+    b_pos = (term_x, bottom_y)
+
+    top_battery_end_y = battery_bottom_y + battery_len
+
+    # ===== 左支路 + 电池 =====
+    # 下导线到电池
+    d.add(
+        elm.Line()
+        .at((battery_x, bottom_y))
+        .up(battery_bottom_y - bottom_y)
+        .hold()
+    )
+
+    # 电池
+    d.add(
+        elm.BatteryCell()
+        .at((battery_x, battery_bottom_y))
+        .up(battery_len)
+        .hold()
+    )
+
+    # 电池上端到顶端导线
+    d.add(
+        elm.Line()
+        .at((battery_x, top_battery_end_y))
+        .up(top_y - top_battery_end_y)
+        .hold()
+    )
+
+    # ===== 上支路 =====
+    d.add(elm.Line().at((battery_x, top_y)).right(top_res_start_x - battery_x).hold())
+    d.add(elm.ResistorIEC().at((top_res_start_x, top_y)).right(top_res_len).hold())
+    d.add(
+        elm.Line()
+        .at((top_res_start_x + top_res_len, top_y))
+        .right(node_x - (top_res_start_x + top_res_len))
+        .hold()
+    )
+
+    # 上节点
+    d.add(elm.Dot(radius=0.085).at(top_node).hold())
+
+    # a 端
+    d.add(elm.Line().at(top_node).right(term_x - node_x).hold())
+    d.add(elm.Dot(open=True, radius=0.105).at(a_pos).hold())
+
+    # ===== 中间竖支路 =====
+    d.add(elm.ResistorIEC().at(top_node).down(vertical_res_len).hold())
+    d.add(
+        elm.Line()
+        .at((node_x, top_y - vertical_res_len))
+        .down((top_y - vertical_res_len) - bottom_y)
+        .hold()
+    )
+
+    # 下节点
+    d.add(elm.Dot(radius=0.085).at(bottom_node).hold())
+
+    # b 端
+    d.add(elm.Line().at(bottom_node).right(term_x - node_x).hold())
+    d.add(elm.Dot(open=True, radius=0.105).at(b_pos).hold())
+
+    # ===== 下支路闭合 =====
+    d.add(elm.Line().at((battery_x, bottom_y)).right(node_x - battery_x).hold())
+
+    # ===== 文本标注 =====
+    # 9V：竖排，放在电池右侧偏中间，更贴近教材风格
+    add_text(
+        d,
+        (battery_x + 0.92, battery_bottom_y + battery_len / 2),
+        "10V",
+        rotation=0,
+        fontsize=16,
+    )
+
+    # 1kΩ：水平，置于上方电阻正下方
+    add_text(
+        d,
+        (top_res_start_x + top_res_len / 2, top_y - 0.72),
+        "1kΩ",
+        rotation=0,
+        fontsize=16,
+    )
+
+    # 2kΩ：竖排，置于竖直电阻左侧，方向要注意
+    add_text(
+        d,
+        (node_x - 0.82, top_y - vertical_res_len / 2),
+        "2kΩ",
+        rotation=0,
+        fontsize=16,
+    )
+
+    # a / b 端标注
+    add_text(
+        d,
+        (a_pos[0] + 0.42, a_pos[1] - 0.02),
+        "a",
+        fontsize=19,
+    )
+    add_text(
+        d,
+        (b_pos[0] + 0.42, b_pos[1] - 0.02),
+        "b",
+        fontsize=19,
+    )
+
+    d.save(OUTPUT_FILE, transparent=False)