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