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chore: fork from IRIS track 供 LICA 部门独立运行

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- 复制来源: /home/yueli/track @ 192c8ee (feature/ai-audit-update)
- 组织隔离目标: LICA
- 端口规划: 前端 8030 / 后端 8031 / 数据库 8032
- 已排除 deploy.sh、deploy_full.sh、docker-compose.prod.yml（IRIS 生产发布脚本）
- 已排除工作区未提交改动，取干净的 192c8ee 状态
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duxingchen
2026-09-21 15:56:52 +08:00
commit 3286a11bc7
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backend/app/services/label_service.py Normal file
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"""标签打印服务 — 工业级精确定位标签 (480×360) + TSPL 发送"""
import base64
import socket
from io import BytesIO
from pathlib import Path
from typing import Optional
import qrcode
from PIL import Image, ImageDraw, ImageFont
from app.services.print_config import PrintConfigManager
# ============================================================
# 字体 — 项目内 simhei.ttf
# ============================================================
_FONT_PATH = str(Path(__file__).resolve().parent.parent.parent / "simhei.ttf")
FONT_NORMAL = ImageFont.truetype(_FONT_PATH, 28) # 右侧：名/规/单
FONT_LARGE = ImageFont.truetype(_FONT_PATH, 34) # 底部：序列号
# ============================================================
# 画布 & 坐标常量
# ============================================================
WIDTH, HEIGHT = 480, 360
QR_X, QR_Y = 24, 60
QR_SIZE = 180
TEXT_X = 228
TEXT_MAX_W = WIDTH - TEXT_X - 12 # ~240px
BOTTOM_Y = 260 # 序列号 y
LINE_H = 44 # 28px 行高
# ============================================================
# QR 码
# ============================================================
def _generate_qr(content: str) -> Image.Image:
qr = qrcode.QRCode(
version=1,
error_correction=qrcode.constants.ERROR_CORRECT_M,
box_size=10,
border=2,
)
qr.add_data(content)
qr.make(fit=True)
img = qr.make_image(fill_color="black", back_color="white")
return img.resize((QR_SIZE, QR_SIZE), Image.NEAREST)
# ============================================================
# 文字绘制 — 带描边 + 自动换行
# ============================================================
def _draw(
draw: ImageDraw.Draw,
text: str,
x: int,
y: int,
font: ImageFont.FreeTypeFont,
max_width: int,
stroke_width: int = 1,
) -> int:
"""
绘制文字，超出 max_width 自动折行。
返回下一行可用的 y 坐标。
"""
if not text:
return y + LINE_H
# 单行不超宽 → 直接画（带描边）
bbox = draw.textbbox((0, 0), text, font=font)
if bbox[2] - bbox[0] <= max_width:
draw.text((x, y), text, font=font, fill="black",
stroke_width=stroke_width, stroke_fill="black")
return y + LINE_H
# 逐字符折行
lines: list[str] = []
current = ""
for char in text:
test = current + char
w = draw.textbbox((0, 0), test, font=font)[2]
if w <= max_width:
current = test
else:
lines.append(current)
current = char
if current:
lines.append(current)
cy = y
for line in lines:
draw.text((x, cy), line, font=font, fill="black",
stroke_width=stroke_width, stroke_fill="black")
cy += LINE_H
return cy
# ============================================================
# 标签绑制 — 工业级精确坐标
# ============================================================
def _create_label(data: dict) -> Image.Image:
"""
480×360 工业级排版：
┌───────────────┬──────────────────────────────┐
│ │ 名: 样品升降台V1J y=60 │ ← 28px sw=1
│ [QR Code] │ 规: PH-B4V1J/类A y=104 │
│ 180×180 │ 单: ORD-2024-001 y=148 │
│ (24, 60) │ │
│ │ │
│ 码: 0000000000000001 y=260 │ ← 34px sw=2
└───────────────┴──────────────────────────────┘
"""
img = Image.new("RGB", (WIDTH, HEIGHT), color="white")
draw = ImageDraw.Draw(img)
serial = data.get("serial_number", "")
# ── QR 码 (24, 60) ──
if serial:
qr_img = _generate_qr(serial)
img.paste(qr_img, (QR_X, QR_Y))
# ── 右侧文字 x=228 — 28px, stroke_width=1 ──
y = 60
name = data.get("material_name", "") or "未命名"
y = _draw(draw, f"名: {name}", TEXT_X, y, FONT_NORMAL, TEXT_MAX_W, stroke_width=1)
spec = data.get("spec_model", "") or "-"
y = _draw(draw, f"规: {spec}", TEXT_X, y, FONT_NORMAL, TEXT_MAX_W, stroke_width=1)
order_no = data.get("order_no", "")
if order_no and str(order_no).strip():
y = _draw(draw, f"单: {str(order_no).strip()}", TEXT_X, y, FONT_NORMAL, TEXT_MAX_W, stroke_width=1)
# ── 底部通栏 (24, 260) — 34px, stroke_width=2 ──
code = serial or "-"
draw.text((24, BOTTOM_Y), f"码: {code}", font=FONT_LARGE, fill="black",
stroke_width=2, stroke_fill="black")
return img
# ============================================================
# 公开 API
# ============================================================
def generate_preview_image(**data) -> str:
"""返回 Base64 JPEG data URL"""
img = _create_label(data)
buf = BytesIO()
img.save(buf, format="JPEG", quality=92)
b64 = base64.b64encode(buf.getvalue()).decode()
return f"data:image/jpeg;base64,{b64}"
def send_to_printer(
copies: int = 1,
printer_ip: Optional[str] = None,
printer_port: Optional[int] = None,
**data,
) -> dict:
"""二值化 → TSPL → Socket 发送"""
printer = PrintConfigManager.get_printer("label_printer")
ip = printer_ip or printer.get("ip", "192.168.9.221")
port = printer_port or printer.get("port", 9100)
img_rgb = _create_label(data)
img_gray = img_rgb.convert("L")
img_bw = img_gray.point(lambda px: 0 if px < 128 else 255, "1")
width_bytes = (img_bw.width + 7) // 8
height_dots = img_bw.height
tspl = (
"SIZE 40 mm, 30 mm\r\n"
"GAP 2 mm, 0 mm\r\n"
"CLS\r\n"
"DIRECTION 1\r\n"
).encode("gbk", errors="replace")
bitmap_cmd = f"BITMAP 0,0,{width_bytes},{height_dots},0,".encode("gbk", errors="replace")
bitmap_data = img_bw.tobytes()
footer = f"\r\nPRINT 1,{copies}\r\n".encode("gbk", errors="replace")
payload = tspl + bitmap_cmd + bitmap_data + footer
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(5)
try:
s.connect((ip, port))
s.sendall(payload)
s.close()
return {
"success": True,
"message": f"打印指令已发送 → {ip}:{port}，份数: {copies}",
"printer": f"{ip}:{port}",
}
except Exception as e:
return {
"success": False,
"message": f"打印机连接失败 ({ip}:{port}): {str(e)}",
"printer": f"{ip}:{port}",
}