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