增加換行功能

app.py

@@ -2,8 +2,10 @@ from fastapi import FastAPI, Request
 from fastapi.staticfiles import StaticFiles
 from pydantic import BaseModel
 from reportlab.pdfgen import canvas
-from reportlab.pdfbase import pdfmetrics
+from reportlab.lib.pagesizes import A4
 from reportlab.pdfbase.ttfonts import TTFont
+from reportlab.pdfbase import pdfmetrics
+from reportlab.pdfbase.pdfmetrics import stringWidth
 import uuid, os
 
 app = FastAPI()
@@ -11,13 +13,7 @@ app = FastAPI()
 os.makedirs("static", exist_ok=True)
 app.mount("/static", StaticFiles(directory="static"), name="static")
 
-# ✅ 註冊中文字體（請確保字體檔案存在）
-font_path = "NotoSansTC-Medium.ttf"  # 或使用微軟系統內建：msjh.ttc（微軟正黑體）
-if os.path.exists(font_path):
-    pdfmetrics.registerFont(TTFont("MyFont", font_path))
-    font_name = "MyFont"
-else:
-    font_name = "Helvetica"  # fallback
+pdfmetrics.registerFont(TTFont("TWFont", "NotoSansTC-Medium.ttf"))
 
 class TextRequest(BaseModel):
     content: str
@@ -27,11 +23,27 @@ def generate_pdf(data: TextRequest, request: Request):
     filename = f"{uuid.uuid4()}.pdf"
     filepath = os.path.join("static", filename)
 
-    c = canvas.Canvas(filepath)
-    c.setFont(font_name, 12)
-    c.drawString(100, 750, data.content[:1000])
+    c = canvas.Canvas(filepath, pagesize=A4)
+    c.setFont("TWFont", 12)
+
+    text_obj = c.beginText(50, 800)
+    text_obj.setFont("TWFont", 12)
+
+    max_line_width = A4[0] - 50 * 2  # 頁寬扣左右邊距
+
+    for line in data.content.splitlines():
+        while stringWidth(line, "TWFont", 12) > max_line_width:
+            for i in range(len(line), 0, -1):
+                if stringWidth(line[:i], "TWFont", 12) <= max_line_width:
+                    text_obj.textLine(line[:i])
+                    line = line[i:]
+                    break
+        text_obj.textLine(line)
+
+    c.drawText(text_obj)
+    c.showPage()
     c.save()
 
     return {
-        "url": str(request.base_url) + f"static/{filename}"
+        "download_url": str(request.base_url.rstrip("/")) + f"/static/{filename}"
     }