utils/ppt_utils.py

from pptx import Presentation
from pptx.util import Inches, Pt
from pptx.enum.text import PP_ALIGN
from pptx.dml.color import RGBColor
import io

def create_ppt(title: str, slides_data: list, template_style: str = "商务") -> bytes:
    """创建PPT"""
    prs = Presentation()

    # 设置模板颜色
    colors = get_template_colors(template_style)

    # 添加标题页
    add_title_slide(prs, title, colors)

    # 添加内容页
    for slide_data in slides_data:
        add_content_slide(prs, slide_data, colors)

    # 保存到内存
    buffer = io.BytesIO()
    prs.save(buffer)
    return buffer.getvalue()

def get_template_colors(style: str) -> dict:
    """获取模板颜色"""
    templates = {
        "商务": {
            "primary": RGBColor(0, 82, 136),      # 深蓝
            "secondary": RGBColor(0, 120, 215),    # 蓝色
            "accent": RGBColor(255, 185, 0),       # 金色
            "text": RGBColor(51, 51, 51),          # 深灰
            "background": RGBColor(255, 255, 255)  # 白色
        },
        "科技": {
            "primary": RGBColor(88, 86, 214),      # 紫色
            "secondary": RGBColor(0, 200, 150),    # 青色
            "accent": RGBColor(255, 100, 100),     # 红色
            "text": RGBColor(30, 30, 30),          # 近黑
            "background": RGBColor(245, 245, 250)  # 浅灰蓝
        },
        "教育": {
            "primary": RGBColor(46, 139, 87),      # 绿色
            "secondary": RGBColor(70, 130, 180),   # 钢蓝
            "accent": RGBColor(255, 165, 0),       # 橙色
            "text": RGBColor(51, 51, 51),          # 深灰
            "background": RGBColor(255, 255, 255)  # 白色
        },
        "简约": {
            "primary": RGBColor(60, 60, 60),       # 深灰
            "secondary": RGBColor(120, 120, 120),  # 中灰
            "accent": RGBColor(200, 50, 50),       # 红色
            "text": RGBColor(51, 51, 51),          # 深灰
            "background": RGBColor(255, 255, 255)  # 白色
        }
    }
    return templates.get(style, templates["商务"])

def add_title_slide(prs, title: str, colors: dict):
    """添加标题页"""
    slide_layout = prs.slide_layouts[0]  # 标题布局
    slide = prs.slides.add_slide(slide_layout)

    # 设置标题
    title_shape = slide.shapes.title
    title_shape.text = title
    title_shape.text_frame.paragraphs[0].alignment = PP_ALIGN.CENTER
    title_shape.text_frame.paragraphs[0].font.size = Pt(44)
    title_shape.text_frame.paragraphs[0].font.color.rgb = colors["primary"]

    # 设置副标题
    if len(slide.placeholders) > 1:
        subtitle = slide.placeholders[1]
        subtitle.text = "自动生成的演示文稿"
        subtitle.text_frame.paragraphs[0].alignment = PP_ALIGN.CENTER
        subtitle.text_frame.paragraphs[0].font.size = Pt(20)
        subtitle.text_frame.paragraphs[0].font.color.rgb = colors["secondary"]

def add_content_slide(prs, slide_data: dict, colors: dict):
    """添加内容页"""
    slide_layout = prs.slide_layouts[1]  # 标题和内容布局
    slide = prs.slides.add_slide(slide_layout)

    # 设置标题
    title_shape = slide.shapes.title
    title_shape.text = slide_data.get("title", "")
    title_shape.text_frame.paragraphs[0].font.size = Pt(32)
    title_shape.text_frame.paragraphs[0].font.color.rgb = colors["primary"]

    # 设置内容
    if len(slide.placeholders) > 1:
        content = slide.placeholders[1]
        content.text = ""

        for point in slide_data.get("content", []):
            p = content.text_frame.add_paragraph()
            p.text = point
            p.font.size = Pt(18)
            p.font.color.rgb = colors["text"]
            p.space_after = Pt(12)
            p.level = 0

    # 添加备注
    if slide_data.get("notes"):
        notes_slide = slide.notes_slide
        notes_slide.notes_text_frame.text = slide_data["notes"]

def create_ppt_from_outline(outline: str, template_style: str = "商务") -> bytes:
    """从大纲文本创建PPT"""
    lines = outline.strip().split('\n')

    title = lines[0] if lines else "演示文稿"
    slides_data = []

    current_slide = None
    for line in lines[1:]:
        line = line.strip()
        if not line:
            continue

        # 判断是否是标题行（以数字开头或以#开头）
        if line[0].isdigit() or line.startswith('#') or line.startswith('**'):
            if current_slide:
                slides_data.append(current_slide)
            # 提取标题文本
            slide_title = line.lstrip('0123456789.#* ').strip()
            current_slide = {"title": slide_title, "content": []}
        elif current_slide:
            # 作为要点添加
            point = line.lstrip('- •* ').strip()
            if point:
                current_slide["content"].append(point)

    if current_slide:
        slides_data.append(current_slide)

    return create_ppt(title, slides_data, template_style)