from fontTools.pens.transformPen import TransformPen
from fontTools.ttLib import TTFont
from fontTools.pens.recordingPen import RecordingPen
from fontTools.pens.ttGlyphPen import TTGlyphPen

def change_glyph(font_path, glyph_name, new_glyph_path):
    # 加載字體文件
    font = TTFont(font_path)
    
    # 獲取 glyf 表
    glyf_table = font['glyf']
    
    # 確保字形存在
    if glyph_name in glyf_table.glyphs:
        # 記錄原始輪廓（可選，用于對比）
        recording_pen = RecordingPen()
        glyf_table[glyph_name].draw(recording_pen, font)
        
        # 創(chuàng)建新輪廓
        new_glyph_pen = TTGlyphPen(font.getGlyphSet())
        # 定義新輪廓（此處為一個簡單的矩形）
        new_glyph_pen.moveTo((100, 100))
        new_glyph_pen.lineTo((200, 100))
        new_glyph_pen.lineTo((200, 200))
        new_glyph_pen.lineTo((100, 200))
        new_glyph_pen.closePath()
        
        # 替換字形
        glyf_table[glyph_name] = new_glyph_pen.glyph()
        
        # 保存修改后的字體
        font.save(new_glyph_path)
    else:
        print(f"字形 '{glyph_name}' 不存在！")

def extract_all_glyph_vector_data(font_path, output_file):
    font = TTFont(font_path)
    cmap = font.getBestCmap()  # 字符編碼到字形名的映射
    glyph_set = font.getGlyphSet()
    file_content = ""
    
    for char_code, glyph_name in cmap.items():
        glyph = glyph_set[glyph_name]
        pen = RecordingPen()
        transform_pen = TransformPen(pen, (1, 0, 0, 1, 0, 0))  # 無變換
        glyph.draw(transform_pen)
        
        # 格式化輸出
        character = chr(char_code) if char_code <= 0x10FFFF else f"U+{char_code:04X}"
        data = f"Character: {character} (U+{char_code:04X})\nVector Data: {pen.value}\n\n"
        file_content += data
    
    # 保存到文件
    with open(output_file, "w", encoding="utf-8") as f:
        f.write(file_content)

Character: A (U+0041)
Vector Data:
MoveTo((100, 200))
LineTo((300, 200))
LineTo((200, 400))
ClosePath()

# 修改字體中的"A"字形
change_glyph(
    font_path="simsun.ttf",      # 輸入字體路徑
    glyph_name="A",              # 目標(biāo)字形名稱
    new_glyph_path="modified.ttf" # 輸出路徑
)

# 提取所有字形數(shù)據(jù)
extract_all_glyph_vector_data(
    font_path="simsun.ttf", 
    output_file="simsun_vectors.txt"
)

python -m fontTools.validate modified.ttf

# 縮放字形為原尺寸的50%
scale = 0.5
transform = (scale, 0, 0, scale, 0, 0)
transform_pen = TransformPen(pen, transform)

import matplotlib.pyplot as plt

def plot_glyph(glyph):
    pen = PathPen(glyph)
    glyph.draw(pen)
    path = pen.path
    for element in path:
        vertices = element.vertices
        codes = element.codes
        plt.plot(vertices[:,0], vertices[:,1], marker='o')
    plt.show()