from PIL import Image, ImageDraw, ImageFont
from pathlib import Path
p=Path(r'C:\projects\wheel\models\switch_2020_crossbar132')
im=Image.new('RGB',(2000,1250),'white');d=ImageDraw.Draw(im)
font=ImageFont.truetype(r'C:\Windows\Fonts\msyh.ttc',42); sub=ImageFont.truetype(r'C:\Windows\Fonts\msyh.ttc',26)
d.text((35,20),'灯光开关 2020 横梁：132 mm 下料方案',font=font,fill='#162c44')
d.text((35,88),'横梁置于两根 3030 纵梁上方；两端各突出约 0.38 mm',font=sub,fill='#415a70')
def paste(source,rect):
 pic=Image.open(p/source).convert('RGB');bg=Image.new('RGB',pic.size,'white');diff=__import__('PIL.ImageChops',fromlist=['difference']).difference(pic,bg);box=diff.getbbox();pic=pic.crop(box) if box else pic
 x0,y0,x1,y1=rect;pic.thumbnail((x1-x0,y1-y0),Image.Resampling.LANCZOS);im.paste(pic,(x0+(x1-x0-pic.width)//2,y0+(y1-y0-pic.height)//2))
paste('assembly.png',(30,175,1000,1120));paste('crossbar_front.png',(1020,240,1980,1030))
d.text((90,130),'整体装配（转向灯为绿色示意包络）',font=sub,fill='#344d62');d.text((1110,180),'开关横梁正视图',font=sub,fill='#344d62')
d.text((80,1150),'注：灯光开关为示意包络；真实安装孔位置、槽型及滑块须在装配时核对。',font=sub,fill='#8a4141')
im.save(p/'132mm横梁_3D装配示意.png')