建立方向盘项目初始版本

scripts/render_pcd50_print_plate_preview.py

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+"""Render a 2D overview of the generated STL plate using Pillow.
+
+The preview is only a placement guide; the STL is the printing artifact.
+"""
+from pathlib import Path
+import json, struct
+from PIL import Image, ImageDraw, ImageFont, ImageChops, ImageFilter
+
+root=Path(__file__).resolve().parent.parent
+out=root/'models'/'pcd50_print_plate'
+source=root/'models'/'pcd50_open_pillar_v1'
+info=json.loads((out/'布局检查.json').read_text(encoding='utf-8'))
+
+canvas=Image.new('RGB',(1220,1060),'#f7f9fc')
+d=ImageDraw.Draw(canvas)
+font_path='C:/Windows/Fonts/msyh.ttc'
+title=ImageFont.truetype(font_path,42)
+font=ImageFont.truetype(font_path,25)
+small=ImageFont.truetype(font_path,21)
+d.text((70,38),'一盘打印：支架 + 4 个 0.5 mm 垫片',font=title,fill='#1a2942')
+d.text((70,104),'俯视排版 · 模型保持原尺寸 · 单位：mm',font=font,fill='#52627b')
+
+scale=10.0; ox=250; oy=900
+def xy(x,y): return (round(ox+x*scale),round(oy-y*scale))
+def triangle_vertices(path):
+    data=path.read_bytes()
+    count=struct.unpack_from('<I',data,80)[0]
+    if len(data)!=84+50*count:raise ValueError('Invalid binary STL')
+    return [((t[3],t[4],t[5]),(t[6],t[7],t[8]),(t[9],t[10],t[11]))
+            for t in struct.iter_unpack('<12fH',data[84:])]
+
+def show_part(path, target_bounds, fill):
+    tris=triangle_vertices(path)
+    source_x=min(v[0] for tri in tris for v in tri)
+    source_y=min(v[1] for tri in tris for v in tri)
+    dx,dy=target_bounds[0]-source_x,target_bounds[2]-source_y
+    mask=Image.new('L',canvas.size,0);md=ImageDraw.Draw(mask)
+    for tri in tris:
+        md.polygon([xy(v[0]+dx,v[1]+dy) for v in tri],fill=255)
+    ink=Image.new('RGB',canvas.size,fill);canvas.paste(ink,(0,0),mask)
+    edge=ImageChops.subtract(mask,mask.filter(ImageFilter.MinFilter(5)))
+    canvas.paste(Image.new('RGB',canvas.size,'#20314b'),(0,0),edge)
+
+# Plate bounds reflect model footprint, not an assumed printer bed.
+d.rounded_rectangle([215,oy-725,ox+755,oy+35],radius=12,fill='#ffffff',outline='#c3cfdf',width=3)
+for ob in info['main']['objects']:
+    part='EncoderBracket.stl' if ob['name']=='Bracket' else 'Shim05.stl'
+    show_part(source/part,ob['bounds_mm'],'#3c6fba' if ob['name']=='Bracket' else '#e3a53e')
+d=ImageDraw.Draw(canvas)
+d.text((270,185),'支架 × 1',font=font,fill='#214b87')
+d.text((270,922),'0.5 mm 垫片 × 4',font=font,fill='#8a5600')
+d.text((70,1000),'模型约 71.6 × 69.0 mm，件间净距至少 8.0 mm',font=small,fill='#52627b')
+canvas.save(out/'打印排版预览.png')