纸拍尺

今天看到别人家产品拍照时下面垫的网格纸心动了，但是在网上搜了搜却发现这个东西很小众，没找到现成现的，有的卖的说要定制，有的配色不好看，遂决定自己做一个。

1.jpg

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# -*- coding: utf-8 -*-

from PIL import Image
from PIL import ImageDraw
from PIL import Image, ImageDraw, ImageFont
import os
outputfile="ruler.pdf"

#72像素/英寸    72像素=2.54cm 

dpi_scale=5# 1:A4 at 72dpi
print_scale=25.0/22.7
weight=595*dpi_scale
height=842*dpi_scale
PixelPermm=int(72*dpi_scale/2.54/10*print_scale)


img = Image.new('RGB',
                 (weight,height),   
                 (255, 255, 255))  # White

img_d = ImageDraw.Draw(img)


# # 生成格网
x_len, y_len = img.size
x_step = PixelPermm
y_step = PixelPermm
print(x_len)
print(y_len)

edge_lineToMarginleft=15*PixelPermm
edge_lineToMarginright=15*PixelPermm
edge_lineToMargintop=15*PixelPermm
edge_lineToMarginbottom=15*PixelPermm



edge_lineHeadToMargin_ver=12*PixelPermm
edge_lineHeadToMargin_hor=12*PixelPermm


font = ImageFont.truetype('LiberationSans-Regular.ttf', 2*PixelPermm)
font_cm = ImageFont.truetype('LiberationSans-Regular.ttf', 1*PixelPermm)

color_margin=(71,89,201)
color_text=(0,0,0)
color_bigline=(255,0,0)
color_line=(0,0,0)

img_d.rectangle([0,0,weight,height] , fill =None, outline =color_margin,width =8*PixelPermm) 

i=0
for x in range(edge_lineToMarginleft, x_len-edge_lineToMarginright, x_step):
    if (i % 10 ==0) :
        img_d.line(((x, edge_lineHeadToMargin_ver), (x, y_len-edge_lineHeadToMargin_ver)), color_bigline,width=3)
        img_d.text((x, y_len-edge_lineHeadToMargin_hor+0.3*PixelPermm), str(i/10),font=font, fill=color_text)
        img_d.text((x+1*len(str(i/10))*PixelPermm, y_len-edge_lineHeadToMargin_hor+1*PixelPermm), " cm",font=font_cm, fill=color_text)


    else:
        img_d.line(((x, edge_lineHeadToMargin_ver), (x, y_len-edge_lineHeadToMargin_ver)), color_line,width=2)
    i=i+1



img = img.rotate(90, expand=True)
img_d = ImageDraw.Draw(img)



i=0
for y in range( y_len-edge_lineToMarginbottom,edge_lineToMargintop, -y_step):
    if (i % 10 ==0) :
        img_d.line(((y, edge_lineHeadToMargin_hor), (y, x_len-edge_lineHeadToMargin_hor)), color_bigline,width=3)
        img_d.text((y, x_len-edge_lineHeadToMargin_ver+0.3*PixelPermm), str(i/10),font=font, fill=color_text)
        img_d.text((y+1*len(str(i/10))*PixelPermm, x_len-edge_lineHeadToMargin_ver+1*PixelPermm), " cm",font=font_cm, fill=color_text)


    else:
        img_d.line(((y, edge_lineHeadToMargin_hor), (y, x_len-edge_lineHeadToMargin_hor)), color_line,width=2)
    i=i+1
    print(i)
img = img.rotate(-90, expand=True)

img.save(outputfile, 'PDF', quality=100)

运行后会产生一个 pdf，将其打印到 A4 纸后，由于打印的缩放，刻度可能不太准确 ，用尺子测量后修改print_scale，校正每 mm 的像素点个数即可。