#!/usr/bin/env python
# Code modified from the original WRITINGPAPER.PY by Trevor Keller 
	# Source of original code is http://www.carcosa.net/jason/software/utilities/writingpaper/
	# Original author's comments:
	# Programatically generate writing paper with guidelines for italic handwriting. Copyright (C) 2007, Jason F. McBrayer <jmcbray@carcosa.net>
	# This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version.
	#
	# You can choose the paper size, line height, x-height, output file name, and
	# page orientation by setting the parameters near the beginning of the
	# file.
	#
	# This program requires reportlab (http://www.reportlab.org/) for Python.
	# 
# This modified code generates guidelines for copperplate handrwiting.
# Slope, waistline, t-line, and ascender line dimensions found on The Fountain Pen Network:
#	http://www.fountainpennetwork.com/forum/index.php?/topic/43421-copperplate-guidelines-for-download/
#	http://www.fountainpennetwork.com/forum/index.php?/topic/46264-there-is-tremendous-gratification/
#
# Imports
from reportlab.pdfgen.canvas import Canvas
from reportlab.lib.styles import getSampleStyleSheet
from reportlab.platypus import *
from reportlab.lib.pagesizes import letter, A4, landscape, portrait
from reportlab.lib.units import cm, mm, inch, pica
from reportlab.lib import colors

# Parameters
OUTPUTFILE = "copperplatepaper.pdf"
PAGESIZE = (8.5 * 72, 11 * 72) # x, y in dots: 72 × dimensions in inches
GUIDEGRID = 0 # turn sub-grid for letter shapes on & off. On = 1
# PAGESIZE = letter
# --- ascender: 	 0.00   mm
# - - t ascender:       -0.85 x mm
# === waistline: 	-1.50 x mm
#
# === baseline: 	-2.50 x mm
#
# --- descender: 	-4.00 x mm
XHEIGHT = 3.75 # mm
# angle = 54 degrees --> tan 35 = 0.7
# Convert x-height from mm to 72nds of an inch
XHEIGHT *= 72/25.4
ORIENTATION = portrait
LEFTMARGIN = True
GUIDETHICKNESS_MAIN = 0.50
GUIDETHICKNESS_SMALL = 0.25
THKBENCH = 0.1

def main():
    LINEHEIGHT = 4 * XHEIGHT
    currpos = PAGESIZE[1] - 36 # top of page - 0.5" border
    pdf = Canvas(OUTPUTFILE, pagesize = ORIENTATION(PAGESIZE))
    pdf.setFillGray(1)
    pdf.setLineWidth(GUIDETHICKNESS_MAIN)
    while currpos > LINEHEIGHT: # Loop until we reach one line from bottom of page
        # Draw horizontal guidelines
        if GUIDEGRID > 0:
            pdf.setLineWidth(GUIDETHICKNESS_SMALL)
            pdf.setStrokeGray(1 - THKBENCH - 0.05)			
            for i in range(1,16):			
                pdf.line( 36, currpos - 0.25 * i * XHEIGHT, PAGESIZE[0]-36, currpos - 0.25 * i * XHEIGHT)    # guideline
        # Draw slanted guidelines
        if LEFTMARGIN:
            LINEPOS = 36+ 1.5 * XHEIGHT
            pdf.setLineWidth(GUIDETHICKNESS_SMALL)			
            while LINEPOS < PAGESIZE[0] - 37 - (2 * 1.2208 * XHEIGHT):
                pdf.setStrokeGray(1 - THKBENCH - 0.10)
                pdf.line( LINEPOS, currpos - 4 * XHEIGHT + GUIDETHICKNESS_SMALL / 3, LINEPOS + 4 * 0.7 * XHEIGHT, currpos - GUIDETHICKNESS_SMALL / 3 )
                if GUIDEGRID > 0:
                    for i in range (1,3):
                        pdf.line( LINEPOS, currpos - 4 * XHEIGHT + GUIDETHICKNESS_SMALL / 3, LINEPOS + 4 * 0.7 * XHEIGHT, currpos - GUIDETHICKNESS_SMALL / 3 )
                        LINEPOS += 0.3052 * XHEIGHT
                else:
                        LINEPOS += 1.2208 * XHEIGHT
					
        # Draw full ascender line
        pdf.setLineWidth(GUIDETHICKNESS_SMALL) 
        pdf.setStrokeGray(1 - THKBENCH - 0.15)
        pdf.line( 36, currpos, PAGESIZE[0]-36, currpos)

        # Draw mid ascender line, descender line, waistline, and baseline 	
        pdf.setStrokeGray(1 - THKBENCH - 0.10)
        pdf.setLineWidth(GUIDETHICKNESS_SMALL)        
        pdf.line( 36, currpos - 0.75 * XHEIGHT, PAGESIZE[0]-36, currpos - 0.75 * XHEIGHT)    # short ascender
        pdf.line( 36, currpos - 4.00 * XHEIGHT, PAGESIZE[0]-36, currpos - 4.00 * XHEIGHT)    # descender	
        pdf.setStrokeGray(1 - THKBENCH - 0.15)
        pdf.setLineWidth(GUIDETHICKNESS_MAIN) 		
        pdf.line( 36, currpos - 1.50 * XHEIGHT, PAGESIZE[0]-36, currpos - 1.50 * XHEIGHT)    # waist line
        pdf.line(36+XHEIGHT, currpos - 1.50 * XHEIGHT, 36+XHEIGHT, currpos - 2.50 * XHEIGHT)   # x-height line
        pdf.line(36+ 0.25 * XHEIGHT, currpos - 1.75 * XHEIGHT, 36+0.75 * XHEIGHT, currpos - 2.25 * XHEIGHT)   # x-height line
        pdf.line(36+0.25 * XHEIGHT, currpos - 2.25 * XHEIGHT, 36+0.75 * XHEIGHT, currpos - 1.75 * XHEIGHT)   # x-height line
        pdf.line(36, currpos - 1.50 * XHEIGHT, 36, currpos - 2.50 * XHEIGHT)   # x-height line
        pdf.line( 36, currpos - 2.50 * XHEIGHT, PAGESIZE[0]-36, currpos - 2.50 * XHEIGHT)    # base line
		# Next row
        currpos -= 4 * XHEIGHT

    # close up.
    pdf.showPage()
    pdf.save()

if __name__ == "__main__":
    main()