cylindertransport.py

from math import sqrt
from PIL import Image, ImageDraw, ImageFont
import argparse, sys

# pfad zu den TTF files (arial.ttf)
FONTBASE = "/usr/share/fonts/truetype/msttcorefonts/"

SPACE_MIN = 10 # minimum offset between bottles

# Durchmesser, Laenge, Volumen und Gewicht der verfuegbaren Tauchflaschen
CYLINDER = {
	"03"	: [100, 515, 3,  4.7],
	"05"	: [140, 466, 5,	 5.7],
	"07"	: [140, 605, 7,  8.8],
	"08"	: [171, 490, 8,  10.4],
	"10"	: [171, 595, 10, 12.4],
	"12S"	: [204, 550, 12, 15.4],
	"12L"	: [171, 690, 12, 14.5],
	"15"	: [204, 640, 15, 18.1],
}

PIPES = [
	["DN8", 13.5],
	["DN10", 17.2],
	["DN15", 21.3],
	["DN20", 26.9],
	["DN25", 33.7],
	["DN32", 42.4],
	["DN40", 48.3],
	["DN50", 60.3],
	["DN65", 76.1],
	["DN80", 88.9],
	["DN100", 114.3],
	["DN125", 139.7],
	["DN150", 168.3],
]


def offset(r1, r2):
	o = (2*sqrt(r1*r2))
	#print "offset %i" % o
	return o

def calc_min(r1, r2):
	# stupider annaehreungsversuch, bis sich die beiden Tauchflaschen r1 und r2 nicht mehr beruehren
	#print "r1=%.0f r2=%.0f" % (r1, r2)
	for p in PIPES:
		i = p[1] / 2
		if i>r1 or i>r2:
			print "spacer radius > r1 or r2, abort"
			return None
		x1 = offset(r1, i)
		x2 = offset(r2, i)
		x = (x1 + x2) - (r1+r2) 
		if x >= SPACE_MIN:
			print "%s Pipe (%.1fmm), Cylinder spacing: %imm" % (p[0], p[1], x)
			return [r1, i, r2, p[0]]
	return None

def circ(draw, x, r, txt = "", txtfactor = 1.0):
	draw.arc([x-r, 0, x + r, 2 * r], 0, 360, 'white')
	if txt != "":
		font = ImageFont.truetype(FONTBASE+"arial.ttf", int(24*txtfactor))
		tox, toy = draw.textsize(txt, font=font)
		draw.text((x-tox/2, r-toy/2), txt, font=font, fill='#ffffff')


def draw_bottles(draw, args):
	bottles = args.cylinders
	SPACE_MIN = args.space_min

	spacerY1 = 200
	spacerY2 = 220
	# first bottle spacer
	r1 = CYLINDER[bottles[0]][0] / 2
	r2 = CYLINDER[bottles[1]][0] / 2
	x = 20 + r1 # start offset x
	r1, r2, r3, dn  = calc_min(r1, r2)
	circ(draw, x, r2, dn, 0.5)
	x = x + offset(r2, r3)

	for i in range(0, len(bottles)-1):
		r1 = CYLINDER[bottles[i]][0] / 2
		r2 = CYLINDER[bottles[i+1]][0] / 2
		r1, r2, r3, dn  = calc_min(r1, r2)
		# draw bottle
		circ(draw, x, r1, "Tank "+bottles[i])
		sx1 = x+r1
		x = x + offset(r1, r2)
		# draw right spacer
		circ(draw, x, r2, dn, 0.5)
		x = x + offset(r2, r3)
		sx2 = x-r3
		if i == (len(bottles)-2):
			# draw last bottle
			circ(draw, x, r3, "Tank "+bottles[i+1])
			x = x + offset(r2, r3)
		# draw the space between bottles
		draw.line((sx1, spacerY1, sx1, spacerY2), fill='#ffffff')
		draw.line((sx2, spacerY1, sx2, spacerY2), fill='#ffffff')
		txt = "%imm" % (sx2-sx1)
		font = ImageFont.truetype(FONTBASE+"arial.ttf", 12)
		tox, toy = draw.textsize(txt, font=font)
		draw.text((sx1+(sx2-sx1)/2-(tox/2), spacerY2+toy/2), txt, font=font, fill='#ffffff')

	# last bottle spacer
	circ(draw, x, r2, dn, 0.5)

def getimage(args):
	image = Image.new('1', (1000, 250)) #create new image, 1000x500 pixels, 1 bit per pixel
	draw = ImageDraw.Draw(image)
	draw_bottles(draw, args)
	return image

if __name__ == "__main__":
	parser = argparse.ArgumentParser(description="Calculate spacer pipes for pressure cylinder transport\n" +
		"Known cylinder types:\n" + ", ".join(sorted(CYLINDER.keys())) )
	parser.add_argument('cylinders', metavar='cylinder', type=str, nargs='+',
                    help='cylinder types')
	parser.add_argument('--space', dest='space_min', type=int,
                    default=SPACE_MIN,
                    help='minimum space between cylinders (mm)')

	args = parser.parse_args()

	for test in args.cylinders:
		if not test in CYLINDER.keys():
			print "Cylinder type '%s' is unknown" % test
			sys.exit(1)

	image = getimage(args)
	image.show()