boxespy/boxes/__init__.py

#!/usr/bin/python3
# Copyright (C) 2013-2014 Florian Festi
#
#   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 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.

import cairo
import math
import argparse
from argparse import ArgumentParser
import re
from functools import wraps
from boxes import edges

def dist(dx, dy):
    return (dx*dx+dy*dy)**0.5

def restore(func):
    @wraps(func)
    def f(self, *args, **kw):
        self.ctx.save()
        pt = self.ctx.get_current_point()
        func(self, *args, **kw)
        self.ctx.restore()
        self.ctx.move_to(*pt)
    return f


#############################################################################
### Building blocks
#############################################################################

class NutHole:
    sizes = {
        "M1.6" : (3.2, 1.3),
        "M2" : (4, 1.6),
        "M2.5" : (5, 2.0),
        "M3" : (5.5, 2.4),
        "M4" : (7, 3.2),
        "M5" : (8, 4.7),
        "M6" : (10, 5.2),
        "M8" : (13, 6.8),
        "M10" : (16, 8.4),
        "M12" : (18, 10.8),
        "M14" : (21, 12.8),
        "M16" : (24, 14.8),
        "M20" : (30, 18.0),
        "M24" : (36, 21.5),
        "M30" : (46, 25.6),
        "M36" : (55, 31),
        "M42" : (65, 34),
        "M48" : (75, 38),
        "M56" : (85, 45),
        "M64" : (95, 51),
        }

    def __init__(self, boxes, settings):
        self.boxes = boxes
        self.ctx = boxes.ctx
        self.settings = settings

    @restore
    def __call__(self, size, x=0, y=0, angle=0):
        size = self.sizes.get(size, (size,))[0]
        side = size / 3**0.5
        self.boxes.moveTo(x, y, angle)
        self.boxes.moveTo(-0.5*side, 0.5*size, angle)
        for i in range(6):
            self.boxes.edge(side)
            self.boxes.corner(-60)

def argparseSections(s):
    m = re.match(r"(\d+(\.\d+)?)/(\d+)", s)
    if m:
        n = int(m.group(3))
        print([ float(m.group(1)) ] * n)
        return [ float(m.group(1))/n ] * n
    m = re.match(r"(\d+(\.\d+)?)\*(\d+)", s)
    if m:
        n = int(m.group(3))
        return [ float(m.group(1)) ] * n
    try:
        return [float(part) for part in s.split(":")]
    except ValueError:
        raise argparse.ArgumentTypeError("Don't understand sections string")

class Boxes:

    def __init__(self):
        self.argparser = ArgumentParser(description=self.__doc__)
        self.argparser.add_argument(
            "--thickness",  action="store", type=float, default=4.0,
            help="thickness of the material")
        self.argparser.add_argument(
            "--output",  action="store", type=str, default="box.svg",
            help="name of resulting file")
        self.argparser.add_argument(
            "--debug",  action="store_true", default=False,
            help="print surrounding boxes for some structures")
        self.argparser.add_argument(
            "--burn",  action="store", type=float, default=0.05,
            help="burn correction in mm")

    def open(self, width, height):
        self.spacing = 2*self.burn + 0.5 * self.thickness

        self.fingerHoleEdgeWidth = 1.0    # multitudes of self.thickness
        self.bedBoltSettings = (3, 5.5, 2, 20, 15) #d, d_nut, h_nut, l, l1
        self.hexHolesSettings = (5, 3, 'circle') # r, dist, style
        self._init_surface(width, height)
        self._buildObjects()

    def buildArgParser(self, *l):
        for arg in l:
            if arg == "x":
                self.argparser.add_argument(
                    "--x",  action="store", type=float, default=100.0,
                    help="inner width in mm")
            elif arg == "y":
                self.argparser.add_argument(
                    "--y",  action="store", type=float, default=100.0,
                    help="inner depth in mm")
            elif arg == "sx":
                self.argparser.add_argument(
                    "--sx",  action="store", type=argparseSections,
                    default="50*3",
                    help="""sections left to right in mm. Possible formats: overallwidth/numberof sections e.g. "250/5"; sectionwith*numberofsections e.g. "50*5"; section widths separated by ":" e.g. "30:25.5:70"
""")
            elif arg == "sy":
                self.argparser.add_argument(
                    "--sy",  action="store", type=argparseSections,
                    default="50*3",
                    help="""sections back to front in mm. See --sx for format""")
            elif arg == "h":
                self.argparser.add_argument(
                    "--h",  action="store", type=float, default=100.0,
                    help="inner height in mm")
            elif arg == "hi":
                self.argparser.add_argument(
                    "--hi",  action="store", type=float, default=0.0,
                    help="inner height of inner walls in mm (leave to zero for same as outer walls)")
            else:
                raise ValueError("No default for argument", arg)

    def parseArgs(self, args=None):
        self.argparser.parse_args(args=args, namespace=self)

    def addPart(self, part, name=None):
        if name is None:
            name = part.__class__.__name__
            name = name[0].lower() + name[1:]
        #if not hasattr(self, name):
        setattr(self, name, part)
        if isinstance(part, edges.Edge):
            self.edges[part.char] = part

    def _buildObjects(self):
        self.edges = {}
        self.addPart(edges.Edge(self, None))
        self.addPart(edges.OutSetEdge(self, None))

        # Share settings object
        s = edges.FingerJointSettings(self.thickness)
        self.addPart(edges.FingerJointEdge(self, s))
        self.addPart(edges.FingerJointEdgeCounterPart(self, s))
        self.addPart(edges.FingerHoleEdge(self, s))
        self.addPart(edges.FingerHoles(self, s))

        s = edges.DoveTailSettings(self.thickness)
        self.addPart(edges.DoveTailJoint(self, s))
        self.addPart(edges.DoveTailJointCounterPart(self, s))
        s = edges.FlexSettings(self.thickness)
        self.addPart(edges.FlexEdge(self, s))

        self.addPart(NutHole(self, None))

    def _init_surface(self, width, height):
        #mm2pt = 90 / 25.4 / 1.25
        mm2pt = 1
        #width *= mm2pt
        #height *= mm2pt #3.543307
        self.surface = cairo.SVGSurface(self.output, width, height)
        self.ctx = ctx = cairo.Context(self.surface)
        ctx.translate(0, height)
        ctx.scale(mm2pt, -mm2pt)

        #ctx.set_source_rgb(1.0, 1.0, 1.0)
        #ctx.rectangle(0, 0, width, height)
        #ctx.fill()

        ctx.set_source_rgb(0.0, 0.0, 0.0)
        ctx.set_line_width(2*self.burn)


    def cc(self, callback, number, x=0.0, y=None):
        """call callback"""
        if y is None:
            y = self.burn
        self.ctx.save()
        self.moveTo(x, y)
        if callable(callback):
            callback(number)
        elif hasattr(callback, '__getitem__'):
            try:
                callback = callback[number]
                if callable(callback):
                    callback()
            except (KeyError, IndexError):
                pass
            except:
                self.ctx.restore()
                raise
        self.ctx.restore()

    def getEntry(self, param, idx):
        if isinstance(param, list):
            if len(param)>idx:
                return param[idx]
            else:
                return None
        else:
            return param

    def close(self):
        self.ctx.stroke()
        self.surface.flush()
        self.surface.finish()

        f = open(self.output, "r+")
        s = f.read(1024)
        pos = s.find('pt"')
        if pos > 0:
            f.seek(pos)
            f.write("mm")
        else:
            print("Could not replace pt with mm")
        pos = s.find('pt"', pos+3)
        if pos > 0:
            f.seek(pos)
            f.write("mm")
        else:
            print("Could not replace pt with mm")

    ############################################################
    ### Turtle graphics commands
    ############################################################

    def corner(self, degrees, radius=0):
        rad = degrees*math.pi/180
        if degrees > 0:
            self.ctx.arc(0, radius+self.burn, radius+self.burn,
                     -0.5*math.pi, rad - 0.5*math.pi)
        elif radius > self.burn:
            self.ctx.arc_negative(0, -(radius-self.burn), radius-self.burn,
                     0.5*math.pi, rad + 0.5*math.pi)
        else: # not rounded inner corner
            self.ctx.arc_negative(0, self.burn-radius, self.burn-radius,
                         -0.5*math.pi, -0.5*math.pi+rad)

        self.continueDirection(rad)

    def edge(self, length):
        self.ctx.move_to(0,0)
        self.ctx.line_to(length, 0)
        self.ctx.translate(*self.ctx.get_current_point())

    def curveTo(self, x1, y1, x2, y2, x3, y3):
        """control point 1, control point 2, end point"""
        self.ctx.curve_to(x1, y1, x2, y2, x3, y3)
        dx = x3-x2
        dy = y3-y2
        rad = math.atan2(dy, dx)
        self.continueDirection(rad)

    def polyline(self, *args):
        for i, arg in enumerate(args):
            if i % 2:
                self.corner(arg)
            else:
                self.edge(arg)

    def bedBoltHole(self, length, bedBoltSettings=None):
        d, d_nut, h_nut, l, l1 = bedBoltSettings or self.bedBoltSettings
        self.edge((length-d)/2.0)
        self.corner(90)
        self.edge(l1)
        self.corner(90)
        self.edge((d_nut-d)/2.0)
        self.corner(-90)
        self.edge(h_nut)
        self.corner(-90)
        self.edge((d_nut-d)/2.0)
        self.corner(90)
        self.edge(l-l1-h_nut)
        self.corner(-90)
        self.edge(d)
        self.corner(-90)
        self.edge(l-l1-h_nut)
        self.corner(90)
        self.edge((d_nut-d)/2.0)
        self.corner(-90)
        self.edge(h_nut)
        self.corner(-90)
        self.edge((d_nut-d)/2.0)
        self.corner(90)
        self.edge(l1)
        self.corner(90)
        self.edge((length-d)/2.0)


    def grip(self, length, depth):
        """corrugated edge useful as an gipping area"""
        grooves = int(length // (depth*2.0)) + 1
        depth = length / grooves / 4.0
        for groove in range(grooves):
            self.corner(90, depth)
            self.corner(-180, depth)
            self.corner(90, depth)

    def _latchHole(self, length):
        self.edge(1.1*self.thickness)
        self.corner(-90)
        self.edge(length/2.0+0.2*self.thickness)
        self.corner(-90)
        self.edge(1.1*self.thickness)

    def _latchGrip(self, length):
        self.corner(90, self.thickness/4.0)
        self.grip(length/2.0-self.thickness/2.0-0.2*self.thickness, self.thickness/2.0)
        self.corner(90, self.thickness/4.0)

    def latch(self, length, positive=True, reverse=False):
        """Fix a flex box door at the box
        positive: False: Door side; True: Box side
        reverse: True when running away from the latch
        """
        if positive:
            if reverse:
                self.edge(length/2.0-self.burn)
            self.corner(-90)
            self.edge(self.thickness)
            self.corner(90)
            self.edge(length/2.0)
            self.corner(90)
            self.edge(self.thickness)
            self.corner(-90)
            if not reverse:
                self.edge(length/2.0-self.burn)
        else:
            if reverse:
                self._latchGrip(length)
            else:
                self.corner(90)
            self._latchHole(length)
            if not reverse:
                self._latchGrip(length)
            else:
                self.corner(90)

    def handle(self, x, h, hl, r=30):
        """Creates and Edge with a handle"""
        d = (x-hl-2*r)/2.0
        if d < 0:
            print("Handle too wide")

        self.ctx.save()

        # Hole
        self.moveTo(d+2*r, 0)
        self.edge(hl-2*r)
        self.corner(-90, r)
        self.edge(h-3*r)
        self.corner(-90, r)
        self.edge(hl-2*r)
        self.corner(-90, r)
        self.edge(h-3*r)
        self.corner(-90, r)

        self.ctx.restore()
        self.moveTo(0,0)

        self.curveTo(d, 0, d, 0, d, -h+r)
        self.curveTo(r, 0, r, 0, r, r)
        self.edge(hl)
        self.curveTo(r, 0, r, 0, r, r)
        self.curveTo(h-r, 0, h-r, 0, h-r, -d)

    ### Navigation

    def moveTo(self, x, y=0.0, degrees=0):
        self.ctx.move_to(0, 0)
        self.ctx.translate(x, y)
        self.ctx.rotate(degrees*math.pi/180.0)
        self.ctx.move_to(0, 0)

    def continueDirection(self, angle=0):
        self.ctx.translate(*self.ctx.get_current_point())
        self.ctx.rotate(angle)

    def move(self, x, y, where, before=False):
        """Intended to be used by parts
        where can be combinations of "up", "down", "left", "right" and "only"
        when "only" is included the move is only done when before is True
        The function returns whether actual drawing of the part
        should be omited.
        """
        if not where:
            return False

        terms = where.split()
        dontdraw = before and "only" in terms

        moves = {
            "up": (0, y, False),
            "down" : (0, -y, True),
            "left" : (-x, 0, True),
            "right" : (x, 0, False),
            "only" : (0, 0, None),
            }
        for term in terms:
            if not term in moves:
                raise ValueError("Unknown direction: '%s'" % term)
            x, y, movebeforeprint = moves[term]
            if movebeforeprint and before:
                self.moveTo(x, y)
            elif (not movebeforeprint and not before) or dontdraw:
                self.moveTo(x, y)
        return dontdraw



    # Building blocks

    def fingerHolesAt(self, x, y, length, angle=90,
                      bedBolts=None, bedBoltSettings=None):
        self.ctx.save()
        self.moveTo(x, y, angle)
        self.fingerHoles(length, bedBolts, bedBoltSettings)
        self.ctx.restore()

    @restore
    def hole(self, x, y, r):
        self.moveTo(x+r, y)
        self.ctx.arc(-r, 0, r, 0, 2*math.pi)

    @restore
    def rectangularHole(self, x, y, dx, dy, r=0):
        self.moveTo(x+r-dx/2.0, y-dy/2.0, 180)
        for d in (dy, dx, dy, dx):
            self.corner(-90, r)
            self.edge(d-2*r)

    @restore
    def text(self, text, x=0, y=0, angle=0, align=""):
        self.moveTo(x, y, angle)
        (tx, ty, width, height, dx, dy) = self.ctx.text_extents(text)
        align = align.split()
        moves = {
            "top" : (0, -height),
            "middle" : (0, -0.5*height),
            "bottom" : (0, 0),
            "left" : (0, 0),
            "center" : (-0.5*width, 0),
            "right" : (-width, 0),
        }
        for a in align:
            if a in moves:
                self.moveTo(*moves[a])
            else:
                raise ValueError("Unknown alignment: %s" % align)

        self.ctx.scale(1, -1)
        self.ctx.show_text(text)

    @restore
    def NEMA(self, size, x=0, y=0, angle=0):
        nema = {
            #    motor,flange, holes, screws 
             8 : (20.3, 16,   15.4, 3),
            11 : (28.2, 22,   23,   4),
            14 : (35.2, 22,   26,   4),
            16 : (39.2, 22,   31,   4),
            17 : (42.2, 22,   31,   4),
            23 : (56.4, 38.1, 47.1, 5.2),
            24 : (60,   36,   49.8, 5.1),
            34 : (86.3, 73,   69.8, 6.6),
            42 : (110,  55.5, 89,   8.5),
             }
        width, flange, holedistance, diameter = nema[size]
        self.moveTo(x, y, angle)
        if self.debug:
            self.rectangularHole(0, 0, width, width)
        self.hole(0,0, 0.5*flange)
        for x in (-1, 1):
            for y in (-1, 1):
                self.hole(x*0.5*holedistance,
                          y*0.5*holedistance,
                          0.5*diameter)


    # hexHoles

    def hexHolesRectangle(self, x, y, settings=None, skip=None):
        """
        Fills a rectangle with holes.
        r : radius of holes
        b : space between holes
        style : what types of holes (not yet implemented)
        skip : function to check if hole should be present
               gets x, y, r, b, posx, posy
        """
        if settings is None:
            settings = self.hexHolesSettings
        r, b, style = settings

        w = r+b/2.0
        dist = w * math.cos(math.pi/6.0)

        # how many half circles do fit
        cx = int((x-2*r) // (w)) + 2
        cy = int((y-2*r) // (dist)) + 2

        # what's left on the sides
        lx = (x - (2*r+(cx-2)*w))/2.0
        ly = (y - (2*r+((cy//2)*2)*dist-2*dist))/2.0

        for i in range(cy//2):
            for j in range((cx-(i%2))//2):
                px = 2*j*w + r + lx
                py = i*2*dist + r + ly
                if i % 2:
                    px += w
                if skip and skip(x, y, r, b, px, py):
                    continue
                self.hole(px, py, r)

    def __skipcircle(self, x, y, r, b, posx, posy):
        cx, cy = x/2.0, y/2.0
        return (dist(posx-cx, posy-cy) > (cx-r))

    def hexHolesCircle(self, d, settings=None):
        d2 = d/2.0
        self.hexHolesRectangle(d, d, settings=settings, skip=self.__skipcircle)

    def hexHolesPlate(self, x, y, rc, settings=None):
        def skip(x, y, r, b, posx, posy):
            posx = abs(posx-(x/2.0))
            posy = abs(posy-(y/2.0))

            wx = 0.5*x-rc-r
            wy = 0.5*y-rc-r

            if (posx <= wx) or (posy <= wx):
                return 0
            return dist(posx-wx, posy-wy) > rc

        self.hexHolesRectangle(x, y, settings, skip=skip)

    def hexHolesHex(self, h, settings=None, grow=None):
        if settings is None:
            settings = self.hexHolesSettings
        r, b, style = settings

        self.ctx.rectangle(0, 0, h, h)
        w = r+b/2.0
        dist = w * math.cos(math.pi/6.0)
        cy = 2 * int((h-4*dist)// (4*w)) + 1

        leftover = h-2*r-(cy-1)*2*r
        if grow=='space ':
            b += leftover / (cy-1) / 2

        # recalulate with adjusted values
        w = r+b/2.0
        dist = w * math.cos(math.pi/6.0)

        self.moveTo(h/2.0-(cy//2)*2*w, h/2.0)
        for j in range(cy):
            self.hole(2*j*w, 0, r)
        for i in range(1, cy/2+1):
            for j in range(cy-i):
                self.hole(j*2*w+i*w, i*2*dist, r)
                self.hole(j*2*w+i*w, -i*2*dist, r)

    ##################################################
    ### parts
    ##################################################

    def roundedPlate(self, x, y, r, callback=None,
                     holesMargin=None, holesSettings=None,
                     bedBolts=None, bedBoltSettings=None,
                     move=None):
        """fits surroundingWall
        first edge is split to have a joint in the middle of the side
        callback is called at the beginning of the straight edges
        0, 1 for the two part of the first edge, 2, 3, 4 for the others

        set holesMargin to get hex holes.
        """

        overallwidth = x+2*self.fingerJointEdge.spacing()
        overallheight = y+2*self.fingerJointEdge.spacing()

        if self.move(overallwidth, overallheight, move, before=True):
            return

        self.ctx.save()
        self.moveTo(self.fingerJointEdge.margin(),
                    self.fingerJointEdge.margin())
        self.moveTo(r, 0)

        self.cc(callback, 0)
        self.fingerJointEdge(x/2.0-r, bedBolts=self.getEntry(bedBolts, 0),
                         bedBoltSettings=self.getEntry(bedBoltSettings, 0))
        self.cc(callback, 1)
        self.fingerJointEdge(x/2.0-r, bedBolts=self.getEntry(bedBolts, 1),
                         bedBoltSettings=self.getEntry(bedBoltSettings, 1))
        for i, l in zip(range(3), (y, x, y)):
            self.corner(90, r)
            self.cc(callback, i+2)
            self.fingerJointEdge(l-2*r, bedBolts=self.getEntry(bedBolts, i+2),
                         bedBoltSettings=self.getEntry(bedBoltSettings, i+2))
        self.corner(90, r)

        self.ctx.restore()
        self.ctx.save()

        self.moveTo(self.fingerJointEdge.margin(),
                    self.fingerJointEdge.margin())

        if holesMargin is not None:
            self.moveTo(holesMargin, holesMargin)
            if r > holesMargin:
                r -= holesMargin
            else:
                r = 0
            self.hexHolesPlate(x-2*holesMargin, y-2*holesMargin, r,
                               settings=holesSettings)
        self.ctx.restore()
        self.ctx.stroke()
        self.move(overallwidth, overallheight, move)

    def surroundingWall(self, x, y, r, h,
                        bottom='e', top='e',
                        callback=None,
                        move=None):
        """
        h : inner height, not counting the joints
        callback is called a beginn of the flat sides with
          0 for right half of first x side;
          1 and 3 for y sides;
          2 for second x side
          4 for second half of the first x side
        """
        c4 = (r+self.burn)*math.pi*0.5 # circumference of quarter circle
        c4 = 0.9 * c4 # stretch flex 10%

        top = self.edges.get(top, top)
        bottom = self.edges.get(bottom, bottom)

        topwidth = top.width()
        bottomwidth = bottom.width()

        overallwidth = 2*x + 2*y - 8*r + 4*c4 + \
            self.edges["d"].spacing() + self.edges["D"].spacing()
        overallheight = h + top.spacing() + bottom.spacing()


        if self.move(overallwidth, overallheight, move, before=True):
            return

        self.ctx.save()
        self.moveTo(self.edges["D"].margin(), bottom.margin())

        self.cc(callback, 0, y=bottomwidth+self.burn)
        bottom(x/2.0-r)
        for i, l in zip(range(4), (y, x, y, 0)):
            self.flexEdge(c4, h+topwidth+bottomwidth)
            self.cc(callback, i+1, y=bottomwidth+self.burn)
            if i < 3:
                bottom(l-2*r)
        bottom(x/2.0-r)

        self.corner(90)
        self.edge(bottomwidth)
        self.doveTailJoint(h)
        self.edge(topwidth)
        self.corner(90)

        top(x/2.0-r)
        for i, l in zip(range(4), (y, x, y, 0)):
            self.edge(c4)
            if i < 3:
                top(l - 2*r)
        top(x/2.0-r)

        self.corner(90)
        self.edge(topwidth)
        self.doveTailJointCounterPart(h)
        self.edge(bottomwidth)
        self.corner(90)

        self.ctx.restore()
        self.ctx.stroke()

        self.move(overallwidth, overallheight, move)


    def rectangularWall(self, x, y, edges="eeee",
                        holesMargin=None, holesSettings=None,
                        bedBolts=None, bedBoltSettings=None,
                        callback=None,
                        move=None):
        if len(edges) != 4:
            raise ValueError("four edges required")
        edges = [self.edges.get(e, e) for e in edges]
        edges += edges # append for wrapping around

        overallwidth = x + edges[-1].spacing() + edges[1].spacing()
        overallheight = y + edges[0].spacing() + edges[2].spacing()

        if self.move(overallwidth, overallheight, move, before=True):
            return

        self.ctx.save()
        self.moveTo(edges[-1].margin(), edges[0].margin())
        for i, l in enumerate((x, y, x, y)):
            self.edge(edges[i-1].width())
            self.cc(callback, i, y=edges[i].width()+self.burn)
            edges[i](l,
                     bedBolts=self.getEntry(bedBolts, i),
                     bedBoltSettings=self.getEntry(bedBoltSettings, i))
            self.edge(edges[i+1].width())
            self.corner(90-edges[i].endAngle()-edges[i+1].startAngle())

        if holesMargin is not None:
            self.moveTo(holesMargin+edges[-1].width(),
                        holesMargin+edges[0].width())
            self.hexHolesRectangle(x-2*holesMargin, y-2*holesMargin)
        self.ctx.restore()
        self.ctx.stroke()

        self.move(overallwidth, overallheight, move)


    ##################################################
    ### main
    ##################################################

class DemoBox(Boxes):
    """A simple fully enclosed box showcasing different finger joints"""
    def __init__(self):
        Boxes.__init__(self)
        self.buildArgParser("x", "y", "h")

    def render(self):
        x, y, h, t = self.x, self.y, self.h, self.thickness
        self.open(2*x+10*self.thickness, y+2*h+20*self.thickness)
        self.ctx.save()

        self.moveTo(t, t)
        self.rectangularWall(x, y, "ffff")
        self.moveTo(x+4*t, 0)
        self.rectangularWall(x, y, "FFFF")

        self.ctx.restore()

        self.moveTo(t, y+4*t)
        for i in range(2):
            for l in (x, y):
                self.rectangularWall(l, h, "hffF")
                self.moveTo(l+4*t, 0)
            self.moveTo(-x-y-8*t, h+4*t)


        self.close()

if __name__ == '__main__':
    b = DemoBox()
    b.parseArgs()
    b.render()