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engrave.py
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#!/usr/bin/python
"""
engrave-xx.py G-Code Generator
Copyright (C) <2008> <Lawrence Glaister> <ve7it at shaw dot ca>
based on work by John Thornton -- GUI framwork from arcbuddy.py
Ben Lipkowitz (fenn)-- cxf2cnc.py v0.5 font parsing code
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/>.
To make it a menu item in Ubuntu use the Alacarte Menu Editor and add
the command python YourPathToThisFile/grill.py
make sure you have made the file executable by right
clicking and selecting properties then Permissions and Execute
To use with LinuxCNC see the instructions at:
https://github.com/linuxcnc/simple-gcode-generators
Version 10 intial code
version 11 - lpg 14oct2008 fixed sytax error that prevented code running on
python 2.4 (supplied with ubuntu 6.06)
"""
version = '11'
#fontfile = "/usr/share/qcad/fonts/romans2.cxf"
fontfile = "/usr/share/qcad/fonts/romanc.cxf"
#fontfile = "/usr/share/qcad/fonts/normal.cxf"
from Tkinter import *
from math import *
import os
import re
IN_AXIS = os.environ.has_key("AXIS_PROGRESS_BAR")
#=======================================================================
# This routine parses the .cxf font file and builds a font dictionary of
# line segment strokes required to cut each character.
# Arcs (only used in some fonts) are converted to a number of line
# segemnts based on the angular length of the arc. Since the idea of
# this font description is to make it support independant x and y scaling,
# we can not use native arcs in the gcode.
#=======================================================================
def parse(file):
font = {}
key = None
num_cmds = 0
line_num = 0
for text in file:
#format for a typical letter (lowercase r):
##comment, with a blank line after it
#
#[r] 3
#L 0,0,0,6
#L 0,6,2,6
#A 2,5,1,0,90
#
line_num += 1
end_char = re.match('^$', text) #blank line
if end_char and key: #save the character to our dictionary
font[key] = Character(key)
font[key].stroke_list = stroke_list
font[key].xmax = xmax
if (num_cmds != cmds_read):
print "(warning: discrepancy in number of commands %s, line %s, %s != %s )" % (fontfile, line_num, num_cmds, cmds_read)
new_cmd = re.match('^\[(.*)\]\s(\d+)', text)
if new_cmd: #new character
key = new_cmd.group(1)
num_cmds = int(new_cmd.group(2)) #for debug
cmds_read = 0
stroke_list = []
xmax, ymax = 0, 0
line_cmd = re.match('^L (.*)', text)
if line_cmd:
cmds_read += 1
coords = line_cmd.group(1)
coords = [float(n) for n in coords.split(',')]
stroke_list += [Line(coords)]
xmax = max(xmax, coords[0], coords[2])
arc_cmd = re.match('^A (.*)', text)
if arc_cmd:
cmds_read += 1
coords = arc_cmd.group(1)
coords = [float(n) for n in coords.split(',')]
xcenter, ycenter, radius, start_angle, end_angle = coords
# since font defn has arcs as ccw, we need some font foo
if ( end_angle < start_angle ):
start_angle -= 360.0
# approximate arc with line seg every 20 degrees
segs = int((end_angle - start_angle) / 20) + 1
angleincr = (end_angle - start_angle)/segs
xstart = cos(start_angle * pi/180) * radius + xcenter
ystart = sin(start_angle * pi/180) * radius + ycenter
angle = start_angle
for i in range(segs):
angle += angleincr
xend = cos(angle * pi/180) * radius + xcenter
yend = sin(angle * pi/180) * radius + ycenter
coords = [xstart,ystart,xend,yend]
stroke_list += [Line(coords)]
xmax = max(xmax, coords[0], coords[2])
ymax = max(ymax, coords[1], coords[3])
xstart = xend
ystart = yend
return font
#=======================================================================
class Character:
def __init__(self, key):
self.key = key
self.stroke_list = []
def __repr__(self):
return "%s" % (self.stroke_list)
def get_xmax(self):
try: return max([s.xmax for s in self.stroke_list[:]])
except ValueError: return 0
def get_ymax(self):
try: return max([s.ymax for s in self.stroke_list[:]])
except ValueError: return 0
#=======================================================================
class Line:
def __init__(self, coords):
self.xstart, self.ystart, self.xend, self.yend = coords
self.xmax = max(self.xstart, self.xend)
self.ymax = max(self.ystart, self.yend)
def __repr__(self):
return "Line([%s, %s, %s, %s])" % (self.xstart, self.ystart, self.xend, self.yend)
#=======================================================================
class Application(Frame):
def __init__(self, master=None):
Frame.__init__(self, master)
self.grid()
self.createWidgets()
self.DoIt()
def createWidgets(self):
self.segID = []
self.gcode = []
self.PreviewFrame = Frame(self,bd=5)
self.PreviewFrame.grid(row=0, column=0)
self.PreviewCanvas = Canvas(self.PreviewFrame,width=300, height=300, bg='white', bd='3', relief = 'raised')
self.PreviewCanvas.grid(sticky=N+S+E+W)
self.XLine = self.PreviewCanvas.create_line(15,150,285,150, fill = 'green')
self.YLine = self.PreviewCanvas.create_line(150,15,150,285, fill = 'green')
self.EntryFrame = Frame(self,bd=5)
self.EntryFrame.grid(row=0, column=1)
self.st00 = Label(self.EntryFrame, text='Engrave a Text String\n')
self.st00.grid(row=0, column=0, columnspan=2)
self.st01 = Label(self.EntryFrame, text='Preamble')
self.st01.grid(row=1, column=0)
self.PreambleVar = StringVar()
self.PreambleVar.set('G17 G20 G90 G64 P0.003 M3 S3000 M7 F5')
self.Preamble = Entry(self.EntryFrame, textvariable=self.PreambleVar ,width=40)
self.Preamble.grid(row=1, column=1)
self.st02 = Label(self.EntryFrame, text='Font File (Qcad .cxf)')
self.st02.grid(row=2, column=0)
self.FontVar = StringVar()
self.FontVar.set(fontfile)
self.Font = Entry(self.EntryFrame, textvariable=self.FontVar ,width=40)
self.Font.grid(row=2, column=1)
self.NormalColor = self.Font.cget('bg')
self.st03 = Label(self.EntryFrame, text='Text')
self.st03.grid(row=3, column=0)
self.TextVar = StringVar()
self.TextVar.set('*LinuxCNC Rocks*')
self.Text = Entry(self.EntryFrame, textvariable=self.TextVar ,width=40)
self.Text.grid(row=3, column=1)
self.st04 = Label(self.EntryFrame, text='X Start')
self.st04.grid(row=4, column=0)
self.XStartVar = StringVar()
self.XStartVar.set('1.0')
self.XStart = Entry(self.EntryFrame, textvariable=self.XStartVar ,width=15)
self.XStart.grid(row=4, column=1)
self.st05 = Label(self.EntryFrame, text='Y Start')
self.st05.grid(row=5, column=0)
self.YStartVar = StringVar()
self.YStartVar.set('2.0')
self.YStart = Entry(self.EntryFrame, textvariable=self.YStartVar ,width=15)
self.YStart.grid(row=5, column=1)
self.st06 = Label(self.EntryFrame, text='Angle(degrees)')
self.st06.grid(row=6, column=0)
self.AngleVar = StringVar()
self.AngleVar.set('0.0')
self.Angle = Entry(self.EntryFrame, textvariable=self.AngleVar ,width=15)
self.Angle.grid(row=6, column=1)
self.st07 = Label(self.EntryFrame, text='XScale')
self.st07.grid(row=7, column=0)
self.XScaleVar = StringVar()
self.XScaleVar.set('0.04')
self.XScale = Entry(self.EntryFrame, textvariable=self.XScaleVar ,width=15)
self.XScale.grid(row=7, column=1)
self.st08 = Label(self.EntryFrame, text='YScale')
self.st08.grid(row=8, column=0)
self.YScaleVar = StringVar()
self.YScaleVar.set('0.04')
self.YScale = Entry(self.EntryFrame, textvariable=self.YScaleVar ,width=15)
self.YScale.grid(row=8, column=1)
self.st09 = Label(self.EntryFrame, text='Char Space (% of Char)')
self.st09.grid(row=9, column=0)
self.CSpacePVar = StringVar()
self.CSpacePVar.set('25.0')
self.CSpaceP = Entry(self.EntryFrame, textvariable=self.CSpacePVar ,width=15)
self.CSpaceP.grid(row=9, column=1)
self.st10 = Label(self.EntryFrame, text='Word Space (% of Char)')
self.st10.grid(row=10, column=0)
self.WSpacePVar = StringVar()
self.WSpacePVar.set('100.0')
self.WSpaceP = Entry(self.EntryFrame, textvariable=self.WSpacePVar ,width=15)
self.WSpaceP.grid(row=10, column=1)
self.st12 = Label(self.EntryFrame, text='Engraving Depth')
self.st12.grid(row=12, column=0)
self.DepthVar = StringVar()
self.DepthVar.set('-0.010')
self.Depth = Entry(self.EntryFrame, textvariable=self.DepthVar ,width=15)
self.Depth.grid(row=12, column=1)
self.st13 = Label(self.EntryFrame, text='Safe Z')
self.st13.grid(row=13, column=0)
self.SafeZVar = StringVar()
self.SafeZVar.set('+0.100')
self.SafeZ = Entry(self.EntryFrame, width=15, textvariable = self.SafeZVar)
self.SafeZ.grid(row=13, column=1)
self.st14 = Label(self.EntryFrame, text='Postamble')
self.st14.grid(row=14, column=0)
self.PostambleVar = StringVar()
self.PostambleVar.set('M5 M9 M2')
self.Postamble = Entry(self.EntryFrame, textvariable=self.PostambleVar ,width=15)
self.Postamble.grid(row=14, column=1)
self.st15 = Label(self.EntryFrame, text='Text Orientation')
self.st15.grid(row=15, column=0)
self.MirrorVar = IntVar()
self.MirrorVar.set(0)
self.FlipVar = IntVar()
self.FlipVar.set(0)
Checkbutton(self.EntryFrame, text='Mirrored', variable=self.MirrorVar, command=self.DoIt).grid(row=15, column=1,sticky=W)
Checkbutton(self.EntryFrame, text='Flipped', variable=self.FlipVar,command=self.DoIt).grid(row=15, column=1,sticky=E)
self.DoItButton = Button(self.EntryFrame, text='Recalculate', command=self.DoIt)
self.DoItButton.grid(row=16, column=0)
self.ToClipboard = Button(self.EntryFrame, text='To Clipboard', command=self.CopyClipboard)
self.ToClipboard.grid(row=16, column=1)
if IN_AXIS:
self.quitButton = Button(self, text='Write to AXIS and Quit',command=self.WriteToAxis)
else:
self.quitButton = Button(self, text='Quit', command=self.quit)
self.quitButton.grid(row=13, column=0, sticky=S)
#=======================================================================
def CopyClipboard(self):
self.clipboard_clear()
for line in self.gcode:
self.clipboard_append(line+'\n')
#=======================================================================
def WriteToAxis(self):
for line in self.gcode:
sys.stdout.write(line+'\n')
self.quit()
#=======================================================================
def sanitize(self,string):
retval = ''
good=' ~!@#$%^&*_+=-{}[]|\:;"<>,./?'
for char in string:
if char.isalnum() or good.find(char) != -1:
retval += char
else: retval += ( ' 0x%02X ' %ord(char))
return retval
#=======================================================================
# routine takes an x and a y in raw internal format
# x and y scales are applied and then x,y pt is rotated by angle
# Returns new x,y tuple
def Rotn(self,x,y,xscale,yscale,angle):
Deg2Rad = 2.0 * pi / 360.0
xx = x * xscale
yy = y * yscale
rad = sqrt(xx * xx + yy * yy)
theta = atan2(yy,xx)
newx=rad * cos(theta + angle*Deg2Rad)
newy=rad * sin(theta + angle*Deg2Rad)
return newx,newy
#=======================================================================
def DoIt(self):
# range check inputs for gross errors
try:
self.Font.configure( bg = self.NormalColor )
file = open(self.Font.get())
except:
self.Font.configure( bg = 'red' )
return
Angle = float(self.AngleVar.get())
self.Angle.configure( bg = self.NormalColor )
if Angle <= -360.0 or Angle >= 360.0:
self.Angle.configure( bg = 'red' )
return
XScale = float(self.XScaleVar.get())
self.XScale.configure( bg = self.NormalColor )
if XScale <= 0.0:
self.XScale.configure( bg = 'red' )
return
YScale = float(self.YScaleVar.get())
self.YScale.configure( bg = self.NormalColor )
if YScale <= 0.0:
self.YScale.configure( bg = 'red' )
return
CSpaceP= float(self.CSpaceP.get())
self.CSpaceP.configure( bg = self.NormalColor )
if CSpaceP <= 0.0:
self.CSpaceP.configure( bg = 'red' )
return
WSpaceP= float(self.WSpaceP.get())
self.WSpaceP.configure( bg = self.NormalColor )
if WSpaceP <= 0.0:
self.WSpaceP.configure( bg = 'red' )
return
# erase old segs/display objects as needed
for seg in self.segID:
self.PreviewCanvas.delete(seg)
self.segID = []
# erase old gcode as needed
self.gcode = []
# temps used for engraving calcs
String = self.TextVar.get()
SafeZ = float(self.SafeZVar.get())
XStart = float(self.XStart.get())
YStart = float(self.YStart.get())
Depth = float(self.DepthVar.get())
XScale = float(self.XScaleVar.get())
YScale = float(self.YScaleVar.get())
CSpaceP= float(self.CSpaceP.get())
oldx = oldy = -99990.0 # last engraver position
self.gcode.append('( Code generated by engrave-'+version+'.py widget )')
self.gcode.append('( by Lawrence Glaister VE7IT - 2008 )')
self.gcode.append('( Engraving: "%s" at %.1f degrees)' %(self.sanitize(self.TextVar.get()),Angle))
self.gcode.append('( Fontfile: %s )' %(self.FontVar.get()))
self.gcode.append('#1000 = %.4f ( Safe Z )' %(SafeZ))
self.gcode.append('#1001 = %.4f ( Engraving Depth Z )' %(Depth))
self.gcode.append('#1002 = %.4f ( X Start )' %(XStart))
self.gcode.append('#1003 = %.4f ( Y Start )' %(YStart))
self.gcode.append('#1004 = %.4f ( X Scale )' %(XScale))
self.gcode.append('#1005 = %.4f ( Y Scale )' %(YScale))
self.gcode.append('#1006 = %.4f ( Angle )' %(Angle))
# write out subroutine for rotation logic
self.gcode.append("(===================================================================)")
self.gcode.append("(Subroutine to handle x,y rotation about 0,0)")
self.gcode.append("(input x,y get scaled, rotated then offset )")
self.gcode.append("( [#1 = 0 or 1 for a G0 or G1 type of move], [#2=x], [#3=y])")
self.gcode.append("o9000 sub")
self.gcode.append(" #28 = [#2 * #1004] ( scaled x )")
self.gcode.append(" #29 = [#3 * #1005] ( scaled y )")
self.gcode.append(" #30 = [SQRT[#28 * #28 + #29 * #29 ]] ( dist from 0 to x,y )")
self.gcode.append(" #31 = [ATAN[#29]/[#28]] ( direction to x,y )")
self.gcode.append(" #32 = [#30 * cos[#31 + #1006]] ( rotated x )")
self.gcode.append(" #33 = [#30 * sin[#31 + #1006]] ( rotated y )")
self.gcode.append(" o9010 if [#1 LT 0.5]" )
self.gcode.append(" G00 X[#32+#1002] Y[#33+#1003]")
self.gcode.append(" o9010 else")
self.gcode.append(" G01 X[#32+#1002] Y[#33+#1003]")
self.gcode.append(" o9010 endif")
self.gcode.append("o9000 endsub")
self.gcode.append("(===================================================================)")
self.gcode.append(self.PreambleVar.get())
self.gcode.append( 'G0 Z#1000')
font = parse(file) # build stroke lists from font file
file.close()
font_line_height = max(font[key].get_ymax() for key in font)
font_word_space = max(font[key].get_xmax() for key in font) * (WSpaceP/100.0)
font_char_space = font_word_space * (CSpaceP /100.0)
xoffset = 0 # distance along raw string in font units
# calc a plot scale so we can show about first 15 chars of string
# in the preview window
PlotScale = 15 * font['A'].get_xmax() * XScale / 150
for char in String:
if char == ' ':
xoffset += font_word_space
continue
try:
self.gcode.append("(character '%s')" % self.sanitize(char))
first_stroke = True
for stroke in font[char].stroke_list:
# self.gcode.append("(%f,%f to %f,%f)" %(stroke.xstart,stroke.ystart,stroke.xend,stroke.yend ))
dx = oldx - stroke.xstart
dy = oldy - stroke.ystart
dist = sqrt(dx*dx + dy*dy)
x1 = stroke.xstart + xoffset
y1 = stroke.ystart
if self.MirrorVar.get() == 1:
x1 = -x1
if self.FlipVar.get() == 1:
y1 = -y1
# check and see if we need to move to a new discontinuous start point
if (dist > 0.001) or first_stroke:
first_stroke = False
#lift engraver, rapid to start of stroke, drop tool
self.gcode.append("G0 Z#1000")
self.gcode.append('o9000 call [0] [%.4f] [%.4f]' %(x1,y1))
self.gcode.append("G1 Z#1001")
x2 = stroke.xend + xoffset
y2 = stroke.yend
if self.MirrorVar.get() == 1:
x2 = -x2
if self.FlipVar.get() == 1:
y2 = -y2
self.gcode.append('o9000 call [1] [%.4f] [%.4f]' %(x2,y2))
oldx, oldy = stroke.xend, stroke.yend
# since rotation and scaling is done in gcode, we need equivalent for plotting
# note that plot shows true shape and orientation of chrs, but starting x,y
# is always at the center of the preview window (offsets not displayed)
x1,y1 = self.Rotn(x1,y1,XScale,YScale,Angle)
x2,y2 = self.Rotn(x2,y2,XScale,YScale,Angle)
self.segID.append( self.PreviewCanvas.create_line(
150+x1/PlotScale, 150-y1/PlotScale,150+x2/PlotScale, 150-y2/PlotScale,
fill = 'black', width = 1))
# move over for next character
char_width = font[char].get_xmax()
xoffset += font_char_space + char_width
except KeyError:
self.gcode.append("(warning: character '0x%02X' not found in font defn)" % ord(char))
self.gcode.append("") # blank line after every char block
self.gcode.append( 'G0 Z#1000') # final engraver up
# finish up with icing
self.gcode.append(self.PostambleVar.get())
app = Application()
app.master.title("engrave-"+version+".py by Lawrence Glaister ")
app.mainloop()