''' ellipse.py Copyright (C) 2021 - 2024 Phillip A Carter Copyright (C) 2021 - 2024 Gregory D Carl 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 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, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. ''' import os import sys import numpy import gettext for f in sys.path: if '/lib/python' in f: if '/usr' in f: localeDir = 'usr/share/locale' else: localeDir = os.path.join(f'{f.split("/lib")[0]}', 'share', 'locale') break gettext.install("linuxcnc", localedir=localeDir) # Conv is the upstream calling module def preview(Conv, fTmp, fNgc, fNgcBkp, matNumber, matName, preAmble, postAmble, leadinLength, leadoutLength, isCenter, xOffset, yOffset, kerfWidth, isExternal, width, height, angle, unitsPerMm): error = '' msg1 = _('entry is invalid') valid, xOffset = Conv.conv_is_float(xOffset) if not valid and xOffset: msg0 = _('X ORIGIN') error += f'{msg0} {msg1}\n\n' valid, yOffset = Conv.conv_is_float(yOffset) if not valid and yOffset: msg0 = _('Y ORIGIN') error += f'{msg0} {msg1}\n\n' valid, leadinLength = Conv.conv_is_float(leadinLength) if not valid and leadinLength: msg0 = _('LEAD IN') error += f'{msg0} {msg1}\n\n' valid, leadoutLength = Conv.conv_is_float(leadoutLength) if not valid and leadoutLength: msg0 = _('LEAD OUT') error += f'{msg0} {msg1}\n\n' valid, width = Conv.conv_is_float(width) if not valid and width: msg0 = _('WIDTH') error += f'{msg0} {msg1}\n\n' valid, height = Conv.conv_is_float(height) if not valid and height: msg0 = _('HEIGHT') error += f'{msg0} {msg1}\n\n' valid, angle = Conv.conv_is_float(angle) if not valid and angle: msg0 = _('ANGLE') error += f'{msg0} {msg1}\n\n' valid, kerfWidth = Conv.conv_is_float(kerfWidth) if not valid: msg = _('Invalid Kerf Width entry in material') error += f'{msg}\n\n' if error: return error if width == 0: msg = _('WIDTH cannot be zero') error += f'{msg}\n\n' if height == 0: msg = _('HEIGHT cannot be zero') error += f'{msg}\n\n' if error: return error angle = numpy.radians(angle) if isExternal: width += kerfWidth height += kerfWidth else: width -= kerfWidth height -= kerfWidth if isCenter: centerX = xOffset centerY = yOffset else: centerX = xOffset + width / 2 centerY = yOffset + height / 2 leadInOffset = numpy.sin(45) * leadinLength leadOutOffset = numpy.sin(45) * leadoutLength # approx perimeter in mm perim = (numpy.pi * (3 * (width + height) - numpy.sqrt((3 * width + height) * (width + 3 * height)))) * unitsPerMm # number of points is 360 unless perimeter is > 360mm then have a segment length of 1mm points = 360 if perim <= 360 else int(perim) mult = float(360) / points # start/end point of cut start = int(points * 0.625) # create the ellipse points in an array array = numpy.linspace(0, points, points) X = centerX + width / 2 * numpy.cos(numpy.radians(array * mult)) Y = centerY + height / 2 * numpy.sin(numpy.radians(array * mult)) # rotate the ellipse if required for point in range(points): x = X[point] y = Y[point] X[point] = x * numpy.cos(angle) - y * numpy.sin(angle) Y[point] = x * numpy.sin(angle) + y * numpy.cos(angle) # initialize files outTmp = open(fTmp, 'w') outNgc = open(fNgc, 'w') inWiz = open(fNgcBkp, 'r') # begin writing the gcode for line in inWiz: line = line.strip() if line and line[0] not in ';': if '(new conversational file)' in line: if('\\n') in preAmble: outNgc.write('(preamble)\n') for l in preAmble.split('\\n'): outNgc.write(f'{l}\n') else: outNgc.write(f'\n{preAmble} (preamble)\n') break elif '(postamble)' in line: break elif 'M2' in line.upper() or 'M02' in line.upper() or 'M30' in line.upper(): continue outNgc.write(f"{line}\n") outTmp.write('\n(conversational ellipse)\n') outTmp.write(f';using material #{matNumber}: {matName}\n') outTmp.write(f'M190 P{matNumber}\n') outTmp.write('M66 P3 L3 Q1\n') outTmp.write('F#<_hal[plasmac.cut-feed-rate]>\n') # get the angle of the first segment if isExternal: dX = X[start - 1] - X[start] dY = Y[start - 1] - Y[start] else: dX = X[start] - X[start + 1] dY = Y[start] - Y[start + 1] segAngle = numpy.arctan2(dY, dX) # set direction constants right = numpy.radians(0) up = numpy.radians(90) left = numpy.radians(180) down = numpy.radians(270) # leadin points if required if leadInOffset > 0: if isExternal: dir = [up, left] else: dir = [down, right] xlcenter = X[start] + (leadInOffset * numpy.cos(segAngle + dir[0])) ylcenter = Y[start] + (leadInOffset * numpy.sin(segAngle + dir[0])) xlStart = xlcenter + (leadInOffset * numpy.cos(segAngle + dir[1])) ylStart = ylcenter + (leadInOffset * numpy.sin(segAngle + dir[1])) outTmp.write(f'G00 X{xlStart:.6f} Y{ylStart:.6f}\n') outTmp.write('M03 $0 S1\n') outTmp.write(f'G03 X{X[start]:.6f} Y{Y[start]:.6f} I{xlcenter - xlStart:.6f} J{ylcenter - ylStart:.6f}\n') else: outTmp.write(f'G00 X{X[start]:.6f} Y{Y[start]:.6f}\n') outTmp.write('M03 $0 S01\n') # write the ellipse points if isExternal: for point in range(start, -1, -1): outTmp.write(f'G01 X{X[point]:.6f} Y{Y[point]:.6f}\n') for point in range(points - 1, start - 1, -1): outTmp.write(f'G01 X{X[point]:.6f} Y{Y[point]:.6f}\n') else: for point in range(start, points, 1): outTmp.write(f'G01 X{X[point]:.6f} Y{Y[point]:.6f}\n') for point in range(0, start + 1, 1): outTmp.write(f'G01 X{X[point]:.6f} Y{Y[point]:.6f}\n') # leadout points if required if leadOutOffset: if isExternal: dir = [up, right] else: dir = [down, left] xlcenter = X[start] + (leadOutOffset * numpy.cos(segAngle + dir[0])) ylcenter = Y[start] + (leadOutOffset * numpy.sin(segAngle + dir[0])) xlEnd = xlcenter + (leadOutOffset * numpy.cos(segAngle + dir[1])) ylEnd = ylcenter + (leadOutOffset * numpy.sin(segAngle + dir[1])) outTmp.write(f'G03 X{xlEnd:.6f} Y{ylEnd:.6f} I{xlcenter - X[start]:.6f} J{ylcenter - Y[start]:.6f}\n') # finish off and close files outTmp.write('M05 $0\n') outTmp.close() outTmp = open(fTmp, 'r') for line in outTmp: outNgc.write(line) outTmp.close() if('\\n') in postAmble: outNgc.write('\n(postamble)\n') for l in postAmble.split('\\n'): outNgc.write(f'{l}\n') else: outNgc.write(f'\n{postAmble} (postamble)\n') outNgc.write('M02\n') outNgc.close() return False