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Copy pathprocessoffset.py
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executable file
·169 lines (155 loc) · 8.85 KB
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#!/usr/bin/env python
# coding=utf-8
'''
Copyright (C) 2008 Aaron Spike, aaron@ekips.org
Copyright (C) 2013 Sebastian Wüst, sebi@timewaster.de
Copyright (C) 2016 Alexander Pruss
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
'''
# standard libraries
import math
class OffsetProcessor:
def __init__(self, toolOffset=1., overcut=0.2, tolerance=0.01):
self.toolOffset = toolOffset
self.overcut = overcut
self.tolerance = tolerance
self.PI = math.pi
self.TWO_PI = 2 * math.pi
if self.toolOffset > 0.0:
self.toolOffsetFlat = self.tolerance / self.toolOffset * 4.5 # scale flatness to offset
else:
self.toolOffsetFlat = 0.0
@staticmethod
def changeLength(x1, y1, x2, y2, offset):
# change length of line
d = OffsetProcessor.getLength(x1, y1, x2, y2)
if offset < 0:
offset = max( -d, offset)
x = x2 + (x2 - x1) / d * offset
y = y2 + (y2 - y1) / d * offset
return [x, y]
@staticmethod
def getLength(ax,ay,bx,by):
return math.sqrt((ax-bx)**2+(ay-by)**2)
def processOffset(self, cmd, posX, posY):
# calculate offset correction (or dont)
if self.toolOffset == 0.0:
self.storePoint(cmd, posX, posY)
else:
# insert data into cache
self.vData.pop(0)
self.vData.insert(3, [cmd, posX, posY])
# decide if enough data is availabe
if self.vData[2][1] != -1.0:
if self.vData[1][1] == -1.0:
self.storePoint(self.vData[2][0], self.vData[2][1], self.vData[2][2])
else:
# perform tool offset correction (It's a *tad* complicated, if you want to understand it draw the data as lines on paper)
if self.vData[2][0] == 'PD': # If the 3rd entry in the cache is a pen down command make the line longer by the tool offset
pointThree = OffsetProcessor.changeLength(self.vData[1][1], self.vData[1][2], self.vData[2][1], self.vData[2][2], self.toolOffset)
self.storePoint('PD', pointThree[0], pointThree[1])
elif self.vData[0][1] != -1.0:
# Elif the 1st entry in the cache is filled with data and the 3rd entry is a pen up command shift
# the 3rd entry by the current tool offset position according to the 2nd command
pointThree = OffsetProcessor.changeLength(self.vData[0][1], self.vData[0][2], self.vData[1][1], self.vData[1][2], self.toolOffset)
pointThree[0] = self.vData[2][1] - (self.vData[1][1] - pointThree[0])
pointThree[1] = self.vData[2][2] - (self.vData[1][2] - pointThree[1])
self.storePoint('PU', pointThree[0], pointThree[1])
else:
# Else just write the 3rd entry
pointThree = [self.vData[2][1], self.vData[2][2]]
self.storePoint('PU', pointThree[0], pointThree[1])
if self.vData[3][0] == 'PD':
# If the 4th entry in the cache is a pen down command guide tool to next line with a circle between the prolonged 3rd and 4th entry
if OffsetProcessor.getLength(self.vData[2][1], self.vData[2][2], self.vData[3][1], self.vData[3][2]) >= self.toolOffset:
pointFour = OffsetProcessor.changeLength(self.vData[3][1], self.vData[3][2], self.vData[2][1], self.vData[2][2], - self.toolOffset)
else:
pointFour = OffsetProcessor.changeLength(self.vData[2][1], self.vData[2][2], self.vData[3][1], self.vData[3][2],
(self.toolOffset - OffsetProcessor.getLength(self.vData[2][1], self.vData[2][2], self.vData[3][1], self.vData[3][2])))
# get angle start and angle vector
angleStart = math.atan2(pointThree[1] - self.vData[2][2], pointThree[0] - self.vData[2][1])
angleVector = math.atan2(pointFour[1] - self.vData[2][2], pointFour[0] - self.vData[2][1]) - angleStart
# switch direction when arc is bigger than 180°
if angleVector > self.PI:
angleVector -= self.TWO_PI
elif angleVector < - self.PI:
angleVector += self.TWO_PI
# draw arc
if angleVector >= 0:
angle = angleStart + self.toolOffsetFlat
while angle < angleStart + angleVector:
self.storePoint('PD', self.vData[2][1] + math.cos(angle) * self.toolOffset, self.vData[2][2] + math.sin(angle) * self.toolOffset)
angle += self.toolOffsetFlat
else:
angle = angleStart - self.toolOffsetFlat
while angle > angleStart + angleVector:
self.storePoint('PD', self.vData[2][1] + math.cos(angle) * self.toolOffset, self.vData[2][2] + math.sin(angle) * self.toolOffset)
angle -= self.toolOffsetFlat
self.storePoint('PD', pointFour[0], pointFour[1])
def storePoint(self, command, x, y):
# skip when no change in movement
if self.lastPoint[0] == command and self.lastPoint[1] == x and self.lastPoint[2] == y:
return
if command == 'PD':
self.curPath.append((x,y))
elif command == 'PU':
if len(self.curPath) > 1:
self.paths.append(self.curPath)
self.curPath = []
self.curPath.append((x,y))
self.lastPoint = [command, x, y]
def processPath(self, path):
self.vData = [['', -1.0, -1.0], ['', -1.0, -1.0], ['', -1.0, -1.0], ['', -1.0, -1.0]]
self.paths = []
self.curPath = []
self.lastPoint = [0, 0, 0]
self.processOffset('PU', 0, 0)
oldPosX = float("inf")
oldPosY = float("inf")
for singlePath in path:
cmd = 'PU'
for singlePathPoint in singlePath:
posX, posY = singlePathPoint
# check if point is repeating, if so, ignore
if OffsetProcessor.getLength(oldPosX,oldPosY,posX,posY) >= self.tolerance:
self.processOffset(cmd, posX, posY)
cmd = 'PD'
oldPosX = posX
oldPosY = posY
# perform overcut
if self.overcut > 0.0:
# check if last and first points are the same, otherwise the path is not closed and no overcut can be performed
if OffsetProcessor.getLength(oldPosX,oldPosY,singlePath[0][0],singlePath[0][1]) <= self.tolerance:
overcutLength = 0
for singlePathPoint in singlePath:
posX, posY = singlePathPoint
# check if point is repeating, if so, ignore
distance = OffsetProcessor.getLength(oldPosX,oldPosY, posX,posY)
if distance >= self.tolerance:
overcutLength += distance
if overcutLength >= self.overcut:
newLength = OffsetProcessor.changeLength(oldPosX, oldPosY, posX, posY, - (overcutLength - self.overcut))
self.processOffset(cmd, newLength[0], newLength[1])
break
else:
self.processOffset(cmd, posX, posY)
oldPosX = posX
oldPosY = posY
self.processOffset('PU', 0, 0)
if len(self.curPath) > 1:
self.paths.append(self.curPath)
return self.paths
if __name__ == '__main__':
paths = [[(0,0),(20,0),(20,20),(0,20),(0,0)], [(0,0),(20,0),(20,20),(0,20),(0,0)]]
op = OffsetProcessor()
print(op.processPath(paths))
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