import math, string

import bezmisc, cspsubdiv, cubicsuperpath, inkex, simplestyle, simpletransform

class hpglEncoder:

def __init__(self, doc, options):

''' options:

self.doc = doc

self.options = options

self.divergenceX = 'False' # dirty hack: i need to know if this was set before, but since False is evaluated to 0 it can not be determined, therefore the string.

self.divergenceY = 'False'

self.sizeX = 'False'

self.sizeY = 'False'

self.dryRun = True

self.scaleX = self.options.resolutionX / 90 # inch to pixels

self.scaleY = self.options.resolutionY / 90 # inch to pixels

self.options.offsetX = self.options.offsetX * 3.5433070866 * self.scaleX # mm to dots (plotter coordinate system)

self.options.offsetY = self.options.offsetY * 3.5433070866 * self.scaleY # mm to dots

self.options.overcut = self.options.overcut * 3.5433070866 * ((self.scaleX + self.scaleY) / 2) # mm to dots

self.options.toolOffset = self.options.toolOffset * 3.5433070866 * ((self.scaleX + self.scaleY) / 2) # mm to dots

self.options.flat = ((self.options.resolutionX + self.options.resolutionY) / 2) * self.options.flat / 1000 # scale flatness to resolution

self.mirrorX = 1.0

if self.options.mirrorX:

self.mirrorX = -1.0

self.mirrorY = -1.0

if self.options.mirrorY:

self.mirrorY = 1.0

# process viewBox parameter to correct scaling

viewBox = doc.get('viewBox')

self.viewBoxTransformX = 1

self.viewBoxTransformY = 1

if viewBox:

viewBox = string.split(viewBox, ' ')

if viewBox[2] and viewBox[3]:

self.viewBoxTransformX = float(inkex.unittouu(doc.get('width'))) / float(viewBox[2])

self.viewBoxTransformY = float(inkex.unittouu(doc.get('height'))) / float(viewBox[3])

def getHpgl(self):

# dryRun to find edges

self.groupmat = [[[self.mirrorX * self.scaleX * self.viewBoxTransformX, 0.0, 0.0], [0.0, self.mirrorY * self.scaleY * self.viewBoxTransformY, 0.0]]]

self.groupmat[0] = simpletransform.composeTransform(self.groupmat[0], simpletransform.parseTransform('rotate(' + self.options.orientation + ')'))

self.vData = [['', -1.0, -1.0], ['', -1.0, -1.0], ['', -1.0, -1.0], ['', -1.0, -1.0]]

self.process_group(self.doc, self.groupmat)

if self.divergenceX == 'False' or self.divergenceY == 'False' or self.sizeX == 'False' or self.sizeY == 'False':

raise Exception('NO_PATHS')

# live run

self.dryRun = False

if self.options.center:

self.divergenceX += (self.sizeX - self.divergenceX) / 2

self.divergenceY += (self.sizeY - self.divergenceY) / 2

elif self.options.useToolOffset:

self.options.offsetX += self.options.toolOffset

self.options.offsetY += self.options.toolOffset

self.groupmat = [[[self.mirrorX * self.scaleX * self.viewBoxTransformX, 0.0, -self.divergenceX + self.options.offsetX], [0.0, self.mirrorY * self.scaleY * self.viewBoxTransformY, -self.divergenceY + self.options.offsetY]]]

self.groupmat[0] = simpletransform.composeTransform(self.groupmat[0], simpletransform.parseTransform('rotate(' + self.options.orientation + ')'))

self.vData = [['', -1.0, -1.0], ['', -1.0, -1.0], ['', -1.0, -1.0], ['', -1.0, -1.0]]

# store first hpgl commands

self.hpgl = 'IN;SP%d;' % self.options.pen

# add precut

if self.options.useToolOffset and self.options.precut:

self.calcOffset('PU', 0, 0)

self.calcOffset('PD', 0, self.options.toolOffset * self.options.toolOffsetReturn * 2)

# start conversion

self.process_group(self.doc, self.groupmat)

# shift an empty node in in order to process last node in cache

self.calcOffset('PU', 0, 0)

# add return to zero point

self.hpgl += 'PU0,0;'

return self.hpgl

def process_group(self, group, groupmat):

# process groups

style = group.get('style')

if style:

style = simplestyle.parseStyle(style)

if style.has_key('display'):

if style['display'] == 'none':

return

trans = group.get('transform')

if trans:

groupmat.append(simpletransform.composeTransform(groupmat[-1], simpletransform.parseTransform(trans)))

for node in group:

if node.tag == inkex.addNS('path', 'svg'):

self.process_path(node, groupmat[-1])

if node.tag == inkex.addNS('g', 'svg'):

self.process_group(node, groupmat)

def process_path(self, node, mat):

# process path

# TODO:2013-07-13:Sebastian Wüst:Find better variable names.

d = node.get('d')

if d:

# transform path

p = cubicsuperpath.parsePath(d)

trans = node.get('transform')

if trans:

mat = simpletransform.composeTransform(mat, simpletransform.parseTransform(trans))

simpletransform.applyTransformToPath(mat, p)

cspsubdiv.cspsubdiv(p, self.options.flat)

# break path into HPGL commands

# TODO:2013-07-13:Sebastian Wüst:Somehow make this more readable.

xPosOld = -1

yPosOld = -1

for sp in p:

cmd = 'PU'

for csp in sp:

xPos = csp[1][0]

yPos = csp[1][1]

if int(xPos) != int(xPosOld) or int(yPos) != int(yPosOld):

self.calcOffset(cmd, xPos, yPos)

cmd = 'PD'

xPosOld = xPos

yPosOld = yPos

# perform overcut

if self.options.useOvercut and not self.dryRun:

if int(xPos) == int(sp[0][1][0]) and int(yPos) == int(sp[0][1][1]):

for csp in sp:

xPos2 = csp[1][0]

yPos2 = csp[1][1]

if int(xPos) != int(xPos2) or int(yPos) != int(yPos2):

self.calcOffset(cmd, xPos2, yPos2)

if self.options.overcut - self.getLength(xPosOld, yPosOld, xPos2, yPos2) <= 0:

break

xPos = xPos2

yPos = yPos2

# TODO:2013-07-13:Sebastian Wüst:Find methods from the existing classes to replace the next 4 methods.

def getLength(self, x1, y1, x2, y2, abs = True):

# calc absoulute or relative length between two points

if abs: return math.fabs(math.sqrt((x2 - x1) ** 2.0 + (y2 - y1) ** 2.0))

else: return math.sqrt((x2 - x1) ** 2.0 + (y2 - y1) ** 2.0)

def changeLengthX(self, x1, y1, x2, y2, offset):

# change length of line - x axis

if offset < 0: offset = max(-self.getLength(x1, y1, x2, y2), offset)

return x2 + (x2 - x1) / self.getLength(x1, y1, x2, y2, False) * offset;

def changeLengthY(self, x1, y1, x2, y2, offset):

# change length of line - y axis

if offset < 0: offset = max(-self.getLength(x1, y1, x2, y2), offset)

return y2 + (y2 - y1) / self.getLength(x1, y1, x2, y2, False) * offset;

def getAlpha(self, x1, y1, x2, y2, x3, y3):

# get alpha of point 2

temp1 = (x1-x2)**2 + (y1-y2)**2 + (x3-x2)**2 + (y3-y2)**2 - (x1-x3)**2 - (y1-y3)**2

temp2 = 2 * math.sqrt((x1-x2)**2 + (y1-y2)**2) * math.sqrt((x3-x2)**2 + (y3-y2)**2)

temp3 = temp1 / temp2

if temp3 < -1.0:

temp3 = -1.0

if temp3 > 1.0:

temp3 = 1.0

return math.acos(temp3)

def calcOffset(self, cmd, xPos, yPos):

# calculate offset correction (or dont)

if not self.options.useToolOffset or self.dryRun:

self.storeData(cmd, xPos, yPos)

else:

# insert data into cache

self.vData.pop(0)

self.vData.insert(3, [cmd, xPos, yPos])

# decide if enough data is availabe

if self.vData[2][1] != -1.0:

if self.vData[1][1] == -1.0:

self.storeData(self.vData[2][0], self.vData[2][1], self.vData[2][2])

else:

# check if tool offset correction is needed (if the angle is big enough)

if self.vData[2][0] == 'PD' and self.vData[3][0] == 'PD':

if self.getAlpha(self.vData[1][1], self.vData[1][2], self.vData[2][1], self.vData[2][2], self.vData[3][1], self.vData[3][2]) > 2.748893:

self.storeData(self.vData[2][0], self.vData[2][1], self.vData[2][2])

return

# 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

pointThreeX = self.changeLengthX(self.vData[1][1], self.vData[1][2], self.vData[2][1], self.vData[2][2], self.options.toolOffset)

pointThreeY = self.changeLengthY(self.vData[1][1], self.vData[1][2], self.vData[2][1], self.vData[2][2], self.options.toolOffset)

self.storeData('PD', pointThreeX, pointThreeY)

elif self.vData[0][1] != -1.0: # Elif the 1st entry in the cache is filled with data shift the 3rd entry by the current tool offset position according to the 2nd command

pointThreeX = self.vData[2][1] - (self.vData[1][1] - self.changeLengthX(self.vData[0][1], self.vData[0][2], self.vData[1][1], self.vData[1][2], self.options.toolOffset))

pointThreeY = self.vData[2][2] - (self.vData[1][2] - self.changeLengthY(self.vData[0][1], self.vData[0][2], self.vData[1][1], self.vData[1][2], self.options.toolOffset))

self.storeData('PU', pointThreeX, pointThreeY)

else: # Else just write the 3rd entry to HPGL

pointThreeX = self.vData[2][1]

pointThreeY = self.vData[2][2]

self.storeData('PU', pointThreeX, pointThreeY)

if self.vData[3][0] == 'PD': # If the 4th entry in the cache is a pen down command

# TODO:2013-07-13:Sebastian Wüst:Either remove old method or make it selectable by parameter.

if 1 == 1:

pointFourX = self.changeLengthX(self.vData[3][1], self.vData[3][2], self.vData[2][1], self.vData[2][2], -(self.options.toolOffset * self.options.toolOffsetReturn))

pointFourY = self.changeLengthY(self.vData[3][1], self.vData[3][2], self.vData[2][1], self.vData[2][2], -(self.options.toolOffset * self.options.toolOffsetReturn))

self.storeData('PD', pointFourX, pointFourY)

else:

# Create a circle between 3rd and 4th entry to correctly guide the tool around the corner

pointFourX = self.changeLengthX(self.vData[3][1], self.vData[3][2], self.vData[2][1], self.vData[2][2], -self.options.toolOffset)

pointFourY = self.changeLengthY(self.vData[3][1], self.vData[3][2], self.vData[2][1], self.vData[2][2], -self.options.toolOffset)

# TODO:2013-07-13:Sebastian Wüst:Fix that sucker! (number of points in the circle has to be calculated)

alpha1 = math.atan2(pointThreeY - self.vData[2][2], pointThreeX - self.vData[2][1])

alpha2 = math.atan2(pointFourY - self.vData[2][2], pointFourX - self.vData[2][1])

step = (2 * math.pi - math.fabs(alpha2 - alpha1)) * 6 + 1

#inkex.errormsg(str(alpha1) + ' | ' + str(alpha2))

for alpha in range(int(step), 101, int(step)):

alpha = alpha1 + alpha * (alpha2 - alpha1) / 100

self.storeData('PD', self.vData[2][1] + math.cos(alpha) * self.options.toolOffset, self.vData[2][2] + math.sin(alpha) * self.options.toolOffset)

self.storeData('PD', pointFourX, pointFourY)

def storeData(self, command, x, y):

# store point

if self.dryRun:

if self.divergenceX == 'False' or x < self.divergenceX: self.divergenceX = x

if self.divergenceY == 'False' or y < self.divergenceY: self.divergenceY = y

if self.sizeX == 'False' or x > self.sizeX: self.sizeX = x

if self.sizeY == 'False' or y > self.sizeY: self.sizeY = y

else:

if not self.options.center:

if x < 0: x = 0 # only positive values are allowed (usually)

if y < 0: y = 0

self.hpgl += '%s%d,%d;' % (command, x, y)