thandxflin.py :  » Business-Application » ThanCad » thancad-0.0.9 » p_gdxf » Python Open Source

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Python Open Source » Business Application » ThanCad 
ThanCad » thancad 0.0.9 » p_gdxf » thandxflin.py
# -*- coding: iso-8859-7 -*-

#############################################################################
#############################################################################

from math import hypot
PLINECLOSED   = 1
PLINE3        = 8
PLINEVERTEX3  = 32
PLINEWHOKNOWS = 128

class ThanDxfLin:
    "Mixin to export lines to .dxf file."
  
#===========================================================================

    def __init__(self):
        "Some Initialisation for polyvertex."
  self.__firstVertex = 1
  
#===========================================================================

    def thanDxfPlotLine(self, xp, yp):
        "Plots many line segments."
        p = self.thanDxfPlot
        p(xp[0], yp[0], 3)
        for i in xrange(1, len(xp)): p(xp[i], yp[i], 2)

#===========================================================================

    def thanDxfPlotLine3 (self, xp, yp, zp):
        "Plots many 3d line segments."
        p = self.thanDxfPlot3
        p(xp[0], yp[0], zp[0], 3)
        for i in xrange(1, len(xp)): p(xp[i], yp[i], zp[i], 2)

#===========================================================================

    def thanDxfPlotPolyline (self, xgram, ygram):
        "Plots a 2d polyline."
        ig = len(xgram)
        if ig < 2: return

        self.thanDxfWrEntry(0, 'POLYLINE')
        self.thanDxfWrLinatts()

        (px, py) = self.thanDxfTop(xgram[0], ygram[0])
        self.thanDxfWrEntry(66, 1)
        self.thanDxfWrXy(px, py)
        self.thanDxfWrEntry(70, PLINEWHOKNOWS)
  
  w = self.thanPlineWidth
  if w != (0.0, 0.0):
            self.thanDxfWrEntry(40, w[0])
            self.thanDxfWrEntry(41, w[1])
  
        for i in xrange(ig):
            (px, py) = self.thanDxfTop(xgram[i], ygram[i])
            self.thanDxfWrEntry(0, 'VERTEX')
            self.thanDxfWrLinatts()
            self.thanDxfWrXy(px, py)

        self.thanDxfWrEntry(0, 'SEQEND')

#===========================================================================

    def thanDxfPlotPolyline3 (self, xgram, ygram, zgram):
        "Plots a 3d polyline."
        ig = len(xgram)
        if ig < 2: return

        self.thanDxfWrEntry(0, 'POLYLINE')
        self.thanDxfWrLinatts()

        (px, py, pz) = self.thanDxfTop3(xgram[0], ygram[0], zgram[0])
        self.thanDxfWrEntry(66, 1)
        self.thanDxfWrXyz(px, py, pz)
        self.thanDxfWrEntry(70, PLINE3)

        w = self.thanPlineWidth
  if w != (0.0, 0.0):
            self.thanDxfWrEntry(40, w[0])
            self.thanDxfWrEntry(41, w[1])

        for i in xrange(ig):
            (px, py, pz) = self.thanDxfTop3(xgram[i], ygram[i], zgram[i])
            self.thanDxfWrEntry(0, 'VERTEX')
            self.thanDxfWrLinatts()
            self.thanDxfWrXyz(px, py, pz)
            self.thanDxfWrEntry(70, PLINEVERTEX3)

        self.thanDxfWrEntry(0, 'SEQEND')

#===========================================================================

    def thanDxfPlotPolyVertex (self, xx, yy, ic, bulge=None):
        "Plots a 2d polyline, vertex by vertex."
  
#-------polyline beginning-----------------------------------------

        if self.__firstVertex:
            self.thanDxfWrEntry(0, 'POLYLINE')
            self.thanDxfWrLinatts()

            (px, py) = self.thanDxfTop(xx, yy)
            self.thanDxfWrEntry(66, 1)
            self.thanDxfWrXy(px, py)
            self.thanDxfWrEntry(70, PLINEWHOKNOWS)

      w = self.thanPlineWidth
      if w != (0.0, 0.0):
                self.thanDxfWrEntry(40, w[0])
                self.thanDxfWrEntry(41, w[1])
      if bulge != None:
                self.thanDxfWrEntry(42, bulge)

            self.thanDxfWrEntry(0, 'VERTEX')
            self.thanDxfWrLinatts()
            self.thanDxfWrXy(px, py)
  
            self.__firstVertex = 0

#-------polyline end----------------------------------------

        elif ic >= 999:
            self.thanDxfWrEntry(0, 'SEQEND')
            self.__firstVertex = 1
            return

#-------polyline point---------------------------------------

        else:
            (px, py) = self.thanDxfTop (xx, yy)
            self.thanDxfWrEntry(0, 'VERTEX')
            self.thanDxfWrLinatts()
            self.thanDxfWrXy(px, py)

            w = self.thanPlineWidth
      if w != (0.0, 0.0):
                self.thanDxfWrEntry(40, w[0])
                self.thanDxfWrEntry(41, w[1])
      if bulge != None:
                self.thanDxfWrEntry(42, bulge)

#==========================================================================

    def thanDxfPlotPolyVertex3 (self, xx, yy, zz, ic):
        "Plots a 3d polyline, vertex by vertex."
  
#-------polyline beginning-----------------------------------------

        if self.__firstVertex:
            self.thanDxfWrEntry(0, 'POLYLINE')
            self.thanDxfWrLinatts()

            (px, py, pz) = self.thanDxfTop3(xx, yy, zz)
            self.thanDxfWrEntry(66, 1)
            self.thanDxfWrXyz(px, py, pz)
            self.thanDxfWrEntry(70, PLINE3)

      w = self.thanPlineWidth
      if w != (0.0, 0.0):
                self.thanDxfWrEntry(40, w[0])
                self.thanDxfWrEntry(41, w[1])

            self.thanDxfWrEntry(0, 'VERTEX')
            self.thanDxfWrLinatts()
            self.thanDxfWrXyz(px, py, pz)
            self.thanDxfWrEntry(70, PLINEVERTEX3)

            self.__firstVertex = 0

#-------polyline end----------------------------------------

        elif ic >= 999:
            self.thanDxfWrEntry(0, 'SEQEND')
            self.__firstVertex = 1
            return

#-------polyline point---------------------------------------

        else:
            (px, py, pz) = self.thanDxfTop3(xx, yy, zz)
            self.thanDxfWrEntry(0, 'VERTEX')
            self.thanDxfWrLinatts()
            self.thanDxfWrXyz(px, py, pz)
            self.thanDxfWrEntry(70, PLINEVERTEX3)

            w = self.thanPlineWidth
      if w != (0.0, 0.0):
                self.thanDxfWrEntry(40, w[0])
                self.thanDxfWrEntry(41, w[1])

#===========================================================================

    def thanDxfPlotLinebox (self, xx, yy, bb, hh):
        "Plots a 2d rectangle."

#-------Plot line

        xx1 = xx + bb
        yy1 = yy + hh

        self.thanDxfPolyVertex (xx,  xy,  2)
  self.thanDxfPolyVertex (xx1, xy,  2)
        self.thanDxfPolyVertex (xx1, xy1, 2)
        self.thanDxfPolyVertex (xx,  xy1, 2)
        self.thanDxfPolyVertex (xx,  xy,  2)
        self.thanDxfPolyVertex (0.0, 0.0, 999)

#===========================================================================

    def thanDxfPlot(self, xx, yy, icom):
        "Plots a line from previous point to this and some housekeeping."
  
#-------Check if end

        ic = abs(icom)
        if ic == 1000 or ic == 999:
            self.thanDxfWrEntry(0, 'ENDSEC')
            self.thanDxfWrEntry(0, 'EOF')
            self.thanFdxf.close()
            return

#-------Plot line

        if ic == 1: ic = self.thanIpen
        self.thanIpen = ic
        (px, py) = self.thanDxfTop(xx, yy)
        if ic == 2:
            self.thanDxfWrEntry(0, "LINE")
            self.thanDxfWrLinatts()
            self.thanDxfWrXy(self.thanPXnow, self.thanPYnow)
            self.thanDxfWrXy1(px, py)
  
        self.thanPXnow = px
        self.thanPYnow = py

#-------Check if begative

        if icom < 0: self.thanDxfLocref(0.0, 0.0, 0.0, 0.0)

#===========================================================================

    thanDxfPlot10 = thanDxfPlot    # For comp[atibility; see the folowwing function

    def thanDxfPlot10a(uDxf, x, y, ipen):
      """Plots or moves the pen with 10cm steps.
      
      This code is for fast old pen plotters (e.g. CIL). If the distanmce to
      move or plot is big (e.g. 1m and more) the plotter is moving the drum
      very fast. This either ruptures the paper or causes the pen not write.
      Here we move the pen with 10cm steps, so that the drum does not have the
      time to accelerate to high speed.
      It also addresses a problem with 2bytes integers (whose biggest value
      is 32767) which were used by the old CIL plotter. A call to locref
      initialises the origin and keeps the numbers x and y small inside the CIL
      plotter.
      Note that when ipen=2 and the pen is already down, the plotter stil tries
      to move it down, which weras off the pen. Hence the hack with ipen1=1.
      The value 1 in ipen, does not change the verical position of the pen (up
      or down).
      This code was written in Fortran IV around 1982, in the 550 Prime
      computer.
      """ 
      ipen1=ipen
      x2, y2 = uDxf.thanDxfPlotWhere()
      dis=hypot(x-x2, y-y2)
      if dis>10.0:  # go to 2
          k=int(dis/10.0)
          dx=(x-x2)*10.0/dis
          dy=(y-y2)*10.0/dis
          for i in xrange(k):
              x2 += dx
              y2 += dy
              uDxf.thanDxfPlot(x2, y2, ipen1)
              uDxf.thanDxfLocref(x2, y2, 1.0, 1.0)
              ipen1=1
      uDxf.thanDxfPlot(x,y,ipen1)
      uDxf.thanDxfLocref (x,y,1.0,1.0)

#===========================================================================

    def thanDxfPlot3(self, xx, yy, zz, icod):
        "Plots a 3D line from previous point to this."

#-------Plot line

        ic = abs(icod)
        if ic == 1: ic = self.thanIpen
        self.thanIpen = ic
        (px, py, pz) = self.thanDxfTop3(xx, yy, zz)
        if ic == 2:
            self.thanDxfWrEntry(0, "LINE")
            self.thanDxfWrLinatts()
            self.thanDxfWrXyz(self.thanPXnow, self.thanPYnow, self.thanPZnow)
            self.thanDxfWrXyz1(px, py, pz)
  
        self.thanPXnow = px
        self.thanPYnow = py
        self.thanPZnow = pz

#############################################################################
#############################################################################

#MODULE LEVEL FUNCTIONS


#############################################################################
#############################################################################

#MODULE LEVEL CODE. IT IS EXECUTED ONLY ONCE

if __name__ == "__main__":
    dxf = ThanDxfLin()
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