io_import_scene_dxf.py

        print("VERTS")
        for v in self.verts:
            print(v.location)
        print("END VERTS")

    def build(self, vn=0):
        verts = []
        lines = []
        v_start = vn
        for vert in self.verts:
            verts.append(vert.location)
            lines.append((vn, vn+1))
            vn += 1
        if self.flags & PL_CLOSED:
            lines[-1] = (vn-1, v_start)
        else:
            lines.pop()
        if self.normal!=Vector((0,0,1)):
            ma = getOCS(self.normal)
            if ma:
                verts = [ma * v for v in verts]
        return((verts, lines, [], vn-1))

#
#    class CShape(CEntity):
#    2 : 'name', 
#    10 : 'insertion_point.x', 20 : 'insertion_point.y', 30 : 'insertion_point.z', 
#    39 : 'thickness',
#    40 : 'size', 41 : 'x_scale', 
#    50 : 'rotation_angle', 51 : 'oblique_angle',     
#

class CShape(CEntity):
    def __init__(self):
        CEntity.__init__(self, 'SHAPE', None)
        self.name = ""
        self.insertion_point = Vector()
        self.thickness = 0.0
        self.size = 1.0
        self.x_scale = 1.0
        self.rotation_angle = 0.0
        self.oblique_angle = 0.0

    def display(self):
        CEntity.display(self)
        print("%s" % (self.name))
        print(self.insertion_point)

#
#    class CSpline(CEntity):
#    10 : ['new_control_point(data)'], 20 : 'control_point.y', 30 : 'control_point.z', 
#    11 : ['new_fit_point(data)'], 21 : 'fit_point.y', 31 : 'fit_point.z', 
#    40 : ['new_knot_value(data)'], 
#    12 : 'start_tangent.x', 22 : 'start_tangent.y', 32 : 'start_tangent.z', 
#    13 : 'end_tangent.x', 23 : 'end_tangent.y', 33 : 'end_tangent.z', 
#    41 : 'weight', 42 : 'knot_tol', 43 : 'control_point_tol', 44 : 'fit_tol',
#    70 : 'flag', 71 : 'degree', 
#    72 : 'num_knots', 73 : 'num_control_points', 74 : 'num_fit_points',
#    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
#

class CSpline(CEntity):
    def __init__(self):
        CEntity.__init__(self, 'SPLINE', 'Mesh')
        self.control_points = []
        self.fit_points = []
        self.knot_values = []
        self.control_point = None
        self.fit_point = None
        self.knot_value = None
        self.start_tangent = Vector()
        self.end_tangent = Vector()
        self.weight = 1.0
        self.knot_tol = 1e-6
        self.control_point_tol = 1e-6
        self.fit_tol = 1e-6
        self.flag = 0
        self.degree = 3
        self.num_knots = 0
        self.num_control_points = 0
        self.num_fit_points = 0
        self.thickness = 0.0
        self.normal = Vector((0,0,1))
        
    def new_control_point(self, data):
        self.control_point = Vector()
        self.control_point.x = data
        self.control_points.append(self.control_point)
        
    def new_fit_point(self, data):
        self.fit_point = Vector()
        self.fit_point.x = data
        self.fit_points.append(self.fit_point)

    def new_knot_value(self, data):
        self.knot_value = data
        self.knot_values.append(self.knot_value)
        
    def display(self):
        #not testet yet (migius)
        CEntity.display(self)
        print("CONTROL")
        for p in self.control_points:
            print(p)
        print("FIT")
        for p in self.fit_points:
            print(p)
        print("KNOT")
        for v in self.knot_values:
            print(v)

    def build(self, vn=0):
        verts = []
        lines = []
        for vert in self.control_points:
            verts.append(vert)
            lines.append((vn, vn+1))
            vn += 1
        lines.pop()
        return((verts, lines, [], vn))


#
#    class CSolid(CEntity):
#    10 : 'point0.x', 20 : 'point0.y', 30 : 'point0.z', 
#    11 : 'point1.x', 21 : 'point1.y', 31 : 'point1.z', 
#    12 : 'point2.x', 22 : 'point2.y', 32 : 'point2.z', 
#    13 : 'point3.x', 23 : 'point3.y', 33 : 'point3.z', 
#    39 : 'thickness',
#

class CSolid(CEntity):
    def __init__(self):
        CEntity.__init__(self, 'SOLID', 'Mesh')
        self.point0 = Vector()
        self.point1 = Vector()
        self.point2 = Vector()
        self.point3 = Vector()
        self.normal = Vector((0,0,1))
        self.thickness = 0.0
        
    def display(self):
        CEntity.display(self)
        print(self.point0)
        print(self.point1)
        print(self.point2)
        print(self.point3)

    def build(self, vn=0):
        points, edges, faces = [],[],[]
        if self.point2 == self.point3:
            points = [self.point0, self.point1, self.point2]
        else:
            points = [self.point0, self.point1, self.point2, self.point3]
        pn = len(points)
        v0 = vn
        
        thic = self.thickness
        t_vector = Vector((0, 0, thic))
        if thic != 0 and (toggle & T_ThicON):
            thic_points = [v + t_vector for v in points]
            if thic < 0.0:
                thic_points.extend(points)
                points = thic_points
            else:
                points.extend(thic_points)

            if   pn == 4:
                faces = [[0,1,3,2], [4,6,7,5], [0,4,5,1],
                         [1,5,7,3], [3,7,6,2], [2,6,4,0]]
            elif pn == 3:
                faces = [[0,1,2], [3,5,4], [0,3,4,1], [1,4,5,2], [2,5,3,0]]
            elif pn == 2: faces = [[0,1,3,2]]
            vn += 2*pn
        else:
            if   pn == 4: faces = [[0,2,3,1]]
            elif pn == 3: faces = [[0,2,1]]
            elif pn == 2:
                edges = [[0,1]]
                self.drawtype = 'Mesh'
            vn += pn
        if self.normal!=Vector((0,0,1)):
            ma = getOCS(self.normal)
            if ma:
                points = [ma * v for v in points]
        return((points, edges, faces, vn))
        
#
#    class CText(CEntity):
#    1 : 'text', 7 : 'style',
#    10 : 'insertion_point.x', 20 : 'insertion_point.y', 30 : 'insertion_point.z', 
#    11 : 'alignment_point.x', 21 : 'alignment_point.y', 31 : 'alignment_point.z', 
#    40 : 'height', 41 : 'x_scale', 
#    50 : 'rotation_angle', 51 : 'oblique_angle', 
#    71 : 'flags', 72 : 'horizontal_justification',  73 : 'vertical_justification',    
#

class CText(CEntity):
    def __init__(self):
        CEntity.__init__(self, 'TEXT', 'Text')
        self.text = ""
        self.style = ""
        self.insertion_point = Vector()
        self.alignment_point = Vector()
        self.height = 1.0
        self.x_scale = 1.0
        self.rotation_angle = 0.0
        self.oblique_angle = 0.0
        self.flags = 0
        self.horizontal_justification = 0.0
        self.vertical_justification = 0.0
        self.thickness = 0.0
        self.normal = Vector((0,0,1))
       
    def display(self):
        CEntity.display(self)
        print("%s %s" % (self.text, self.style))
        print(self.insertion_point)
        print(self.alignment_point)
        
    def draw(self):
        drawText(self.text,  self.insertion_point, self.height, self.x_scale, self.rotation_angle, self.oblique_angle, self.normal)
        return


def drawText(text, loc, size, spacing, angle, shear, normal=Vector((0,0,1))):
    #print('angle_deg=',angle)
    bpy.ops.object.text_add(
        view_align=False, 
        enter_editmode=False, 
        location= loc, 
        #rotation=(0, 0, angle), #need radians here
        )
    cu = bpy.context.object.data
    cu.body = text
    cu.size = size #up 2.56
    cu.space_word = spacing #up 2.56
    cu.shear = shear
    if angle!=0.0 or normal!=Vector((0,0,1)):
        obj = bpy.context.object
        transform(normal, angle, obj)
    return

#
#    class CTolerance(CEntity):
#    3 : 'style',
#    10 : 'insertion_point.x', 20 : 'insertion_point.y', 30 : 'insertion_point.z', 
#    11 : 'direction.x', 21 : 'direction.y', 31 : 'direction.z', 
#

class CTolerance(CEntity):
    def __init__(self):
        CEntity.__init__(self, 'TOLERANCE', None)
        self.stype = ""
        self.insertion_point = Vector()
        self.direction = Vector()

#
#    class CTrace(CEntity):
#    10 : 'point0.x', 20 : 'point0.y', 30 : 'point0.z', 
#    11 : 'point1.x', 21 : 'point1.y', 31 : 'point1.z', 
#    12 : 'point2.x', 22 : 'point2.y', 32 : 'point2.z', 
#    13 : 'point3.x', 23 : 'point3.y', 33 : 'point3.z', 
#    39 : 'thickness',
#

class CTrace(CEntity):
    def __init__(self):
        CEntity.__init__(self, 'TRACE', 'Mesh')
        self.point0 = Vector()
        self.point1 = Vector()
        self.point2 = Vector()
        self.point3 = Vector()
        self.normal = Vector((0,0,1))
        self.thickness = 0.0
    
    def display(self):
        CEntity.display(self)
        print(self.point0)
        print(self.point1)
        print(self.point2)
        print(self.point3)
   
    def build(self, vn=0):
        points, edges, faces = [],[],[]
        if self.point2 == self.point3:
            points = [self.point0, self.point2, self.point1]
        else:
            points = [self.point0, self.point2, self.point1, self.point3]
        pn = len(points)
        v0 = vn
        thic = self.thickness
        t_vector = Vector((0, 0, thic))
        if thic != 0 and (toggle & T_ThicON):
            thic_points = [v + t_vector for v in points]
            if thic < 0.0:
                thic_points.extend(points)
                points = thic_points
            else:
                points.extend(thic_points)

            if   pn == 4:
                faces = [[0,1,3,2], [4,6,7,5], [0,4,5,1],
                         [1,5,7,3], [3,7,6,2], [2,6,4,0]]
            elif pn == 3:
                faces = [[0,1,2], [3,5,4], [0,3,4,1], [1,4,5,2], [2,5,3,0]]
            elif pn == 2: faces = [[0,1,3,2]]
            vn += 2*pn
        else:
            if   pn == 4: faces = [[0,2,3,1]]
            elif pn == 3: faces = [[0,2,1]]
            elif pn == 2:
                edges = [[0,1]]
                self.drawtype = 'Mesh'
        if self.normal!=Vector((0,0,1)):
            ma = getOCS(self.normal)
            if ma:
                points = [ma * v for v in points]
        return ((points, edges, faces, vn))

#
#    class CVertex(CEntity):
#    10 : 'location.x', 20 : 'location.y', 30 : 'location.z', 
#    40 : 'start_width', 41 : 'end_width', 42 : 'bulge', 
#    50 : 'tangent',
#    70 : 'flags',
#    71 : 'index1', 72 : 'index2', 73 : 'index3', 74 : 'index4', 
#

class CVertex(CEntity):
    def __init__(self):
        CEntity.__init__(self, 'VERTEX', None)
        self.location = Vector()
        self.start_width = 0.0
        self.end_width = 0.0
        self.bulge = 0.0
        self.tangent = 0.0
        self.flags = 0

    def display(self):
        return

    def draw(self):
        return

#            
#    class CViewPort(CEntity):
#    10 : 'center.x', 20 : 'center.y', 30 : 'center.z', 
#    12 : 'view_center.x', 22 : 'view_center.y', 32 : 'view_center.z', 
#    13 : 'snap_base.x', 23 : 'snap_base.y', 33 : 'snap_base.z', 
#    14 : 'snap_spacing.x', 24 : 'snap_spacing.y', 34 : 'snap_spacing.z', 
#    15 : 'grid_spacing.x', 25 : 'grid_spacing.y', 35 : 'grid_spacing.z', 
#    16 : 'view_direction.x', 26 : 'view_direction.y', 36 : 'view_direction.z', 
#    40 : 'width', 41 : 'height',
#    68 : 'status', 69 : 'id',
#

class CViewPort(CEntity):
    def __init__(self):
        CEntity.__init__(self, 'VIEWPORT', None)
        self.center = Vector()
        self.view_center = Vector()
        self.snap_base = Vector()
        self.snap_spacing = Vector()
        self.grid_spacing = Vector()
        self.view_direction = Vector()
        self.width = 1.0
        self.height = 1.0
        self.status = 0
        self.id = 0

    def draw(self):
        # Todo
        return

#
#    class CWipeOut(CEntity):
#    10 : 'point.x', 20 : 'point.y', 30 : 'point.z', 
#    11 : 'direction.x', 21 : 'direction.y', 31 : 'direction.z', 
#

class CWipeOut(CEntity):
    def __init__(self):
        CEntity.__init__(self, 'WIPEOUT', None)
        self.point = Vector()
        self.direction = Vector()

#
#
#
WORLDX = Vector((1.0,0.0,0.0))
WORLDY = Vector((0.0,1.0,0.0))
WORLDZ = Vector((0.0,0.0,1.0))


def getOCS(az):  #-----------------------------------------------------------------
    """An implimentation of the Arbitrary Axis Algorithm.
    """
    #decide if we need to transform our coords
    #if az[0] == 0 and az[1] == 0: 
    if abs(az.x) < 0.00001 and abs(az.y) < 0.00001:
        if az.z > 0.0:
            return False
        elif az.z < 0.0:
            return Matrix((-WORLDX, WORLDY*1, -WORLDZ)).transposed()

    cap = 0.015625 # square polar cap value (1/64.0)
    if abs(az.x) < cap and abs(az.y) < cap:
        ax = WORLDY.cross(az)
    else:
        ax = WORLDZ.cross(az)
    ax.normalize()
    ay = az.cross(ax)
    ay.normalize()
    # Matrices are now constructed from rows, transpose to make the rows into cols
    return Matrix((ax, ay, az)).transposed()



def transform(normal, rotation, obj):  #--------------------------------------------
    """Use the calculated ocs to determine the objects location/orientation in space.
    """
    ma = Matrix()
    o = Vector(obj.location)
    ma_new = getOCS(normal)
    if ma_new:
        ma_new.resize_4x4()
        ma = ma_new
        o = ma * o

    if rotation != 0:
        rmat = Matrix.Rotation(radians(rotation), 4, 'Z')
        ma = ma * rmat

    obj.matrix_world = ma
    obj.location = o


DxfEntityAttributes = {
'3DFACE'    : {
    10 : 'point0.x', 20 : 'point0.y', 30 : 'point0.z', 
    11 : 'point1.x', 21 : 'point1.y', 31 : 'point1.z', 
    12 : 'point2.x', 22 : 'point2.y', 32 : 'point2.z', 
    13 : 'point3.x', 23 : 'point3.y', 33 : 'point3.z', 
    70 : 'flags',
    },

'3DSOLID'    : {
    1 : 'data', 3 : 'more', 70 : 'version',
    },

'ACAD_PROXY_ENTITY'    : {
    70 : 'format',
    90 : 'id', 91 : 'class', 92 : 'graphics_size', 93 : 'entity_size', 95: 'format',
    310 : 'data', 330 : 'id1', 340 : 'id2', 350 : 'id3', 360 : 'id4', 
    },

'ARC'        : {
    10 : 'center.x', 20 : 'center.y', 30 : 'center.z', 
    40 : 'radius',
    50 : 'start_angle', 51 : 'end_angle',
    39 : 'thickness',
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },

'ARCALIGNEDTEXT'    : {
    1 : 'text', 2 : 'font', 3 : 'bigfont', 7 : 'style',
    10 : 'center.x', 20 : 'center.y', 30 : 'center.z', 
    40 : 'radius', 41 : 'width', 42 : 'height', 43 : 'spacing', 
    44 : 'offset', 45 : 'right_offset', 46 : 'left_offset', 
    50 : 'start_angle', 51 : 'end_angle',
    70 : 'order', 71 : 'direction', 72 : 'alignment', 73 : 'side', 
    74 : 'bold', 75 : 'italic', 76 : 'underline',
    77 : 'character_set', 78 : 'pitch', 79 : 'fonttype',
    90 : 'color',
    280 : 'wizard', 330 : 'id'
    },

'ATTDEF'    : {
    1 : 'text', 2 : 'tag', 3 : 'prompt', 7 : 'style',
    10 : 'insertion_point.x', 20 : 'insertion_point.y', 30 : 'insertion_point.z', 
    11 : 'alignment_point.x', 21 : 'alignment_point.y', 31 : 'alignment_point.z', 
    40 : 'height', 41 : 'x_scale', 
    50 : 'rotation_angle', 51 : 'oblique_angle', 
    70 : 'flags', 71 : 'text_generation_flags', 
    72 : 'horizontal_justification',  74 : 'vertical_justification',    
    },


'ATTRIB'    : {
    1 : 'text', 2 : 'tag', 3 : 'prompt', 7 : 'style',
    10 : 'insertion_point.x', 20 : 'insertion_point.y', 30 : 'insertion_point.z', 
    11 : 'alignment_point.x', 21 : 'alignment_point.y', 31 : 'alignment_point.z', 
    40 : 'height', 41 : 'x_scale', 
    50 : 'rotation_angle', 51 : 'oblique_angle', 
    70 : 'flags', 73 : 'length', 
    71 : 'text_generation_flags', 72 : 'horizontal_justification',  74 : 'vertical_justification',     
    },

'BLOCK'        : {
    1 : 'xref', 2 : 'name', 3 : 'also_name', 
    10 : 'base_point.x', 20 : 'base_point.y', 30 : 'base_point.z', 
    40 : 'size', 41 : 'x_scale', 
    50 : 'rotation_angle', 51 : 'oblique_angle',     
    70 : 'flags', 
    },

'CIRCLE'    : {
    10 : 'center.x', 20 : 'center.y', 30 : 'center.z', 
    40 : 'radius',
    39 : 'thickness',
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },

'DIMENSION'    : {
    1 : 'text', 2 : 'name', 3 : 'style',
    10 : 'def_point.x', 20 : 'def_point.y', 30 : 'def_point.z', 
    11 : 'mid_point.x', 21 : 'mid_point.y', 31 : 'mid_point.z', 
    12 : 'vector.x', 22 : 'vector.y', 32 : 'vector.z', 
    13 : 'def_point2.x', 23 : 'def_point2.y', 33 : 'def_point2.z', 
    14 : 'vector2.x', 24 : 'vector2.y', 34 : 'vector2.z', 
    15 : 'vector3.x', 25 : 'vector3.y', 35 : 'vector3.z', 
    16 : 'vector4.x', 26 : 'vector4.y', 36 : 'vector4.z', 
    70 : 'dimtype',
    },

'ELLIPSE'    : {
    10 : 'center.x', 20 : 'center.y', 30 : 'center.z', 
    11 : 'end_point.x', 21 : 'end_point.y', 31 : 'end_point.z', 
    40 : 'ratio', 41 : 'start', 42 : 'end',
    39 : 'thickness',
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },

'HATCH'        : {
    2 : 'pattern',
    10 : 'point.x', 20 : 'point.y', 30 : 'point.z', 
    41 : 'scale', 47 : 'pixelsize', 52 : 'angle',
    70 : 'fill', 71 : 'associativity', 75: 'style', 77 : 'double', 
    78 : 'numlines', 91 : 'numpaths', 98 : 'numseeds',
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },

'IMAGE'        : {
    10 : 'insertion_point.x', 20 : 'insertion_point.y', 30 : 'insertion_point.z', 
    11 : 'u_vector.x', 21 : 'u_vector.y', 31 : 'u_vector.z', 
    12 : 'v_vector.x', 22 : 'v_vector.y', 32 : 'v_vector.z', 
    13 : 'size.x', 23 : 'size.y', 33 : 'size.z', 
    14 : 'clip.x', 24 : 'clip.y', 34 : 'clip.z', 
    70 : 'display', 71 : 'cliptype', 
    90 : 'version',
    280 : 'clipstate', 281 : 'brightness', 282 : 'contrast', 283 : 'fade', 
    340 : 'image', 360 : 'reactor',
    },

'INSERT'    : {
    1 : 'attributes_follow', 2 : 'name',
    10 : 'insertion_point.x', 20 : 'insertion_point.y', 30 : 'insertion_point.z', 
    41 : 'x_scale', 42 : 'y_scale', 43 : 'z_scale', 
    44 : 'column_spacing', 45 : 'row_spacing', 
    50 : 'rotation_angle', 66 : 'attributes_follow',
    70 : 'column_count', 71 : 'row_count', 
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },

'LEADER'    : {
    3 : 'style',
    10 : ['new_vertex(data)'], 20 : 'vertex.y', 30 : 'vertex.z', 
    40 : 'height', 41 : 'width',
    71 : 'arrowhead', 72 : 'pathtype', 73 : 'creation', 
    74 : 'hookdir', 75 : 'hookline', 76 : 'numverts', 77 : 'color',
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    211 : 'horizon.x', 221 : 'horizon.y', 231 : 'horizon.z', 
    212 : 'offset_ins.x', 222 : 'offset_ins.y', 232 : 'offset_ins.z', 
    213 : 'offset_ann.x', 223 : 'offset_ann.y', 233 : 'offset_ann.z', 
    },

'LINE'        : {
    10 : 'start_point.x', 20 : 'start_point.y', 30 : 'start_point.z', 
    11 : 'end_point.x', 21 : 'end_point.y', 31 : 'end_point.z', 
    39 : 'thickness',
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },

'LWPOLYLINE'    : {
    10 : ['new_vertex(data)'], 20 : 'vertex.y', 30 : 'vertex.z', 
    38 : 'elevation', 39 : 'thickness',
    40 : 'start_width', 41 : 'end_width', 42 : 'bulge', 43 : 'constant_width',
    70 : 'flags', 90 : 'numverts',
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },
        
'MLINE'    : {
    10 : 'start_point.x', 20 : 'start_point.y', 30 : 'start_point.z', 
    11 : ['new_vertex(data)'], 21 : 'vertex.y', 31 : 'vertex.z', 
    12 : ['new_seg_dir(data)'], 22 : 'seg_dir.y', 32 : 'seg_dir.z', 
    13 : ['new_miter_dir(data)'], 23 : 'miter_dir.y', 33 : 'miter_dir.z', 
    39 : 'thickness',
    40 : 'scale', 41 : 'elem_param', 42 : 'fill_param',
    70 : 'justification', 71 : 'flags',
    72 : 'numverts', 73 : 'numelems', 74 : 'numparam', 75 : 'numfills',
    340 : 'id',
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },
        
'MTEXT'        : {
    1 : 'text', 3: 'more_text', 7 : 'style',
    10 : 'insertion_point.x', 20 : 'insertion_point.y', 30 : 'insertion_point.z', 
    11 : 'alignment_point.x', 21 : 'alignment_point.y', 31 : 'alignment_point.z', 
    40 : 'nominal_height', 41 : 'reference_width', 42: 'width', 43 : 'height', 44 : 'line_spacing',
    50 : 'rotation_angle', 
    71 : 'attachment_point', 72 : 'drawing_direction',  73 : 'spacing_style',    
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },

'POINT'        : {
    10 : 'point.x', 20 : 'point.y', 30 : 'point.z', 
    39 : 'thickness', 50 : 'orientation',
    },

'POLYLINE'    : {
    1 : 'verts_follow', 2 : 'name',
    10 : 'elevation.x', 20 : 'elevation.y', 30 : 'elevation.z', 
    39 : 'thickness',
    40 : 'start_width', 41 : 'end_width', 
    66 : 'verts_follow_flag',
    70 : 'flags', 71 : 'row_count', 72 : 'column_count', 
    73 : 'row_density', 74 : 'column_density', 75 : 'linetype',
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },

'RAY'        : {
    10 : 'point.x', 20 : 'point.y', 30 : 'point.z', 
    11 : 'direction.x', 21 : 'direction.y', 31 : 'direction.z', 
    },

'RTEXT'        : {
    1 : 'text', 7 : 'style',
    10 : 'insertion_point.x', 20 : 'insertion_point.y', 30 : 'insertion_point.z', 
    39 : 'thickness',
    40 : 'height', 
    50 : 'rotation_angle',
    70 : 'flags',
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },

'SHAPE'        : {
    2 : 'name', 
    10 : 'insertion_point.x', 20 : 'insertion_point.y', 30 : 'insertion_point.z', 
    39 : 'thickness',
    40 : 'size', 41 : 'x_scale', 
    50 : 'rotation_angle', 51 : 'oblique_angle',     
    39 : 'thickness',
    },

'SOLID'        : {
    10 : 'point0.x', 20 : 'point0.y', 30 : 'point0.z', 
    11 : 'point1.x', 21 : 'point1.y', 31 : 'point1.z', 
    12 : 'point2.x', 22 : 'point2.y', 32 : 'point2.z', 
    13 : 'point3.x', 23 : 'point3.y', 33 : 'point3.z', 
    39 : 'thickness',
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },

'SPLINE'    : {
    10 : ['new_control_point(data)'], 20 : 'control_point.y', 30 : 'control_point.z', 
    11 : ['new_fit_point(data)'], 21 : 'fit_point.y', 31 : 'fit_point.z', 
    40 : ['new_knot_value(data)'], 
    12 : 'start_tangent.x', 22 : 'start_tangent.y', 32 : 'start_tangent.z', 
    13 : 'end_tangent.x', 23 : 'end_tangent.y', 33 : 'end_tangent.z', 
    39 : 'thickness',
    41 : 'weight', 42 : 'knot_tol', 43 : 'control_point_tol', 44 : 'fit_tol',
    70 : 'flag', 71 : 'degree', 
    72 : 'num_knots', 73 : 'num_control_points', 74 : 'num_fit_points',
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },

'TEXT'        : {
    1 : 'text', 7 : 'style',
    10 : 'insertion_point.x', 20 : 'insertion_point.y', 30 : 'insertion_point.z', 
    11 : 'alignment_point.x', 21 : 'alignment_point.y', 31 : 'alignment_point.z', 
    40 : 'height', 41 : 'x_scale', 
    50 : 'rotation_angle', 51 : 'oblique_angle', 
    71 : 'flags', 72 : 'horizontal_justification',  73 : 'vertical_justification',    
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },

'TOLERANCE'    : {
    3 : 'style',
    10 : 'insertion_point.x', 20 : 'insertion_point.y', 30 : 'insertion_point.z', 
    11 : 'direction.x', 21 : 'direction.y', 31 : 'direction.z', 
    },

'TRACE'        : {
    10 : 'point0.x', 20 : 'point0.y', 30 : 'point0.z', 
    11 : 'point1.x', 21 : 'point1.y', 31 : 'point1.z', 
    12 : 'point2.x', 22 : 'point2.y', 32 : 'point2.z', 
    13 : 'point3.x', 23 : 'point3.y', 33 : 'point3.z', 
    39 : 'thickness',
    210 : 'normal.x', 220 : 'normal.y', 230 : 'normal.z', 
    },

'VERTEX'    : {
    10 : 'location.x', 20 : 'location.y', 30 : 'location.z', 
    40 : 'start_width', 41 : 'end_width', 42 : 'bulge', 
    50 : 'tangent',
    70 : 'flags',
    71 : 'index1', 72 : 'index2', 73 : 'index3', 74 : 'index4', 
    },

'VIEWPORT'    : {
    10 : 'center.x', 20 : 'center.y', 30 : 'center.z', 
    12 : 'view_center.x', 22 : 'view_center.y', 32 : 'view_center.z', 
    13 : 'snap_base.x', 23 : 'snap_base.y', 33 : 'snap_base.z', 
    14 : 'snap_spacing.x', 24 : 'snap_spacing.y', 34 : 'snap_spacing.z', 
    15 : 'grid_spacing.x', 25 : 'grid_spacing.y', 35 : 'grid_spacing.z', 
    16 : 'view_direction.x', 26 : 'view_direction.y', 36 : 'view_direction.z', 
    40 : 'width', 41 : 'height',
    68 : 'status', 69 : 'id',
    },

'WIPEOUT'    : {
    10 : 'point.x', 20 : 'point.y', 30 : 'point.z', 
    11 : 'direction.x', 21 : 'direction.y', 31 : 'direction.z', 
    },

}


#
#    Flags
#

# Polyline flags
PL_CLOSED         = 0x01
PL_CURVE_FIT_VERTS    = 0x02
PL_SPLINE_FIT_VERTS    = 0x04
PL_3D_POLYLINE        = 0x08
PL_3D_POLYGON_MESH    = 0x10
PL_CLOSED_IN_N_DIR    = 0x20
PL_POLYFACE_MESH    = 0x40
PL_CONTINUOUS        = 0x80


# Vertex flags
VX_EXTRA_FLAG_CREATED        = 0x01
VX_CURVE_FIT_TANGENT_DEFINED    = 0x02
VX_SPLINE_VERTEX_CREATED    = 0x08
VX_SPLINE_FRAME_CONTROL_POINT    = 0x10
VX_3D_POLYLINE_VERTEX        = 0x20
VX_3D_POLYGON_MESH_VERTEX    = 0x40
VX_POLYFACE_MESH_VERTEX        = 0x80

# 3DFACE flags

F3D_EDGE0_INVISIBLE = 0x01
F3D_EDGE1_INVISIBLE = 0x02
F3D_EDGE2_INVISIBLE = 0x04
F3D_EDGE3_INVISIBLE = 0x08

#
#    readDxfFile(filePath):
#

def readDxfFile(fileName):    
    global toggle, theCodec

    print( "Opening DXF file "+ fileName )

    # fp= open(fileName, "rU")
    fp = codecs.open(fileName, "r", encoding=theCodec)
    first = True
    statements = []
    no = 0
    for line in fp: 
        word = line.strip()
        no += 1
        if first:
            if word:
                code = int(word)
                first = False
        else:
            if toggle & T_Verbose:
                print("%4d: %4d %s" % (no, code, word))
            if code < 10:
                data = word
            elif code < 60:
                data = float(word)
            elif code < 100:
                data = int(word)
            elif code < 140:
                data = word
            elif code < 150:
                data = float(word)
            elif code < 200:
                data = int(word)
            elif code < 300:
                data = float(word)
            elif code < 370:
                data = word
            elif code < 390:
                data = int(word)
            elif code < 400:
                data = word
            elif code < 410:
                data = int(word)
            elif code < 1010:
                data = word
            elif code < 1060:
                data = float(word)
            elif code < 1080:
                data = int(word)

            statements.append((code,data))
            first = True
    fp.close()

    statements.reverse()
    sections = {}
    handles = {}
    while statements:
        (code,data) = statements.pop()
        if code == 0:
            if data == 'SECTION':
                section = CSection()
        elif code == 2:
            section.type = data
            if data == 'HEADER':
                parseHeader(section, statements, handles)
                known = False
            elif data == 'CLASSES':
                parseClasses(section, statements, handles)
                known = False
            elif data == 'TABLES':
                parseTables(section, statements, handles)
                known = False
            elif data == 'BLOCKS':
                parseBlocks(section, statements, handles)
                known = False
            elif data == 'ENTITIES':
                parseEntities(section, statements, handles)
                known = False
            elif data == 'OBJECTS':
                parseObjects(section, statements, handles)
            elif data == 'THUMBNAILIMAGE':
                parseThumbnail(section, statements, handles)
            sections[data] = section
        elif code == 999:
            pass
        else:
            raise NameError("Unexpected code in SECTION context: %d %s" % (code,data))

    if toggle & T_Verbose:
        for (typ,section) in sections.items():
            section.display()
    return sections
    

#
#     0
#    SECTION
#      2
#    HEADER
#    
#      9
#    $<variable>
#    <group code>
#    <value>
#    
#      0
#    ENDSEC

    
def parseHeader(section, statements, handles):
    while statements:
        (code,data) = statements.pop()
        if code == 0:
            if data == 'ENDSEC':
                return

    return


#      0
#    SECTION
#      2
#    CLASSES
#    
#      0
#    CLASS
#      1
#    <class dxf record>
#      2
#    <class name>
#      3
#    <app name>
#    90
#    <flag>
#    280
#    <flag>
#    281
#    <flag>
#    
#      0
#    ENDSEC         

def parseClasses(section, statements, handles):
    while statements:
        (code,data) = statements.pop()
        if code == 0:
            if data == 'ENDSEC':
                return

    return
    

#      0
#    SECTION
#      2
#    TABLES
#    
#      0
#    TABLE
#      2
#    <table type>
#      5
#    <handle>
#    100
#    AcDbSymbolTable
#    70
#    <max. entries>
#    
#      0
#    <table type>
#      5
#    <handle>
#    100
#    AcDbSymbolTableRecord
#    .
#    . <data>
#    .
#    
#      0
#    ENDTAB
#    
#      0
#    ENDSEC 

#
#      APPID (application identification table)
#
#      BLOCK_RECORD (block reference table)
#
#      DIMSTYLE (dimension style table)
#
#      LAYER (layer table)
#
#      LTYPE (linetype table)
#
#      STYLE (text style table)
#
#      UCS (User Coordinate System table)
#
#      VIEW (view table)
#
#      VPORT (viewport configuration table)


def parseTables(section, statements, handles):
    tables = []
    section.data = tables
    while statements:
        (code,data) = statements.pop()
        if code == 0:
            if data == 'ENDSEC':
                return
    '''
                known = False
            elif data == 'TABLE':
                table = CTable()
                tables.append(table)
                known = False
            elif data == 'ENDTAB':
                pass
                known = False
            elif data == table.type:
                parseTableType
                table = CTable()
                tables.append(table)
                table.type = word
        elif code == 2:
            table.type = word
        elif code == 5:
            table.handle = word
            handles[word] = table
        elif code == 330:
            table.owner = word
        elif code == 100:
            table.subclass = word
        elif code == 70: