def __init__(self, casingod, casingid, liningod, liningid, flange):
"""
Initializes a Pipe instance.
Subclasses should call this at the beginning of their own
constructor function.
Arguments:
casingod -- outside diameter of casing, in mm
casingid -- inside diameter of casing, in mm
liningod -- outside diameter of lining, in mm
liningid -- inside diameter of lining, in mm
flange -- name of flange
"""
# Call superclass constructor
DrawnComponent.__init__(self)
# Properties common to all pipe components
self.flange = Flange(flange)
# Bend diameters and radii common to all pipe components
self.diameters = {"co": casingod,
"ci": casingid,
"lo": liningod,
"li": liningid,
"fi": self.flange.hole_diameter,
"fo": self.flange.flange_diameter}
self.p_rad = {"co": casingod / 2.0,
"ci": casingid / 2.0,
"lo": liningod / 2.0,
"li": liningid / 2.0,
"fi": self.flange.hole_diameter / 2.0,
"fo": self.flange.flange_diameter / 2.0}
# Colors common to all pipe components
comp_col = {"co": (0.8, 0.8, 0.8), "ci": (0.9, 0.9, 0.9),
"lo": (0.6, 0.6, 0.6), "li": (1.0, 1.0, 1.0)}
self.colors = {"comp": comp_col}
class Pipe(DrawnComponent):
"""
Pipe class to be used to automatically create a drawing.
Public methods:
__init__()
"""
def __init__(self, casingod, casingid, liningod, liningid, flange):
"""
Initializes a Pipe instance.
Subclasses should call this at the beginning of their own
constructor function.
Arguments:
casingod -- outside diameter of casing, in mm
casingid -- inside diameter of casing, in mm
liningod -- outside diameter of lining, in mm
liningid -- inside diameter of lining, in mm
flange -- name of flange
"""
# Call superclass constructor
DrawnComponent.__init__(self)
# Properties common to all pipe components
self.flange = Flange(flange)
# Bend diameters and radii common to all pipe components
self.diameters = {"co": casingod,
"ci": casingid,
"lo": liningod,
"li": liningid,
"fi": self.flange.hole_diameter,
"fo": self.flange.flange_diameter}
self.p_rad = {"co": casingod / 2.0,
"ci": casingid / 2.0,
"lo": liningod / 2.0,
"li": liningid / 2.0,
"fi": self.flange.hole_diameter / 2.0,
"fo": self.flange.flange_diameter / 2.0}
# Colors common to all pipe components
comp_col = {"co": (0.8, 0.8, 0.8), "ci": (0.9, 0.9, 0.9),
"lo": (0.6, 0.6, 0.6), "li": (1.0, 1.0, 1.0)}
self.colors = {"comp": comp_col}
def set_scale(self, ctx, page_w, page_h):
"""
Automatically sets a scale factor for the drawing.
This will normally be called after the set_scale()
function of a subclass has set the scale factor.
'page_h' and 'page_w' should already have been up-scaled
by the time this happens.
Arguments:
ctx -- a Pycairo context
page_w, page_h -- height and width of the drawing area
"""
# Upscale lines
# Note that self.dim_line_length is used to calculate
# the lengths of radius dimension lines. These lengths
# can differ for individual subclasses, and so
# self.dim_line_length should be set in the subclass's
# own set_scale() function, but the dimension is common
# to all Pipe subclasses, and so we upscale it here.
self.dim_line_length /= self.scale # pylint: disable=E1101
# Call parent function
DrawnComponent.set_scale(self, ctx, page_w, page_h)
def draw_component(self, ctx, page_w, page_h):
"""
Draws a core pipe component. Mainly calls supporting functions.
This function is called by the 'component' base class. Subclasses
should override this and call it at the beginning of their own
draw_component() function, before providing further specific
drawing functionality.
Arguments:
ctx -- a Pycairo context
page_w, page_h -- width and height of drawing area
"""
# Draw the filled outer casing without an outline. Leaving
# the overall outline until last, and drawing the other
# segments with just side outlines, avoids drawing overlapping
# lines across the bend face.
self.draw_pipe_comp(ctx, "co", fill=True)
self.draw_pipe_comp(ctx, "ci", fill=True, edges=True)
self.draw_pipe_comp(ctx, "lo", fill=True, edges=True)
self.draw_pipe_comp(ctx, "li", fill=True, edges=True)
self.draw_pipe_comp(ctx, "co", outline=True)
# Draw the other components
self.draw_bend_profile(ctx)
self.draw_rad_dims(ctx)
self.draw_flanges(ctx)
def draw_pipe_comp(self, ctx, comp, fill=False,
outline=False, edges=False):
"""
Draws a segmented component of a bend.
Arguments:
ctx -- a Pycairo context
comp -- type of component, "co", "ci", "lo" or "li"
fill -- fills the component with color if True
outline -- draws an outline around the entire component if True
edges -- draws lines only along the segment edges if True
"""
ctx.save()
pts_out = self.pc_pts["out"][comp] # pylint: disable=E1101
pts_in = self.pc_pts["in"][comp] # pylint: disable=E1101
if fill or outline:
pts = pts_out + pts_in
for point in pts:
if point is pts[0]:
ctx.move_to(*point.t())
else:
ctx.line_to(*point.t())
ctx.close_path()
if fill:
if comp == "co" and self.hatching:
ctx.set_source(self.chatch)
elif comp == "lo" and self.hatching:
ctx.set_source(self.lhatch)
else:
ctx.set_source_rgb(*self.colors["comp"][comp])
if outline:
ctx.fill_preserve()
else:
ctx.fill()
if outline:
ctx.set_source_rgb(*self.drawing_line_color)
ctx.stroke()
if edges:
ctx.set_source_rgb(*self.drawing_line_color)
for point in pts_out:
if point is pts_out[0]:
ctx.move_to(*point.t())
else:
ctx.line_to(*point.t())
ctx.stroke()
for point in pts_in:
if point is pts_in[0]:
ctx.move_to(*point.t())
else:
ctx.line_to(*point.t())
ctx.stroke()
ctx.restore()
def draw_center_line(self, ctx):
"""
Draws a dashed line along the center of the pipe.
Note that this line will be segmented, not curved, for pipe bends.
Arguments:
ctx -- a Pycairo context
"""
ctx.save()
ctx.set_dash(self.dash_style)
for point in self.pc_pts["ctr"]: # pylint: disable=E1101
if point == self.pc_pts["ctr"][0]: # pylint: disable=E1101
ctx.move_to(*point.t())
else:
ctx.line_to(*point.t())
ctx.stroke()
ctx.restore()
def draw_rad_dims(self, ctx):
"""
Draw the radius dimensions of the bend.
Arguments:
ctx -- a Pycairo context
"""
# The angle at which the radius dimension lines are drawn
# depends on the bend angle for pipe bends, but is always
# vertical for pipe straights. Since this will be called
# from a subclass, check whether we have a pipe bend by
# verifying whether the "bend_arc" instance attribute is set.
if hasattr(self, "bend_arc"):
b_arc = self.bend_arc # pylint: disable=E1101
else:
b_arc = 0
pts = {}
ctx.save()
for scale, comp in zip(range(4, 0, -1), ["co", "ci", "lo", "li"]):
# pylint: disable=E1101
dll = self.dim_line_length * scale
for i in ["out", "in"]:
point = self.pc_pts[i][comp][-1 if i == "out" else 0]
pts[i] = ptoc(b_arc + pi / 2, dll, point)
ctx.move_to(*point.t())
ctx.line_to(*pts[i].t())
# pylint: enable=E1101
ctx.stroke()
draw_dim_line(ctx, pts["out"], pts["in"],
self.diameters[comp], self.scale, 0)
ctx.restore()
def draw_bend_profile(self, ctx):
"""
Draws a half profile view of the pipe at the bottom.
Arguments:
ctx -- a Pycairo context
"""
ctx.save()
ctx.translate(self.pc_pts["ctr"][0].x, # pylint: disable=E1101
self.pc_pts["ctr"][0].y) # pylint: disable=E1101
for rad in [self.p_rad[k] for k in ["li", "lo", "ci", "co"]]:
ctx.arc(0, 0, rad, 0, pi)
ctx.stroke()
ctx.restore()
def draw_flanges(self, ctx):
"""
Draws the flanges.
Arguments:
ctx -- a Pycairo context
"""
# The angle at which the upper flange is drawn
# depends on the bend angle for pipe bends, but is always
# horizontal for pipe straights. Since this will be called
# from a subclass, check whether we have a pipe bend by
# verifying whether the "bend_arc" instance attribute is set.
# pylint: disable=E1101
if hasattr(self, "bend_arc"):
b_arc = self.bend_arc
else:
b_arc = 0
self.flange.draw(ctx, cfp=self.pc_pts["ctr"][0], angle=0,
profile=True, dash_style=self.dash_style)
self.flange.draw(ctx, cfp=self.pc_pts["ctr"][-1], angle=b_arc + pi,
profile=False)