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 __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}