class FillParameters:
'''
Stores parameters for filling a shape, and can apply them to a context
'''
def __init__(self, pattern=Color(0), fill_rule=WINDING):
'''
Initialise the fill parameters
:param pattern: the fill pattern or color to use, None for default
:param fill_rule: the fill rule to use, None for default
'''
self.pattern = Color(0) if pattern is None else pattern
self.fill_rule = WINDING if fill_rule is None else fill_rule
def apply(self, ctx):
'''
Apply the settings to a context. After this, any fill operation using the context will use the
settings.
:param ctx: The context to apply the settinsg to.
'''
if isinstance(self.pattern, Color):
ctx.set_source_rgba(*self.pattern)
else:
ctx.set_source(self.pattern.get_pattern())
if self.fill_rule == WINDING:
ctx.set_fill_rule(cairo.FillRule.WINDING)
else:
ctx.set_fill_rule(cairo.FillRule.EVEN_ODD)
class StrokeParameters:
'''
Stores parameters for stroking a shape, and can apply them to a context
'''
def __init__(self,
pattern=Color(0),
line_width=None,
dash=None,
cap=None,
join=None,
miter_limit=None):
'''
Initialise the stroke parameters
:param pattern: the fill pattern or color to use for the outline, None for default
:param line_width: width of stroke line, None for default
:param dash: dash patter of line, as for Pycairo, None for default
:param cap: line end style, None for default
:param join: line join style, None for default
:param miter_limit: mitre limit, None for default
'''
self.pattern = Color(0) if pattern is None else pattern
self.line_width = 1 if line_width is None else line_width
self.dash = [] if dash is None else dash
self.cap = SQUARE if cap is None else cap
self.join = MITER if join is None else join
self.miter_limit = 10 if miter_limit is None else miter_limit
def apply(self, ctx):
'''
Apply the settings to a context. After this, any stroke operation using the context will use the
settings.
:param ctx: The context to apply the settinsg to.
'''
if isinstance(self.pattern, Color):
ctx.set_source_rgba(*self.pattern)
else:
ctx.set_source(self.pattern.get_pattern())
ctx.set_line_width(self.line_width)
ctx.set_dash(self.dash)
if self.cap == ROUND:
ctx.set_line_cap(cairo.LineCap.ROUND)
elif self.cap == BUTT:
ctx.set_line_cap(cairo.LineCap.BUTT)
else:
ctx.set_line_cap(cairo.LineCap.SQUARE)
if self.join == ROUND:
ctx.set_line_join(cairo.LineJoin.ROUND)
elif self.join == BEVEL:
ctx.set_line_join(cairo.LineJoin.BEVEL)
else:
ctx.set_line_join(cairo.LineJoin.MITER)
ctx.set_miter_limit(self.miter_limit)
