def _get_brush(self, properties: Properties) -> qg.QBrush:
filling = properties.filling
if filling:
if filling.type == filling.PATTERN:
if (
self.config.hatch_policy
== HatchPolicy.SHOW_APPROXIMATE_PATTERN
):
# Default pattern scaling is not supported by PyQt:
key: PatternKey = (filling.name, filling.angle)
qt_pattern = self._pattern_cache.get(key) # type: ignore
if qt_pattern is None:
qt_pattern = self._get_qt_pattern(filling.pattern)
self._pattern_cache[key] = qt_pattern
elif self.config.hatch_policy == HatchPolicy.SHOW_SOLID:
qt_pattern = qc.Qt.SolidPattern # type: ignore
elif self.config.hatch_policy == HatchPolicy.SHOW_OUTLINE:
return self._no_fill
else:
raise ValueError(self.config.hatch_policy)
else:
qt_pattern = qc.Qt.SolidPattern # type: ignore
return qg.QBrush(self._get_color(properties.color), qt_pattern) # type: ignore
else:
return self._no_fill
def __init__(
self,
scene: Optional[qw.QGraphicsScene] = None,
*,
use_text_cache: bool = True,
debug_draw_rect: bool = False,
extra_lineweight_scaling: float = 2.0,
):
"""
Args:
extra_lineweight_scaling: compared to other backends,
PyQt draws lines which appear thinner
"""
super().__init__()
self._scene = scene or qw.QGraphicsScene() # avoids many type errors
self._color_cache: Dict[Color, qg.QColor] = {}
self._pattern_cache: Dict[PatternKey, int] = {}
self._no_line = qg.QPen(qc.Qt.NoPen)
self._no_fill = qg.QBrush(qc.Qt.NoBrush)
self._text_renderer = TextRenderer(qg.QFont(), use_text_cache)
self._line_renderer: PyQtLineRenderer
self._extra_lineweight_scaling = extra_lineweight_scaling
self._debug_draw_rect = debug_draw_rect
def draw_point(self, pos: Vec3, properties: Properties) -> None:
"""Draw a real dimensionless point."""
brush = qg.QBrush(self._get_color(properties.color), qc.Qt.SolidPattern)
item = _Point(pos.x, pos.y, brush)
self._set_item_data(item)
self._scene.addItem(item)
def set_background(self, color: Color):
self._scene.setBackgroundBrush(qg.QBrush(self._get_color(color)))