def paintEvent(self, event):
painter = QPainter(self)
painter.save()
path = QPainterPath()
painter.setFont(self.font)
painter.setRenderHint(QPainter.Antialiasing)
pen = QPen(QColor(0, 0, 0, 230))
pen_width = 3
pen.setWidth(pen_width)
len = self.metrics.width(self.txt)
w = self.width()
px = (len - w) / 2
if px < 0:
px = -px
py = (self.height() - self.metrics.height()) / 2 + self.metrics.ascent()
if py < 0:
py = -py
path.addText(px + 2, py + 2, self.font, self.txt)
painter.strokePath(path, pen)
painter.drawPath(path)
painter.fillPath(path, QBrush(self.color))
painter.restore()
def paintEvent(self, event: QPaintEvent):
super().paintEvent(event)
if self._viewport_anchoring_scheduled:
self._anchor_viewport()
self._viewport_anchoring_scheduled = False
painter = QPainter(self.viewport())
painter.setRenderHint(QPainter.Antialiasing)
painter.setBrush(QColor(123, 184, 234))
painter.setPen(QPen(Qt.white, 0.5))
scale_text = f'{self._cur_scale * 100:.0f}%'
scale_text_bounding_rect = self._scale_font_metrics.boundingRect(
scale_text)
viewport_rect = self.viewport().rect()
# Align the scale text to (Qt.AlignHCenter | Qt.AlignBottom)
pad = 2
self._scale_text_rect = QRect(viewport_rect.width() / 2 - scale_text_bounding_rect.width() / 2,
viewport_rect.height() - scale_text_bounding_rect.height() - 6,
scale_text_bounding_rect.width(), scale_text_bounding_rect.height())\
.adjusted(-pad, -pad, pad, pad) # add pads to update when scrolling without artifacts
# Use QPainterPath to draw text with outline
path = QPainterPath()
path.addText(self._scale_text_rect.bottomLeft(), self._scale_font,
scale_text)
painter.drawPath(path)
def test_text(self, p, opd):
font = QFont()
path = QPainterPath()
path.addText(0, 0, font, "T")
p.drawPath(path)
lines = opd.getOutlines()
assert len(lines) == 1
def paint(self, painter: QPainter, option: QStyleOptionGraphicsItem,
widget: Optional[QWidget]) -> None:
# Draw a circle for the node
pen = QPen(Qt.gray)
pen.setWidth(2)
pen.setCosmetic(True)
# Combine ideas from these code samples to draw items at a fixed size:
# https://stackoverflow.com/questions/1222914/qgraphicsview-and-qgraphicsitem-don%C2%B4t-scale-item-when-scaling-the-view-rect
# https://www.qtcentre.org/threads/28691-Scale-independent-QGraphicsItem
object_rect = self.boundingRect()
mapped_rect = painter.transform().mapRect(object_rect)
width_ratio = object_rect.width() / mapped_rect.width()
scale_factor = max(1, width_ratio)
painter.setPen(pen)
painter.setBrush(Qt.gray)
scaled_diameter = self.diameter * scale_factor
painter.drawEllipse((self.x - scaled_diameter / 2),
(self.y - scaled_diameter / 2), scaled_diameter,
scaled_diameter)
# Draw text for the node name
label_path = QPainterPath()
label_font = QFont("Calibri", 10 * scale_factor)
label_path.addText(self.x, -self.y - self.diameter / 2, label_font,
self.name)
painter.scale(1.0, -1.0)
painter.setBrush(Qt.blue)
painter.setPen(Qt.NoPen)
painter.drawPath(label_path)
