def colorIcons(name: str, size: int = 20) -> QIcon:
"""Get color block as QIcon by name."""
colorBlock = QPixmap(QSize(size, size))
colorBlock.fill(colorQt(name))
return QIcon(colorBlock)
def to_graph(
g: Graph,
width: int,
engine: Union[str, Pos],
node_mode: bool,
show_label: bool,
monochrome: bool,
*,
except_node: Optional[int] = None
) -> QIcon:
"""Draw a generalized chain graph."""
pos: Pos = engine_picker(g, engine, node_mode)
if not pos:
pixmap = QPixmap(width, width)
pixmap.fill(Qt.transparent)
return QIcon(pixmap)
width_bound = -float('inf')
for x, y in pos.values():
if abs(x) > width_bound:
width_bound = x
if abs(y) > width_bound:
width_bound = y
width_bound *= 2.5
image = QImage(
QSize(int(width_bound), int(width_bound)),
QImage.Format_ARGB32_Premultiplied
)
image.fill(Qt.transparent)
painter = QPainter(image)
painter.translate(image.width() / 2, image.height() / 2)
pen = QPen()
r = int(width_bound / 50)
pen.setWidth(r)
painter.setPen(pen)
_font.setPixelSize(r * 6)
painter.setFont(_font)
# Draw edges.
if node_mode:
for l1, l2 in g.edges:
if except_node in {l1, l2}:
pen.setColor(Qt.gray)
else:
pen.setColor(Qt.black)
painter.setPen(pen)
painter.drawLine(
QPointF(pos[l1][0], -pos[l1][1]),
QPointF(pos[l2][0], -pos[l2][1])
)
else:
if monochrome:
color = QColor(Qt.darkGray)
else:
color = QColor(226, 219, 190)
color.setAlpha(150)
painter.setBrush(QBrush(color))
for link in g.nodes:
if link == except_node:
pen.setColor(Qt.gray)
else:
pen.setColor(Qt.black)
painter.setPen(pen)
painter.drawPolygon(*convex_hull([
(pos[n][0], -pos[n][1])
for n, edge in edges_view(g) if link in edge
], as_qpoint=True))
# Draw nodes.
for k, (x, y) in pos.items():
if node_mode:
color = color_num(len(list(g.neighbors(k))) - 1)
if k == except_node:
color.setAlpha(150)
else:
if monochrome:
color = Qt.black
elif except_node in dict(edges_view(g))[k]:
color = color_qt('Green')
else:
color = color_qt('Blue')
pen.setColor(color)
painter.setPen(pen)
painter.setBrush(QBrush(color))
point = QPointF(x, -y)
painter.drawEllipse(point, r, r)
if show_label:
pen.setColor(Qt.darkMagenta)
painter.setPen(pen)
painter.drawText(point, str(k))
painter.end()
return QIcon(QPixmap.fromImage(image).scaledToWidth(width))
