def polygon_name_face(node, *args, **kwargs):
"""create a wedge shaped face in the style of ARB
Args:
width (int): size in pixels for the width of the wedge
height (int): size in pixels for the height of the wedge
width_percent (float): change the angle of the point of the wedge.
This must be a number between 0 and 1
Returns:
QGraphicsRectItem: The Qt graphics item of the polygon
"""
n_leaves = len(node.get_leaves())
closest_leaf_dist = node.get_closest_leaf()[1]
farthest_leaf_dist = node.get_farthest_leaf()[1]
base_height = 30
width = 60
height = math.log(n_leaves, 2) + base_height
width_percent = closest_leaf_dist / farthest_leaf_dist
#print(width, height, width_percent)
points = [
(0.0, 0.0), # top left point
(width, 0.0), # top right point
(width * width_percent, height), # bottom right point
(0.0, height), # bottom left point
(0.0, 0.0) # back to the beginning
]
shape = QPolygonF()
for i in points:
shape << QtCore.QPointF(*i)
## Creates a main master Item that will contain all other elements
## Items can be standard QGraphicsItem
masterItem = QGraphicsRectItem(0, 0, width, height)
# Keep a link within the item to access node info
masterItem.node = node
# I dont want a border around the masterItem
masterItem.setPen(QPen(QtCore.Qt.NoPen))
polygon = QGraphicsPolygonItem(shape, masterItem)
# Make the wedge grey in color
polygon.setBrush(QBrush(QColor( '#D3D3D3')))
# Print the name of the node
# Center text according to masterItem size
center = masterItem.boundingRect().center()
text = QGraphicsSimpleTextItem(node.name)
text.setParentItem(polygon)
tw = text.boundingRect().width()
th = text.boundingRect().height()
text.setPos(center.x() + tw/2, center.y() - th/2)
# this is a hack to prevent the name being printed twice
# we set the node name to blank after we write it with the QGraphicsSimpleTextItem
# it must be set to a blank string for it not to be printed later
node.name = ''
# print the number of collapsed leaves in the polygon
leaves_count_text = QGraphicsSimpleTextItem('('+str(n_leaves)+')')
leaves_count_text.setParentItem(polygon)
leaves_count_text.setFont(QFont('Veranda', 6))
leaves_count_text.setPos(masterItem.boundingRect().x() + 5, center.y() - leaves_count_text.boundingRect().height()/2)
polygon.setPos(0, masterItem.boundingRect().y()/1.5)
return masterItem
