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# To play with random colors
import colorsys
import random
from ... import Tree, faces, TreeStyle, NodeStyle, Face
# We will need to create Qt4 items
from ...treeview.qt import QtCore, Qt
from ...treeview.qt import QGraphicsRectItem, QGraphicsSimpleTextItem, \
QGraphicsEllipseItem, QColor, QPen, QBrush
class InteractiveItem(QGraphicsRectItem):
def __init__(self, *arg, **karg):
QGraphicsRectItem.__init__(self, *arg, **karg)
self.node = None
self.label = None
self.setCursor(QtCore.Qt.PointingHandCursor)
def hoverEnterEvent (self, e):
# There are many ways of adding interactive elements. With the
# following code, I show/hide a text item over my custom
# DynamicItemFace
if not self.label:
self.label = QGraphicsRectItem()
self.label.setParentItem(self)
# This is to ensure that the label is rendered over the
# rest of item children (default ZValue for items is 0)
self.label.setZValue(1)
self.label.setBrush(QBrush(QColor("white")))
self.label.text = QGraphicsSimpleTextItem()
self.label.text.setParentItem(self.label)
self.label.text.setText(self.node.name)
self.label.setRect(self.label.text.boundingRect())
self.label.setVisible(True)
def hoverLeaveEvent(self, e):
if self.label:
self.label.setVisible(False)
def random_color(h=None):
"""Generates a random color in RGB format."""
if not h:
h = random.random()
s = 0.5
l = 0.5
return _hls2hex(h, l, s)
def _hls2hex(h, l, s):
return '#%02x%02x%02x' %tuple(map(lambda x: int(x*255),
colorsys.hls_to_rgb(h, l, s)))
def ugly_name_face(node, *args, **kargs):
""" This is my item generator. It must receive a node object, and
returns a Qt4 graphics item that can be used as a node face.
"""
# receive an arbitrary number of arguments, in this case width and
# height of the faces
width = args[0]
height = args[1]
## Creates a main master Item that will contain all other elements
## Items can be standard QGraphicsItem
# masterItem = QGraphicsRectItem(0, 0, width, height)
# Or your custom Items, in which you can re-implement interactive
# functions, etc. Check QGraphicsItem doc for details.
masterItem = InteractiveItem(0, 0, width, height)
masterItem.setAcceptHoverEvents(True)
# 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))
# Add ellipse around text
ellipse = QGraphicsEllipseItem(masterItem.rect())
ellipse.setParentItem(masterItem)
# Change ellipse color
ellipse.setBrush(QBrush(QColor( random_color())))
# Add node name within the ellipse
text = QGraphicsSimpleTextItem(node.name)
text.setParentItem(ellipse)
text.setPen(QPen(QPen(QColor("white"))))
# Center text according to masterItem size
tw = text.boundingRect().width()
th = text.boundingRect().height()
center = masterItem.boundingRect().center()
text.setPos(center.x()-tw/2, center.y()-th/2)
return masterItem
def master_ly(node):
if node.is_leaf():
# Create an ItemFAce. First argument must be the pointer to
# the constructor function that returns a QGraphicsItem. It
# will be used to draw the Face. Next arguments are arbitrary,
# and they will be forwarded to the constructor Face function.
F = faces.DynamicItemFace(ugly_name_face, 100, 50)
faces.add_face_to_node(F, node, 0, position="aligned")
def get_example_tree():
t = Tree()
t.populate(8, reuse_names=False)
ts = TreeStyle()
ts.layout_fn = master_ly
ts.title.add_face(faces.TextFace("Drawing your own Qt Faces", fsize=15), 0)
return t, ts
if __name__ == "__main__":
t, ts = get_example_tree()
#t.render("item_faces.png", h=400, tree_style=ts)
# The interactive features are only available using the GUI
t.show(tree_style=ts)
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