class TaskGraphicsItem (QGraphicsEllipseItem):
def __init__(self, rect=None):
super(TaskGraphicsItem, self).__init__()
if rect is not None:
self.setRect(rect)
self.setPen(QPen(Qt.NoPen))
# Setup the text item
self.textItem = QGraphicsTextItem()
self.textItem.setParentItem(self)
self.textItem.rotate(-90)
self.textItem.setDefaultTextColor(QColor(255, 255, 255))
# The dimensions to reach via a LERP.
self.startPos = QPointF(0, 0)
self.endPos = QPointF(0, 0)
self.startDiameter = 1
self.endDiameter = 1
self.centerMark = QGraphicsEllipseItem()
self.centerMark.setBrush(QBrush(Qt.white))
self.centerMark.setPen(QPen(Qt.NoPen))
self.centerMark.setParentItem(self)
self.pid = -1
# To determine if it is associated with an active process.
self.used = False
def mousePressEvent(self, event):
print "Clicked On Ellipse at: ", self.rect().topLeft()
def set_pid(self, pid):
self.pid = pid
def set_name(self, str_name):
self.textItem.setPlainText(str_name)
def update_name_pos(self):
rect = self.boundingRect()
text_rect = self.textItem.boundingRect()
# Center text (on the x-axis) and offset (on the y-axis) so it doesn't overlap the ellipse item.
x_text = rect.x() + rect.width()/2 - text_rect.height()/2
y_text = rect.y() + 100 + text_rect.width() + rect.height()
self.textItem.setPos(x_text, y_text)
# Time step is in seconds.
def update(self, time_step):
diameter = self.rect().width() + self.lerp_rate(self.startDiameter, self.endDiameter, time_step)
if diameter <= 1:
diameter = 1
pos = self.rect().topLeft()
x = pos.x() + self.lerp_rate(self.startPos.x(), self.endPos.x(), time_step)
y = pos.y() + self.lerp_rate(self.startPos.y(), self.endPos.y(), time_step)
self.setRect(QRectF(x, y, diameter, diameter))
self.update_name_pos()
self.update_center_mark()
def update_center_mark(self):
scale = self.scene().views()[0].currentScale
hwidth = self.rect().width() / 2.0
diam = 2.0 / scale
# Only mark center for large enough items.
if hwidth * 0.2 > diam:
self.centerMark.setVisible(True)
hdiam = diam / 2.0
pos = self.rect().topLeft()
x = pos.x() - hdiam + hwidth
y = pos.y() - hdiam + hwidth
self.centerMark.setRect(QRectF(x, y, diam, diam))
else:
self.centerMark.setVisible(False)
# Return the linear interpolation rate. Reach start to end at a rate of 'growth rate'
@staticmethod
def lerp_rate(start, end, time_step):
return (end - start) * time_step
