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"""Common gui.OWComponent components."""
from AnyQt.QtCore import Qt, QRectF
from AnyQt.QtGui import QFont, QPalette
from AnyQt.QtWidgets import QGraphicsEllipseItem
import pyqtgraph as pg
from Orange.widgets.visualize.owscatterplotgraph import (
OWScatterPlotBase, ScatterBaseParameterSetter
)
from Orange.widgets.visualize.utils.customizableplot import Updater
from Orange.widgets.visualize.utils.plotutils import (
MouseEventDelegate, DraggableItemsViewBox
)
class AnchorParameterSetter(ScatterBaseParameterSetter):
ANCHOR_LABEL = "Anchor"
def __init__(self, master):
super().__init__(master)
self.anchor_font = QFont()
def update_setters(self):
super().update_setters()
self.initial_settings[self.LABELS_BOX].update({
self.ANCHOR_LABEL: self.FONT_SETTING
})
def update_anchors(**settings):
self.anchor_font = Updater.change_font(self.anchor_font, settings)
self.master.update_anchors()
self._setters[self.LABELS_BOX][self.ANCHOR_LABEL] = update_anchors
class OWGraphWithAnchors(OWScatterPlotBase):
"""
Graph for projections in which dimensions can be manually moved
Class is used as a graph base class for OWFreeViz and OWRadviz."""
DISTANCE_DIFF = 0.08
def __init__(self, scatter_widget, parent, view_box=DraggableItemsViewBox):
super().__init__(scatter_widget, parent, view_box)
self.anchor_items = None
self.circle_item = None
self.indicator_item = None
self._tooltip_delegate = MouseEventDelegate(self.help_event,
self.show_indicator_event)
self.plot_widget.scene().installEventFilter(self._tooltip_delegate)
self.parameter_setter = AnchorParameterSetter(self)
def clear(self):
super().clear()
self.anchor_items = None
self.circle_item = None
self.indicator_item = None
def update_coordinates(self):
super().update_coordinates()
if self.scatterplot_item is not None:
self.update_anchors()
self.update_circle()
self.set_view_box_range()
self.view_box.setAspectLocked(True, 1)
def update_anchors(self):
raise NotImplementedError
def update_circle(self):
if self.scatterplot_item is not None and not self.circle_item:
self.circle_item = QGraphicsEllipseItem()
self.circle_item.setRect(QRectF(-1, -1, 2, 2))
color = self.plot_widget.palette().color(QPalette.Text)
self.circle_item.setPen(pg.mkPen(color, width=2))
self.plot_widget.addItem(self.circle_item)
def reset_button_clicked(self):
self.set_view_box_range()
def set_view_box_range(self):
raise NotImplementedError
def closest_draggable_item(self, pos):
return None
def show_indicator(self, anchor_idx):
self._update_indicator_item(anchor_idx)
def show_indicator_event(self, ev):
scene = self.plot_widget.scene()
if self.scatterplot_item is None or scene.drag_tooltip.isVisible():
return False
if self.view_box.mouse_state == 1:
return True
pos = self.scatterplot_item.mapFromScene(ev.scenePos())
anchor_idx = self.closest_draggable_item(pos)
if anchor_idx is not None:
self._update_indicator_item(anchor_idx)
if self.view_box.mouse_state == 0:
self.view_box.setCursor(Qt.OpenHandCursor)
else:
if self.indicator_item is not None:
self.plot_widget.removeItem(self.indicator_item)
self.indicator_item = None
self.view_box.setCursor(Qt.ArrowCursor)
return True
def _update_indicator_item(self, anchor_idx):
if self.indicator_item is not None:
self.plot_widget.removeItem(self.indicator_item)
self._add_indicator_item(anchor_idx)
def _add_indicator_item(self, anchor_idx):
pass
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