Canvas Scene (scene
)¶
Canvas Graphics Scene¶
-
class
orangecanvas.canvas.scene.
CanvasScene
(*args, **kwargs)¶ Bases:
PyQt4.QtGui.QGraphicsScene
A Graphics Scene for displaying an
Scheme
instance.-
node_item_added
(NodeItem)¶ Signal emitted when a
NodeItem
has been added to the scene.
-
node_item_removed
(NodeItem)¶ Signal emitted when a
NodeItem
has been removed from the scene.
-
link_item_added
(LinkItem)¶ Signal emitted when a new
LinkItem
has been added to the scene.
-
link_item_removed
(LinkItem)¶ Signal emitted when a
LinkItem
has been removed.
-
annotation_added
(Annotation)¶ Signal emitted when a
Annotation
item has been added.
-
annotation_removed
(Annotation)¶ Signal emitted when a
Annotation
item has been removed.
-
node_item_position_changed
(NodeItem, QPointF)¶ Signal emitted when the position of a
NodeItem
has changed.
-
node_item_double_clicked
(NodeItem)¶ Signal emitted when an
NodeItem
has been double clicked.
-
node_item_activated
(NodeItem)¶ An node item has been activated (clicked)
-
node_item_hovered
(NodeItem)¶ An node item has been hovered
-
link_item_hovered
(LinkItem)¶ Link item has been hovered
-
clear_scene
()¶ Clear (reset) the scene.
-
set_scheme
(scheme)¶ Set the scheme to display. Populates the scene with nodes and links already in the scheme. Any further change to the scheme will be reflected in the scene.
Parameters: scheme ( Scheme
) –
-
set_registry
(registry)¶ Set the widget registry.
-
set_anchor_layout
(layout)¶ Set an
AnchorLayout
-
anchor_layout
()¶ Return the anchor layout instance.
-
set_channel_names_visible
(visible)¶ Set the channel names visibility.
-
channel_names_visible
()¶ Return the channel names visibility state.
-
set_node_animation_enabled
(enabled)¶ Set node animation enabled state.
-
add_node
(node)¶ Add and return a default constructed
NodeItem
for aSchemeNode
instance node. If the node is already in the scene do nothing and just return its item.
-
new_node_item
(widget_desc, category_desc=None)¶ Construct an new
NodeItem
from a WidgetDescription. Optionally also set CategoryDescription.
-
remove_node
(node)¶ Remove the
NodeItem
instance that was previously constructed for aSchemeNode
node using the add_node method.
-
add_link
(scheme_link)¶ Create and add a
LinkItem
instance for aSchemeLink
instance. If the link is already in the scene do nothing and just return itsLinkItem
.
-
new_link_item
(source_item, source_channel, sink_item, sink_channel)¶ Construct and return a new
LinkItem
-
remove_link
(scheme_link)¶ Remove a
LinkItem
instance that was previously constructed for aSchemeLink
instance link using the add_link method.
-
add_annotation_item
(annotation)¶ Add an
Annotation
item to the scene.
-
add_annotation
(scheme_annot)¶ Create a new item for
SchemeAnnotation
and add it to the scene. If the scheme_annot is already in the scene do nothing and just return its item.
-
remove_annotation_item
(annotation)¶ Remove an
Annotation
instance from the scene.
-
remove_annotation
(scheme_annotation)¶ Remove an
Annotation
instance that was previously added usingadd_anotation()
.
-
annotation_items
()¶ Return all
Annotation
items in the scene.
-
commit_scheme_node
(node)¶ Commit the node into the scheme.
-
commit_scheme_link
(link)¶ Commit a scheme link.
-
node_for_item
(item)¶ Return the SchemeNode for the item.
-
item_for_node
(node)¶ Return the
NodeItem
instance for aSchemeNode
.
-
link_for_item
(item)¶ Return the SchemeLink for `item (
LinkItem
).
-
item_for_link
(link)¶ Return the
LinkItem
for aSchemeLink
-
selected_node_items
()¶ Return the selected
NodeItem
‘s.
-
selected_annotation_items
()¶ Return the selected
Annotation
‘s
-
node_links
(node_item)¶ Return all links from the node_item (
NodeItem
).
-
node_output_links
(node_item)¶ Return a list of all output links from node_item.
-
node_input_links
(node_item)¶ Return a list of all input links for node_item.
-
neighbor_nodes
(node_item)¶ Return a list of node_item‘s (class:NodeItem) neighbor nodes.
-
item_at
(pos, type_or_tuple=None, buttons=0)¶ Return the item at pos that is an instance of the specified type (type_or_tuple). If buttons (Qt.MouseButtons) is given only return the item if it is the top level item that would accept any of the buttons (QGraphicsItem.acceptedMouseButtons).
-
-
orangecanvas.canvas.scene.
grab_svg
(scene)¶ Return a SVG rendering of the scene contents.
Parameters: scene ( CanvasScene
) –