Utility Functions

The rxe.flow.util module provides utility functions for working with Flow components.

These functions are used to calculate the path for an edge.

• get_simple_bezier_path(source_x, source_y, target_x, target_y, source_position="bottom", target_position="top"): Returns everything you need to render a simple bezier edge between two nodes.
• get_bezier_path(source_x, source_y, target_x, target_y, source_position="bottom", target_position="top", curvature=0.5): Returns everything you need to render a bezier edge between two nodes.
• get_straight_path(source_x, source_y, target_x, target_y): Calculates the straight line path between two points.
• get_smooth_step_path(source_x, source_y, target_x, target_y, source_position="bottom", target_position="top", border_radius=5, center_x=None, center_y=None, offset=20, step_position=0.5): Returns everything you need to render a stepped path between two nodes.

These functions are used to apply changes to nodes and edges from the on_nodes_change and on_edges_change event handlers.

• apply_node_changes(nodes, changes): Applies changes to nodes in the flow.
• apply_edge_changes(edges, changes): Applies changes to edges in the flow.

• add_edge(params, edges): Creates a new edge in the flow.

• get_incomers(node_id, nodes, edges): Returns all incoming nodes connected to the given node.
• get_outgoers(node_id, nodes, edges): Returns all outgoing nodes connected to the given node.
• get_connected_edges(nodes, edges): Returns all edges connected to the given nodes.