igraph.drawing.cairo.edge.AlphaVaryingEdgeDrawer

class documentation

class AlphaVaryingEdgeDrawer(AbstractCairoEdgeDrawer): (source)

Known subclasses: igraph.drawing.cairo.edge.DarkToLightEdgeDrawer, igraph.drawing.cairo.edge.LightToDarkEdgeDrawer

Constructor: AlphaVaryingEdgeDrawer(context, palette, alpha_at_src, alpha_at_dest)

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Edge drawer implementation that draws undirected edges as straight lines and directed edges by varying the alpha value of the specified edge color between the source and the destination.

Method __init__ Constructs the edge drawer.
Method draw_directed_edge Draws a directed edge.
Instance Variable alpha_at_dest Undocumented
Instance Variable alpha_at_src Undocumented

Inherited from AbstractCairoEdgeDrawer:

Method draw_loop_edge Draws a loop edge.
Method draw_undirected_edge Draws an undirected edge.
Instance Variable context Undocumented
Instance Variable palette Undocumented
Instance Variable VisualEdgeBuilder Undocumented
Method _construct_visual_edge_builder Construct the visual edge builder that will collect the visual attributes of an edge when it is being drawn.

Inherited from AbstractEdgeDrawer (via AbstractCairoEdgeDrawer):

Method get_label_position Returns the position where the label of an edge should be drawn. the default implementation returns the midpoint of the edge and an alignment that tries to avoid overlapping the label with the edge.
Method get_label_rotation Get the rotation angle of the label to align with the edge.
Static Method _curvature_to_float Converts values given to the 'curved' edge style argument in plotting calls to floating point values.
def __init__(self, context, palette, alpha_at_src, alpha_at_dest): (source)
overrides igraph.drawing.cairo.edge.AbstractCairoEdgeDrawer.__init__
overridden in igraph.drawing.cairo.edge.DarkToLightEdgeDrawer, igraph.drawing.cairo.edge.LightToDarkEdgeDrawer

Constructs the edge drawer.

Parameters
contexta Cairo context on which the edges will be drawn.
palettethe palette that can be used to map integer color indices to colors when drawing edges
alpha_at_srcUndocumented
alpha_at_destUndocumented
def draw_directed_edge(self, edge, src_vertex, dest_vertex): (source)
overrides igraph.drawing.baseclasses.AbstractEdgeDrawer.draw_directed_edge

Draws a directed edge.

Parameters
edgethe edge to be drawn. Visual properties of the edge are defined by the attributes of this object.
src_vertexthe source vertex. Visual properties are defined by the attributes of this object.
dest_vertexthe source vertex. Visual properties are defined by the attributes of this object.
alpha_at_dest = (source)

Undocumented

alpha_at_src = (source)

Undocumented