How can I set the background color of a vertex?
I know there should be a property dictionary or something but I can't find an example.
I need it to color different kind of vertices in a bipartite graph:
gtdraw.graph_draw(g, pos=pos,
vertex_fill_color=part,
vertex_font_size=6,
output_size=(5000, 5000),
output="img/pic.png")
By background color of the vertex, i'm assuming you mean vertex_fill_color property.
The following code is taken from here
# Normalised RGB color.
# 0->Red, 1->Blue
red_blue_map = {0:(1,0,0,1),1:(0,0,1,1)}
# Create new vertex property
plot_color = g.new_vertex_property('vector<double>')
# add that property to graph
g.vertex_properties['plot_color'] = plot_color
# assign a value to that property for each node of that graph
for v in g.vertices():
plot_color[v] = red_blue_map[g.vertex_properties['value'][v]]
gt.graph_draw(g,
vertex_fill_color=g.vertex_properties['plot_color'])
The code is self explanatory.
A complete list of vertex properties can be found here. I am unsure of what you mean by 'background color'. If you want to add a halo effect on the vertices, you can set vertex_halo to True and use vertex_halo_color and vertex_halo_size to control the effect. If you just want to change the color of the vertex or the outline, you can use vertex_color and vertex_fill_color like you already are.
You can set the background color with the keyword argument vertex_fill_color, as you do it. Just check that part stores the vertex properties associated with the bipartite information (i.e. which part).
For a simple example you can take a look at the end of An Example: Building a Price Network which show how to draw a network where the vertex colors represent the age of the vertex, from older (red) to newer (black). Here is the illustration taken from this graph-tool example:
I hope this will help you.
