<｜begin▁of▁sentence｜>### Instruction:
Suppose you have a tree graph with 5 nodes generated as `Graph.Tree(5, 2)`. Can you use the LightToDarkEdgeDrawer in igraph to draw directed edges of this tree graph with varying opacity, so that the edge starts with full transparency at the source and reaches full opacity at the destination?
### Response:
import igraph as ig
import cairo

# Load a graph
g = ig.Graph.Tree(5, 2)

# Initialize Cairo context
cairo_context = cairo.Context(cairo.ImageSurface(cairo.FORMAT_ARGB32, 600, 400))

# Set up the visual style for the graph
visual_style = {
    'vertex_color': 'white',
    'vertex_size': 20,
    'vertex_label': g.vs['name']
}

# Create a LightToDarkEdgeDrawer object
edge_drawer = ig.drawing.cairo.LightToDarkEdgeDrawer(cairo_context)

# Draw the graph edges using the custom edge drawer
for edge in g.es:
    source_pos = g.vs[edge.source]['coords']
    target_pos = g.vs[edge.target]['coords']
    edge_drawer.draw_directed_edge(source_pos, target_pos, alpha=0.5)
    
# Save the output
cairo_context.get_target().write_to_png('graph_with_light_to_dark_edges.png')
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