def draw_directed_edge(self, edge, src_vertex, dest_vertex):
if src_vertex == dest_vertex: # TODO
return self.draw_loop_edge(edge, src_vertex)
src_pos, dest_pos = src_vertex.position, dest_vertex.position
ctx = self.context
# Set up the gradient
lg = LinearGradient(src_pos[0], src_pos[1], dest_pos[0], dest_pos[1])
edge_color = edge.color[:3] + self.alpha_at_src
edge_color_end = edge_color[:3] + self.alpha_at_dest
lg.add_color_stop_rgba(0, *edge_color)
lg.add_color_stop_rgba(1, *edge_color_end)
# Draw the edge
ctx.set_source(lg)
ctx.set_line_width(edge.width)
ctx.move_to(*src_pos)
ctx.line_to(*dest_pos)
ctx.stroke()
def draw_directed_edge(self, edge, src_vertex, dest_vertex):
if src_vertex == dest_vertex: # TODO
return self.draw_loop_edge(edge, src_vertex)
src_pos, dest_pos = src_vertex.position, dest_vertex.position
ctx = self.context
# Set up the gradient
lg = LinearGradient(src_pos[0], src_pos[1], dest_pos[0], dest_pos[1])
edge_color = edge.color[:3] + self.alpha_at_src
edge_color_end = edge_color[:3] + self.alpha_at_dest
lg.add_color_stop_rgba(0, *edge_color)
lg.add_color_stop_rgba(1, *edge_color_end)
# Draw the edge
ctx.set_source(lg)
ctx.set_line_width(edge.width)
ctx.move_to(*src_pos)
ctx.line_to(*dest_pos)
ctx.stroke()