Function light_phylogeny::get_chemin_transfer

pub fn get_chemin_transfer(
    x1: f32, 
    y1: f32, 
    x2: f32, 
    y2: f32, 
    c: String, 
    o: String, 
    b: f32, 
    stroke: i32
) -> Path

Draw a transfer path between x1,y1 and x2,y2.