Function fltk::draw::draw_xyline3

pub fn draw_xyline3(x: i32, y: i32, x1: i32, y2: i32, x3: i32)

Draws a horizontal line from (x,y) to (x1,y), then a vertical from (x1,y) to (x1,y2) and then another horizontal from (x1,y2) to (x3,y2)