pub fn dilate_triangle(
x1: f64,
y1: f64,
x2: f64,
y2: f64,
x3: f64,
y3: f64,
d: f64,
) -> ([f64; 6], [f64; 6])Expand description
Dilate a triangle by distance d, producing 6 output points
(two per edge). Returns ([x0..x5], [y0..y5]).