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angle

Function angle 

Source
pub fn angle(
    a1: &PointExpr,
    b1: &PointExpr,
    a2: &PointExpr,
    b2: &PointExpr,
    theta: f64,
) -> Vec<Row>
Expand description

Signed angle from segment 1 to segment 2 equals theta (radians). The residual is the wrapped angle difference, smooth everywhere except at ±π.