Function webrender::clip::is_left_of_line

pub fn is_left_of_line(
    p_x: f32,
    p_y: f32,
    p0_x: f32,
    p0_y: f32,
    p1_x: f32,
    p1_y: f32,
) -> f32

Test where point p is relative to the infinite line that passes through the segment defined by p0 and p1. Point p is on the “left” of the line if the triangle (p0, p1, p) forms a counter-clockwise triangle.

0 is left of the line < 0 is right of the line == 0 is on the line