Function rotate

Returns a line that is rotated by angleRad. By default it rotates around its center, but an arbitrary origin point can be provided. If origin is a number, it's presumed to be a 0..1 percentage of the line.

// Rotates line by 0.1 radians around point 10,10
const r = Lines.rotate(line, 0.1, {x:10,y:10});

// Rotate line by 5 degrees around its center
const r = Lines.rotate(line, degreeToRadian(5));

// Rotate line by 5 degres around its end point
const r = Lines.rotate(line, degreeToRadian(5), line.b);

// Rotate by 90 degrees at the 80% position
const r = Lines.rotated = rotate(line, Math.PI / 2, 0.8);
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