main/src/georegression/struct/line/LineParametric2D_F64.java
public void setAngle( double angle ) {
		slope.set( Math.cos( angle ), Math.sin( angle ) );
	}
public void setAngle( double angle ) {
		slope.set( Math.cos( angle ), Math.sin( angle ) );
	}
Sets the slope to the unit vector specified by the provided angle.

@param angle Angle of the line specified in radians.