GetLineAngle

Calculates the angle of two straight lines

int GetLineAngle(
        const double    *coefficient,
        double          *angle
)

Parameters

*coefficient	Straight line element
*angle	Angle (Measurement result)

Return Value

NORMAL(0): Successful completion

Otherwise: Unsuccessful completion

Description

Calculates and stores the angle(degree) of two straight lines.

The range of the angle is -90 to 90.

Notes

Returns ERROR when 2 straight lines are the pararells.

The straight line is specified a,b,c as for a straight line expression ax + by + c = 0. It is stored in coefficient[0], coefficient[1], and coefficient [2] respectively.