GetLineSide

Check of inside/outside between the straight line and point

int     GetLineSide(
        const double    *coefficient,
        const double    posX,
        const double    posY,
        const double    stdPosX,
        const double    stdPosY,
        int                     *side
)

Parameters

*coefficient	Straight line element
posX	Coordinates X
posY	Coordinates Y
stdPosX	Reference coordinates X
stdPosY	Reference coordinates Y
*side	Judgement of inside/outside (Measurement result)

Return Value

NORMAL(0): Successful completion

Otherwise: Unsuccessful completion

Description

Calculates whether the input point to be on the inside in view of the reference point or to exist on the outside.

The folloing value is stred to variable [side]

0:on the line 1:inside 2:output

Notes

Returns ERROR when the reference point is on the line.

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.