#ifndef SoSimplifyIncluded
#define SoSimplifyIncluded

library SoSimplify needs SoBase initializer SimplifySetup

    // 坐标间距
    /*
    求 (x1, y1) 到 (x2, y2) 的距离
    */
	function SoSpacing takes real x1, real y1, real x2, real y2 returns real
        local real fx = x2 - x1
        local real fy = y2 - y1
        return SquareRoot(fx * fx + fy * fy)
	endfunction

	// 坐标间方向
    /* 参数: x1, y1, x2, y2
    求 (x1, y1) 到 (x2, y2) 的方向
    */
	function SoC2A takes real x1, real y1, real x2, real y2 returns real
        return bj_RADTODEG * Atan2(y2 - y1, x2 - x1)
	endfunction

    /* 取绝对值 */
	private function SRabs takes real a returns real
        if (a<0) then
            return -a
        else
            return a
        endif
    endfunction

    //三点所在的矩形面积
    function SoGetRectAera takes real xa,real ya,real xb,real yb,real xc,real yc returns real
        return SRabs( xa*yb - xa*yc + xb*yc - xb*ya + xc*ya - xc*yb )
    endfunction

    function SoSimplifySetup takes nothing returns nothing
        // 初始化一些设置
    endfunction

endlibrary

#endif //SoSimplifyIncluded