Function LineError

Splines.cpp:1111–1141

namespace
{
    float LineError(const Spline2& s)  // Calculate line approx error as max distance of hull points p1/p2 from p0_p1
    {
        Vec2f p0 = { s.xb.x, s.yb.x };
        Vec2f p1 = { s.xb.y, s.yb.y };
        Vec2f p2 = { s.xb.z, s.yb.z };
        Vec2f p3 = { s.xb.w, s.yb.w };

        Vec2f w = p3 - p0;
        float dww = dot(w, w);

        Vec2f v1 = p1 - p0;
        float dvw1 = dot(v1, w);
        Vec2f v2 = p2 - p0;
        float dvw2 = dot(v2, w);

        float error;

        if (dvw1 <= 0.0f)
            error = sqrlen(v1);
        else if (dvw1 >= dww)
            error = sqrlen(p1 - p3);
        else
            error = sqrlen((dvw1 / dww) * w - v1);

        if (dvw2 <= 0.0f)
            return vl_max(error, sqrlen(v2));
        else if (dvw2 >= dww)
            return vl_max(error, sqrlen(p2 - p3));
        else
            return vl_max(error, sqrlen((dvw2 / dww) * w - v2));
    }
}

int SL::SplinesToLinesAdaptive(int numSplines, const Spline2 splines[], tEmitLinesFunc2 emitLines, void* context, float tolerance)