C++ (Cpp) TRIPLET_3D примеры использования

Пример #1

Файл: vrml_board.cpp Проект: jerkey/kicad

// add a triangular facet (triplet) to the ouptut index list
bool VRML_LAYER::addTriplet( VERTEX_3D* p0, VERTEX_3D* p1, VERTEX_3D* p2 )
{
    double  dx0 = p1->x - p0->x;
    double  dx1 = p2->x - p0->x;

    double  dy0 = p1->y - p0->y;
    double  dy1 = p2->y - p0->y;

    // this number is chosen because we shall only write 6 decimal places
    // on the VRML output
    double err = 0.000001;

    // test if the triangles are degenerate (parallel sides)

    if( dx0 < err && dx0 > -err && dx1 < err && dx1 > -err )
        return false;

    if( dy0 < err && dy0 > -err && dy1 < err && dy1 > -err )
        return false;

    double  sl0 = dy0 / dx0;
    double  sl1 = dy1 / dx1;

    double dsl = sl1 - sl0;

    if( dsl < err && dsl > -err )
        return false;

    triplets.push_back( TRIPLET_3D( p0->o, p1->o, p2->o ) );

    return true;
}

Пример #2

Файл: vrml_layer.cpp Проект: PatMart/kicad-source-mirror

// add a triangular facet (triplet) to the ouptut index list
bool VRML_LAYER::addTriplet( VERTEX_3D* p0, VERTEX_3D* p1, VERTEX_3D* p2 )
{
    double  dx0 = p1->x - p0->x;
    double  dx1 = p2->x - p0->x;
    double  dx2 = p2->x - p1->x;

    double  dy0 = p1->y - p0->y;
    double  dy1 = p2->y - p0->y;
    double  dy2 = p2->y - p1->y;

    dx0 *= dx0;
    dx1 *= dx1;
    dx2 *= dx2;

    dy0 *= dy0;
    dy1 *= dy1;
    dy2 *= dy2;

    // this number is chosen because we shall only write 9 decimal places
    // at most on the VRML output
    double err = 0.000000001;

    // test if the triangles are degenerate (equal points)
    if( ( dx0 + dy0 ) < err )
        return false;

    if( ( dx1 + dy1 ) < err )
        return false;

    if( ( dx2 + dy2 ) < err )
        return false;

    triplets.push_back( TRIPLET_3D( p0->o, p1->o, p2->o ) );

    return true;
}