C++ math::Vector2类代码示例

void
MeshBase::setVertex(int i, const Math::Vector2 &v)
{
	if (!m_vdata->set(i, v.x(), v.y()))
		MMWARNING("Failed to assign values (%f, %f) to vertex %d",
		    v.x(), v.y(), i);
}

    void RendererPlplot::draw_point(const math::Vector2 &v, const Rgb &rgb, enum PointStyle s)
    {
      int code;

      _pls->col0(get_color_id(rgb));

      switch (s)
        {
        default:
        case PointStyleDot:
          code = 1;
          break;

        case PointStyleCross:
          code = 2;
          break;

        case PointStyleRound:
          code = 4;
          break;

        case PointStyleSquare:
          code = 6;
          break;

        case PointStyleTriangle:
          code = 11;
          break;
        }

      PLFLT x = v.x(), y = v.y();
      _pls->poin(1, &x, &y, code);
    }

Containers::Array<char> StbPngImageConverter::doExportToData(const ImageView2D& image) {
    #ifndef MAGNUM_TARGET_GLES
    if(image.storage().swapBytes()) {
        Error() << "Trade::StbPngImageConverter::exportToData(): pixel byte swap is not supported";
        return nullptr;
    }
    #endif

    if(image.type() != PixelType::UnsignedByte) {
        Error() << "Trade::StbPngImageConverter::exportToData(): unsupported pixel type" << image.type();
        return nullptr;
    }

    Int components;
    switch(image.format()) {
        #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
        case PixelFormat::Red:
        #endif
        #ifdef MAGNUM_TARGET_GLES2
        case PixelFormat::Luminance:
        #endif
            components = 1;
            break;
        #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
        case PixelFormat::RG:
        #endif
        #ifdef MAGNUM_TARGET_GLES2
        case PixelFormat::LuminanceAlpha:
        #endif
            components = 2;
            break;
        case PixelFormat::RGB: components = 3; break;
        case PixelFormat::RGBA: components = 4; break;
        default:
            Error() << "Trade::StbPngImageConverter::exportToData(): unsupported pixel format" << image.format();
            return nullptr;
    }

    /* Data properties */
    std::size_t offset;
    Math::Vector2<std::size_t> dataSize;
    std::tie(offset, dataSize, std::ignore) = image.dataProperties();

    /* Reverse rows in image data */
    Containers::Array<unsigned char> reversedData{image.data().size()};
    for(Int y = 0; y != image.size().y(); ++y) {
        std::copy(image.data<unsigned char>() + offset + y*dataSize.x(), image.data<unsigned char>() + offset + (y + 1)*dataSize.x(), reversedData + (image.size().y() - y - 1)*dataSize.x());
    }

    Int size;
    unsigned char* const data = stbi_write_png_to_mem(reversedData, dataSize.x(), image.size().x(), image.size().y(), components, &size);
    CORRADE_INTERNAL_ASSERT(data);

    /* Wrap the data in an array with custom deleter (we can't use delete[]) */
    Containers::Array<char> fileData{reinterpret_cast<char*>(data), std::size_t(size),
        [](char* data, std::size_t) { std::free(data); }};

    return fileData;
}

 void RendererPlplot::draw_circle(const math::Vector2 &c, double r,
                                  const Rgb &rgb, bool filled)
 {
   _pls->col0(get_color_id(rgb));
   std::cout << "draw_circle was not tested (added 8th parameter to compile" << std::endl;
   exit(-1);
   _pls->arc(c.x(), c.y(), r, r, 0., 360., 360., filled);
 }

Math::VectorPair2 TRegularPolygon::get_edge(const Math::Vector2 &point) const
{
    // find sector start angle
    double a = Math::lp_floor(atan2(point.y(), point.x()) - _angle, (double)_edge_cnt / (2.0 * M_PI));

    // find sector edge coordinates
    return Math::VectorPair2(_radius * cos(_angle + a), _radius * sin(_angle + a),
                             _radius * cos(_angle + a + _a_step), _radius * sin(_angle + a + _a_step));
}

void TCurveBase::normal(Math::Vector3 &normal, const Math::Vector3 &point) const
{
    Math::Vector2 d;

    derivative(point.project_xy(), d);

    normal = Math::Vector3(d.x(), d.y(), -1.0);
    normal.normalize();
}

	void Block::Draw(sf::RenderTarget& renderTarget) {
		MATH::Vector2 position = GetPosition();

		if(_highlight) {
			_blockSprite.SetColor(_color + sf::Color(255, 255, 255, 255 * sinf(_highlightPhase)));
			position -= MATH::Vector2(0.0f, 5.0f * sinf(_highlightPhase));
		}

		_blockSprite.SetPosition(position.sfVec());
		renderTarget.Draw(_blockSprite);
	}

    void RendererPlplot::draw_text(const math::Vector2 &c, const math::Vector2 &dir,
                                   const std::string &str, TextAlignMask a, int size, const Rgb &rgb)
    {
      double j = .5;

      if (a & TextAlignLeft)
        j = 0.;
      else if (a & TextAlignRight)
        j = 1.;

      _pls->schr(size/3., 1.);
      _pls->col0(get_color_id(rgb));
      _pls->ptex(c.x(), c.y(), dir.x(), dir.y(), j, str.c_str());
    }

bool
BounceColliderComponent::collision(ColliderComponent &c, float d, const CollisionData &data)
{
	MMUNUSED(c);
	MMUNUSED(d);
	MMUNUSED(data);

	const Math::Vector2 &l_vel = movement()->velocity();
	const float l_mag = l_vel.magnitude();
	const Math::Vector2 l_normal = l_vel.normalized(l_mag);
	Math::Vector2 l_pvel = (l_normal * (2.f * l_normal.dot(l_vel * -1.f)) + l_vel);
	movement()->velocity() = l_pvel.normalize(l_pvel.magnitude()) * l_mag;

	return(true);
}

void EnemyAIBase::SetEnemyEyeSight( math::Vector2 eye )
{
	if( m_enemyMine ){
		eye.Normalize();
		m_enemyMine->m_eye = eye;
	}
}

bool TRegularPolygon::inside(const Math::Vector2 &point) const
{
    double d = Math::square(point.x()) + Math::square(point.y());

    // check against circumscribed circle
    if (d > Math::square(_radius))
        return false;

    // check against inscribed circle
    if (d < Math::square(_i_radius))
        return true;

    Math::VectorPair2 e(get_edge(point));

    return ((point.y() - e.y0()) * (e.x1() - e.x0()) -
            (point.x() - e.x0()) * (e.y1() - e.y0()) > 0);
}

template<UnsignedInt dimensions, class T> typename DimensionTraits<dimensions, T>::MatrixType aspectRatioFix(AspectRatioPolicy aspectRatioPolicy, const Math::Vector2<T>& projectionScale, const Vector2i& viewport) {
    /* Don't divide by zero / don't preserve anything */
    if(projectionScale.x() == 0 || projectionScale.y() == 0 || viewport.x() == 0 || viewport.y() == 0 || aspectRatioPolicy == AspectRatioPolicy::NotPreserved)
        return {};

    Math::Vector2<T> relativeAspectRatio = Math::Vector2<T>(viewport)*projectionScale;

    /* Extend on larger side = scale larger side down
       Clip on smaller side = scale smaller side up */
    return Camera<dimensions, T>::aspectRatioScale(
               (relativeAspectRatio.x() > relativeAspectRatio.y()) == (aspectRatioPolicy == AspectRatioPolicy::Extend) ?
               Vector2(relativeAspectRatio.y()/relativeAspectRatio.x(), T(1.0)) :
               Vector2(T(1.0), relativeAspectRatio.x()/relativeAspectRatio.y()));
}

template<UnsignedInt dimensions, class T> MatrixTypeFor<dimensions, T> aspectRatioFix(AspectRatioPolicy aspectRatioPolicy, const Math::Vector2<T>& projectionScale, const Vector2i& viewport) {
    /* Don't divide by zero / don't preserve anything */
    if(projectionScale.x() == 0 || projectionScale.y() == 0 || viewport.x() == 0 || viewport.y() == 0 || aspectRatioPolicy == AspectRatioPolicy::NotPreserved)
        return {};

    CORRADE_INTERNAL_ASSERT((projectionScale > Math::Vector2<T>(0)).all() && (viewport > Vector2i(0)).all());
    Math::Vector2<T> relativeAspectRatio = Math::Vector2<T>(viewport)*projectionScale;

    /* Extend on larger side = scale larger side down
       Clip on smaller side = scale smaller side up */
    return MatrixTypeFor<dimensions, T>::scaling(Math::Vector<dimensions, T>::pad(
        (relativeAspectRatio.x() > relativeAspectRatio.y()) == (aspectRatioPolicy == AspectRatioPolicy::Extend) ?
        Math::Vector2<T>(relativeAspectRatio.y()/relativeAspectRatio.x(), T(1)) :
        Math::Vector2<T>(T(1), relativeAspectRatio.x()/relativeAspectRatio.y()), T(1)));
}

bool GLVideo::DrawLine(const math::Vector2 &p1, const math::Vector2 &p2, const Color& color1, const Color& color2)
{
	if (GetLineWidth() <= 0.0f)
		return true;
	if (p1 == p2)
		return true;

	static const math::Vector2 offsetFix(0.5f, 0.5f);
	const math::Vector2 a(p1 + offsetFix), b(p2 + offsetFix);
	const math::Vector2 v2Dir = a - b;

	const float length = v2Dir.Length() + 0.5f;
	const float angle  = math::RadianToDegree(math::GetAngle(v2Dir));

	DrawRectangle(a, math::Vector2(GetLineWidth(), length),
				  color2, color2, color1, color1,
				  angle, Sprite::EO_CENTER_BOTTOM);
	return true;
}

void TCurveBase::derivative(const Math::Vector2 & xy, Math::Vector2 & dxdy) const
{
    double abserr;
    struct curve_gsl_params_s params;
    gsl_function gsl_func;

    gsl_func.params = &params;

    params.c = this;
    params.x = xy.x();
    params.y = xy.y();

    gsl_func.function = gsl_func_sagitta_x;
    gsl_deriv_central(&gsl_func, xy.x(), 1e-6, &dxdy.x(), &abserr);

    gsl_func.function = gsl_func_sagitta_y;
    gsl_deriv_central(&gsl_func, xy.y(), 1e-6, &dxdy.y(), &abserr);
}