Transform from coordinates in the XY-plane to graphics coordinates. More...

Collaboration diagram for MBMesquite::MeshWriter::Transform2D:

Public Member Functions
	Transform2D (PatchData *pd, Projection &proj, unsigned width, unsigned height, bool flip_about_horizontal)
	Transform2D (const Vector3D *verts, size_t num_vert, Projection &projection, unsigned width, unsigned height)
void	transform (const Vector3D &coords, int &horizontal, int &vertical) const
int	max_horizontal () const
int	max_vertical () const
Private Attributes
Projection &	myProj
float	myScale
int	horizOffset
int	vertOffset
int	horizMax
int	vertMax
int	vertSign

Detailed Description

Transform from coordinates in the XY-plane to graphics coordinates.

Definition at line 59 of file MeshWriter.cpp.

Constructor & Destructor Documentation

MBMesquite::MeshWriter::Transform2D::Transform2D	(	PatchData *	pd,
		Projection &	proj,
		unsigned	width,
		unsigned	height,
		bool	flip_about_horizontal
	)

Definition at line 602 of file MeshWriter.cpp.

References MBMesquite::PatchData::get_vertex_array(), horizMax, horizOffset, myProj, myScale, MBMesquite::PatchData::num_nodes(), MBMesquite::MeshWriter::Projection::project(), vertMax, and vertOffset.

        : myProj( projection ), vertSign( flip ? -1 : 1 )
    {
        // Get the bounding box of the projected points
        float w_max, w_min, h_max, h_min;
        w_max = h_max = -std::numeric_limits< float >::max();
        w_min = h_min = std::numeric_limits< float >::max();
        MsqError err;
        const MsqVertex* verts = pd->get_vertex_array( err );
        const size_t num_vert  = pd->num_nodes();
        for( unsigned i = 0; i < num_vert; ++i )
        {
            float w, h;
            myProj.project( verts[i], w, h );
            if( w > w_max ) w_max = w;
            if( w < w_min ) w_min = w;
            if( h > h_max ) h_max = h;
            if( h < h_min ) h_min = h;
        }

        // Determine the scale factor
        const float w_scale = (float)width / ( w_max - w_min );
        const float h_scale = (float)height / ( h_max - h_min );
        myScale             = w_scale > h_scale ? h_scale : w_scale;

        // Determine offset
        horizOffset = -(int)( myScale * w_min );
        vertOffset  = -(int)( myScale * ( flip ? -h_max : h_min ) );

        // Determine bounding box
        horizMax = (int)( w_max * myScale ) + horizOffset;
        vertMax  = (int)( ( flip ? -h_min : h_max ) * myScale ) + vertOffset;
    }

MBMesquite::MeshWriter::Transform2D::Transform2D	(	const Vector3D *	verts,
		size_t	num_vert,
		Projection &	projection,
		unsigned	width,
		unsigned	height
	)

Definition at line 636 of file MeshWriter.cpp.

References horizMax, horizOffset, myProj, myScale, MBMesquite::MeshWriter::Projection::project(), vertMax, and vertOffset.

        : myProj( projection ), vertSign( 1 )
    {
        // Get the bounding box of the projected points
        float w_max, w_min, h_max, h_min;
        w_max = h_max = -std::numeric_limits< float >::max();
        w_min = h_min = std::numeric_limits< float >::max();
        for( unsigned i = 0; i < num_vert; ++i )
        {
            float w, h;
            myProj.project( verts[i], w, h );
            if( w > w_max ) w_max = w;
            if( w < w_min ) w_min = w;
            if( h > h_max ) h_max = h;
            if( h < h_min ) h_min = h;
        }

        // Determine the scale factor
        const float w_scale = (float)width / ( w_max - w_min );
        const float h_scale = (float)height / ( h_max - h_min );
        myScale             = w_scale > h_scale ? h_scale : w_scale;

        // Determine offset
        horizOffset = -(int)( myScale * w_min );
        vertOffset  = -(int)( myScale * h_min );

        // Determine bounding box
        horizMax = (int)( w_max * myScale ) + horizOffset;
        vertMax  = (int)( h_max * myScale ) + vertOffset;
    }

Member Function Documentation

int MBMesquite::MeshWriter::Transform2D::max_horizontal ( ) const [inline]

Definition at line 68 of file MeshWriter.cpp.

Referenced by MBMesquite::MeshWriter::write_eps(), MBMesquite::MeshWriter::write_eps_triangle(), and MBMesquite::MeshWriter::write_svg().

        {
            return horizMax;
        }

int MBMesquite::MeshWriter::Transform2D::max_vertical ( ) const [inline]

Definition at line 72 of file MeshWriter.cpp.

Referenced by MBMesquite::MeshWriter::write_eps(), MBMesquite::MeshWriter::write_eps_triangle(), and MBMesquite::MeshWriter::write_svg().

        {
            return vertMax;
        }

void MBMesquite::MeshWriter::Transform2D::transform	(	const Vector3D &	coords,
		int &	horizontal,
		int &	vertical
	)		const

Definition at line 671 of file MeshWriter.cpp.

References horizOffset, myProj, myScale, MBMesquite::MeshWriter::Projection::project(), vertOffset, and vertSign.

Referenced by MBMesquite::MeshWriter::write_eps(), MBMesquite::MeshWriter::write_eps_quadratic_edge(), MBMesquite::MeshWriter::write_eps_triangle(), and MBMesquite::MeshWriter::write_svg().

    {
        float horiz, vert;
        myProj.project( coords, horiz, vert );
        horizontal = (int)( myScale * horiz ) + horizOffset;
        vertical   = vertSign * (int)( myScale * vert ) + vertOffset;
    }