showcase7.cpp File Reference

shows isInside circles vs polyline More...

#include "../../homog2d.hpp"

Include dependency graph for showcase7.cpp:

Functions
int	main (int, const char **)

Detailed Description

shows isInside circles vs polyline

Function Documentation

main()

int main	(	int	,
		const char **
	)

{
    auto n = 25; // nb images
    Circle cir( 3. );

    std::vector<Point2d> vpts{
        { -1.0,  1.0 },
        { -1.2, -0.7 },
        {  1.8, -0.5 },
        {  1.6,  1.1 },
        {  0.5,  0.8 }
    };
    CPolyline pl( vpts );

    auto Hdraw = Homogr().addTranslation(7,6).addScale(15);

    img::Image<img::SvgImage> im( 300, 200 );

    auto col_outside = img::DrawParams().setColor(50,20,200);
    auto col_inside  = img::DrawParams().setColor(200,20,20).setThickness(2);
    auto coeff_x = 1.12;
    auto coeff_y = 1.16;
    Homogr H1 = Homogr().addScale(    coeff_x,    coeff_y );
    Homogr H2 = Homogr().addScale( 1./coeff_x, 1./coeff_y );

    for( int i=0; i<n; i++ )
    {
        im.clear();
        auto pl2  = Hdraw * pl;
        auto cir2 = Hdraw * cir;

        auto col_c = col_outside;
        if( cir.isInside( pl ) )
            col_c = col_inside;

        auto col_p = col_outside;
        if( pl.isInside( cir ) )
            col_p = col_inside;

        pl2.draw( im, col_p );
        cir2.draw( im, col_c );

        auto inter =  cir.intersects(pl);
        if( inter() )
        {
            auto inter_pts = inter.get();
            for( const auto& pt: inter.get() )
            {
                auto pt2 = Hdraw * pt;
                pt2.draw( im );
            }
        }
        if( i<n/2 )
            pl = H1*pl;
        else
            pl = H2*pl;

        std::ostringstream oss;
        oss << "showcase7_" << std::setfill('0') << std::setw(2) <<i << ".svg";
        im.write( oss.str() );
    }
}

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