showcase6.cpp File Reference

Generates a circle from 2/3 points. More...

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

Include dependency graph for showcase6.cpp:

Functions
int	main (int, const char **)

Detailed Description

Generates a circle from 2/3 points.

Function Documentation

main()

int main	(	int	,
		const char **
	)

{
    auto nbim = 25; // nb images
    auto Hdraw = Homogr().setScale(30).addTranslation(10,10);

    auto x0 = 3.;
    auto k=1.8;

    Point2d p1( 2, 4 );
    Point2d p2( 6, 5 );
    Segment seg( 1., 1., 4.5, 2.8 );

    for( int i=0; i<nbim; i++ )
    {
        auto angle = i*360./nbim;
        auto angle_r = angle * M_PI / 180.;
        auto x1 = std::cos(angle_r)*k;
        auto y1 = std::sin(angle_r)*k;

        Point2d p0( x1+x0, y1+x0);
        std::vector<Point2d> v1{ p1, p2, p0 };
        std::vector<Point2d> v2{ p1, p0     };
        Circle cir1( p0,p1,p2);
        Circle cir2( p0,p1 );

        auto v1d = Hdraw * v1;
        auto v2d = Hdraw * v2;

        auto cir1d = Hdraw * cir1;
        auto cir2d = Hdraw * cir2;
        auto segd  = Hdraw * seg;

        Image<img::SvgImage> im1( 250, 200 );

        auto dpinter= DrawParams().setPointStyle( PtStyle::Diam ).setColor( 20,250,20 );
        auto int1 = cir1.intersects( seg );
        auto int2 = cir2.intersects( seg );
        if( int1() )
            for( const auto pt: int1.get() )
                draw( im1, Hdraw * pt, dpinter );
        if( int2() )
            for( const auto pt: int2.get() )
                draw( im1, Hdraw * pt, dpinter );

        draw( im1, v1d );
        cir2d.getBB().draw( im1, DrawParams().setColor(150,200,200) );

        segd.draw( im1, DrawParams().setColor(50,50,150) );
        cir1d.draw( im1, DrawParams().setColor(250,0,0) );
        cir2d.draw( im1, DrawParams().setColor(0,0,250) );

        std::ostringstream ossa;
        ossa << "showcase6_" << std::setfill('0') << std::setw(2) << i << ".svg";
        im1.write( ossa.str() );
    }
}

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