showcase8.cpp File Reference

Generates rotating point and draw the orthogonal segment to a line. More...

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

Include dependency graph for showcase8.cpp:

Functions
int	main (int, const char **)

Detailed Description

Generates rotating point and draw the orthogonal segment to a line.

Function Documentation

main()

int main	(	int	,
		const char **
	)

{
    auto nbim = 25; // nb images
    auto Hdraw = Homogr().addTranslation(3,2).addScale(40);
    img::Image<img::SvgImage> im( 250, 200 );

    auto kx=1.5;
    auto ky=2.;
    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)*kx;
        auto y1 = std::sin(angle_r)*ky;
        Point2d pt( x1,y1);
        auto pt_d = Hdraw * pt;

        Segment seg( -.7, -.2, +.8, +.3 );
        auto li = seg.getLine();
        auto li_d = Hdraw * li;

        Segment seg2( -.9, +1.4, +.45, +1.0 );
        auto seg2_d = Hdraw * seg2;

        im.clear();
        pt_d.draw(   im, img::DrawParams().setColor(250,0,0) );
        li_d.draw(   im, img::DrawParams().setColor(0,250,0) );
        seg2_d.draw( im, img::DrawParams().setColor(250,0,0) );

        auto sego = li_d.getOrthogSegment( pt_d );
        sego.draw( im, img::DrawParams().setColor(20,0,250) );

        int segDistCase;
        auto dist = seg2_d.distTo( pt_d, &segDistCase );
        auto pts_seg2 = seg2_d.getPts();

        auto colA = img::DrawParams().setColor(250,250,0);
        auto colB = img::DrawParams().setColor(0,250,250);
        switch( segDistCase )
        {
            case -1:
                Segment( pt_d, pts_seg2.first ).draw( im, colA );
            break;
            case +1:
                Segment( pt_d, pts_seg2.second ).draw( im, colA );
            break;
            default:
                auto s = seg2_d.getLine().getOrthogSegment( pt_d );
                s.draw( im, colB );
        }

        std::ostringstream oss;
        oss << "showcase8_" << std::setfill('0') << std::setw(2) <<i << ".svg";
        im.write( oss.str() );
    }
}

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