showcase16.cpp File Reference

a point and a moving line, show side of point relatively to line More...

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

Include dependency graph for showcase16.cpp:

Functions
int	main (int, const char **)

Detailed Description

a point and a moving line, show side of point relatively to line

Function Documentation

main()

int main	(	int	,
		const char **
	)

{
    auto nbim = 25; // nb images
    auto imsize = 300;

    Homogr Hr( 2.*M_PI/nbim );    // set up rotation
    Homogr HT1(  imsize/2,  imsize/2 );  // centered on image center
    Homogr HT2( -imsize/2, -imsize/2 );
    Homogr H = HT1 * Hr * HT2;
//  std::cout << "H=" << H << '\n';

    Point2d pt0( imsize/2, 80 );
    Line2d li( 20,20, 100,100);
    img::Image<img::SvgImage> im( imsize*2,imsize-100 );

    for( int i=0; i<nbim; i++ )
    {
        im.clear();
        pt0.draw( im, img::DrawParams().setColor(0,0,250) );
        li.draw( im, img::DrawParams().setThickness(2).setColor(250,0,0) );
        im.drawText( "side=" + std::to_string( side( pt0, li) ), Point2d(50,50), img::DrawParams() );
        li = H * li;
        std::ostringstream oss;
        oss << "showcase16_" << std::setfill('0') << std::setw(2) << i << ".svg";
        im.write( oss.str() );
    }
}

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