showcase22.cpp File Reference

offset polygon More...

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

Include dependency graph for showcase22.cpp:

Functions
int	main (int, const char **)

Detailed Description

offset polygon

Function Documentation

main()

int main	(	int	,
		const char **
	)

{
    auto n = 15; // nb images
    std::vector<Point2d> vpts{
        { -1.0,  1.0 },
        { -1.2, -0.7 },
        {  1.9, -0.5 },
        {  1.6,  1.6 },
        {  0.5,  0.8 }
    };
    CPolyline p0( vpts );

    auto H1 = Homogr().addTranslation(7,6).addScale(15);
    auto H2 = Homogr().addRotation(0.8).addScale(60).addTranslation(280,100);
    auto pol1 = H1 * p0;
    auto pol2 = H2 * p0;

    auto delta = 5.6;
    img::Image<img::SvgImage> im( 500, 250 );

    std::vector<CPolyline> v_poly1, v_poly2;
    v_poly1.push_back( pol1 );
    v_poly2.push_back( pol2 );

    im.draw( pol1, img::DrawParams().setColor(250,0,0) );
    im.draw( pol2, img::DrawParams().setColor(0,0,250) );
    im.write( "showcase22_00.svg" );

    for( int i=1; i<n; i++ )
    {
        im.clear();
        int c = 30;
        for( int j=0; j<(int)v_poly1.size(); j++ ) // draw previous
        {
            im.draw( v_poly1.at(j), img::DrawParams().setColor(c,0,250-c) );
            im.draw( v_poly2.at(j), img::DrawParams().setColor(250-c,c,0 ) );
            c += 10;
        }
        v_poly1.push_back( v_poly1.at(i-1).getOffsetPoly( delta ) );
        v_poly2.push_back( v_poly2.at(i-1).getOffsetPoly( -delta ) );
        im.draw( v_poly1.back(), img::DrawParams().setColor(0,250,0) );
        im.draw( v_poly2.back(), img::DrawParams().setColor(0,0,250) );
#if 0
        auto segs1= v_poly1.back().getSegs();
        auto segs2= v_poly2.back().getSegs();
        for ( const auto& seg: segs2 )
            im.draw( seg.getLine(), img::DrawParams().setColor(200,200,200) );
#endif

        getBB( pol2, v_poly1.back() ).draw( im, img::DrawParams().setColor(150,150,200) );
        std::ostringstream oss;
        oss << "showcase22_" << std::setfill('0') << std::setw(2) << i << ".svg";
        im.write( oss.str() );
    }
}

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