showcase20.cpp File Reference

Three circles, one fixed and two whose center rotates. Fixed radius. It shows the line formed by intersections points. The three lines intersect at same point (black). More...

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

Include dependency graph for showcase20.cpp:

Functions
int	main (int, const char **)

Detailed Description

Three circles, one fixed and two whose center rotates. Fixed radius. It shows the line formed by intersections points. The three lines intersect at same point (black).

Function Documentation

main()

int main	(	int	,
		const char **
	)

{
    auto nbim = 25; // nb images

    uint8_t m = 240;

    CPolyline pol( 50, 3 );
    pol.translate( 150, 160 );
    auto pts = pol.getPts();
    auto pt0 = pts[0];
    auto pt1 = pts[1];
    auto pt2 = pts[2];

    auto k1=6;
    auto k2=12;

    auto rad0 = 65;
    auto rad1 = 70;
    auto rad2 = 83;
    for( int i=0; i<nbim; i++ )
    {
        Image<img::SvgImage> im( 320, 320 );

        auto angle = 2. * M_PI * i / nbim;
        auto xr1 = std::cos(angle)*k1;
        auto yr1 = std::sin(angle)*k1;
        auto xr2 = std::cos(angle)*k2;
        auto yr2 = std::sin(angle)*k2;

        Point2d p2( pt2 );
        Point2d p1( pt1 );
        p1.translate( xr1, -yr1 );
        p2.translate( xr2, yr2 );

        Circle cir1( p1, rad1 );
        Circle cir2( p2, rad2 );
        Circle cir0( pt0, rad0 );

        std::array<Circle,3> arr;
        arr[0] = cir0;
        arr[1] = cir1;
        arr[2] = cir2;
        draw( im, getBB( arr ), DrawParams().setColor(220,220,220) );

#if 0
        p1.draw( im, DrawParams().setColor(250,0,0) );
        p2.draw( im, DrawParams().setColor(0,0,250) );
        pt0.draw( im, DrawParams().setColor(0,250,0) );
#endif
        auto int01 = cir0.intersects(cir1).get();
        auto int02 = cir0.intersects(cir2).get();
        auto int12 = cir2.intersects(cir1).get();

        auto li01 = int01[0] * int01[1];
        auto li02 = int02[0] * int02[1];
        auto li12 = int12[0] * int12[1];

        li01.draw( im, DrawParams().setColor(m,m,0) );
        li02.draw( im, DrawParams().setColor(0,m,m) );
        li12.draw( im, DrawParams().setColor(m,0,m) );

        draw( im, getTanSegs( cir0, cir1 ), DrawParams().setColor(m,m,m/3) );
        draw( im, getTanSegs( cir0, cir2 ), DrawParams().setColor(m/3,m,m) );
        draw( im, getTanSegs( cir1, cir2 ), DrawParams().setColor(m,m/3,m) );

        cir0.draw( im, DrawParams().setColor(0,250,0) );
        cir1.draw( im, DrawParams().setColor(250,0,0) );
        cir2.draw( im, DrawParams().setColor(0,0,250) );

        auto centerpt = li01 * li02;
        centerpt.draw( im, DrawParams().setColor(0,0,0).setPointStyle(PtStyle::Dot) );

        std::ostringstream oss;
        oss << "showcase20_" << std::setfill('0') << std::setw(2) << i << ".svg";
        im.write( oss.str() );
    }
}

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