showcase3.cpp File Reference

Generates a rotating polygon with a crossing line, computes the intersection points. More...

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

Include dependency graph for showcase3.cpp:

Functions
int	main (int, const char **)

Detailed Description

Generates a rotating polygon with a crossing line, computes the intersection points.

Function Documentation

main()

int main	(	int	,
		const char **
	)

{
    auto n = 25; // nb images
    CPolyline pl;
    std::vector<Point2d> vpts{
        { 5,5 },
        { 7,3 },
        { 6,  2 },
        { 7.5, 1. },
        { 4, 0 },
        { 5.5, 2.5 },
        { 4., 1.2 },
        { 3., 2.2 },
        { 3.6, 4.1 },
        { 1.6, 5.4 }
    };
    pl.set( vpts );

    auto Hdraw = Homogr().setScale(30).addTranslation(10,30);

    Line2d li(1,1,6,3);
    img::Image<img::SvgImage> img2( 300, 250 );

    Homogr H;
    H.addTranslation(-4,-3).addRotation(360./n/180*M_PI ).addTranslation(4,3);

    for( int i=0; i<n; i++ )
    {
        pl = H*pl;
        img2.clear();
        auto pl2 = Hdraw * pl;
        pl2.draw( img2, img::DrawParams().setColor(250,0,20) );
        pl2.getBB().draw( img2, img::DrawParams().setColor(150,150,120) );
        draw( img2, Hdraw * li,  img::DrawParams().setColor(120,250,220) );
        auto pts = pl.intersects(li);
        auto pts2 = Hdraw * pts.get();
        draw( img2, pts2 );
        std::ostringstream ossa;
        ossa << "showcase3_" << std::setfill('0') << std::setw(2) <<i << ".svg";
        img2.write( ossa.str() );
    }
}

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