source: lemon-0.x/src/work/peter/canvas-test.cc @ 1217:640ca1bd850f

// This example was started by Guillaume Laurent.
// It has become a place to dump code that tests parts of the
// gnomemm canvas code. Little thought has been given to the
// actual on-screen output.

#include <libgnomecanvasmm.h>
#include <libgnomecanvasmm/polygon.h>
#include <iostream>

class CanvasExample : public Gnome::Canvas::CanvasAA
{
        typedef Gnome::Canvas::CanvasAA Parent;

public:
        CanvasExample();
        virtual ~CanvasExample();

private:
        bool event_handler(GdkEvent* e, bool b);
        Gnome::Canvas::Points coos;
        Gnome::Art::Point * wp;
        Gnome::Canvas::Ellipse ** nodes;
        Gnome::Canvas::Polygon * sides;
        Gnome::Canvas::Group triangle;
};

bool CanvasExample::event_handler(GdkEvent* e, bool b)
{
        bool isbutton=true;
        switch(e->type)
        {
                case GDK_BUTTON_PRESS: printf("Node is pressed!\n"); break;
                //case GDK_BUTTON_RELEASE: printf("Node is released!\n"); break;
                default: isbutton=false; break;
        }
        if(isbutton)
        {
                //(get_item_at(e->button.x, e->button.y))->move(5,5);
                (get_item_at(e->button.x, e->button.y))->hide();
        }
}

CanvasExample::CanvasExample():triangle(*(root()), 0, 0)
{
        double ax=100;
        double ay=100;
        double bx=-100;
        double by=100;
        double cx=0;
        double cy=-100;
        coos.push_back(Gnome::Art::Point(100, 100));
        coos.push_back(Gnome::Art::Point(-100, 100));
        coos.push_back(Gnome::Art::Point(0, -100));

        sides=new Gnome::Canvas::Polygon(triangle, coos);
        *sides << Gnome::Canvas::Properties::outline_color("green");
        sides->property_width_pixels().set_value(10);

        nodes=new ( Gnome::Canvas::Ellipse * ) [4];

        for(int i=0; i<3;i++)
        {
                nodes[i]= new Gnome::Canvas::Ellipse(triangle, coos[i].get_x()-20, coos[i].get_y()-20, coos[i].get_x()+20, coos[i].get_y()+20);
                *(nodes[i]) << Gnome::Canvas::Properties::fill_color("blue");
                *(nodes[i]) << Gnome::Canvas::Properties::outline_color("black");
                (nodes[i])->signal_event().connect(sigc::bind(sigc::mem_fun(*this, &CanvasExample::event_handler),true));
        }

        wp=new Gnome::Art::Point((ax+bx+cx)/3,(ay+by+cy)/3);

        nodes[3]= new Gnome::Canvas::Ellipse(triangle, wp->get_x()-20, wp->get_y()-20, wp->get_x()+20, wp->get_y()+20);
        *(nodes[3]) << Gnome::Canvas::Properties::fill_color("blue");
        *(nodes[3]) << Gnome::Canvas::Properties::outline_color("black");


}

CanvasExample::~CanvasExample()
{
}

//MainWin:

class MainWin : public Gtk::Window
{
public:
        MainWin(const std::string& title);

protected:
        //Member widgets:
        CanvasExample m_canvas;
};

MainWin::MainWin(const std::string& title)
{
        set_title (title);
        add(m_canvas);
        set_default_size(900,600);

        show_all();
}

//main():

int main(int argc, char *argv[])
{
        Gnome::Canvas::init();
        Gtk::Main app(argc, argv);

        MainWin mainwin("Gnome::Canvas Example");
        app.run(mainwin);

        return 0;
}