hegyi@1212: // This example was started by Guillaume Laurent.
hegyi@1212: // It has become a place to dump code that tests parts of the
hegyi@1212: // gnomemm canvas code. Little thought has been given to the
hegyi@1212: // actual on-screen output.
hegyi@1212: 
hegyi@1212: #include <libgnomecanvasmm.h>
hegyi@1212: #include <libgnomecanvasmm/polygon.h>
hegyi@1212: #include <iostream>
hegyi@1212: 
hegyi@1212: class CanvasExample : public Gnome::Canvas::CanvasAA
hegyi@1212: {
hegyi@1212: 	typedef Gnome::Canvas::CanvasAA Parent;
hegyi@1212: 
hegyi@1212: public:
hegyi@1221: 	CanvasExample(double *, int);
hegyi@1212: 	virtual ~CanvasExample();
hegyi@1212: 
hegyi@1212: private:
hegyi@1224: 
hegyi@1224: 	///Event handler function that handles dragging nodes of triangle
hegyi@1225: 	bool event_handler(GdkEvent* e, int b);
hegyi@1224: 
hegyi@1224: 	///Event handler function that handles dragging triangle
hegyi@1225: 	bool tri_mover(GdkEvent* e);
hegyi@1224: 
hegyi@1224: 	///Coordinates of Weight Point of tirangle
hegyi@1224: 	Gnome::Art::Point * wp;
hegyi@1224: 	///Array of nodes of planefigure
hegyi@1224: 	Gnome::Canvas::Ellipse ** nodes;
hegyi@1224: 	///Sides of planefigure
hegyi@1224: 	Gnome::Canvas::Polygon * sides;
hegyi@1224: 	///Group of graphical elements of triangle
hegyi@1224: 	Gnome::Canvas::Group triangle;
hegyi@1224: 
hegyi@1224: 	///Indicates whether the button of mouse is pressed or not
hegyi@1224: 	bool isbutton;
hegyi@1224: 
hegyi@1224: 	///Number Of Elements - the number of nodes
hegyi@1221: 	int noe;
hegyi@1221: 
hegyi@1225: 	///Array of coordinates
hegyi@1225: 	double * coordinates;
hegyi@1225: 
hegyi@1224: 	///At this location was the mousebutton pressed.
hegyi@1224: 	///It helps to calculate the distance of dragging.
hegyi@1221: 	double clicked_x, clicked_y;
hegyi@1221: 
hegyi@1224: 	///Remembers which Gnome::Canvas::Item was pressed.
hegyi@1221: 	///this variable is needed, because
hegyi@1221: 	///1. we cannot query the item at he cursor as fast as it could not cause a Segmentation Fault
hegyi@1221: 	///2. we would like to handle only ony item per movement, therefore quering it is not a working solution
hegyi@1221: 	Gnome::Canvas::Item * active_item;
hegyi@1221: 
hegyi@1224: 
hegyi@1212: };
hegyi@1212: 
hegyi@1224: ///When we click on the weight point we can drag the whole triangle. This function resolves it.
hegyi@1225: bool CanvasExample::tri_mover(GdkEvent* e)
hegyi@1212: {
hegyi@1212: 	switch(e->type)
hegyi@1212: 	{
hegyi@1221: 		case GDK_BUTTON_PRESS:
hegyi@1221: 			clicked_x=e->button.x;
hegyi@1221: 			clicked_y=e->button.y;
hegyi@1221: 			isbutton=true;
hegyi@1221: 			break;
hegyi@1221: 		case GDK_BUTTON_RELEASE:
hegyi@1221: 			isbutton=false;
hegyi@1221: 			active_item=NULL;
hegyi@1221: 			break;
hegyi@1221: 		case GDK_MOTION_NOTIFY:
hegyi@1221: 			if(isbutton)
hegyi@1221: 			{
hegyi@1221: 				double dx=e->motion.x-clicked_x;
hegyi@1221: 				double dy=e->motion.y-clicked_y;
hegyi@1225: 
hegyi@1225: 				Gnome::Canvas::Points coos;
hegyi@1225: 
hegyi@1224: 				for(int i=0;i<=noe;i++)
hegyi@1221: 				{
hegyi@1221: 					nodes[i]->move(dx,dy);
hegyi@1225: 
hegyi@1225: 					double x=(coordinates[2*i]+=dx);
hegyi@1225: 					double y=(coordinates[2*i+1]+=dy);
hegyi@1225: 
hegyi@1225: 					if(i!=noe)coos.push_back(Gnome::Art::Point(x,y));
hegyi@1225: 
hegyi@1221: 				}
hegyi@1225: 
hegyi@1221: 				clicked_x=e->motion.x;
hegyi@1221: 				clicked_y=e->motion.y;
hegyi@1221: 
hegyi@1221: 				sides->property_points().set_value(coos);
hegyi@1221: 			}
hegyi@1221: 		default: break;
hegyi@1212: 	}
hegyi@1224: 	return true;
hegyi@1212: }
hegyi@1212: 
hegyi@1224: ///This function moves only one node of triangle,
hegyi@1224: ///but recalculate the location of wight point,
hegyi@1224: ///and also redraw the sides of the planefigure.
hegyi@1225: bool CanvasExample::event_handler(GdkEvent* e, int b)
hegyi@1212: {
hegyi@1221: 	switch(e->type)
hegyi@1221: 	{
hegyi@1221: 		case GDK_BUTTON_PRESS:
hegyi@1221: 			clicked_x=e->button.x;
hegyi@1221: 			clicked_y=e->button.y;
hegyi@1221: 			active_item=(get_item_at(e->button.x, e->button.y));
hegyi@1221: 			isbutton=true;
hegyi@1221: 			break;
hegyi@1221: 		case GDK_BUTTON_RELEASE:
hegyi@1221: 			isbutton=false;
hegyi@1221: 			active_item=NULL;
hegyi@1221: 			break;
hegyi@1221: 		case GDK_MOTION_NOTIFY:
hegyi@1221: 			if(isbutton)
hegyi@1221: 			{
hegyi@1221: 				//double x1, y1, x2, y2;
hegyi@1221: 				//(get_item_at(e->motion.x, e->motion.y))->get_bounds(x1, y1, x2, y2);
hegyi@1221: 				//printf("Item coos: %d %d %d %d\n", (int)x1, (int)y1, (int)x2, (int)y2);
hegyi@1221: 				//printf("Mouse is moved! %d %d\n",(int)e->motion.x,(int)e->motion.y);
hegyi@1221: 				double dx=e->motion.x-clicked_x;
hegyi@1221: 				double dy=e->motion.y-clicked_y;
hegyi@1221: 				active_item->move(dx, dy);
hegyi@1221: 
hegyi@1225: 				coordinates[2*b]+=dx;
hegyi@1225: 				coordinates[2*b+1]+=dy;
hegyi@1225: 
hegyi@1221: 				Gnome::Canvas::Points coos;
hegyi@1221: 
hegyi@1221: 				double x_wp=0;
hegyi@1221: 				double y_wp=0;
hegyi@1221: 
hegyi@1224: 				for(int i=0;i<noe;i++)
hegyi@1221: 				{
hegyi@1225: 					coos.push_back(Gnome::Art::Point(coordinates[2*i], coordinates[2*i+1]));
hegyi@1221: 
hegyi@1225: 					x_wp+=coordinates[2*i];
hegyi@1225: 					y_wp+=coordinates[2*i+1];
hegyi@1221: 				}
hegyi@1221: 
hegyi@1221: 				sides->property_points().set_value(coos);
hegyi@1221: 
hegyi@1224: 				x_wp/=noe;
hegyi@1224: 				y_wp/=noe;
hegyi@1221: 
hegyi@1225: 				dx=x_wp-coordinates[noe*2];
hegyi@1225: 				dy=y_wp-coordinates[noe*2+1];
hegyi@1225: 				nodes[noe]->move(dx, dy);
hegyi@1221: 
hegyi@1225: 				coordinates[noe*2]+=dx;
hegyi@1225: 				coordinates[noe*2+1]+=dy;
hegyi@1221: 
hegyi@1221: 				clicked_x=e->motion.x;
hegyi@1221: 				clicked_y=e->motion.y;
hegyi@1221: 			}
hegyi@1221: 		default: break;
hegyi@1221: 	}
hegyi@1224: 	return true;
hegyi@1221: }
hegyi@1221: 
hegyi@1224: CanvasExample::CanvasExample(double * coosarray, int numofcoos):triangle(*(root()), 0, 0),isbutton(false),active_item(NULL)
hegyi@1221: {
hegyi@1224: 	noe=numofcoos/2;
hegyi@1221: 
hegyi@1225: 	coordinates=new double [numofcoos+2];
hegyi@1225: 
hegyi@1224: 	double x_wp=0;
hegyi@1224: 	double y_wp=0;
hegyi@1221: 
hegyi@1221: 	Gnome::Canvas::Points coos;
hegyi@1224: 	for(int i=0;i<numofcoos;i++)
hegyi@1221: 	{
hegyi@1225: 		coordinates[i]=coosarray[i++];
hegyi@1225: 		coordinates[i]=coosarray[i];
hegyi@1225: 		coos.push_back(Gnome::Art::Point(coordinates[i-1], coordinates[i]));
hegyi@1224: 
hegyi@1225: 		x_wp+=coordinates[i-1];
hegyi@1225: 		y_wp+=coordinates[i];
hegyi@1224: 
hegyi@1221: 	}
hegyi@1212: 
hegyi@1212: 	sides=new Gnome::Canvas::Polygon(triangle, coos);
hegyi@1212: 	*sides << Gnome::Canvas::Properties::outline_color("green");
hegyi@1212: 	sides->property_width_pixels().set_value(10);
hegyi@1212: 
hegyi@1224: 	nodes=new Gnome::Canvas::Ellipse* [noe+1];
hegyi@1212: 
hegyi@1224: 	for(int i=0; i<noe;i++)
hegyi@1212: 	{
hegyi@1212: 		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);
hegyi@1212: 		*(nodes[i]) << Gnome::Canvas::Properties::fill_color("blue");
hegyi@1212: 		*(nodes[i]) << Gnome::Canvas::Properties::outline_color("black");
hegyi@1225: 		(nodes[i])->signal_event().connect(sigc::bind(sigc::mem_fun(*this, &CanvasExample::event_handler),i));
hegyi@1212: 	}
hegyi@1212: 
hegyi@1225: 	coordinates[numofcoos]=x_wp/noe;
hegyi@1225: 	coordinates[numofcoos+1]=y_wp/noe;
hegyi@1212: 
hegyi@1225: 	wp=new Gnome::Art::Point(coordinates[numofcoos],coordinates[numofcoos+1]);
hegyi@1225: 
hegyi@1225: 	nodes[noe]= new Gnome::Canvas::Ellipse
hegyi@1225: 	(
hegyi@1225: 		triangle,
hegyi@1225: 		coordinates[numofcoos]-20,
hegyi@1225: 		coordinates[numofcoos+1]-20,
hegyi@1225: 		coordinates[numofcoos]+20,
hegyi@1225: 		coordinates[numofcoos+1]+20
hegyi@1225: 	);
hegyi@1224: 	*(nodes[noe]) << Gnome::Canvas::Properties::fill_color("blue");
hegyi@1224: 	*(nodes[noe]) << Gnome::Canvas::Properties::outline_color("black");
hegyi@1225: 	(nodes[noe])->signal_event().connect(sigc::mem_fun(*this, &CanvasExample::tri_mover));
hegyi@1225: 
hegyi@1212: 
hegyi@1212: 
hegyi@1212: }
hegyi@1212: 
hegyi@1212: CanvasExample::~CanvasExample()
hegyi@1212: {
hegyi@1212: }
hegyi@1212: 
hegyi@1212: //MainWin:
hegyi@1212: 
hegyi@1212: class MainWin : public Gtk::Window
hegyi@1212: {
hegyi@1212: public:
hegyi@1221: 	MainWin(const std::string& title, double *, int);
hegyi@1212: 
hegyi@1212: protected:
hegyi@1212: 	//Member widgets:
hegyi@1212: 	CanvasExample m_canvas;
hegyi@1212: };
hegyi@1212: 
hegyi@1224: MainWin::MainWin(const std::string& title, double * coosarray, int noc):m_canvas(coosarray, noc)
hegyi@1212: {
hegyi@1212: 	set_title (title);
hegyi@1212: 	add(m_canvas);
hegyi@1212: 	set_default_size(900,600);
hegyi@1212: 
hegyi@1212: 	show_all();
hegyi@1212: }
hegyi@1212: 
hegyi@1212: //main():
hegyi@1212: 
hegyi@1212: int main(int argc, char *argv[])
hegyi@1212: {
hegyi@1221: 	if((argc>=7)&&( (argc/2)!=( (argc+1)/2 ) ) )
hegyi@1221: 	{
hegyi@1221: 		double * coosarray=new double[argc];
hegyi@1212: 
hegyi@1221: 		for(int i=1;i<argc;i++)
hegyi@1221: 		{
hegyi@1221: 			coosarray[i-1]=atof(argv[i]);
hegyi@1221: 		}
hegyi@1221: 
hegyi@1221: 		Gnome::Canvas::init();
hegyi@1221: 		Gtk::Main app(argc, argv);
hegyi@1221: 
hegyi@1221: 		MainWin mainwin("Magic Triangle",coosarray,argc-1);
hegyi@1221: 		app.run(mainwin);
hegyi@1221: 	}
hegyi@1221: 
hegyi@1212: 	return 0;
hegyi@1212: }