1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/work/peter/magic_plane_figure.cc Fri Apr 01 09:43:52 2005 +0000
1.3 @@ -0,0 +1,269 @@
1.4 +// This example was started by Guillaume Laurent.
1.5 +// It has become a place to dump code that tests parts of the
1.6 +// gnomemm canvas code. Little thought has been given to the
1.7 +// actual on-screen output.
1.8 +
1.9 +#include <libgnomecanvasmm.h>
1.10 +#include <libgnomecanvasmm/polygon.h>
1.11 +#include <iostream>
1.12 +#include <lemon/list_graph.h>
1.13 +
1.14 +class CanvasExample : public Gnome::Canvas::CanvasAA
1.15 +{
1.16 + typedef Gnome::Canvas::CanvasAA Parent;
1.17 +
1.18 +public:
1.19 + CanvasExample(double *, int);
1.20 + virtual ~CanvasExample();
1.21 +
1.22 +private:
1.23 +
1.24 + ///Event handler function that handles dragging nodes of triangle
1.25 + bool event_handler(GdkEvent* e, int b);
1.26 +
1.27 + ///Event handler function that handles dragging triangle
1.28 + bool tri_mover(GdkEvent* e);
1.29 +
1.30 + ///Coordinates of Weight Point of tirangle
1.31 + Gnome::Art::Point * wp;
1.32 + ///Array of nodes of planefigure
1.33 + Gnome::Canvas::Ellipse ** nodes;
1.34 + ///Sides of planefigure
1.35 + Gnome::Canvas::Polygon * sides;
1.36 + ///Group of graphical elements of triangle
1.37 + Gnome::Canvas::Group triangle;
1.38 +
1.39 + ///Indicates whether the button of mouse is pressed or not
1.40 + bool isbutton;
1.41 +
1.42 + ///Number Of Elements - the number of nodes
1.43 + int noe;
1.44 +
1.45 + ///Array of coordinates
1.46 + double * coordinates;
1.47 +
1.48 + ///At this location was the mousebutton pressed.
1.49 + ///It helps to calculate the distance of dragging.
1.50 + double clicked_x, clicked_y;
1.51 +
1.52 + ///Remembers which Gnome::Canvas::Item was pressed.
1.53 + ///this variable is needed, because
1.54 + ///1. we cannot query the item at he cursor as fast as it could not cause a Segmentation Fault
1.55 + ///2. we would like to handle only ony item per movement, therefore quering it is not a working solution
1.56 + Gnome::Canvas::Item * active_item;
1.57 +
1.58 +
1.59 +};
1.60 +
1.61 +///When we click on the weight point we can drag the whole triangle. This function resolves it.
1.62 +bool CanvasExample::tri_mover(GdkEvent* e)
1.63 +{
1.64 + switch(e->type)
1.65 + {
1.66 + case GDK_BUTTON_PRESS:
1.67 + clicked_x=e->button.x;
1.68 + clicked_y=e->button.y;
1.69 + isbutton=true;
1.70 + break;
1.71 + case GDK_BUTTON_RELEASE:
1.72 + isbutton=false;
1.73 + active_item=NULL;
1.74 + break;
1.75 + case GDK_MOTION_NOTIFY:
1.76 + if(isbutton)
1.77 + {
1.78 + double dx=e->motion.x-clicked_x;
1.79 + double dy=e->motion.y-clicked_y;
1.80 +
1.81 + Gnome::Canvas::Points coos;
1.82 +
1.83 + for(int i=0;i<=noe;i++)
1.84 + {
1.85 + nodes[i]->move(dx,dy);
1.86 +
1.87 + double x=(coordinates[2*i]+=dx);
1.88 + double y=(coordinates[2*i+1]+=dy);
1.89 +
1.90 + if(i!=noe)coos.push_back(Gnome::Art::Point(x,y));
1.91 +
1.92 + }
1.93 +
1.94 + clicked_x=e->motion.x;
1.95 + clicked_y=e->motion.y;
1.96 +
1.97 + sides->property_points().set_value(coos);
1.98 + }
1.99 + default: break;
1.100 + }
1.101 + return true;
1.102 +}
1.103 +
1.104 +///This function moves only one node of triangle,
1.105 +///but recalculate the location of wight point,
1.106 +///and also redraw the sides of the planefigure.
1.107 +bool CanvasExample::event_handler(GdkEvent* e, int b)
1.108 +{
1.109 + switch(e->type)
1.110 + {
1.111 + case GDK_BUTTON_PRESS:
1.112 + clicked_x=e->button.x;
1.113 + clicked_y=e->button.y;
1.114 + active_item=(get_item_at(e->button.x, e->button.y));
1.115 + isbutton=true;
1.116 + break;
1.117 + case GDK_BUTTON_RELEASE:
1.118 + isbutton=false;
1.119 + active_item=NULL;
1.120 + break;
1.121 + case GDK_MOTION_NOTIFY:
1.122 + if(isbutton)
1.123 + {
1.124 + //double x1, y1, x2, y2;
1.125 + //(get_item_at(e->motion.x, e->motion.y))->get_bounds(x1, y1, x2, y2);
1.126 + //printf("Item coos: %d %d %d %d\n", (int)x1, (int)y1, (int)x2, (int)y2);
1.127 + //printf("Mouse is moved! %d %d\n",(int)e->motion.x,(int)e->motion.y);
1.128 + double dx=e->motion.x-clicked_x;
1.129 + double dy=e->motion.y-clicked_y;
1.130 + active_item->move(dx, dy);
1.131 +
1.132 + coordinates[2*b]+=dx;
1.133 + coordinates[2*b+1]+=dy;
1.134 +
1.135 + Gnome::Canvas::Points coos;
1.136 +
1.137 + double x_wp=0;
1.138 + double y_wp=0;
1.139 +
1.140 + for(int i=0;i<noe;i++)
1.141 + {
1.142 + coos.push_back(Gnome::Art::Point(coordinates[2*i], coordinates[2*i+1]));
1.143 +
1.144 + x_wp+=coordinates[2*i];
1.145 + y_wp+=coordinates[2*i+1];
1.146 + }
1.147 +
1.148 + sides->property_points().set_value(coos);
1.149 +
1.150 + x_wp/=noe;
1.151 + y_wp/=noe;
1.152 +
1.153 + dx=x_wp-coordinates[noe*2];
1.154 + dy=y_wp-coordinates[noe*2+1];
1.155 + nodes[noe]->move(dx, dy);
1.156 +
1.157 + coordinates[noe*2]+=dx;
1.158 + coordinates[noe*2+1]+=dy;
1.159 +
1.160 + clicked_x=e->motion.x;
1.161 + clicked_y=e->motion.y;
1.162 + }
1.163 + default: break;
1.164 + }
1.165 + return true;
1.166 +}
1.167 +
1.168 +CanvasExample::CanvasExample(double * coosarray, int numofcoos):triangle(*(root()), 0, 0),isbutton(false),active_item(NULL)
1.169 +{
1.170 + noe=numofcoos/2;
1.171 +
1.172 + coordinates=new double [numofcoos+2];
1.173 +
1.174 + double x_wp=0;
1.175 + double y_wp=0;
1.176 +
1.177 + Gnome::Canvas::Points coos;
1.178 + for(int i=0;i<numofcoos;i+=2)
1.179 + {
1.180 + coordinates[i]=coosarray[i];
1.181 + coordinates[i+1]=coosarray[i+1];
1.182 + coos.push_back(Gnome::Art::Point(coordinates[i],
1.183 + coordinates[i+1]));
1.184 +
1.185 + x_wp+=coordinates[i];
1.186 + y_wp+=coordinates[i+1];
1.187 +
1.188 + }
1.189 +
1.190 + sides=new Gnome::Canvas::Polygon(triangle, coos);
1.191 + *sides << Gnome::Canvas::Properties::outline_color("green");
1.192 + sides->property_width_pixels().set_value(10);
1.193 +
1.194 + nodes=new Gnome::Canvas::Ellipse* [noe+1];
1.195 +
1.196 + for(int i=0; i<noe;i++)
1.197 + {
1.198 + 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);
1.199 + *(nodes[i]) << Gnome::Canvas::Properties::fill_color("blue");
1.200 + *(nodes[i]) << Gnome::Canvas::Properties::outline_color("black");
1.201 + (nodes[i])->signal_event().connect(sigc::bind(sigc::mem_fun(*this, &CanvasExample::event_handler),i));
1.202 + }
1.203 +
1.204 + coordinates[numofcoos]=x_wp/noe;
1.205 + coordinates[numofcoos+1]=y_wp/noe;
1.206 +
1.207 + wp=new Gnome::Art::Point(coordinates[numofcoos],coordinates[numofcoos+1]);
1.208 +
1.209 + nodes[noe]= new Gnome::Canvas::Ellipse
1.210 + (
1.211 + triangle,
1.212 + coordinates[numofcoos]-20,
1.213 + coordinates[numofcoos+1]-20,
1.214 + coordinates[numofcoos]+20,
1.215 + coordinates[numofcoos+1]+20
1.216 + );
1.217 + *(nodes[noe]) << Gnome::Canvas::Properties::fill_color("blue");
1.218 + *(nodes[noe]) << Gnome::Canvas::Properties::outline_color("black");
1.219 + (nodes[noe])->signal_event().connect(sigc::mem_fun(*this, &CanvasExample::tri_mover));
1.220 +
1.221 +
1.222 +
1.223 +}
1.224 +
1.225 +CanvasExample::~CanvasExample()
1.226 +{
1.227 +}
1.228 +
1.229 +//MainWin:
1.230 +
1.231 +class MainWin : public Gtk::Window
1.232 +{
1.233 +public:
1.234 + MainWin(const std::string& title, double *, int);
1.235 +
1.236 +protected:
1.237 + //Member widgets:
1.238 + CanvasExample m_canvas;
1.239 +};
1.240 +
1.241 +MainWin::MainWin(const std::string& title, double * coosarray, int noc):m_canvas(coosarray, noc)
1.242 +{
1.243 + set_title (title);
1.244 + add(m_canvas);
1.245 + set_default_size(900,600);
1.246 +
1.247 + show_all();
1.248 +}
1.249 +
1.250 +//main():
1.251 +
1.252 +int main(int argc, char *argv[])
1.253 +{
1.254 + if((argc>=7)&& (argc%2) )
1.255 + {
1.256 + double * coosarray=new double[argc];
1.257 +
1.258 + for(int i=1;i<argc;i++)
1.259 + {
1.260 + coosarray[i-1]=atof(argv[i]);
1.261 + printf("%g%c",coosarray[i-1],i%2?' ':'\n');
1.262 + }
1.263 +
1.264 + Gnome::Canvas::init();
1.265 + Gtk::Main app(argc, argv);
1.266 +
1.267 + MainWin mainwin("Magic Triangle",coosarray,argc-1);
1.268 + app.run(mainwin);
1.269 + }
1.270 +
1.271 + return 0;
1.272 +}