Changeset 1224:7f4f2855fa11 in lemon-0.x for src/work

Timestamp:

03/17/05 12:45:05 (20 years ago)

Author:

Hegyi Péter

Branch:

default

Phase:

public

Convert:

svn:c9d7d8f5-90d6-0310-b91f-818b3a526b0e/lemon/trunk@1644

Message:

Magic triangle is a bit more DONE, and is already not only a triangle.

Location:

src/work/peter

Files:

• Makefile (modified) (1 diff)
• canvas-test.cc (modified) (13 diffs)

src/work/peter/Makefile

@@ -1 +1 @@
 triangle: canvas-test.cc
-        g++ canvas-test.cc -o triangle `pkg-config libgnomecanvasmm-2.6 --cflags --libs`
+        g++ canvas-test.cc -W -Wall -ansi -pedantic -o triangle `pkg-config libgnomecanvasmm-2.6 --cflags --libs`

src/work/peter/canvas-test.cc

@@ -17 +17 @@
 
 private:
+
+        ///Event handler function that handles dragging nodes of triangle
+        bool event_handler(GdkEvent* e, bool b);
+
+        ///Event handler function that handles dragging triangle
+        bool tri_mover(GdkEvent* e, bool b);
+
+        ///Coordinates of Weight Point of tirangle
+        Gnome::Art::Point * wp;
+        ///Array of nodes of planefigure
+        Gnome::Canvas::Ellipse ** nodes;
+        ///Sides of planefigure
+        Gnome::Canvas::Polygon * sides;
+        ///Group of graphical elements of triangle
+        Gnome::Canvas::Group triangle;
+
+        ///Indicates whether the button of mouse is pressed or not
+        bool isbutton;
+
+        ///Number Of Elements - the number of nodes
         int noe;
 
-        bool isbutton;
+        ///At this location was the mousebutton pressed.
+        ///It helps to calculate the distance of dragging.
         double clicked_x, clicked_y;
 
+        ///Remembers which Gnome::Canvas::Item was pressed.
         ///this variable is needed, because
         ///1. we cannot query the item at he cursor as fast as it could not cause a Segmentation Fault
@@ -27 +49 @@
         Gnome::Canvas::Item * active_item;
 
-        bool event_handler(GdkEvent* e, bool b);
-        bool tri_mover(GdkEvent* e, bool b);
-        Gnome::Art::Point * wp;
-        Gnome::Canvas::Ellipse ** nodes;
-        Gnome::Canvas::Polygon * sides;
-        Gnome::Canvas::Group triangle;
+
 };
 
+///When we click on the weight point we can drag the whole triangle. This function resolves it.
 bool CanvasExample::tri_mover(GdkEvent* e, bool b)
 {
+        b=b;
         switch(e->type)
         {
@@ -51 +70 @@
                         if(isbutton)
                         {
-                                //double x1, y1, x2, y2;
-                                //(get_item_at(e->motion.x, e->motion.y))->get_bounds(x1, y1, x2, y2);
-                                //printf("Item coos: %d %d %d %d\n", (int)x1, (int)y1, (int)x2, (int)y2);
-                                //printf("Mouse is moved! %d %d\n",(int)e->motion.x,(int)e->motion.y);
                                 double dx=e->motion.x-clicked_x;
                                 double dy=e->motion.y-clicked_y;
-                                for(int i=0;i<=noe/2;i++)
+                                for(int i=0;i<=noe;i++)
                                 {
                                         nodes[i]->move(dx,dy);
@@ -65 +80 @@
 
                                 Gnome::Canvas::Points coos;
-                                for(int i=0;i<noe/2;i++)
+                                for(int i=0;i<noe;i++)
                                 {
                                         double x1,y1,x2,y2;
@@ -78 +93 @@
                 default: break;
         }
-}
-
+        return true;
+}
+
+///This function moves only one node of triangle,
+///but recalculate the location of wight point,
+///and also redraw the sides of the planefigure.
 bool CanvasExample::event_handler(GdkEvent* e, bool b)
 {
+        b=b;
         switch(e->type)
         {
@@ -110 +130 @@
                                 double y_wp=0;
 
-                                for(int i=0;i<noe/2;i++)
+                                for(int i=0;i<noe;i++)
                                 {
                                         double x1,y1,x2,y2;
@@ -118 +138 @@
                                         coos.push_back(Gnome::Art::Point(x, y));
 
-                                        if(i<3)
-                                        {
-                                                x_wp+=x;
-                                                y_wp+=y;
-                                        }
+                                        x_wp+=x;
+                                        y_wp+=y;
                                 }
 
                                 sides->property_points().set_value(coos);
 
-                                x_wp/=3;
-                                y_wp/=3;
+                                x_wp/=noe;
+                                y_wp/=noe;
 
                                 double x1,y1,x2,y2;
-                                nodes[noe/2]->get_bounds(x1,y1,x2,y2);
+                                nodes[noe]->get_bounds(x1,y1,x2,y2);
                                 double x=(x1+x2)/2;
                                 double y=(y1+y2)/2;
@@ -137 +154 @@
                                 dx=x_wp-x;
                                 dy=y_wp-y;
-                                nodes[noe/2]->move(dx, dy);
+                                nodes[noe]->move(dx, dy);
 
                                 clicked_x=e->motion.x;
@@ -144 +161 @@
                 default: break;
         }
-}
-
-CanvasExample::CanvasExample(double * coosarray, int numofels):triangle(*(root()), 0, 0),isbutton(false),active_item(NULL)
-{
-        noe=numofels;
-
-        int j=0;
-        double ax=coosarray[j++];
-        double ay=coosarray[j++];
-        double bx=coosarray[j++];
-        double by=coosarray[j++];
-        double cx=coosarray[j++];
-        double cy=coosarray[j++];
+        return true;
+}
+
+CanvasExample::CanvasExample(double * coosarray, int numofcoos):triangle(*(root()), 0, 0),isbutton(false),active_item(NULL)
+{
+        noe=numofcoos/2;
+
+        double x_wp=0;
+        double y_wp=0;
 
         Gnome::Canvas::Points coos;
-        for(int i=0;i<noe;i++)
+        for(int i=0;i<numofcoos;i++)
         {
                 double x=coosarray[i++];
                 double y=coosarray[i];
                 coos.push_back(Gnome::Art::Point(x, y));
+
+                x_wp+=x;
+                y_wp+=y;
+
         }
 
@@ -170 +187 @@
         sides->property_width_pixels().set_value(10);
 
-        nodes=new ( Gnome::Canvas::Ellipse * ) [noe/2+1];
-
-        for(int i=0; i<noe/2;i++)
+        nodes=new Gnome::Canvas::Ellipse* [noe+1];
+
+        for(int i=0; i<noe;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);
@@ -180 +197 @@
         }
 
-        wp=new Gnome::Art::Point((ax+bx+cx)/3,(ay+by+cy)/3);
-
-        nodes[noe/2]= new Gnome::Canvas::Ellipse(triangle, wp->get_x()-20, wp->get_y()-20, wp->get_x()+20, wp->get_y()+20);
-        *(nodes[noe/2]) << Gnome::Canvas::Properties::fill_color("blue");
-        *(nodes[noe/2]) << Gnome::Canvas::Properties::outline_color("black");
-        (nodes[noe/2])->signal_event().connect(sigc::bind(sigc::mem_fun(*this, &CanvasExample::tri_mover),true));
+        wp=new Gnome::Art::Point(x_wp/noe,y_wp/noe);
+
+        nodes[noe]= new Gnome::Canvas::Ellipse(triangle, wp->get_x()-20, wp->get_y()-20, wp->get_x()+20, wp->get_y()+20);
+        *(nodes[noe]) << Gnome::Canvas::Properties::fill_color("blue");
+        *(nodes[noe]) << Gnome::Canvas::Properties::outline_color("black");
+        (nodes[noe])->signal_event().connect(sigc::bind(sigc::mem_fun(*this, &CanvasExample::tri_mover),true));
 
 
@@ -206 +223 @@
 };
 
-MainWin::MainWin(const std::string& title, double * coosarray, int noe):m_canvas(coosarray, noe)
+MainWin::MainWin(const std::string& title, double * coosarray, int noc):m_canvas(coosarray, noc)
 {
         set_title (title);
@@ -235 +252 @@
         }
 
-        printf("Usage:\n./triangle x1 y1 x2 y2 x3 y3\nWhere xi and yi are the coordinates of the points of the triangle\n");
-
         return 0;
 }