#3 improvement of objects-sample.c

[svn/Cll1h/.git] / demos / objects / objects-sample.c

#include "cll1.h"

/* This is example of advanced C<<1 object oriented features... */ 

def_type(Shape);

def_mem(Interface)
{
 void method(draw) (Shape self);
 void method(move) (Shape self, int x, int y);
 str method(desc) (Shape self);
 void method(rename) (Shape self, str name);
 void method(reset) (Shape self, int x1, int y1, int x2, int y2, int x3, int y3);
 float method(area) (Shape self);
 int count;
};

/* We intentionaly define heterogenous objects, which share only the interface 
   binding. Not only we can use different order of variables, and different
   names - but we can even store these data on remote systems, etc.  */

def_mem(Tri)
{
 interface(Interface);
 int x1, y1, x2, y2, x3, y3;
 str name;
};

def_mem(Rect)
{
 interface(Interface);
 str desc;
 int x1, y1, x2, y2;
};

def_mem(Circ)
{
 interface(Interface);
 int x1, y1;
 str comment;
 int r;
};

def_community(Shape, Interface); 

/* Note: interface(Interface); has to be at first position in all objects asociated in community */

def_mem(Object_list)
{
 Shape object;
 list(Object_list);
};


/* implementation of methods */

void drawTri(Shape community)
{
 I_am(Tri);
 
 printf("Drawing %s: %d,%d - %d,%d - %d,%d .\n",
        self->name, self->x1, self->y1, self->x2, self->y2, self->x3, self->y3);
};

void drawRect(Shape community)
{
 I_am(Rect);
 
 printf("Drawing %s: %d,%d - %d,%d .\n",
        self->desc, self->x1, self->y1, self->x2, self->y2);
};

void drawCirc(Shape community)
{
 I_am(Circ);
 
 printf("Drawing %s: %d,%d - r=%d .\n",
        self->comment, self->x1, self->y1, self->r);
};

void moveTri(Shape community, int x, int y)
{
 I_am(Tri);
 
 self->x1 += x;
 self->y1 += y;
 self->x2 += x;
 self->y2 += y;
 self->x3 += x;
 self->y3 += y;
};

void moveRect(Shape community, int x, int y)
{
 I_am(Rect);
 
 self->x1 += x;
 self->y1 += y;
 self->x2 += x;
 self->y2 += y;
};

void moveCirc(Shape community, int x, int y)
{
 I_am(Circ);
 
 self->x1 += x;
 self->y1 += y;
};

str descTri(Shape community)
{
 I_am(Tri);
 
 return self->name;
}

str descRect(Shape community)
{
 I_am(Rect);

 return self->desc;
}

str descCirc(Shape community)
{
 I_am(Circ);
 
 return self->comment;
}

float calcAreaTri(Shape community)
{
 I_am(Tri);

 return 0;
}

float calcAreaRect(Shape community)
{
 I_am(Rect);

 return (self->x2-self->x1)*(self->y2-self->y1);
}

float calcAreaCirc(Shape community)
{
 I_am(Circ);

 return 3.14159*self->r*self->r;
}

void setTri(Shape community, int x1, int y1, int x2, int y2, int x3, int y3)
{
 I_am(Tri);

 self->x1 = x1;
 self->y1 = y1;
 self->x2 = x2;
 self->y2 = y2;
 self->x3 = x3;
 self->y3 = y3;
}

void setRect(Shape community, int x1, int y1, int x2, int y2, int dummy1, int dummy2)
{
 I_am(Rect);
 
 self->x1 = x1;
 self->y1 = y1;
 self->x2 = x2;
 self->y2 = y2;
}

void setCirc(Shape community, int x1, int y1, int r, int dummy1, int dummy2, int dummy3)
{
 I_am(Circ);
 
 self->x1 = x1;
 self->y1 = y1;
 self->r = r;
}

void nameRect(Shape community, str name)
{
 I_am(Rect);
 
 self->desc = name;
}

/* Example of using object interface methods from inside constructor methods */

construct(Tri) (Tri self, int x1, int y1, int x2, int y2, int x3, int y3)
{
 self->name = "TRIANGLE";
 interface_of(self)->count++;
 _(reset, self, x1, y1, x2, y2, x3, y3);

 return self;
}

construct(Rect) (Rect self, int x1, int y1, int x2, int y2)
{
 self->desc = "rectangle";
 interface_of(self)->count++;
 _(reset, self, x1, y1, x2, y2, 0, 0);
 
 return self;
}

construct(Circ) (Circ self, int x1, int y1, int r)
{
 self->comment = "Circle";
 interface_of(self)->count++;
 _(reset, self, x1, y1, r, 0, 0, 0);

 return self;
}

/* registration of implemented methods to three interfaces of the same type */

Interface triInterface(void)
{
 Get_mem(this, Interface);

 this->draw = drawTri;
 this->move = moveTri;
 this->desc = descTri;
 this->rename = NULL;
 this->reset = setTri;
 this->area = calcAreaTri;
 this->count = 0;

 return this;
}

Interface rectInterface(void)
{
 Get_mem(this, Interface);

 this->draw = drawRect;
 this->move = moveRect;
 this->desc = descRect;
 this->rename = nameRect;
 this->reset = setRect;
 this->area = calcAreaRect;
 this->count = 0;

 return this;
}

Interface circInterface(void)
{
 Get_mem(this, Interface);

 this->draw = drawCirc;
 this->move = moveCirc;
 this->desc = descCirc;
 this->rename = NULL;
 this->reset = setCirc;
 this->area = calcAreaCirc;
 this->count = 0;

 return this;
}

/* usage of objects inside C<<1 program */

program
{
 Interface triangles = triInterface();
 Interface rectangles = rectInterface();
 Interface circles = circInterface();
 Object_list all = NULL, one;
 
 one = get_mem(Object_list); 
 one->object = get_obj_as(Shape, Rect, rectangles, 0, 10, 1, 11);
 append(one, all);

 one = get_mem(Object_list); 
 one->object = get_obj_as(Shape, Tri, triangles, 0, 0, 0, 4, 3, 0);
 append(one, all);
 
 one = get_mem(Object_list);  
 one->object = get_obj_as(Shape, Rect, rectangles, 10, 0, 11, 1);
 append(one, all);

 one = get_mem(Object_list);  
 one->object = get_obj_as(Shape, Circ, circles, 0, 10, 1);
 append(one, all);

 printf("We have created %d triangles, %d rectangles and %d circles:\n", 
        triangles->count, rectangles->count, circles->count);

 for_each(one, all)
 {
  _(draw, one->object);
  printf("Area of this %s is %f (square pixels).\n", _(desc, one->object), _(area, one->object));
  printf("We have created %d instances of this type of object.\n", interface_of(one->object)->count);

  if(interface_of(one->object) == rectangles)
  {
   _(reset, one->object, 0, 0, 1, 1, 0, 0);
   _(rename, one->object, "Renamed rectangle");
  }
  else
  {
   _(move, one->object, 10, 10);  
  }
 }

 print("Rectangles were reset to new size and renamed, other objects were moved:");
 for_each(one, all)
 {
  _(draw, one->object);
 } 
}