All units are complete and warnings removed.

Figure.c

@@ -4,14 +4,23 @@
 void Figure_constructor (Figure *this)
 {
   // nothing here
+
+  // warnings stub
+  this = this;
 }
 
 void Figure_destructor (Figure *this)
 {
   // nothing here
+
+  // warnings stub
+  this = this;
 }
 
-void Figure_copy (struct Figure *dest, const struct Figure *src)
+void Figure_copy (Figure *dest, const Figure *src)
 {
   // nothing here
+
+  // warnings stub
+  dest = (Figure *) src;
 }

Makefile

@@ -1,4 +1,4 @@
-# Makefile generated by command: smake.sh -t main
+# Makefile generated by command: smake.sh -t main --ldflags=-lm
 # This file is generated with smake.sh.
 # You can use this make file with instruction make to
 # use one of build mode: debug, profile, develop, release.
@@ -20,7 +20,7 @@ CC=cc
 CXX=c++
 CFLAGS := $(CFLAGS)
 CXXFLAGS := $(CXXFLAGS)
-LDFLAGS := $(LDFLAGS)
+LDFLAGS := -lm $(LDFLAGS)
 LIBS= 
 SRC=
 INCLUDES= 

Polygon.c

@@ -5,11 +5,12 @@
 #include "Polygon.h"
 
 /* considered to be protected */
-void Polygon_constructor (Polygon *this, const struct point *points, int npoints)
+void Polygon_constructor (Polygon *this, const struct point *points, size_t npoints)
 {
   Figure_constructor ((Figure *) this);
   this->npoints = npoints;
-  this->points = strdup (points, npoints * sizeof (struct point));
+  this->points = malloc (npoints * sizeof (struct point));
+  memcpy (this->points, points, npoints * sizeof (struct point));
 }
 
 void Polygon_destructor (Polygon *this)
@@ -19,8 +20,10 @@ void Polygon_destructor (Polygon *this)
 
 void Polygon_copy (Polygon *dest, const Polygon *src)
 {
+  free (dest->points);
   dest->npoints = src->npoints;
-  dest->points = strdup (src->points, src->npoints * sizeof (struct point));
+  dest->points = malloc (src->npoints * sizeof (struct point));
+  memcpy (dest->points, src->points, src->npoints * sizeof (struct point));
 }
 
 /* private */
@@ -32,7 +35,7 @@ static const char* __Polygon_type ()
 static Polygon* __Polygon_clone (const Polygon *this)
 {
   Polygon *poly = malloc (sizeof (Polygon));
-  memset (poly, 0, sizeof (
+  memset (poly, 0, sizeof (Polygon));
   Polygon_copy (poly, this);
   return poly;
 }
@@ -40,12 +43,12 @@ static Polygon* __Polygon_clone (const Polygon *this)
 static void __Polygon_destroy (Polygon *this)
 {
   Polygon_destructor (this);
-  g_free (this);
+  free (this);
 }
 
-static void __Polygon_draw (const Polygon *this)
+void __Polygon_draw (const Polygon *this)
 {
-  int i = 0;
+  size_t i = 0;
 
   for (i = 0; i < this->npoints; i++)
     {
@@ -54,10 +57,10 @@ static void __Polygon_draw (const Polygon *this)
   printf ("{%f;%f}, ", this->points[0].x, this->points[0].y);
 }
 
-static double __Polygon_area (const Polygon *this)
+double __Polygon_area (const Polygon *this)
 {
-  double s = 0.0, x, y; 
+  double s = 0.0;
-  int i = 0;
+  size_t i = 0;
 
   for (i = 0; i < this->npoints; i++)
     {
@@ -70,13 +73,13 @@ static double __Polygon_area (const Polygon *this)
   // S=abs(сумма{(x[i+1]-x[i])*(y[i+1]+y[i])/2})
 }
 
-static double __Polygon_max_diag (const Polygon *this)
+double __Polygon_max_diag (const Polygon *this)
 {
   double diag = 0.0,
          tmp = 0.0,
          tmp1 = 0.0,
          tmp2 = 0.0;
-  int i = 0, j = 0;
+  size_t i = 0, j = 0;
 
   for (i = 0; i < this->npoints - 2; i++)
     {
@@ -96,9 +99,20 @@ static double __Polygon_max_diag (const Polygon *this)
 }
 
 /* public */
-Polygon* Polygon_new (const struct point *points, int npoints)
+Polygon* Polygon_new (const struct point *points, size_t npoints)
 {
-  Polygon *poly = g_new0 (Polygon, 1);
+  static struct Polygon_vtable vtable = {
+    __Polygon_type,
+    __Polygon_clone,
+    __Polygon_destroy,
+    __Polygon_draw,
+    __Polygon_area,
+    __Polygon_max_diag
+  };
+
+  Polygon *poly = malloc (sizeof (Polygon));
+  memset (poly, 0, sizeof (Polygon));
   Polygon_constructor (poly, points, npoints);
+  poly->vtable = &vtable;
   return poly;
 }

Polygon.h

@@ -1,6 +1,8 @@
 #ifndef __POLYGON_H__
 #define __POLYGON_H__
 
+#include <stdlib.h>
+
 #include "Figure.h"
 
 typedef struct Polygon
@@ -22,7 +24,7 @@ typedef struct Polygon
   } *vtable;
 
   /* Polygon fields */
-  int npoints;
+  size_t npoints;
 
   struct point
   {
@@ -32,7 +34,7 @@ typedef struct Polygon
 
 } Polygon;
 
-Polygon* Polygon_new (const struct point *points, int npoints);
+Polygon* Polygon_new (const struct point *points, size_t npoints);
 
 static inline const char* Polygon_type (const Polygon *this)
 {
@@ -65,8 +67,11 @@ static inline double Polygon_max_diag (const Polygon *this)
 }
 
 /* considered to be protected */
-void Polygon_constructor (Polygon *this, const struct point *points, int npoints);
+void Polygon_constructor (Polygon *this, const struct point *points, size_t npoints);
 void Polygon_destructor (Polygon *this);
 void Polygon_copy (Polygon *dest, const Polygon *src);
+void __Polygon_draw (const Polygon *this);
+double __Polygon_area (const Polygon *this);
+double __Polygon_max_diag (const Polygon *this);
 
 #endif // __POLYGON_H__

Rhomb.c

@@ -1,5 +1,25 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
 #include "Rhomb.h"
 
+/* considered to be protected */
+void Rhomb_constructor (Rhomb *this, const struct point *points)
+{
+  Polygon_constructor ((Polygon *) this, points, 4);
+}
+
+void Rhomb_destructor (Rhomb *this)
+{
+  Polygon_destructor ((Polygon *) this);
+}
+
+void Rhomb_copy (Rhomb *dest, const Rhomb *src)
+{
+  Polygon_copy ((Polygon *) dest, (Polygon *) src);
+}
+
 /* private */
 static const char* __Rhomb_type ()
 {
@@ -8,52 +28,64 @@ static const char* __Rhomb_type ()
 
 static Rhomb* __Rhomb_clone (const Rhomb *this)
 {
-
+  Rhomb *rhomb = malloc (sizeof (Rhomb));
+  memset (rhomb, 0, sizeof (Rhomb));
+  Rhomb_copy (rhomb, this);
+  return rhomb;
 }
 
 static void __Rhomb_destroy (Rhomb *this)
 {
-
+  Rhomb_destructor (this);
+  free (this);
 }
 
 static void __Rhomb_draw (const Rhomb *this)
 {
-
+  __Polygon_draw ((Polygon *) this);
 }
 
 static double __Rhomb_area (const Rhomb *this)
 {
-
+  return __Polygon_area ((Polygon *) this);
 }
 
 static double __Rhomb_max_diag (const Rhomb *this)
 {
-
+  return __Polygon_max_diag ((Polygon *) this);
 }
 
 static int __Rhomb_is_square (const Rhomb *this)
 {
+  double diag1, diag2, tmp1, tmp2;
+  
+  tmp1 = this->points[0].x - this->points[2].x;
+  tmp2 = this->points[0].y - this->points[2].y;
+  diag1 = tmp1 * tmp1 + tmp2 * tmp2;
 
+  tmp1 = this->points[1].x - this->points[3].x;
+  tmp2 = this->points[1].y - this->points[3].y;
+  diag2 = tmp1 * tmp1 + tmp2 * tmp2;
+
+  return (diag1 == diag2);
 }
 
 /* public */
-Rhomb* Rhomb_new (const struct point *points, int npoints)
+Rhomb* Rhomb_new (const struct point *points)
-{
-
-}
-
-/* considered to be protected */
-void Rhomb_constructor (Rhomb *this, const struct point *points, int npoints)
-{
-
-}
-
-void Rhomb_destructor (Rhomb *this)
-{
-
-}
-
-void Rhomb_copy (Rhomb *dest, const Rhomb *src)
 {
+  static struct Rhomb_vtable vtable = {
+    __Rhomb_type,
+    __Rhomb_clone,
+    __Rhomb_destroy,
+    __Rhomb_draw,
+    __Rhomb_area,
+    __Rhomb_max_diag,
+    __Rhomb_is_square
+  };
 
+  Rhomb *rhomb = malloc (sizeof (Rhomb));
+  memset (rhomb, 0, sizeof (Rhomb));
+  Rhomb_constructor (rhomb, points);
+  rhomb->vtable = &vtable;
+  return rhomb;
 }

Rhomb.h

@@ -25,13 +25,13 @@ typedef struct Rhomb
   } *vtable;
 
   /* derived from Polygon */
-  int npoints;
+  size_t npoints;
 
   struct point *points;
 
 } Rhomb;
 
-Rhomb* Rhomb_new (const struct point *points, int npoints);
+Rhomb* Rhomb_new (const struct point *points);
 
 static inline const char* Rhomb_type (const Rhomb *this)
 {
@@ -69,7 +69,7 @@ static inline int Rhomb_is_square (const Rhomb *this)
 }
 
 /* considered to be protected */
-void Rhomb_constructor (Rhomb *this, const struct point *points, int npoints);
+void Rhomb_constructor (Rhomb *this, const struct point *points);
 void Rhomb_destructor (Rhomb *this);
 void Rhomb_copy (Rhomb *dest, const Rhomb *src);