#include <stdio.h>

typedef struct Point {int x,y;} Point;

typedef struct Figure {
	void (*draw) (struct Figure*);
	void (*move) (struct Figure*, int dx, int dy);
} Figure;

typedef struct Circle {
	struct Figure base; // Circle "extends" Figure
	int x,y;
	int rad;
} Circle;

typedef struct Rectangle {
	struct Figure base; // Rectangle "extends" Figure
	int x,y;
	int width, height;
} Rectangle;


typedef struct Triangle {
	struct Figure base; // Triangle "extends" Figure
	Point verts[3];
} Triangle;

/// Figure "Interface" ///////////////////////////////////////////////

void draw_circle(Figure *self){
	Circle *circle = (Circle*) self;
	printf("Circle: center=[%d,%d], radius=%d\n",
	       circle->x, circle->y, circle->rad);
}

void draw_rectangle(Figure *self){
	Rectangle *rect = (Rectangle*) self;
	printf("Rectangle: x=%d, y=%d], width=%d, height=%d\n",
	       rect->x, rect->y, rect->width, rect->height);
}

void draw_triangle(Figure *self){
	Triangle *t = (Triangle*) self;
	printf("Triangle: ");
	for (int i = 0; i < 3; i++){
		printf("v%d=[%d,%d], ", i+1, t->verts[i].x, t->verts[i].y);
	}
	printf("\n");
}

void move_circle(Figure *self, int dx, int dy){
	Circle *circle = (Circle*) self;
	circle->x += dx;
	circle->y += dy;
}

void move_rectangle(Figure *self, int dx, int dy){
	Rectangle *rect = (Rectangle*) self;
	rect->x += dx;
	rect->y += dy;
}

void move_triangle(Figure *self, int dx, int dy){
	Triangle *t = (Triangle*) self;
	for (int i = 0; i < 3; i++){
		t->verts[i].x += dx;
		t->verts[i].y += dy;
	}
}

//////////////////////////////////////////////////////////////////////

void draw_all(Figure **figures){
	while (*figures){
		(*figures)->draw(*figures);
		figures++;
	}
}

void move_all(Figure **figures, int dx, int dy){
	printf("\nMoving all figures by %d in x and %d in y\n\n", 2, 3);
	while (*figures){
		(*figures)->move(*figures, dx, dy);
		figures++;
	}
}

int main(){
	Circle c = {
		.base = (Figure){
			.draw = draw_circle,
			.move = move_circle
		},
		.x = 12,
		.y = 12,
		.rad = 5
	};

	Rectangle rect = {
		.base = (Figure){
			.draw = draw_rectangle,
			.move = move_rectangle
		},
		.x = 34,
		.y = 36,
		.width = 23,
		.height = 90
	};

	Triangle t = {
		.base = (Figure) {
			.draw = draw_triangle,
			.move = move_triangle
		},
		.verts = {
			{12,12},
			{13,13},
			{14,14}
		}
	};

	Figure *arr[] = {(Figure*)&c, (Figure*)&rect, (Figure*)&t, NULL};
	draw_all(arr);
	move_all(arr, 2, 3);
	draw_all(arr);
	return 0;
}