somethings.c

#include "somethings.h"
COLORREF whiteColor = RGB(255, 255, 255);
int countOfDots = 0;
struct sDots *dots;
struct sDots *result;

//HDC hdc = GetDC(FindWindowA("ConsoleWindowClass", NULL));

void menu(){
	printf("\n\nChoose what u want \n");
	printf("Add dot [1] \n");
	printf("Delete dot [2] \n");
	printf("Show dots [3] \n");
	printf("Start algo [4] \n");
	printf("Load dots from file [5] \n");
	int choose = 0;
	scanf("%d", &choose);
	switch (choose){
	case(1) : {
				  addDot();
				  break;
	}
	case(2) : {
				  deleteDot();
				  menu();
				  break;
	}
	case(3) : {
				  showDots();
				  menu();
				  break;

	}
	case(4) : {
				  startAlgo();
				  break;
	}
	case(5) : {
				  loadThis();
				  menu();
				  break;
	}
	default:{
				printf("Bad choose! \n\n");
				menu();
	}
	}
}

void addDot(){
	printf("x  y \n");
	int tmpx = 0, tmpy = 0;
	int target = 1;
	scanf("%d %d", &tmpx, &tmpy);
	for (int i = 0; i < countOfDots; i++){
		if (tmpx == dots[i].x && tmpy == dots[i].y){
			target = 0;
		}
	}
	if (target == 0){
		printf("WRONG DOT!!\n\n");
	}
	else
	{
		dots = (struct sDots *)realloc((void *)dots, (countOfDots = countOfDots + 1)*sizeof(struct sDots));
		dots[countOfDots - 1].x = tmpx;
		dots[countOfDots - 1].y = tmpy;
	}
	menu();
}

void showDots(){
	printf("\n\nDots: \n");
	for (int i = 0; i < countOfDots; i++){
		printf("dot[%d] : %d   %d \n", i + 1, dots[i].x, dots[i].y);
	}
	printf("\n\n");
}

void deleteDot(){
	showDots();
	printf("input number of dot: ");
	int numdot = 0;
	scanf("%d", &numdot);
	numdot -= 1;
	if (numdot < countOfDots){
		for (int i = numdot; i < countOfDots - 1; i++){
			dots[i].x = dots[i + 1].x;
			dots[i].y = dots[i + 1].y;
		}
		dots = (struct sDots *)realloc((void *)dots, (countOfDots = countOfDots - 1)*sizeof(struct sDots));
	}
	else{
		printf("bad input!!!!\n\n");
	}
}

void startAlgo(){
	int counter = 0;
	result = (struct sDots *)realloc((void *)result, (counter)*sizeof(struct sDots));
	//free(result);
	if (countOfDots < 5){
		printf("wron number of dots!\n");
		menu();
	}
	else{
		int size = 0;
		int l = 0;
		for (int i = 1; i < countOfDots; i++){
			if (dots[i].x < dots[l].x)
				l = i;
		}
		int p = l, q = 0;
		do{
			q = (p + 1) % countOfDots;
			for (int i = 0; i < countOfDots; i++)
			if (orientation(dots[p], dots[i], dots[q]) == 2)
				q = i;
			result = (struct sDots *)realloc((void *)result, (size = size + 1)*sizeof(struct sDots));
			result[size - 1].x = dots[q].x;
			result[size - 1].y = dots[q].y;
			p = q;
		} while (p != l);
		for (int i = 0; i < size; i++){
			printf("%d %d \n", result[i].x, result[i].y);
		}
		FILE *output = fopen("output.txt", "w+");
		for (int i = 0; i < size; i++){
			fprintf(output, "%d %d \n", result[i].x, result[i].y);
		}
		fclose(output);
		drawThis(size);
	}
}

int orientation(struct sDots a, struct sDots b, struct sDots c){
	int val = (b.y - a.y) * (c.x - b.x) - (b.x - a.x) * (c.y - b.y);
	if (val == 0)
		return 0;
	return (val > 0) ? 1 : 2;
}

void loadThis(){
	FILE *input = fopen("dots.txt", "r+");
	if (input == NULL){
		printf("Wrong file!\n\n\n\n\n");
		menu();
	}
	else{
		int counter = 0;
		while (!feof(input)){
			if (fgetc(input) == '\n')
				counter++;
		}
		fseek(input, 0, SEEK_SET);
		for (int i = 0; i < counter + 1; i++){
			dots = (struct sDots *)realloc((void *)dots, (countOfDots = countOfDots + 1)*sizeof(struct sDots));
			fscanf(input, "%d %d", &dots[countOfDots - 1].x, &dots[countOfDots - 1].y);
		}
		showDots();
	}
}

void drawThis(int c){
	HDC hdc = GetDC(FindWindowA("ConsoleWindowClass", NULL));
	system("cls");
	for (int i = 0; i < countOfDots; i++){
		drawDot((dots[i].x * 25) + 10, (dots[i].y * 25) + 10);
	}
	for (int i = 0; i < c - 1; i++){
		drawLine((result[i].x * 25) + 10, (result[i].y * 25) + 10, (result[i + 1].x * 25) + 10, (result[i + 1].y * 25) + 10);
	}
	drawLine((result[c - 1].x * 25) + 10, (result[c - 1].y * 25) + 10, (result[0].x * 25) + 10, (result[0].y * 25) + 10);
}

void drawDot(int x, int y){
	HDC hdc = GetDC(FindWindowA("ConsoleWindowClass", NULL));
	SetPixel(hdc, x, y, whiteColor);
}

void drawLine(int x1, int y1, int x2, int y2){
	HDC hdc = GetDC(FindWindowA("ConsoleWindowClass", NULL));
	HPEN pen = CreatePen(PS_SOLID, 1, whiteColor);
	HPEN oldpen = (HPEN)SelectObject(hdc, pen);
	MoveToEx(hdc, x1, y1, 0);
	LineTo(hdc, x2, y2);
	SelectObject(hdc, oldpen);
	DeleteObject(pen);
}