#include <windows.h>
#include <glut.h>
#include <stdio.h>
#include <vector>
#pragma comment (lib, "opengl32.lib")
#pragma comment (lib, "glu32.lib")
#pragma comment(lib,"glut32.lib")

using namespace std;

struct type_color {
   int r;
   int g;
   int b;
};
type_color colors;

struct type_pair {
   double x;
   double y;
};
vector<vector<type_pair>> points;
int area = 1;

void display() {
   glPointSize(10);
   glClearColor(0, 0, 0, 0);
   glColor3ub(colors.r, colors.g, colors.b);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

   for (int j = 0; j < area; j++) {
      glBegin(GL_LINE_LOOP);
      for (int i = 0; i < points[j].size(); i++) {
         glVertex2f(points[j][i].x, points[j][i].y);
      }
      glEnd();

      glBegin(GL_POINTS);
      for (int i = 0; i < points[j].size(); i++)
         glVertex2f(points[j][i].x, points[j][i].y);
      glEnd();
   }
   glutSwapBuffers();
}

void changeSize(int w, int h) {
   glViewport(0, 0, w, h);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glOrtho(0, w, 0, h, -1.0, 1.0);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
}

void mouseButton(int button, int state, int x, int y) {
   if (button == GLUT_LEFT_BUTTON) {
      if (state == GLUT_DOWN) {
         type_pair elem;
         elem.x = (x - 333.0) / 333;
         elem.y = (333.0 - y) / 333;
         points[area - 1].push_back(elem);
      }
   }
   if (button == GLUT_RIGHT_BUTTON) {
      if (state == GLUT_DOWN) {
         area++;
         points.resize(area);
      }
   }
   glutPostRedisplay();
}

void processNormalKeys(unsigned char key, int x, int y) {
   printf("%d %d %d\n", key, x, y);
   switch (key) {
   case '1':
      colors.r = colors.g = colors.g = 255;
      printf("white");
      break;
   case '2':
      colors.r = 255;
      colors.g = colors.g = 0;
      printf("red");
      break;
   }
}

void processSpecialKeys(int key, int x, int y) {
   switch (key) {
   case GLUT_KEY_F1:
      glPointSize(10);
         glBegin(GL_POINTS);
         glVertex2f(0, 0.5);
      glEnd();
   case GLUT_KEY_F2:
      glPointSize(10);
      glBegin(GL_POINTS);
      glVertex2f(0, 0);
      glEnd();
   case GLUT_KEY_F3:
      glPointSize(10);
      glBegin(GL_POINTS);
      glVertex2f(-0.5, 0.5);
      glEnd();
   }
}

int main(int argc, char** argv) {
   glutInit(&argc, argv);
   glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGB);
   glutInitWindowPosition(400, 400);
   glutInitWindowSize(666, 666);
   glutCreateWindow("New");

   points.resize(1);
   colors.r = colors.g = colors.b = 255;

   //glutReshapeFunc(changeSize);
   glutMouseFunc(mouseButton);
   //glutSpecialFunc(processSpecialKeys);
   glutKeyboardFunc(processNormalKeys);

   glutDisplayFunc(display);

   glutMainLoop();

   return 1;
}