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# Untitled

a guest Apr 18th, 2019 72 Never
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1. int Convex(vector<Point> vector_of_points)
2.
3. {
4.     int i, j, k;
5.     int flag = 0;
6.     double z;
7.
8.     if (vector_of_points.size() < 3)
9.         return(0);
10.
11.     for (i = 0; i < vector_of_points.size(); i++)
12.     {
13.         j = (i + 1) % vector_of_points.size();
14.         k = (i + 2) % vector_of_points.size();
15.         z = (vector_of_points[j].x - vector_of_points[i].x) * (vector_of_points[k].y - vector_of_points[j].y);
16.         z -= (vector_of_points[j].y - vector_of_points[i].y) * (vector_of_points[k].x - vector_of_points[j].x);
17.         if (z < 0)
18.             flag |= 1;
19.         else if (z > 0)
20.             flag |= 2;
21.         if (flag == 3) {
22.             cout << "\n\tConcave(вогнутый)";
23.             return (0);
24.         }
25.     }
26.
27.     if (flag != 0)
28.         cout << "\n\tConvex(выпуклый)";
29.     else
30.         return(0);
31. }
32.
33. void inputPoints(vector<Point> &vector_of_points)
34. {
35.     glClear(GL_COLOR_BUFFER_BIT);
36.     glColor3f(1, 0, 0);
37.     glBegin(GL_LINE_LOOP);
38.     int amount_of_points;
39.     cout << "amount of points: ";
40.     cin >> amount_of_points;
41.     for (int i = 0; i < amount_of_points; i++)
42.     {
43.         Point temp;
44.         cout << "point " << i + 1 << endl;
45.         cout << "\tinput x  ";
46.         cin >> temp.x;
47.         cout << "\tinput y  ";
48.         cin >> temp.y;
49.         glVertex2f(temp.x, temp.y);
50.         vector_of_points.push_back(temp);
51.     }
52.     glEnd();
53.     glFlush();
54.
55. }
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