Example #1
0
 bool intersect(pt a, pt b, pt c, pt d)
 {
     return(intersect_1(a.x, b.x, c.x, d.x) &&
            intersect_1(a.y, b.y, c.y, d.y) &&
            area(a, b, c) * area(a, b, d) < 0 &&
            area(c, d, a) * area(c, d, b) < 0);
 }
Example #2
0
 bool intersect(pt a, pt b, pt c, pt d)
 {
     return intersect_1(a.x, b.x, c.x, d.x)
         && intersect_1(a.y, b.y, c.y, d.y)
         && area(a, b, c) * area(a, b, d) < 0
         && area(c, d, a) * area(c, d, b) < 0;
 }
Example #3
0
 int area(pt a, pt b, pt c)
 {
     return (b.x - a.x) * (c.y - a.y) - (b.y - a.y) * (c.x - a.x);
 }
Example #4
0
 private void триангуляцияДелонеToolStripMenuItem_Click(object sender, EventArgs e)
 {
     Tans = new int[maxn][];
     for (int i = 0; i < maxn; ++i)
         Tans[i] = new int[3];
     TMans = 0;
     nn = n; ///////////////
     int[][] D = new int[maxn * maxn][];
     for (int i = 0; i < maxn * maxn; ++i)
         D[i] = new int[3];
     int cntD = 0;
     for (int i = 0; i < nn; ++i)
     {
         for (int j = i + 1; j < nn; ++j)
         {
             for (int k = j + 1; k < nn; ++k)
             {
                 int xi = points_arr[i].X;
                 int xj = points_arr[j].X;
                 int yi = points_arr[i].Y;
                 int yj = points_arr[j].Y;
                 int xk = points_arr[k].X;
                 int yk = points_arr[k].Y;
                 int UA = yi - yj;///y[i] - y[j];
                 int UB = xj - xi;/////x[j] - x[i];
                 int UC =-(UA* xi + UB * yi);//// -(UA * x[i] + UB * y[i]);
                 if (UA * xk + UB * yk + UC == 0)////(UA * x[k] + UB * y[k] + UC == 0)
                     continue;
                 double A = Math.Sqrt((x[i] - x[j]) * (x[i] - x[j]) + (y[i] - y[j]) * (y[i] - y[j]));
                 double B = Math.Sqrt((x[i] - x[k]) * (x[i] - x[k]) + (y[i] - y[k]) * (y[i] - y[k]));
                 double C = Math.Sqrt((x[k] - x[j]) * (x[k] - x[j]) + (y[k] - y[j]) * (y[k] - y[j]));
                 double p = (A + B + C) / 2.0;
                 double S = Math.Sqrt(p * (p - A) * (p - B) * (p - C));
                 double[] RAB = new double[2];
                 RAB[0] = x[i] - x[j];
                 RAB[1] = y[i] - y[j];
                 double[] RAC = new double[2];
                 RAC[0] = x[i] - x[k];
                 RAC[1] = y[i] - y[k];
                 double[] RCB = new double[2];
                 RCB[0] = x[k] - x[j];
                 RCB[1] = y[k] - y[j];
                 double AA = (C * C * (RAB[0] * RAC[0] + RAB[1] * RAC[1])) / (8.0 * S * S);
                 double AB = (B * B * (RAB[0] * RCB[0] + RAB[1] * RCB[1])) / (8.0 * S * S);
                 double AC = (A * A * (-RAC[0] * RCB[0] - RAC[1] * RCB[1])) / (8.0 * S * S);
                 double X = AA * x[i] + AB * x[j] + AC * x[k];
                 double Y = AA * y[i] + AB * y[j] + AC * y[k];
                 double R2 = (x[i] - X) * (x[i] - X) + (y[i] - Y) * (y[i] - Y);
                 bool fnd = true;
                 for (int t = 0; t < nn && fnd; ++t)
                 {
                     if (R2 > (x[t] - X) * (x[t] - X) + (y[t] - Y) * (y[t] - Y) + eps)
                     {
                         fnd = false;
                     }
                 }
                 if (fnd)
                 {
                     for (int t = 0; t < cntD; ++t)
                     {
                         if (D[t][0] == i && D[t][1] == j && D[t][2] == k)
                         {
                             fnd = false;
                             break;
                         }
                     }
                 }
                 if (fnd)
                 {
                     for (int t = 0; t < nn; ++t)
                     {
                         if (Math.Abs(R2 - (x[t] - X) * (x[t] - X) - (y[t] - Y) * (y[t] - Y)) < eps && t != i && t != j && t != k)
                         {
                             //нужно проверить на пересечения треугольники
                             pt Pt1 = new pt(x[i], y[i]);
                             pt Pt2 = new pt(x[j], y[j]);
                             pt Pt3 = new pt(x[k], y[k]);
                             pt Pt4 = new pt(x[t], y[t]);
                             if (intersect(Pt1, Pt2, Pt3, Pt4))
                             {
                                 D[cntD][0] = i;
                                 D[cntD][1] = k;
                                 D[cntD][2] = t;
                                 //D[cntD][3] = t;
                                 for (int w = 0; w < 3; ++w)
                                     for (int u = w + 1; u < 3; ++u)
                                         if (D[cntD][w] > D[cntD][u])
                                         {
                                             int tmp = D[cntD][w];
                                             D[cntD][w] = D[cntD][u];
                                             D[cntD][u] = tmp;
                                         }
                                 ++cntD;
                                 D[cntD][0] = k;
                                 D[cntD][1] = j;
                                 D[cntD][2] = t;
                                 //D[cntD][3] = t;
                                 for (int w = 0; w < 3; ++w)
                                     for (int u = w + 1; u < 3; ++u)
                                         if (D[cntD][w] > D[cntD][u])
                                         {
                                             int tmp = D[cntD][w];
                                             D[cntD][w] = D[cntD][u];
                                             D[cntD][u] = tmp;
                                         }
                                 ++cntD;
                             }
                             Pt1 = new pt(x[i], y[i]);
                             Pt2 = new pt(x[k], y[k]);
                             Pt3 = new pt(x[j], y[j]);
                             Pt4 = new pt(x[t], y[t]);
                             if (intersect(Pt1, Pt2, Pt3, Pt4))
                             {
                                 D[cntD][0] = j;
                                 D[cntD][1] = k;
                                 D[cntD][2] = t;
                                 //D[cntD][3] = t;
                                 for (int w = 0; w < 3; ++w)
                                     for (int u = w + 1; u < 3; ++u)
                                         if (D[cntD][w] > D[cntD][u])
                                         {
                                             int tmp = D[cntD][w];
                                             D[cntD][w] = D[cntD][u];
                                             D[cntD][u] = tmp;
                                         }
                                 ++cntD;
                                 D[cntD][0] = i;
                                 D[cntD][1] = j;
                                 D[cntD][2] = t;
                                 //D[cntD][3] = t;
                                 for (int w = 0; w < 3; ++w)
                                     for (int u = w + 1; u < 3; ++u)
                                         if (D[cntD][w] > D[cntD][u])
                                         {
                                             int tmp = D[cntD][w];
                                             D[cntD][w] = D[cntD][u];
                                             D[cntD][u] = tmp;
                                         }
                                 ++cntD;
                             }
                             Pt1 = new pt(x[j], y[j]);
                             Pt2 = new pt(x[k], y[k]);
                             Pt3 = new pt(x[i], y[i]);
                             Pt4 = new pt(x[t], y[t]);
                             if (intersect(Pt1, Pt2, Pt3, Pt4))
                             {
                                 D[cntD][0] = i;
                                 D[cntD][1] = k;
                                 D[cntD][2] = t;
                                 for (int w = 0; w < 3; ++w)
                                     for (int u = w + 1; u < 3; ++u)
                                         if (D[cntD][w] > D[cntD][u])
                                         {
                                             int tmp = D[cntD][w];
                                             D[cntD][w] = D[cntD][u];
                                             D[cntD][u] = tmp;
                                         }
                                 ++cntD;
                                 D[cntD][0] = j;
                                 D[cntD][1] = i;
                                 D[cntD][2] = t;
                                 //D[cntD][3] = t;
                                 for (int w = 0; w < 3; ++w)
                                     for (int u = w + 1; u < 3; ++u)
                                         if (D[cntD][w] > D[cntD][u])
                                         {
                                             int tmp = D[cntD][w];
                                             D[cntD][w] = D[cntD][u];
                                             D[cntD][u] = tmp;
                                         }
                                 ++cntD;
                             }
                         }
                     }
                     Tans[TMans][0] = i;
                     Tans[TMans][1] = j;
                     Tans[TMans][2] = k;
                     ++TMans;
                 }
             }
         }
         drawTriangle();
     }
 }
Example #5
0
        private void триангуляцияДелонеToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Tans = new int[maxn][];
            for (int i = 0; i < maxn; ++i)
            {
                Tans[i] = new int[3];
            }
            TMans = 0;
            nn    = n;          ///////////////
            int[][] D = new int[maxn * maxn][];
            for (int i = 0; i < maxn * maxn; ++i)
            {
                D[i] = new int[3];
            }
            int cntD = 0;

            for (int i = 0; i < nn; ++i)
            {
                for (int j = i + 1; j < nn; ++j)
                {
                    for (int k = j + 1; k < nn; ++k)
                    {
                        int xi = points_arr[i].X;
                        int xj = points_arr[j].X;
                        int yi = points_arr[i].Y;
                        int yj = points_arr[j].Y;
                        int xk = points_arr[k].X;
                        int yk = points_arr[k].Y;
                        int UA = yi - yj;                        ///y[i] - y[j];
                        int UB = xj - xi;                        /////x[j] - x[i];
                        int UC = -(UA * xi + UB * yi);           //// -(UA * x[i] + UB * y[i]);
                        if (UA * xk + UB * yk + UC == 0)         ////(UA * x[k] + UB * y[k] + UC == 0)
                        {
                            continue;
                        }
                        double   A   = Math.Sqrt((x[i] - x[j]) * (x[i] - x[j]) + (y[i] - y[j]) * (y[i] - y[j]));
                        double   B   = Math.Sqrt((x[i] - x[k]) * (x[i] - x[k]) + (y[i] - y[k]) * (y[i] - y[k]));
                        double   C   = Math.Sqrt((x[k] - x[j]) * (x[k] - x[j]) + (y[k] - y[j]) * (y[k] - y[j]));
                        double   p   = (A + B + C) / 2.0;
                        double   S   = Math.Sqrt(p * (p - A) * (p - B) * (p - C));
                        double[] RAB = new double[2];
                        RAB[0] = x[i] - x[j];
                        RAB[1] = y[i] - y[j];
                        double[] RAC = new double[2];
                        RAC[0] = x[i] - x[k];
                        RAC[1] = y[i] - y[k];
                        double[] RCB = new double[2];
                        RCB[0] = x[k] - x[j];
                        RCB[1] = y[k] - y[j];
                        double AA  = (C * C * (RAB[0] * RAC[0] + RAB[1] * RAC[1])) / (8.0 * S * S);
                        double AB  = (B * B * (RAB[0] * RCB[0] + RAB[1] * RCB[1])) / (8.0 * S * S);
                        double AC  = (A * A * (-RAC[0] * RCB[0] - RAC[1] * RCB[1])) / (8.0 * S * S);
                        double X   = AA * x[i] + AB * x[j] + AC * x[k];
                        double Y   = AA * y[i] + AB * y[j] + AC * y[k];
                        double R2  = (x[i] - X) * (x[i] - X) + (y[i] - Y) * (y[i] - Y);
                        bool   fnd = true;
                        for (int t = 0; t < nn && fnd; ++t)
                        {
                            if (R2 > (x[t] - X) * (x[t] - X) + (y[t] - Y) * (y[t] - Y) + eps)
                            {
                                fnd = false;
                            }
                        }
                        if (fnd)
                        {
                            for (int t = 0; t < cntD; ++t)
                            {
                                if (D[t][0] == i && D[t][1] == j && D[t][2] == k)
                                {
                                    fnd = false;
                                    break;
                                }
                            }
                        }
                        if (fnd)
                        {
                            for (int t = 0; t < nn; ++t)
                            {
                                if (Math.Abs(R2 - (x[t] - X) * (x[t] - X) - (y[t] - Y) * (y[t] - Y)) < eps && t != i && t != j && t != k)
                                {
                                    //нужно проверить на пересечения треугольники
                                    pt Pt1 = new pt(x[i], y[i]);
                                    pt Pt2 = new pt(x[j], y[j]);
                                    pt Pt3 = new pt(x[k], y[k]);
                                    pt Pt4 = new pt(x[t], y[t]);
                                    if (intersect(Pt1, Pt2, Pt3, Pt4))
                                    {
                                        D[cntD][0] = i;
                                        D[cntD][1] = k;
                                        D[cntD][2] = t;
                                        //D[cntD][3] = t;
                                        for (int w = 0; w < 3; ++w)
                                        {
                                            for (int u = w + 1; u < 3; ++u)
                                            {
                                                if (D[cntD][w] > D[cntD][u])
                                                {
                                                    int tmp = D[cntD][w];
                                                    D[cntD][w] = D[cntD][u];
                                                    D[cntD][u] = tmp;
                                                }
                                            }
                                        }
                                        ++cntD;
                                        D[cntD][0] = k;
                                        D[cntD][1] = j;
                                        D[cntD][2] = t;
                                        //D[cntD][3] = t;
                                        for (int w = 0; w < 3; ++w)
                                        {
                                            for (int u = w + 1; u < 3; ++u)
                                            {
                                                if (D[cntD][w] > D[cntD][u])
                                                {
                                                    int tmp = D[cntD][w];
                                                    D[cntD][w] = D[cntD][u];
                                                    D[cntD][u] = tmp;
                                                }
                                            }
                                        }
                                        ++cntD;
                                    }
                                    Pt1 = new pt(x[i], y[i]);
                                    Pt2 = new pt(x[k], y[k]);
                                    Pt3 = new pt(x[j], y[j]);
                                    Pt4 = new pt(x[t], y[t]);
                                    if (intersect(Pt1, Pt2, Pt3, Pt4))
                                    {
                                        D[cntD][0] = j;
                                        D[cntD][1] = k;
                                        D[cntD][2] = t;
                                        //D[cntD][3] = t;
                                        for (int w = 0; w < 3; ++w)
                                        {
                                            for (int u = w + 1; u < 3; ++u)
                                            {
                                                if (D[cntD][w] > D[cntD][u])
                                                {
                                                    int tmp = D[cntD][w];
                                                    D[cntD][w] = D[cntD][u];
                                                    D[cntD][u] = tmp;
                                                }
                                            }
                                        }
                                        ++cntD;
                                        D[cntD][0] = i;
                                        D[cntD][1] = j;
                                        D[cntD][2] = t;
                                        //D[cntD][3] = t;
                                        for (int w = 0; w < 3; ++w)
                                        {
                                            for (int u = w + 1; u < 3; ++u)
                                            {
                                                if (D[cntD][w] > D[cntD][u])
                                                {
                                                    int tmp = D[cntD][w];
                                                    D[cntD][w] = D[cntD][u];
                                                    D[cntD][u] = tmp;
                                                }
                                            }
                                        }
                                        ++cntD;
                                    }
                                    Pt1 = new pt(x[j], y[j]);
                                    Pt2 = new pt(x[k], y[k]);
                                    Pt3 = new pt(x[i], y[i]);
                                    Pt4 = new pt(x[t], y[t]);
                                    if (intersect(Pt1, Pt2, Pt3, Pt4))
                                    {
                                        D[cntD][0] = i;
                                        D[cntD][1] = k;
                                        D[cntD][2] = t;
                                        for (int w = 0; w < 3; ++w)
                                        {
                                            for (int u = w + 1; u < 3; ++u)
                                            {
                                                if (D[cntD][w] > D[cntD][u])
                                                {
                                                    int tmp = D[cntD][w];
                                                    D[cntD][w] = D[cntD][u];
                                                    D[cntD][u] = tmp;
                                                }
                                            }
                                        }
                                        ++cntD;
                                        D[cntD][0] = j;
                                        D[cntD][1] = i;
                                        D[cntD][2] = t;
                                        //D[cntD][3] = t;
                                        for (int w = 0; w < 3; ++w)
                                        {
                                            for (int u = w + 1; u < 3; ++u)
                                            {
                                                if (D[cntD][w] > D[cntD][u])
                                                {
                                                    int tmp = D[cntD][w];
                                                    D[cntD][w] = D[cntD][u];
                                                    D[cntD][u] = tmp;
                                                }
                                            }
                                        }
                                        ++cntD;
                                    }
                                }
                            }
                            Tans[TMans][0] = i;
                            Tans[TMans][1] = j;
                            Tans[TMans][2] = k;
                            ++TMans;
                        }
                    }
                }
                drawTriangle();
            }
        }
Example #6
0
 int area(pt a, pt b, pt c)
 {
     return((b.x - a.x) * (c.y - a.y) - (b.y - a.y) * (c.x - a.x));
 }