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#include "fracture.h"
double th_p(double x, double y, double th) {
if (x >= 0 && y >= 0) return th;
if (x < 0 && y >= 0) return M_PI - th;
if (x < 0 && y < 0) return th - M_PI;
if (x >= 0 && y < 0) return -th;
}
double u_y(double x, double y) {
double r = sqrt(pow(x, 2) + pow(y, 2));
double th = th_p(x, y, atan(fabs(y / x)));
return sqrt(r) * sin(th / 2);
}
void voronoi_bound_ini(net_t *instance, uint_t L, double crack_len) {
double *bound = (double *)instance->boundary_cond->x;
for (uint_t i = 0; i < L / 2; i++) {
double x1, y1, x2, y2, x3, y3, x4, y4;
x1 = (2. * i + 1.) / L - crack_len; y1 = 0.5 - 1.;
x2 = (2. * i + 1.) / L - crack_len; y2 = 0.5 - 0.;
y3 = (2. * i + 1.) / L - 0.5; x3 = 0.5 - 1.;
y4 = (2. * i + 1.) / L - 0.5; x4 = 0.5 - 0.;
bound[i] = u_y(x1, y1);
bound[L / 2 + i] = u_y(x2, y2);
bound[L + i] = u_y(x3, y3);
bound[3 * L / 2 + i] = u_y(x4, y4);
}
}
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