| | |
| | | /* vim: set ts=4 sts=4 sw=4 noet : */ |
| | | #include<stdlib.h> |
| | | #include<math.h> |
| | | #include<string.h> |
| | |
| | | return TS_SUCCESS; |
| | | } |
| | | |
| | | /** Calculates the triple product of vectors defined by vertices vtx1, vtx2 and vtx3, ($\mathrm{vtx}_1\cdot(\mathrm{vtx}_2\cross\mathrm{vtx}_3$): |
| | | * \begin{vmatrix} |
| | | * x_1 & y_1 & z_1 \\ |
| | | * x_2-x_1 & y_2-y_1 & z_2-z_1\\ |
| | | * x_3-x_1 & y_3-y_1 & z_3-z_1\\ |
| | | * \end{vmatrix} |
| | | * where the vertices coordinates are denoted by corresponding vertex index number. Function is used to determine the orientation of area formed by triangle formed by the three given vertices. |
| | | * |
| | | * @param vtx1 is first vertex, according to which the orientation is calculated |
| | | * @param vtx2 is the second vertex |
| | | * @param vtx3 is the third vertex |
| | | * @returns directionality of the area of the triangle formed by vertices vtx1, vtx2 and vtx3. It is positive if vtx1, vtx2 and vtx3 are oriented counter-clockwise. |
| | | */ |
| | | inline ts_double vtx_direct(ts_vertex *vtx1, ts_vertex *vtx2, ts_vertex *vtx3){ |
| | | ts_double dX2=vtx2->x-vtx1->x; |
| | | ts_double dY2=vtx2->y-vtx1->y; |