update src
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tin.h
76
tin.h
@ -13,6 +13,8 @@
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#include "vector"
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#include "algorithm"
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#include "iostream"
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#define ZERO 1e-5
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// Start vertex definition
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@ -77,11 +79,14 @@ bool operator ==(const edge &a, const edge &b) // overload the == operator for e
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// End edge definition
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// Start triangle definition
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struct dem_point;
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struct triangle
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{
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vertex2dc *vert[3]; // vertex of the triangle
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double cx, cy; // center of the triangle's circumcircle
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double cr; // radius of the circumcircle
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std::vector<dem_point*> circum_dem;
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triangle() {vert[0] = vert[1] = vert[2] = nullptr;}
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triangle(vertex2dc *v0ptr, vertex2dc *v1ptr, vertex2dc *v2ptr) {set(v0ptr, v1ptr, v2ptr);}
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@ -264,6 +269,7 @@ void dem2tin(const std::vector<double> &dem, double xmin, double xmax, double ym
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if ((dist - out_tris[t]->cr) <= ZERO) // Points on the circumcircle are also included
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{
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dem_grid[i]->circum_host.push_back(out_tris[t]);
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out_tris[t]->circum_dem.push_back(dem_grid[i]);
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// no beak here. There might be more than one triangle's circumcircle includes the DEM location
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}
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}
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@ -301,12 +307,12 @@ void dem2tin(const std::vector<double> &dem, double xmin, double xmax, double ym
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cnst_tri.push_back(dem_grid[0]->circum_host[i]);
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}
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for (int i = 0; i < cnst_tri.size(); ++i)
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for (int c = 0; c < cnst_tri.size(); ++c)
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{
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for (t_iter = out_tris.begin(); t_iter != out_tris.end(); )
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{
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tmp_tri = *t_iter;
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if (cnst_tri[i] == tmp_tri)
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if (cnst_tri[c] == tmp_tri)
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{
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t_iter = out_tris.erase(t_iter);
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break; // no need to search more
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@ -315,10 +321,41 @@ void dem2tin(const std::vector<double> &dem, double xmin, double xmax, double ym
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}
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}
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// remove cnst_tri from its circumed DEM's circum triangle list
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for (int c = 0; c < cnst_tri.size(); ++c)
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{
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for (int i = 0; i < cnst_tri[c]->circum_dem.size(); ++i)
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{
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tmp_dem = cnst_tri[c]->circum_dem[i];
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for (t_iter = tmp_dem->circum_host.begin(); t_iter != tmp_dem->circum_host.end(); )
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{
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if (cnst_tri[c] == *t_iter)
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{
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t_iter = tmp_dem->circum_host.erase(t_iter);
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break;
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}
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else t_iter++;
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}
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}
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}
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// remove dem_grid[0] from its circumed triangle's circum DEM list
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for (int c = 0; c < cnst_tri.size(); ++c)
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{
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for (d_iter = cnst_tri[c]->circum_dem.begin(); d_iter != cnst_tri[c]->circum_dem.end(); )
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{
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if (dem_grid[0] == *d_iter)
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{
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d_iter = cnst_tri[c]->circum_dem.erase(d_iter);
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break;
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}
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else d_iter++;
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}
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}
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// clear host and circumcircle triangles for the used DEM location
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dem_grid[0]->circum_host.clear();
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d_iter = dem_grid.begin();
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tmp_dem = *d_iter; delete tmp_dem;
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tmp_dem = *d_iter; tmp_dem->circum_host.clear(); delete tmp_dem;
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dem_grid.erase(d_iter);
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// loop to remove duplicate edges
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@ -360,38 +397,26 @@ void dem2tin(const std::vector<double> &dem, double xmin, double xmax, double ym
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}
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}
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// purge circumcircle triangles for all DEM data
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// loop all DEM data to update host triangles
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for (int c = 0; c < cnst_tri.size(); ++c)
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{
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for (int i = 0; i < dem_grid.size(); ++i)
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{
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for (t_iter = dem_grid[i]->circum_host.begin(); t_iter != dem_grid[i]->circum_host.end(); )
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{
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if (cnst_tri[c] == *t_iter)
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{
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t_iter = dem_grid[i]->circum_host.erase(t_iter);
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break; // no need to search more
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}
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else t_iter++;
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}
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}
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}
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// loop all DEM data to update host and circumcircle triangles
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for (int i = 0; i < dem_grid.size(); ++i)
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for (int i = 0; i < cnst_tri[c]->circum_dem.size(); ++i)
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{
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tmp_dem = cnst_tri[c]->circum_dem[i];
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for (int n = 0; n < new_tri.size(); ++n) // search in newly created triangles to find new host
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{
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if (new_tri[n]->bound_location(dem_grid[i]->x, dem_grid[i]->y))
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if (new_tri[n]->bound_location(tmp_dem->x, tmp_dem->y))
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{
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dem_grid[i]->host = new_tri[n];
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dem_grid[i]->err = fabs(new_tri[n]->interpolate(dem_grid[i]->x, dem_grid[i]->y) - dem_grid[i]->elev);
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tmp_dem->host = new_tri[n];
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tmp_dem->err = fabs(new_tri[n]->interpolate(tmp_dem->x, tmp_dem->y) - tmp_dem->elev);
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break; // already found, no need to search more
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}
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}
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}
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}
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// Find circum_host triangles for all DEM locations
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// cnst_tri's circum area doesn't over cover new_tri's circum area
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for (int i = 0; i < dem_grid.size(); ++i)
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{
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for (int n = 0; n < new_tri.size(); ++n) // search in newly created triangles to find new circumcircle triangles
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@ -400,16 +425,19 @@ void dem2tin(const std::vector<double> &dem, double xmin, double xmax, double ym
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+ (new_tri[n]->cy - dem_grid[i]->y) * (new_tri[n]->cy - dem_grid[i]->y);
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if ((dist - new_tri[n]->cr) <= ZERO) // Points on the circumcircle are also included
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{
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new_tri[n]->circum_dem.push_back(dem_grid[i]);
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dem_grid[i]->circum_host.push_back(new_tri[n]);
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// no beak here. There might be more than one triangle's circumcircle includes the DEM location
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}
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}
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}
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// destroy memories used by cnst_edge
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for (int c = 0; c < cnst_tri.size(); ++c)
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{
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tmp_tri = cnst_tri[c];
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tmp_tri->circum_dem.clear();
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delete tmp_tri; tmp_tri = nullptr;
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}
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