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update to std::sort

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张壹 2021-09-17 11:05:59 +08:00
parent d6984a3270
commit f08a549746
5 changed files with 175 additions and 136 deletions
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82
.vscode/settings.json vendored Normal file
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@ -0,0 +1,82 @@
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12
demo.cpp
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@ -6,10 +6,10 @@
int main(int argc, char const *argv[]) int main(int argc, char const *argv[])
{ {
// read dem grid // read dem grid
std::vector<double> topo(1002001); std::vector<double> topo(10201);
std::ifstream infile("topo2.txt"); std::ifstream infile("topo.txt");
for (int i = 0; i < 1002001; ++i) for (int i = 0; i < 10201; ++i)
{ {
infile >> topo[i]; infile >> topo[i];
} }
@ -18,10 +18,10 @@ int main(int argc, char const *argv[])
std::vector<double> err_records; std::vector<double> err_records;
std::vector<vertex2dc*> tin_vert; std::vector<vertex2dc*> tin_vert;
std::vector<triangle*> tin_ele; std::vector<triangle*> tin_ele;
dem2tin(topo, 0, 1000, 0, 1000, 1, 1, tin_vert, tin_ele, 10.0, &err_records); dem2tin(topo, 0, 1000, 0, 1000, 10, 10, tin_vert, tin_ele, 1.0, &err_records);
// Write a log file // Write a log file
std::ofstream logfile("topo2_TIN.log"); std::ofstream logfile("topo_TIN.log");
logfile << "# Insertion Maxi-Error\n"; logfile << "# Insertion Maxi-Error\n";
for (int i = 0; i < err_records.size(); ++i) for (int i = 0; i < err_records.size(); ++i)
{ {
@ -30,7 +30,7 @@ int main(int argc, char const *argv[])
logfile.close(); logfile.close();
// Write a Gmsh's .msh file // Write a Gmsh's .msh file
std::ofstream outfile("topo2_TIN.msh"); std::ofstream outfile("topo_TIN.msh");
outfile << "$MeshFormat" << std::endl << "2.2 0 8" << std::endl << "$EndMeshFormat "<<std::endl; outfile << "$MeshFormat" << std::endl << "2.2 0 8" << std::endl << "$EndMeshFormat "<<std::endl;
outfile << "$Nodes" << std::endl << tin_vert.size() << std::endl; outfile << "$Nodes" << std::endl << tin_vert.size() << std::endl;
for (int i = 0; i < tin_vert.size(); i++) for (int i = 0; i < tin_vert.size(); i++)

67
tin.h
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@ -11,6 +11,7 @@
#define _TIN_DELAUNAY_H #define _TIN_DELAUNAY_H
#include "cmath" #include "cmath"
#include "vector" #include "vector"
#include "algorithm"
#define ZERO 1e-5 #define ZERO 1e-5
@ -22,8 +23,8 @@ struct vertex2dc
double elev; // elevation at the vertex double elev; // elevation at the vertex
vertex2dc() : x(NAN), y(NAN), elev(NAN), id(0) {} vertex2dc() : x(NAN), y(NAN), elev(NAN), id(0) {}
vertex2dc(double inx, double iny, double inelev, unsigned int inid = 0) {set(inx, iny, inelev, inid);} vertex2dc(double inx, double iny, double inelev, unsigned int inid) {set(inx, iny, inelev, inid);}
void set(double inx, double iny, double inelev, unsigned int inid = 0) void set(double inx, double iny, double inelev, unsigned int inid)
{ {
x = inx; y = iny; elev = inelev; id = inid; x = inx; y = iny; elev = inelev; id = inid;
return; return;
@ -131,7 +132,7 @@ struct dem_point
{ {
double x, y; // position of the DEM location double x, y; // position of the DEM location
double elev; // elevation at the DEM location double elev; // elevation at the DEM location
double err; double err; // error of the TIN with respect to the elevation
triangle *host; // host triangle of the DEM location triangle *host; // host triangle of the DEM location
std::vector<triangle*> circum_host; // triangles which circumcircles include the location std::vector<triangle*> circum_host; // triangles which circumcircles include the location
@ -144,55 +145,10 @@ struct dem_point
} }
}; };
/** bool compare_dem_point(dem_point *a, dem_point *b)
* @brief Utility function of the heap_sort function.
*
* @param a Input vector
* @param[in] i vector's index i
* @param[in] n vector's index n
*/
void update_heap(std::vector<dem_point*> &a, int i, int n)
{ {
int iMax = i, iLeft = 2 * i + 1, iRight = 2 * (i + 1); if (a->err > b->err) return true;
return false;
if (iLeft < n && a[iMax]->err > a[iLeft]->err)
{
iMax = iLeft;
}
if (iRight < n && a[iMax]->err > a[iRight]->err)
{
iMax = iRight;
}
if (iMax != i)
{
dem_point *tmp = a[iMax]; a[iMax] = a[i]; a[i] = tmp;
update_heap(a, iMax, n);
}
return;
}
/**
* @brief Heap sort of the dem_point vector in a descending order with respect to the error values
*
* @param a Input vector
*/
void heap_sort(std::vector<dem_point*> &a)
{
int n = a.size();
for (int i = (n - 1) / 2; i >= 0; i--)
{
update_heap(a, i, n);
}
dem_point *tmp;
for (int i = n - 1; i > 0; --i)
{
tmp = a[i]; a[i] = a[0]; a[0] = tmp;
update_heap(a, 0, i);
}
return;
} }
// End DEM definition // End DEM definition
@ -228,7 +184,7 @@ void dem2tin(const std::vector<double> &dem, double xmin, double xmax, double ym
if (dem.size() != xnum*ynum) return; if (dem.size() != xnum*ynum) return;
// Prepare the DEM points // Prepare the DEM points
dem_point *tmp_dem; dem_point *tmp_dem = nullptr;;
std::vector<dem_point*> dem_grid(xnum*ynum); std::vector<dem_point*> dem_grid(xnum*ynum);
std::vector<dem_point*>::iterator d_iter; std::vector<dem_point*>::iterator d_iter;
for (int i = 0; i < ynum; ++i) for (int i = 0; i < ynum; ++i)
@ -240,7 +196,6 @@ void dem2tin(const std::vector<double> &dem, double xmin, double xmax, double ym
} }
vertex2dc *tmp_vert = nullptr; vertex2dc *tmp_vert = nullptr;
tmp_vert = new vertex2dc(xmin, ymin, dem_grid[0]->elev, out_verts.size()); // lower left corner tmp_vert = new vertex2dc(xmin, ymin, dem_grid[0]->elev, out_verts.size()); // lower left corner
out_verts.push_back(tmp_vert); out_verts.push_back(tmp_vert);
@ -320,7 +275,8 @@ void dem2tin(const std::vector<double> &dem, double xmin, double xmax, double ym
dem_grid[i]->err = fabs(dem_grid[i]->host->interpolate(dem_grid[i]->x, dem_grid[i]->y) - dem_grid[i]->elev); dem_grid[i]->err = fabs(dem_grid[i]->host->interpolate(dem_grid[i]->x, dem_grid[i]->y) - dem_grid[i]->elev);
} }
heap_sort(dem_grid); // Sort dem_grid in the desceding order with respect to the error
std::sort(dem_grid.begin(), dem_grid.end(), compare_dem_point);
bool removed; bool removed;
edge tmp_edge; edge tmp_edge;
@ -457,7 +413,8 @@ void dem2tin(const std::vector<double> &dem, double xmin, double xmax, double ym
delete tmp_tri; tmp_tri = nullptr; delete tmp_tri; tmp_tri = nullptr;
} }
heap_sort(dem_grid); // Sort dem_grid in the desceding order with respect to the error
std::sort(dem_grid.begin(), dem_grid.end(), compare_dem_point);
} }
if (err_records != nullptr) if (err_records != nullptr)

14
topo_TIN.log
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@ -1276,9 +1276,9 @@
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1282 1.90845 1282 1.90845
1283 1.8675 1283 1.8675
@ -2086,10 +2086,10 @@
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2086 1.1363 2086 1.1363
2087 1.136 2087 1.136
2088 1.4285 2088 2.002
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2091 2.002 2091 3.5135
2092 1.1352 2092 1.1352
2093 1.69885 2093 1.69885
2094 1.1346 2094 1.1346

136
topo_TIN.msh
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