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#if defined(_MSC_VER) /* MSVC Compiler */
#pragma warning ( disable : 4786 )
#endif
#include <stdlib.h> // qsort
#include <algorithm>
#include <float.h>
#include "qwt3d_types.h"
using namespace Qwt3D;
#ifndef QWT3D_NOT_FOR_DOXYGEN
namespace {
// convex hull
typedef double coordinate_type;
int ccw(coordinate_type **P, int i, int j, int k) {
coordinate_type a = P[i][0] - P[j][0],
b = P[i][1] - P[j][1],
c = P[k][0] - P[j][0],
d = P[k][1] - P[j][1];
return a*d - b*c <= 0; /* true if points i, j, k counterclockwise */
}
#define CMPM(c,A,B) \
v = (*(coordinate_type**)A)[c] - (*(coordinate_type**)B)[c];\
if (v>0) return 1;\
if (v<0) return -1;
int cmpl(const void *a, const void *b) {
double v;
CMPM(0,a,b);
CMPM(1,b,a);
return 0;
}
int cmph(const void *a, const void *b) {return cmpl(b,a);}
int make_chain(coordinate_type** V, int n, int (*cmp)(const void*, const void*)) {
int i, j, s = 1;
coordinate_type* t;
qsort(V, n, sizeof(coordinate_type*), cmp);
for (i=2; i<n; i++) {
for (j=s; j>=1 && ccw(V, i, j, j-1); j--){}
s = j+1;
t = V[s]; V[s] = V[i]; V[i] = t;
}
return s;
}
int _ch2d(coordinate_type **P, int n) {
int u = make_chain(P, n, cmpl); /* make lower hull */
if (!n) return 0;
P[n] = P[0];
return u+make_chain(P+u, n-u+1, cmph); /* make upper hull */
}
} // ns anon
GridData::GridData()
{
datatype = Qwt3D::GRID;
setSize(0,0);
setPeriodic(false,false);
}
GridData::GridData(unsigned int columns, unsigned int rows)
{
datatype = Qwt3D::GRID;
setSize(columns,rows);
setPeriodic(false,false);
}
int GridData::columns() const
{
return (int)vertices.size();
}
int GridData::rows() const
{
return (empty()) ? 0 : (int)vertices[0].size();
}
void GridData::clear()
{
setHull(ParallelEpiped());
{
for (unsigned i=0; i!=vertices.size(); ++i)
{
for (unsigned j=0; j!=vertices[i].size(); ++j)
{
delete [] vertices[i][j];
}
vertices[i].clear();
}
}
vertices.clear();
{
for (unsigned i=0; i!=normals.size(); ++i)
{
for (unsigned j=0; j!=normals[i].size(); ++j)
{
delete [] normals[i][j];
}
normals[i].clear();
}
}
normals.clear();
}
void GridData::setSize(unsigned int columns, unsigned int rows)
{
this->clear();
vertices = std::vector<DataRow>(columns);
{
for (unsigned int i=0; i!=vertices.size(); ++i)
{
vertices[i] = DataRow(rows);
for (unsigned int j=0; j!=vertices[i].size(); ++j)
{
vertices[i][j] = new GLdouble[3];
}
}
}
normals = std::vector<DataRow>(columns);
{
for (unsigned int i=0; i!=normals.size(); ++i)
{
normals[i] = DataRow(rows);
for (unsigned int j=0; j!=normals[i].size(); ++j)
{
normals[i][j] = new GLdouble[3];
}
}
}
}
Triple const& CellData::operator()(unsigned cellnumber, unsigned vertexnumber)
{
return nodes[cells[cellnumber][vertexnumber]];
}
void CellData::clear()
{
setHull(ParallelEpiped());
cells.clear();
nodes.clear();
normals.clear();
}
QColor Qwt3D::GL2Qt(GLdouble r, GLdouble g, GLdouble b)
{
return QColor(round(r * 255), round(g * 255), round(b * 255));
}
RGBA Qwt3D::Qt2GL(QColor col)
{
QRgb qrgb = col.rgb();
RGBA rgba;
rgba.r = qRed(qrgb) / 255.0;
rgba.g = qGreen(qrgb) / 255.0;
rgba.b = qBlue(qrgb) / 255.0;
rgba.a = qAlpha(qrgb) / 255.0;
return rgba;
}
void Qwt3D::convexhull2d( std::vector<unsigned>& idx, const std::vector<Tuple>& src )
{
idx.clear();
if (src.empty())
return;
if (src.size()==1)
{
idx.push_back(0);
return;
}
coordinate_type** points = new coordinate_type*[src.size()+1] ;
coordinate_type* P = new coordinate_type[src.size()*2];
int i;
for (i=0; i<(int)src.size(); ++i)
{
points[i] = &P[2*i];
points[i][0] = src[i].x;
points[i][1] = src[i].y;
}
coordinate_type* start = points[0];
int m = _ch2d( points, src.size() );
idx.resize(m);
for (i=0; i<m; ++i)
{
idx[i] = (points[i] - start)/2;
}
delete [] points;
delete [] P;
}
unsigned Qwt3D::tesselationSize(CellField const& t)
{
unsigned ret = 0;
for (unsigned i=0; i!=t.size(); ++i)
ret += t[i].size();
return ret;
}
#endif // QWT3D_NOT_FOR_DOXYGEN
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