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api.cpp
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api.cpp
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#include "api.h"
CGAL::Bounded_side check(const Point_2& p, const vector<Point_2>& v){
return CGAL::bounded_side_2(v.begin(), v.end(),p, K());
}
double dis(const Point_2& v1, const Point_2& v2){
return sqrt(CGAL::squared_distance(v1, v2));
}
double tan_2(double a,double b, double c){
double s = (a + b + c) * 0.5;
if(abs(s - a) < 1e-4){
return 1e20;
}
else
return sqrt((s - b) * (s - c) / s / (s - a));
}
void PlainCopy(const Image& src, Image& tgt, int offsetx, int offsety, const vector<Point_2>& v){
for(int i = 0; i < src.w; i ++){
for(int j = 0; j < src.h; j ++){
Point_2 p(i, j);
if(check(p, v) == CGAL::ON_BOUNDED_SIDE)
tgt.drawPixel(offsetx + i, offsety + j, src.getPixel(i,j));
}
}
}
void ReadVertex(const string& filename, vector<Point_2>& v){
ifstream in;
in.open(filename, ios::in);
int cnt;
in >> cnt;
int x,y;
for(int i = 0; i < cnt; i ++){
in >> x >> y;
v.push_back(Point_2(x,y));
}
in.close();
}
void CalculateMeanValueCoordinate(const Point_2& p, double* lambda, const vector<Point_2>& v){
int vsize = v.size();
double* l = new double[vsize]; // length of pi - x;
int loc = -1;
for(int i = 0; i < vsize; i ++){
l[i] = dis(p,v[i]);
if(l[i] < 1e-4) {loc = i; break;}
}
if(loc >= 0){
for(int i = 0; i < vsize; i ++)
lambda[i] = 0;
lambda[loc] = 1;
}
else{
double* t = new double[vsize]; // tan(1/2 * L pi x pi+1)
double* w = new double[vsize]; // wi = tan(1/2 * ai-1) + tan( 1/2 * ai) / pi - x
double totw = 0.0;
delete[] t;
delete[] w;
for(int i = 0; i < vsize - 1; i ++){
t[i] = tan_2(dis(v[i + 1], v[i]), l[i + 1], l[i]);
}
t[vsize - 1] = tan_2(dis(v[0],v[vsize - 1]), l[0], l[vsize - 1]);
for(int i = 1; i < vsize; i ++){
totw += w[i] = (t[i - 1] + t[i]) / l[i];
}
totw += w[0] = (t[vsize - 1] + t[0]) / l[0];
totw = 1.0 / totw;
for(int i = 0; i < vsize; i ++){
lambda[i] = w[i] * totw;
}
}
delete[] l;
}
void MVCClone(const Image& src, Image& tgt, int offsetx, int offsety,const vector<Point_2>& v){
int vsize = v.size();
int sw = src.w;
int sh = src.h;
Color* diff = new Color[vsize];
for(int i = 0; i < vsize; i ++){
diff[i] = tgt.getPixel(v[i].x() + offsetx, v[i].y() + offsety) - src.getPixel(v[i].x(),v[i].y());
}
double*** lam = new double**[sw];
for(int i = 0; i < sw; i ++){
lam[i] = new double* [sh];
for(int j = 0; j < sh; j ++){
lam[i][j] = new double [vsize];
Point_2 p(i,j);
if(check(p,v) == CGAL::ON_BOUNDED_SIDE){
CalculateMeanValueCoordinate(p,lam[i][j],v);
Color r(0.0,0.0,0.0);
for(int k = 0; k < vsize; k ++){
r += lam[i][j][k] * diff[k];
}
tgt.drawPixel(i + offsetx, j + offsety, src.getPixel(i,j) + r);
}
}
}
delete[] diff;
for(int i = 0; i < sw; i ++){
for(int j = 0; j < sh; j ++)
delete[] lam[i][j];
delete[] lam[i];
}
delete[] lam;
}
void CreateMesh(CDT& cdt, const vector<Point_2>& v){
vector<Vertex_handle> vh;
int vsize = v.size();
for(auto p : v){
vh.push_back(cdt.insert(CDTPoint(p.x(),p.y())));
}
for(int i = 0; i < vsize; i ++){
cdt.insert_constraint(vh[i],vh[(i == vsize - 1) ? 0 : (i + 1)]);
}
cout << "Number of vertices : " << cdt.number_of_vertices() << endl;
cout << "Meshing the triangulation..." << endl;
CGAL::refine_Delaunay_mesh_2(cdt, Criteria(0.125,16));
cout << "Number of vertices : " << cdt.number_of_vertices() << endl;
}
Face_handle LocationQuery(const Point_2& p, CDT& cdt){
return cdt.locate(CDTPoint(p.x(),p.y()));
}
void GetVertices(CDT& cdt, vector<Point_2>& vs){
for(CDT::Finite_vertices_iterator vit = cdt.finite_vertices_begin(); vit != cdt.finite_vertices_end(); vit ++){
CDTPoint p = vit -> point();
vs.push_back(Point_2(p.x(),p.y()));
}
}
void ConvertToPoint_2(const Face_handle fh, vector<Point_2>& facep){
facep.clear();
for(int i = 0; i < 3; i ++){
CDTPoint p = fh -> vertex(i) -> point();
facep.push_back(Point_2(p.x(), p.y()));
}
}
void ShowMesh(Image img, const CDT& cdt){
for(CDT::Finite_edges_iterator eit = cdt.finite_edges_begin(); eit != cdt.finite_edges_end(); eit ++){
CDT::Face& f = *(eit -> first);
int i = eit -> second;
CDTPoint p1 = f.vertex(CDT::cw(i)) -> point();
CDTPoint p2 = f.vertex(CDT::ccw(i)) -> point();
img.drawLine(p1.x(),p1.y(), p2.x(), p2.y(),Color(255,0,0),1);
}
img.show("mesh");
img.save("../res/mesh1.jpg");
}
Vector3 GetWeight(const Point_2& sp, const vector<Point_2>& vertex){
float bax = vertex[1].x() - vertex[0].x();
float bay = vertex[1].y() - vertex[0].y();
float cax = vertex[2].x() - vertex[0].x();
float cay = vertex[2].y() - vertex[0].y();
float s = abs(bax * cay - cax * bay);
float pax = sp.x() - vertex[0].x();
float pay = sp.y() - vertex[0].y();
float pbx = sp.x() - vertex[1].x();
float pby = sp.y() - vertex[1].y();
float pcx = sp.x() - vertex[2].x();
float pcy = sp.y() - vertex[2].y();
float sa = abs(pbx * pcy - pcx * pby);
float sb = abs(pax * pcy - pcx * pay);
float u = sa / s;
float v = sb / s;
return Vector3(u, v, 1 - u - v);
}
void MVCCloneWithMesh(const Image& src, Image& tgt, int offsetx, int offsety, const vector<Point_2>& v){
int vsize = v.size();
int sw = src.w;
int sh = src.h;
CDT cdt;
//Triangulation(v,cdt);
CreateMesh(cdt, v);
vector<Point_2> meshv;
GetVertices(cdt, meshv);
Color* diff = new Color[vsize];
for(int i = 0; i < vsize; i ++){
diff[i] = tgt.getPixel(v[i].x() + offsetx, v[i].y() + offsety) - src.getPixel(v[i].x(),v[i].y());
}
double*** lam = new double**[sw];
Color** r = new Color*[sw];
for(int i = 0; i < sw; i ++){
lam[i] = new double* [sh];
r[i] = new Color[sh];
for(int j = 0; j < sh; j ++){
lam[i][j] = new double [vsize];
}
}
for(auto p : meshv){
int x = p.x();
int y = p.y();
CalculateMeanValueCoordinate(p, lam[x][y], v);
Color c(0.0,0.0,0.0);
for(int k = 0; k < vsize; k ++){
c += lam[x][y][k] * diff[k];
}
r[x][y] = c;
tgt.drawPixel(x + offsetx, y + offsety, src.getPixel(x,y) + c);
}
for(int i = 0; i < sw; i ++){
for(int j = 0; j < sh; j ++){
Point_2 p(i,j);
if(check(p,v) == CGAL::ON_BOUNDED_SIDE){
Face_handle fh = LocationQuery(p, cdt);
vector<Point_2> fp;
ConvertToPoint_2(fh, fp);
Vector3 weight = GetWeight(p, fp);
Color c = weight.x * r[(int)fp[0].x()][(int)fp[0].y()] +
weight.y * r[(int)fp[1].x()][(int)fp[1].y()] +
weight.z * r[(int)fp[2].x()][(int)fp[2].y()];
tgt.drawPixel(i + offsetx, j + offsety, src.getPixel(i,j) + c);
}
}
}
delete[] diff;
for(int i = 0; i < sw; i ++){
for(int j = 0; j < sh; j ++)
delete[] lam[i][j];
delete[] lam[i];
delete[] r[i];
}
delete[] lam;
delete[] r;
ShowMesh(src, cdt);
waitKey(0);
}