/*
Generate a random simple polygon inside a rectangle
vert is number of vertices (>= 3)
width, height are dimensions of rectangle
spacing (0 - 1 inclusive) determines random spacing along circle
sharpness (0 - 1 inclusive) determines how spiky polygon will be
*/
Polygon poly_mutator::randSimplePoly(const float spacing, const float sharpness) {
// get center of poly close to rectangle center with padding from edge
const int cenX = static_cast<int>((width / 2) + (randNorm() * width / 3));
const int cenY = static_cast<int>((height / 2) + (randNorm() * height / 3));
// polygon vertices
Polygon::Container v;
v.reserve(vertCount);
Point p;
// begin generating vertices
const float radInc = 2 * PI / vertCount;
float rad = randUni() * 2 * PI;
for (int vert = 0; vert < vertCount; ++vert, rad += radInc) {
float radRand = rad + radInc * randNorm() / 2.1 * spacing;
std::pair<float, float> intPoint = getPos(cenX, cenY, radRand, width, height);
// vector from center to intersection
float vx = intPoint.first - static_cast<float>(cenX);
float vy = intPoint.second - static_cast<float>(cenY);
// delta from center
float vMult = randNorm();
float dx = (vx / 2) * (1.0 + vMult * sharpness);
float dy = (vy / 2) * (1.0 + vMult * sharpness);
p.x = static_cast<int>(cenX + dx);
p.y = static_cast<int>(cenY + dy);
v.push_back(p);
}
return Polygon(v);
}
std::vector<double> directionPerturbation(const std::vector<double> &oVec,
double maxRadius, double pNorm)
{
// project on the k-1 simplex
std::vector<double> newObjVec(oVec);
toUnitVec(newObjVec, 1.0);
// calculate the p-distance
double dist = magnitudeP(oVec, pNorm);
// perturb within a sphere with r=maxRadius
double s = 0.0;
for(int i=0; i<newObjVec.size(); i++) {
double rd = (randUni() * 2.0 -1.0) * sqrt(maxRadius*maxRadius - s);
s += pow(rd, 2.0);
newObjVec[i] += rd;
}
// project on the p-norm unit sphere
toUnitVec(newObjVec, pNorm);
//scale back
scale(newObjVec, dist);
return newObjVec;
}
void ArrayTest::fill_array( int /*test_case_idx*/, int i, int j, Mat& arr )
{
if( i == REF_INPUT_OUTPUT )
cvtest::copy( test_mat[INPUT_OUTPUT][j], arr, Mat() );
else if( i == INPUT || i == INPUT_OUTPUT || i == MASK )
{
Scalar low, high;
get_minmax_bounds( i, j, arr.type(), low, high );
randUni( ts->get_rng(), arr, low, high );
}
}
