{

mplot::Visual v(1600, 1000, "Demo of sm::hexgrid::resampleImage");

sm::hexgrid hg(0.01f, 3.0f, 0.0f);

hg.setCircularBoundary (1.2f);

// Load an image with the help of mplot::loadpng().

std::string fn = "../examples/bike256.png";

sm::vvec<float> image_data;

sm::vec<unsigned int, 2> dims = mplot::loadpng (fn, image_data);

// This controls how large the photo will be on the HexGrid

sm::vec<float,2> image_scale = {1.8f, 1.8f};

// You can shift the photo with an offset if necessary

sm::vec<float,2> image_offset = {0.0f, 0.0f};

// Here's the HexGrid method that will resample the square pixel grid onto the hex grid

sm::vvec<float> hex_image_data = hg.resampleImage (image_data, dims[1], image_scale, image_offset);

// Now visualise with a HexGridVisual

auto hgv = std::make_unique<mplot::HexGridVisual<float>>(&hg, sm::vec<float>({0,0,0}));

v.bindmodel (hgv);

// Set the image data as the scalar data for the HexGridVisual

hgv->setScalarData (&hex_image_data);

// The inverse greyscale map is appropriate for a monochrome image

hgv->cm.setType (mplot::ColourMapType::GreyscaleInv);

// As it's an image, we don't want relief, so set the zScale to have a zero gradient

hgv->zScale.set_params (0, 1);

hgv->finalize();

v.addVisualModel (hgv);

v.keepOpen();

return 0;