{

// Contructor args are width, height, title

mplot::Visual<mplot::gl::version_4_1> v(1600, 1000, "mplot::HexGridVisual");

// You can set a field of view (in degrees)

v.fov = 15;

// set the x/y offset. Try pressing 'z' in the app window to see what the current sceneTrans is

v.setSceneTransXY (0.0f, 0.0f);

// Make this larger to "scroll in and out of the image" faster. 0.02f is the default in VisualBase.

v.scenetrans_stepsize = 0.02f;

// The coordinate arrows can be hidden

v.showCoordArrows (true);

// You can set the background (white, black, or any other colour)

v.backgroundWhite();

// You can switch on the "lighting shader" which puts diffuse light into the scene

//v.lightingEffects();

// Add some text labels to the scene

v.addLabel ("This is a\nmplot::HexGridVisual\nobject", {0.26f, -0.16f, 0.0f});

// Create a HexGrid to show in the scene. Hexes outside the circular boundary will

// all be discarded.

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

hg.setCircularBoundary (0.6f);

std::cout << "Number of pixels in grid:" << hg.num() << std::endl;

// Make some dummy data (a sine wave) to make an interesting surface

std::vector<float> data(hg.num(), 0.0f);

for (unsigned int ri = 0; ri < hg.num(); ++ri) {

data[ri] = 0.05f + 0.05f * std::sin (20.0f * hg.d_x[ri]) * std::sin (10.0f * hg.d_y[ri]) ; // Range 0->1

}

// Add a HexGridVisual to display the HexGrid within the sm::Visual scene

sm::vec<float, 3> offset = { 0.0f, -0.05f, 0.0f };

auto hgv = std::make_unique<mplot::HexGridVisual<float, mplot::gl::version_4_1>>(&hg, offset);

v.bindmodel (hgv);

hgv->wireframe (true);

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

hgv->setScalarData (&data);

hgv->hexVisMode = mplot::HexVisMode::HexInterp; // Or sm::HexVisMode::Triangles for a smoother surface plot

hgv->finalize();

if (v.checkContext() == true) {

std::cout << "I have the context after hgv->finalize()\n";

} else {

std::cout << "I don't have the context after hgv->finalize()\n";

}

v.addVisualModel (hgv);

if (v.checkContext() == true) {

std::cout << "I have the context after addVisualModel\n";

} else {

std::cout << "I don't have the context after addVisualModel()\n";

}

v.keepOpen();

if (v.checkContext() == true) {

std::cout << "I have the context after user requested exit\n";

} else {

std::cout << "I don't have the context after user requested exit\n";

}

return 0;