example2.cpp

/*
    src/example2.cpp -- C++ version of an example application that shows
    how to use the form helper class. For a Python implementation, see
    '../python/example2.py'.

    NanoGUI was developed by Wenzel Jakob <wenzel.jakob@epfl.ch>.
    The widget drawing code is based on the NanoVG demo application
    by Mikko Mononen.

    All rights reserved. Use of this source code is governed by a
    BSD-style license that can be found in the LICENSE.txt file.
*/

#include <nanogui/nanogui.h>
#include <iostream>

using namespace nanogui;

enum test_enum {
    Item1 = 0,
    Item2,
    Item3
};

bool bvar = true;
int ivar = 12345678;
double dvar = 3.1415926;
float fvar = (float)dvar;
std::string strval = "A string";
test_enum enumval = Item2;
Color colval(0.5f, 0.5f, 0.7f, 1.f);

int main(int /* argc */, char ** /* argv */) {
    nanogui::init();

    /* scoped variables */ {
        bool use_gl_4_1 = false;// Set to true to create an OpenGL 4.1 context.
        Screen *screen = nullptr;

        if (use_gl_4_1) {
            // NanoGUI presents many options for you to utilize at your discretion.
            // See include/nanogui/screen.h for what all of these represent.
            screen = new Screen(Vector2i(500, 700), "NanoGUI test [GL 4.1]",
                                /*resizable*/true, /*fullscreen*/false, /*colorBits*/8,
                                /*alphaBits*/8, /*depthBits*/24, /*stencilBits*/8,
                                /*nSamples*/0, /*glMajor*/4, /*glMinor*/1);
        } else {
            screen = new Screen(Vector2i(500, 700), "NanoGUI test");
        }

        bool enabled = true;
        FormHelper *gui = new FormHelper(screen);
        ref<Window> window = gui->addWindow(Eigen::Vector2i(10, 10), "Form helper example");
        gui->addGroup("Basic types");
        gui->addVariable("bool", bvar);
        gui->addVariable("string", strval);

        gui->addGroup("Validating fields");
        gui->addVariable("int", ivar)->setSpinnable(true);
        gui->addVariable("float", fvar);
        gui->addVariable("double", dvar)->setSpinnable(true);

        gui->addGroup("Complex types");
        gui->addVariable("Enumeration", enumval, enabled)
           ->setItems({"Item 1", "Item 2", "Item 3"});
        gui->addVariable("Color", colval)
           ->setFinalCallback([](const Color &c) {
                 std::cout << "ColorPicker Final Callback: ["
                           << c.r() << ", "
                           << c.g() << ", "
                           << c.b() << ", "
                           << c.w() << "]" << std::endl;
             });

        gui->addGroup("Other widgets");
        gui->addButton("A button", []() { std::cout << "Button pressed." << std::endl; });

        screen->setVisible(true);
        screen->performLayout();
        window->center();

        nanogui::mainloop();
    }

    nanogui::shutdown();
    return 0;
}