Minimal AntTweakBar integration with GLFW

GUI.cpp

#include <assert.h>
#include <GLFW/glfw3.h>
#include <swnt/GUI.h>

GUI::GUI() 
  :win_w(0)
  ,win_h(0)
{
}

bool GUI::setup(int w, int h) {
  assert(w);
  assert(h);
  win_w = w;
  win_h = h;

  TwInit(TW_OPENGL_CORE, NULL);
  bar = TwNewBar("SWNT");
  TwAddVarRW(bar, "speed", TW_TYPE_DOUBLE, &test, "min=0 max=10 step=0.1 help='test'");

  TwWindowSize(win_w, win_h);
  return true;
}

void GUI::onResize(int w, int h) {
  win_w = w;
  win_h = h;
  TwWindowSize(w, h);
}

void GUI::onMouseMoved(double x, double y) {
  TwMouseMotion(x, y);
}

void GUI::onMouseClicked(int bt, int action) {
  TwMouseButtonID btn = (bt == 0) ? TW_MOUSE_LEFT : TW_MOUSE_RIGHT;
  TwMouseAction ma = (action == GLFW_PRESS) ? TW_MOUSE_PRESSED : TW_MOUSE_RELEASED;
  TwMouseButton(ma, btn);
}

void GUI::onKeyPressed(int key, int mod) {

  switch(key) {
    case GLFW_KEY_LEFT: key = TW_KEY_LEFT; break;
    case GLFW_KEY_RIGHT: key = TW_KEY_RIGHT; break;
    case GLFW_KEY_UP: key = TW_KEY_UP; break;
    case GLFW_KEY_DOWN: key = TW_KEY_DOWN; break;
    default: break;
  }

  int tw_mod = TW_KMOD_NONE;

  if(mod & GLFW_MOD_SHIFT) {
    tw_mod |= TW_KMOD_SHIFT;
  }

  if(mod & GLFW_MOD_CONTROL) {
    tw_mod |= TW_KMOD_CTRL;
  }

  if(mod & GLFW_MOD_ALT) {
    tw_mod |= TW_KMOD_ALT;
  }

  TwKeyPressed(key, TW_KMOD_NONE);
}

void GUI::draw() {
  TwDraw();
}

GUI.h

#ifndef SWNT_GUI_H
#define SWNT_GUI_H

#include <stdio.h>
#include <AntTweakBar.h>

class GUI {
 public:
  GUI();
  bool setup(int w, int h);
  void onMouseMoved(double x, double y);
  void onMouseClicked(int bt, int action);
  void onKeyPressed(int key, int mod);
  void onResize(int w, int h);
  void draw();
 public:
  int win_w;
  int win_h;
  TwBar* bar;
  double test;
};

#endif