bool Init()
{
// Initialize SDL's Video subsystem
if (SDL_Init(SDL_INIT_VIDEO) < 0)
{
std::cout << "Failed to init SDL\n";
return false;
}
// Create our window centered at 512x512 resolution
mainWindow = SDL_CreateWindow(programName.c_str(), SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
512, 512, SDL_WINDOW_OPENGL);
// Check that everything worked out okay
if (!mainWindow)
{
std::cout << "Unable to create window\n";
CheckSDLError(__LINE__);
return false;
}
// Create our opengl context and attach it to our window
mainContext = SDL_GL_CreateContext(mainWindow);
SetOpenGLAttributes();
// This makes our buffer swap syncronized with the monitor's vertical refresh
SDL_GL_SetSwapInterval(1);
// Init GLEW
//glewExperimental = GL_TRUE;
//glewInit();
return true;
}
int main()
{
SDL_Window *win;
SDL_Rect v;
TTF_Font *font;
SDL_Event myevent;
SDL_GLContext mainContext;
int choice, done=0;
if (SDL_Init (SDL_INIT_VIDEO) < 0)
{
fprintf (stderr, "Couldn't init video: %s\n", SDL_GetError ());
return (1);
}
/* Initialize the TTF library */
if (TTF_Init () < 0)
{
fprintf (stderr, "Couldn't initialize TTF: %s\n", SDL_GetError ());
SDL_Quit ();
return (2);
}
font = TTF_OpenFont ("FreeSans.ttf", DEFAULT_PTSIZE);
if (font == NULL)
{
fprintf (stderr, "Couldn't load font\n");
}
v.x = 0;
v.y = 0;
v.w = 720;
v.h = 600;
xvmin = v.x+5;
yvmin = v.y+5;
xvmax = v.w-130;
yvmax = v.h-10;
win= SDL_CreateWindow("View Bivariate Function", 0, 0, v.w, v.h, SDL_WINDOW_OPENGL);
if(win==NULL){
fprintf(stderr,"SDL_CreateWindow Error: %s\n",SDL_GetError());
SDL_Quit();
return 1;
}
SetOpenGLAttributes();
//Create our opengl context and attach it to our window
mainContext=SDL_GL_CreateContext(win);
init_menu(menu);
define_fun_grid(); /* griglia di approssimazione funzione bivariata*/
define_view(); /* calcolo dei parametri di vista */
display(win,menu,font,v);
while (done == 0)
{
if (SDL_PollEvent(&myevent))
{
SDL_EventState(0xff, SDL_IGNORE); //0xff is all events
switch(myevent.type)
{
case SDL_MOUSEMOTION:
if(myevent.motion.state==1)
{
opt_menu(menu,11,myevent.motion.x,myevent.motion.y,&choice);
switch(choice)
{
case 1: //choice==tetawin
tmpx = myevent.motion.x-(menu[1].rect.x+menu[1].rect.w/2);
tmpy = myevent.motion.y-(menu[1].rect.y+menu[1].rect.h/2);
teta = atan2(tmpy,tmpx);
display(win,menu,font,v);
break;
case 2: //choice==fiwin
tmpx = myevent.motion.x-(menu[2].rect.x+menu[2].rect.w/2);
tmpy = myevent.motion.y-(menu[2].rect.y+menu[2].rect.h/2);
fi = atan2(tmpy,tmpx);
display(win,menu,font,v);
break;
}
}
break;
case SDL_MOUSEBUTTONDOWN:
if(myevent.button.button==1)
{
opt_menu(menu,11,myevent.button.x,myevent.button.y,&choice);
switch(choice)
{
case 0: //choice == finewin
done = 1;
break;
case 7: //choice == rightwin
ssx=-sin(teta);
ssy=cos(teta);
csx-=sr*ssx;
csy-=sr*ssy;
display(win,menu,font,v);
break;
case 8: //choice == leftwin
ssx=-sin(teta);
ssy=cos(teta);
csx+=sr*ssx;
csy+=sr*ssy;
display(win,menu,font,v);
break;
case 9: //choice == upwin
ssx=-cos(fi)*cos(teta);
ssy=-cos(fi)*sin(teta);
ssz=sin(fi);
csx+=sr*ssx;
csy+=sr*ssy;
csz+=sr*ssz;
display(win,menu,font,v);
break;
case 10: //choice == downwin
ssx=-cos(fi)*cos(teta);
ssy=-cos(fi)*sin(teta);
ssz=sin(fi);
csx-=sr*ssx;
csy-=sr*ssy;
csz-=sr*ssz;
display(win,menu,font,v);
break;
case 3: //choice == ziwin
if (alpha-salpha >0)
alpha-=salpha;
display(win,menu,font,v);
break;
case 4: //choice == zowin
if (alpha+salpha <1.57)
alpha+=salpha;
display(win,menu,font,v);
break;
case 5: //choice == Dziwin
if (D-Dstep>0)
D-=Dstep;
display(win,menu,font,v);
break;
case 6: //choice == Dzowin
D+=Dstep;
display(win,menu,font,v);
break;
}
}
break;
case SDL_KEYDOWN:
if(myevent.key.keysym.sym == SDLK_ESCAPE)
done = 1;
break;
SDL_EventState(0xff, SDL_ENABLE);
}/* fine switch */
SDL_EventState(0xff, SDL_ENABLE);
}
} /* fine while */
TTF_CloseFont (font);
TTF_Quit ();
SDL_GL_DeleteContext(mainContext);
SDL_DestroyWindow(win);
SDL_Quit ();
return (0);
} /* fine main */