//---------------------------------------------------------------------
// Priklad cislo 13
// Autor: Pavel Tisnovsky
//
// Vytvoreni dvou kaskadovych menu z nichz kazde je navazano na jine
// tlacitko mysi (leve tlacitko vybira barvu, prave zpusob zobrazeni)
//---------------------------------------------------------------------
#include <GL/glut.h> // hlavickovy soubor funkci GLUTu
enum {
BlackColor=0x000000, // cisla prikazu ve svem kodu
GrayColor=0x808080, // primo obsahuji zvolenou barvu
RedColor=0xff0000,
GreenColor=0x00ff00,
BlueColor=0x0000ff,
WhiteColor=0xffffff
} commands;
#define FullScreen 1 // prikazy pro druhe menu
#define Window 2
#define Quit 3
#define NoQuit 4
float firstColor[3]={0.3, 0.3, 0.3}; // barevne slozky jednotlivych vertexu
float secondColor[3]={0.3, 0.3, 0.3};
float thirdColor[3]={0.3, 0.3, 0.3};
int width=0, height=0; // velikost okna
//---------------------------------------------------------------------
// Nastaveni souradneho systemu v zavislosti na velikosti okna
//---------------------------------------------------------------------
void onResize(int w, int h) // w a h reprezentuje novou velikost okna
{
glViewport(0, 0, w, h); // viditelna oblast pres cele okno
glMatrixMode(GL_PROJECTION); // zacatek modifikace projekcni matice
glLoadIdentity(); // vymazani projekcni matice (=identita)
glOrtho(0, w, 0, h, -1, 1); // mapovani abstraktnich souradnic do souradnic okna
glScalef(1, -1, 1); // inverze y-ove osy, aby se y zvetsovalo smerem dolu
glTranslatef(0, -h, 0); // posun pocatku do leveho horniho rohu
width=w; // zapamatovat si velikost okna
height=h;
}
//---------------------------------------------------------------------
// Tato funkce je volana pri kazdem prekresleni okna
//---------------------------------------------------------------------
void onDisplay(void)
{
glClear(GL_COLOR_BUFFER_BIT); // vymazani bitovych rovin barvoveho bufferu
glBegin(GL_TRIANGLES);
glColor3f(firstColor[0], firstColor[1], firstColor[2]);// barva prvniho vertexu
glVertex2i(width>>1, 0); // pozice prvniho vertexu
glColor3f(secondColor[0], secondColor[1], secondColor[2]);// barva druheho vertexu
glVertex2i(0, height-1); // pozice druheho vertexu
glColor3f(thirdColor[0], thirdColor[1], thirdColor[2]);// barva tretiho vertexu
glVertex2i(width-1, height-1); // pozice tretiho vertexu
glEnd();
glFlush(); // provedeni a vykresleni zmen
}
//---------------------------------------------------------------------
// Tato funkce je volana pri stlaceni ASCII klavesy
//---------------------------------------------------------------------
void onKeyboard(unsigned char key, int x, int y)
{
key=(key>'A' && key<='Z') ? key+'a'-'A':key; // prevod na mala pismena
switch (key) {
case 27: // Escape
exit(0);
break;
case 'f':
glutFullScreen(); // prepnuti na celou obrazovku
break;
case 'w':
glutReshapeWindow(400, 400);// prepnuti zpet do okna
glutPositionWindow(50, 50);
break;
default:
break;
}
}
//---------------------------------------------------------------------
// Tato funkce je zavolana pri vyberu polozky z prvniho menu
//---------------------------------------------------------------------
void onFirstMenuCommand(int command)
{
if (((command >> 24) & 0xff)==1) { // zmena barvy prvniho vertexu
firstColor[0]=((command >> 16) & 0xff)/255.0;
firstColor[1]=((command >> 8) & 0xff)/255.0;
firstColor[2]=(command & 0xff)/255.0;
}
if (((command >> 24) & 0xff)==2) { // zmena barvy druheho vertexu
secondColor[0]=((command >> 16) & 0xff)/255.0;
secondColor[1]=((command >> 8) & 0xff)/255.0;
secondColor[2]=(command & 0xff)/255.0;
}
if (((command >> 24) & 0xff)==3) { // zmena barvy tretiho vertexu
thirdColor[0]=((command >> 16) & 0xff)/255.0;
thirdColor[1]=((command >> 8) & 0xff)/255.0;
thirdColor[2]=(command & 0xff)/255.0;
}
glutPostRedisplay(); // prekresleni okna
}
//---------------------------------------------------------------------
// Tato funkce je zavolana pri vyberu polozky z druheho menu
//---------------------------------------------------------------------
void onSecondMenuCommand(int command)
{
switch (command) {
case Quit:
exit(0); // pri vyberu prikazu Quit ukoncime aplikace
break;
case FullScreen: // prikaz pro prepnuti na celou obrazovku
glutFullScreen();
break;
case Window: // prikaz pro prepnuti zpatky do okna
glutReshapeWindow(400, 400);
glutPositionWindow(50, 50);
break;
default:
break;
}
}
//---------------------------------------------------------------------
// Tato funkce vytvori menu a navaze ho na leve tlacitko mysi
//---------------------------------------------------------------------
void createMenu(void)
{
int i, j, k;
i=glutCreateMenu(onFirstMenuCommand); // vytvoreni prvniho submenu
glutAddMenuEntry("Black", BlackColor | (1<<24));// pridani polozek do submenu
glutAddMenuEntry("Gray", GrayColor | (1<<24));
glutAddMenuEntry("Red", RedColor | (1<<24));
glutAddMenuEntry("Green", GreenColor | (1<<24));
glutAddMenuEntry("Blue", BlueColor | (1<<24));
glutAddMenuEntry("White", WhiteColor | (1<<24));
j=glutCreateMenu(onFirstMenuCommand); // vytvoreni druheho submenu
glutAddMenuEntry("Black", BlackColor | (2<<24));// pridani polozek do submenu
glutAddMenuEntry("Gray", GrayColor | (2<<24));
glutAddMenuEntry("Red", RedColor | (2<<24));
glutAddMenuEntry("Green", GreenColor | (2<<24));
glutAddMenuEntry("Blue", BlueColor | (2<<24));
glutAddMenuEntry("White", WhiteColor | (2<<24));
k=glutCreateMenu(onFirstMenuCommand); // vytvoreni tretiho submenu
glutAddMenuEntry("Black", BlackColor | (3<<24));// pridani polozek do submenu
glutAddMenuEntry("Gray", GrayColor | (3<<24));
glutAddMenuEntry("Red", RedColor | (3<<24));
glutAddMenuEntry("Green", GreenColor | (3<<24));
glutAddMenuEntry("Blue", BlueColor | (3<<24));
glutAddMenuEntry("White", WhiteColor | (3<<24));
glutCreateMenu(onFirstMenuCommand); // vytvoreni kaskadoveho menu
glutAddSubMenu("First vertex", i); // pridani vsech submenu
glutAddSubMenu("Second vertex", j);
glutAddSubMenu("Third vertex", k);
glutAttachMenu(GLUT_LEFT_BUTTON);
i=glutCreateMenu(onSecondMenuCommand); // vytvoreni prvniho submenu
glutAddMenuEntry("Yes", Quit); // pridani polozek do submenu
glutAddMenuEntry("No", NoQuit);
glutCreateMenu(onSecondMenuCommand); // vytvoreni kaskadoveho menu
glutAddMenuEntry("Full screen", FullScreen);
glutAddMenuEntry("Window", Window);
glutAddSubMenu("Quit", i); // pridani submenu
glutAttachMenu(GLUT_RIGHT_BUTTON);
}
//---------------------------------------------------------------------
// Hlavni funkce konzolove aplikace
//---------------------------------------------------------------------
int main(int argc, char **argv)
{
glutInit(&argc, argv); // inicializace knihovny GLUT
glutCreateWindow("Priklad cislo 13");// vytvoreni okna pro kresleni
glutReshapeWindow(400, 400); // nastaveni velikosti okna
glutDisplayFunc(onDisplay); // registrace funkce volane pri prekreslovani okna
glutReshapeFunc(onResize); // registrace funkce volane pri zmene velikosti okna
glutKeyboardFunc(onKeyboard); // registrace funkce volani pri stlaceni ASCII klavesy
createMenu(); // vytvoreni menu a registrace callback funkce
glutMainLoop(); // nekonecna smycka, kde se volaji zaregistrovane fce
return 0; // navratova hodnota vracena operacnimu systemu
}
//---------------------------------------------------------------------
// Konec zdrojoveho souboru
//---------------------------------------------------------------------