OpenGL編程輕松入門之菜單管理.doc

OpenGL編程輕松入門之菜單管理2006-05-23 08:55作者：黃燕出處：天極開發(fā)責(zé)任編輯：方舟菜單是我們經(jīng)常使用的工具，很方便，直觀。本節(jié)討論在OpenGL中如何進(jìn)行菜單管理。例17：本例在藍(lán)色的背景上繪制一個(gè)白色的正方形，在窗口內(nèi)單擊鼠標(biāo)右鍵，彈出菜單，當(dāng)選擇不同菜單項(xiàng)時(shí)命令窗口會(huì)顯示出是哪個(gè)菜單的哪個(gè)菜單相被激活。本例一個(gè)主菜單，主菜單有3個(gè)菜單條目及兩個(gè)子菜單。兩個(gè)子菜單都有3個(gè)菜單條目。#include #include int menu,subMenu1,subMenu2;/*在藍(lán)色的背景上繪制一個(gè)白色的正方形*/void myDraw(void)glClearColor(0.0,0.0,1.0,0.0);glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);glColor3f(1.0,1.0,1.0);glOrtho(-1.0,1.0,-1.0,1.0,-1.0,1.0);glBegin(GL_POLYGON);glVertex2f(-0.5,-0.5);glVertex2f(-0.5,0.5);glVertex2f(0.5,0.5);glVertex2f(0.5,-0.5);glEnd();glutSwapBuffers();/*寫出當(dāng)前是哪個(gè)菜單*/void GetCurrentMenu(void)int nMenu;nMenu = glutGetMenu();if(nMenu = menu)printf(The current menu is Main Menu.n);if(nMenu = subMenu1)printf(The current menu is SubMenu1.n);if(nMenu = subMenu2)printf(The current menu is SubMenu2.n);/*子菜單1*/void SubMenuFunc1(int data)GetCurrentMenu();switch(data)case 1:printf(SubMenu1s item 1 is triggered.n);break;case 2:printf(SubMenu1s item 2 is triggered.n);break;case 3:printf(SubMenu1s item 3 is triggered.n);break;/*子菜單2*/void SubMenuFunc2(int data)GetCurrentMenu();switch(data)case 1:printf(SubMenu2s item 1 is triggered.n);break;case 2:printf(SubMenu2s item 2 is triggered.n);break;case 3:printf(SubMenu2s item 3 is triggered.n);break;/*主菜單*/void MenuFunc(int data)GetCurrentMenu();switch(data)case 1:printf(MainMenus item 1 is triggered.n);break;case 2:printf(MainMenus item 2 is triggered.n);break;case 3:printf(MainMenus item 3 is triggered.n);break;int main(int argc,char * argv)/*初始化*/glutInit(&argc,argv);glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH);glutInitWindowSize(500,400);glutInitWindowPosition(100,100);/*創(chuàng)建窗口*/glutCreateWindow( MENU);glutDisplayFunc(myDraw);/*創(chuàng)建子菜單1并加入菜單條目*/subMenu1 = glutCreateMenu(SubMenuFunc1);glutAddMenuEntry(SubMenu1s item1,1);glutAddMenuEntry(SubMenu1s item2,2);glutAddMenuEntry(SubMenu1s item3,3);glutAttachMenu(GLUT_RIGHT_BUTTON);/*創(chuàng)建子菜單2并加入菜單條目*/subMenu2 = glutCreateMenu(SubMenuFunc2);glutAddMenuEntry(SubMenu2s item1,1);glutAddMenuEntry(SubMenu2s item2,2);glutAddMenuEntry(SubMenu2s item3,3);glutAttachMenu(GLUT_RIGHT_BUTTON);/*創(chuàng)建主菜單并加入菜單條目及子菜單*/menu = glutCreateMenu(MenuFunc);glutAddMenuEntry(Item1,1);glutAddMenuEntry(Item2,2);glutAddMenuEntry(Item3,3);glutAddSubMenu(SubMenu 1,subMenu1);glutAddSubMenu(SubMenu 2,subMenu2);glutAttachMenu(GLUT_RIGHT_BUTTON);glutMainLoop();/進(jìn)入GLUT事件處理循環(huán)return 0;int glutCreateMenu（void（*func）（int value）創(chuàng)建一個(gè)新的彈出式菜單并返回一個(gè)唯一標(biāo)識(shí)此菜單的整型表示符。func指明此菜單的功能。int glutAddMenuEntry（char *name，int value）在當(dāng)前菜單底部增加一個(gè)菜單條目。name指定顯示在新菜單條目上的ASCII碼字符串。value指定當(dāng)選擇該菜單條目時(shí)傳遞到菜單回調(diào)函數(shù)中的數(shù)值。void glutAddSubMenu（char *name，int menu）在當(dāng)前菜單的底部增加一個(gè)子菜單觸發(fā)條目。name指定顯示在新菜單觸發(fā)條目上的ASCII碼字符串。meun當(dāng)選擇該子菜單觸發(fā)條目時(shí)彈出的子菜單的標(biāo)識(shí)符。void glutAttachMenu（int button）把當(dāng)前窗口的一個(gè)鼠標(biāo)按鍵與當(dāng)前菜單的標(biāo)識(shí)符聯(lián)系起來。button指明鼠