CS 450: COMPUTER GRAPHICS

REVIEW: GLUT INPUT FUNCTIONS

SPRING 2015

DR. MICHAEL J. REALE

MOUSE COORDINATES: UP IS DOWN

• All mouse coordinates in GLUT are in SCREEN COORDINATES with Y INVERTED (so up is down)

• Relative to TOP-LEFT window corner!

• If storing, do something like this:

• currentYMouse = windowHeight – yMouse;

MOUSE

• glutMouseFunc();

• Mouse button is FIRST PRESSED or RELEASED

• Mouse click = two events (a press and release)

• glutMotionFunc();

• Mouse MOVING and ANY mouse button is down

• glutPassiveMotionFunc();

• Mouse MOVING and NO mouse buttons are down

KEYBOARD

• glutKeyboardFunc()

• Regular keys (ASCII code)

• When the user PRESSES a key continues calling as long as key is down

• glutSpecialFunc(specialKeyboard)

• Special keys (F1, arrow keys, etc.) uses GLUT constants

POPUP MENUS

• GLuint menuID = glutCreateMenu(menuFunction)

• void menuFunction(GLint menuItemNumber)

• Called when a menu item is clicked on

• GLint menuItemNumber = index of menu item

• In function, decide what to do for each menu item

• glutAddMenuEntry(charString, menuItemNumber)

• Add menu item string with item number

• glutAttachMenu(button)

• Determine which mouse button opens menu

• glutAddSubMenu(submenu)

• Add another menu as submenu of current menu