Programming and Graphics

268 Introduction to C++ Programming and Graphics

8.1.3. Write aGlutfunction that displays a four-sided pyramid.

8.1.4. Write a code that displays a bicycle.

8.1.5. Write a code that displays two lines of text.

8.1.6. Write a code that generates a spectacular color display of your choice.

8.2 Graphicsevents............................

Once the main loop has been entered,Glutkeeps track of thex−yposition
of the cursor on the screen, the mouse buttons, and the keyboard keys. When
the window has been selectedand a key or a mouse button is pressed, an event
is registered.

Monitoring the keyboard

Consider the following slight variation of the teapot preamble and main
code:

#include<iostream>

#include<freeglut.h>

using namespace std;

void showme(void);

void quit(unsigned char, int, int);

int win;

int main(int argc, char **argv)

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUTDEPTH|GLUTSINGLE|GLUTRGBA);

glutInitWindowPosition(100,100);

glutInitWindowSize(620,620);

win=glutCreateWindow("Teapot");

glutDisplayFunc(disp);

glutKeyboardFunc(quit);

glClearColor(0.2,0.5,0.2,0.2);

glutMainLoop();

return 0;

}

The integer “win” is the window identification number defined in the main code.
The user-defined functionquitreads: