Programming and Graphics

210 Introduction to C++ Programming and Graphics

(a)(b)

Figure 7.3.1. Snapshot of (a) an animated rotating polygon produced by the code

poly2d,and(b) icosahedron produced by the codelicosa.

{

vexit();

exit(1);

}

t=t+Dt; // update time

goto repeat;

//--- Done

return 0;

}

Figure 7.3.1(a) shows a snapshot of the animation. The code features the
following implementations:

• When the cursor is on the graphics window and the “q” key is pressed,
  the execution terminates.


• When the cursor is on the graphics window and the “s” key is pressed,
  the execution halts and resumes when another key is pressed.

We see that only a handful of simple graphics commands are necessary to
program animation, and this is generally true for most applications. However,