Programming and Graphics

242 Introduction to C++ Programming and Graphics

angx = angxinit;

angy = angyinit;

zoom = zoominit;

color (bgc);

clear ();

drawplot3d();

}

//--- If ’p’ is pressed, print in a file:

if(kbd==’p’)

{

char outfile[1];

cout << " Please enter the name of the postscript file " <<endl;

cin >> outfile;

cout << "Please enter:" << endl << endl;

cout <<" 1 for a black/white plot" << endl;

cout <<" 2 for a black/white plot in portrait" << endl;

cout <<" 3 for a color plot" << endl;

cout <<" 4 for a color plot with background color" << endl;

cout <<" 5 for a color plot in portrait" << endl;

cout <<" 6 for a color plot in portrait with background color" << endl;

short Iplot;

cin >> Iplot;

voutput (outfile);

if(Iplot==1) vnewdev("postscript");

if(Iplot==2) vnewdev("ppostscript");

if(Iplot==3) vnewdev("cps");

if(Iplot==4) vnewdev("cps");

if(Iplot==5) vnewdev("pcps");

if(Iplot==6) vnewdev("pcps");

drawplot3d(); // print in file

vnewdev ("X11"); // redraw on the screen

color (bgc);

clear ();

drawplot3d();

//--- Interactive:

cout << "Press q to quit" << endl;

cout <<"ptoprint a postscript file" << endl;

cout <<"rtoreset" << endl;

cout << "Place cursor at the center of the graphics window" << endl;

cout << "and then click and move the:" << endl;

cout << " left-mouse button to rotate left-right" << endl;