Programming and Graphics

208 Introduction to C++ Programming and Graphics

/*---------------------------------

Animation of a rotating polygon

using VOGLE

---------------------------------*/

#include<iostream>

#include<cmath>

#include "VOGLE/voglec++.h"

using namespace std;

int main()

{

//--- Window plotting limits:

float xmin=0.0; float xmax=1.0; // plotting limits

float ymin=0.0; float ymax=1.0;

float xmarg = 0.2*(xmax-xmin); // plotting margins

float ymarg = 0.2*(ymax-ymin);

//--- Polygon variables:

const intn=5;//number of vertices

float points[n][2]; // plotting array

float omega = 0.1; // angular velocity

float t=0; // time

float Dt = 0.01; // time step

float xcrot = 0.5; // rotation center

float ycrot = 0.5; // rotation center

//--- Initial polygon vertices:

float x[n] ={0.80, 0.90, 0.90, 0.80, 0.80};

float y[n] ={0.50, 0.50, 0.88, 0.88, 0.50};

//--- Prepare the graphics:

prefposition (500,100); // window position

prefsize (300, 300); // window size

char device[]="X11"; // initialize on the screen

vinit(device);

//--- Define the plotting units

ortho2 (xmin-xmarg, xmax+xmarg, ymin-ymarg, ymax+ymarg);

//--- Polygon plotting option:

bool fill = true; // fill the polygon

polyfill (fill);