Programming and Graphics

220 Introduction to C++ Programming and Graphics

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

plot2dsimple

plot a line

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

#include<cmath>

#include "VOGLE/voglec++.h"

#include "drawmarker2d.h"

#include "drawline2d.h"

using namespace std;

int main()

{

//--- Define the data :

const int n=512;

float xd[n], yd[n];

for (int i=0; i<n; i++)

{

xd[i]=-0.3+4.0*(i-1.0)/n;

yd[i]=0.5+0.3*sin(35.0*xd[i])*exp(xd[i]);

}

//--- Set plotting limits:

float xmin=0.0; float xmax=1.0;

float ymin=0.0; float ymax=1.0;

// Set plotting margins:

float xmarg = 0.2*(xmax-xmin);

float ymarg = 0.2*(ymax-ymin);

//--- Launch the graphics:

prefposition (500,100);

prefsize (500,500);

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

vinit(device);

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

color (YELLOW); // yellow background

clear();

//--- Draw markers at the data points: