Programming and Graphics

7.5 A graph with axes 227

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

vinit(device);

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

color (WHITE);

clear();

//--- Draw markers:

color (BLACK);

int marker = 3;

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

{

if( xd[i]>xmin && xd[i]<xmax

&& yd[i]>ymin && yd[i]<ymax)

drawmarker2d (xd[i], yd[i], marker

,xmin, xmax,ymin, ymax);

}

//--- Prepare the graph:

color (BLUE);

int Icheck=1;

drawline2d (n,xd,yd,xmin,xmax,ymin,ymax,Icheck);

//--- Draw axes:

drawaxes2d

(xmin,xmax

,ymin,ymax

,ntcx,ntcy

,Ilabelax // 1 to label axes; 0 for no labels

,axc // axis color

,lbc // label color

,labelx // x-axis label

,labely // y-axis label

,title1 // first title

,title2 // second title

,title3 // third title

);

//--- Wait to finish:

char kbd = char(getkey());

return 0;

}