DESSINER UNE FONCTION EN MODE CONSOLE AVEC WINBGIM.H (DEV-C++)

#include <winbgim.h>
#include <conio.h>


#define MAXX 640
#define MAXY 480

/* prototypes et declarations */
float screen_y(float, float, float);
float screen_y(float, float, float);

float screen_x(float xb, float x, float xe)
{
	return ((x-xb)/(xe-xb)*MAXX);
}

float screen_y(float yb, float y, float ye)
{
	return (MAXY-(y-yb)/(ye-yb)*MAXY);
}

void main(void)
{
	
	int drv=VGA, mode=VGAHI;
	float a,b,c,xb,xe,yb,ye,x,y;

	
	a=1;
	b=0;
	c=0;
	xb=-10;
	xe=10;
	yb=-10;
	ye=150;
	

	initgraph(&drv,&mode,"");

	/* Dessine les axes x et y */
	setcolor(4);
	line(0,screen_y(yb,0,ye),MAXX,screen_y(yb,0,ye));
	line(screen_x(xb,0,xe),0,screen_x(xb,0,xe),MAXY);

	setcolor(15);
	moveto(0,screen_y(yb,a*xb*xb+b*xb+c,ye));
	for(x=xb;x<=xe;x+=(xe-xb)/MAXX)
	{
		y=a*x*x+b*x+c;
		lineto(screen_x(xb,x,xe),screen_y(yb,y,ye));
	}
	getch();
	closegraph();
	return(0);
}