用line画直线

[c]代码库

#include "graphics.h"
main()
{
	int driver,mode,i;
	float x0,y0,y1,x1;
	float j=12,k;
	driver=VGA;
	mode=VGAHI;
	initgraph ( &driver,&mode,"" );
	setbkcolor ( GREEN );
	x0=263;
	y0=263;
	y1=275;
	x1=275;
	for ( i=0; i<=18; i++ )
	{
		setcolor ( 5 );
		line ( x0,y0,x0,y1 );
		x0=x0-5;
		y0=y0-5;
		x1=x1+5;
		y1=y1+5;
		j=j+10;
	}
	x0=263;
	y1=275;
	y0=263;
	for ( i=0; i<=20; i++ )
	{
		setcolor ( 5 );
		line ( x0,y0,x0,y1 );
		x0=x0+5;
		y0=y0+5;
		y1=y1-5;
	}
}