linerel

Syntax

#include <graphics.h>
void linerel(int dx, int dy);

Description

linerel draws a line from the CP (current position) to a point that is a relative distance (dx,dy) from the CP. The CP is advanced by (dx,dy).

Return Value

None.

See also

getlinesettings

line

lineto

setcolor

setlinestyle

setwritemode

Example

/* linerel example */ 

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>

int main(void)
{
   /* request autodetection */
   int gdriver = DETECT, gmode, errorcode;
   char msg[80];

   /* initialize graphics and local variables */
   initgraph(&gdriver, &gmode, "");

   /* read result of initialization */
   errorcode = graphresult();
   if (errorcode != grOk) {
      printf("Graphics error: %s\n", grapherrormsg(errorcode));
      printf("Press any key to halt:");

      getch();
      exit(1);
   }

   /* move the CP to location (20,30) */
   moveto(20,30);

   /* create and output a message at (20,30) */
   sprintf(msg, " (%d, %d)", getx(), gety());
   outtextxy(20,30, msg);

   /* draw line to a point a relative distance away from current CP */
   linerel(100, 100);

   /* create and output a message at CP */
   sprintf(msg, " (%d, %d)", getx(), gety());
   outtext(msg);

   /* clean up */
   getch();
   closegraph();

   return 0;
}