#include <stdlib.h>
#include <math.h>
#include <conio.h>
#include <graphics.h>
void main()
{
  struct point { int x,y; } p1, pbe;
  int lon,sho,Drive, Mode;
  float i, tx, ty, x, y, min, max;
  int j, wl, x1, y1;

  printf("give me the original point --> "); scanf("%d %d",&p1.x,&p1.y);

  printf("input the range min max --> "); scanf("%f %f",&min,&max);

  printf("give me the wave length --> "); scanf("%d",&wl);

  Drive=DETECT; initgraph(&Drive, &Mode, ""); setcolor(14);

  line(p1.x,0, p1.x,479); line(0,p1.y,639,p1.y); /* coordinate line */

  for (j=0,i=min; i<=max; i+=0.05) {

    x=p1.x+i*wl; y=p1.y+wl*sin(i); x1=(int)x; y1=(int)y;

    if ((x1 >= 0) && (x1 <= 639) && (y1 >= 0) && (y1 <= 479)) {
      if (j == 0) { moveto(x1,y1); j=1; }
      else lineto(x1,y1);
      delay(300);
    }
  }
  getche(); closegraph();
}