Draw ellipse into rectangle in C

Question

The following C code will draw a rectangle. I know how to draw the ellipse, but how can i draw an ellipse into this rectangle?

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

main()
{
   int gd = DETECT, gm;

   initgraph(&gd, &gm, "C:\\TC\\BGI");

   rectangle(100,100,200,200);

   getch();
   closegraph();
   return 0;
}

Do you want an ellipse that is inscribed in the rectangle (i.e. touches the four sides) or one of the infinite set of ellipses that is contained by the rectangle? — twalberg, Nov 26 '12 at 17:30
No eclipse should not touch the sides of rectangle, i need to draw it with a little inset margin :) — TPSstar, Nov 26 '12 at 17:32

score 1 · Accepted Answer · answered Nov 26 '12 at 17:29

1

Asuming you're using the ellipse function from graphics.h, you could do the following:

 int left = 100;
 int right = 200;
 int top = 100;
 int bottom = 200;

 rectangle(left, top, right, bottom);

 int x = (left + right) / 2;  
 int y = (top + bottom) / 2;  
 int start = 0;
 int end = 360;
 int xrad = (right - left) / 2;
 int yrad = (bottom - top) / 2;

 ellipse(x, y, start, end, xrad, yrad);

answered Nov 26 '12 at 17:29

higuaro

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So, there's no rocket science :D i only need to reduce its size to display into the rectangle? – TPSstar Nov 26 '12 at 17:33
Sorry, didn't see the comment until now. Basically, you are inscribing the ellipse into the rectangle, if you need to shrink the ellipse then use shrinked version of `left`, `right`, `top` and `bottom` for the ellipse and the real version for rectangle – higuaro Dec 03 '12 at 18:01

Draw ellipse into rectangle in C

1 Answers1