/**
 * Draw a circle.
 * @author Dark_Link
 * @param x Specifies the x-coordinate of the circle.
 * @param y Specifies the y-coordinate of the circle.
 * @param radius The radius of the circle.
 * @param color The color of the circle in RGBA format.
 * @param filled Set to true to fill the circle.
 */
void  GRRLIB_Circle (const f32 x,  const f32 y,  const f32 radius,
                     const u32 color, const u8 filled) {
    GRRLIB_Ellipse (x, y, radius, radius,color, filled);
}

/**
 * Draw an ellipse.
 * @author Dark_Link (edited by elisherer)
 * @param x Specifies the x-coordinate of the circle.
 * @param y Specifies the y-coordinate of the circle.
 * @param radiusx The x radius of the circle.
 * @param radiusy The y radius of the circle.
 * @param color The color of the circle in RGBA format.
 * @param filled Set to true to fill the circle.
 */

void  GRRLIB_Ellipse (const f32 x,  const f32 y,  const f32 radiusx, const f32 radiusy,
                     const u32 color, const u8 filled) {
    guVector v[36];
    u32 ncolor[36];
    u32 a;
    f32 ra;
    f32 G_DTOR = M_DTOR * 10;

    for (a = 0; a < 36; a++) {
        ra = a * G_DTOR;

        v[a].x = cos(ra) * radiusx + x;
        v[a].y = sin(ra) * radiusy + y;
        v[a].z = 0.0f;
        ncolor[a] = color;
    }

    if (!filled)  GRRLIB_GXEngine(v, ncolor, 36, GX_LINESTRIP  ) ;
    else          GRRLIB_GXEngine(v, ncolor, 36, GX_TRIANGLEFAN) ;
}