/// <summary>
/// Draws Box2D.
/// </summary>
/// <param name="image">Input image.</param>
/// <param name="box">Box 2D.</param>
/// <param name="color">Object's color.</param>
/// <param name="thickness">Border thickness (-1 to fill the object).</param>
/// <param name="opacity">Sets alpha channel where 0 is transparent and 255 is full opaque.</param>
public unsafe static void Draw(this Bgr <byte>[,] image, Box2D box, Bgr <byte> color, int thickness, byte opacity = Byte.MaxValue)
{
if (thickness < 1)
{
throw new NotSupportedException("Only positive values are valid!");
}
var vertices = box.GetVertices();
draw(image, opacity, cvImg =>
{
for (int i = 0; i < vertices.Length; i++)
{
int idx2 = (i + 1) % vertices.Length;
CvCoreInvoke.cvLine(&cvImg, vertices[i].Round(), vertices[idx2].Round(),
color.ToCvScalar(), thickness,
LineTypes.EightConnected, 0);
}
});
}
