private void Set(int index, float x, float y, float width, float height, Color color)
{
float fx2 = x + width;
float fy2 = y + height;
_vertices[index + 0].Position = new Vector3(x, y, 0);
_vertices[index + 0].Color = color;
_vertices[index + 1].Position = new Vector3(x, fy2, 0);
_vertices[index + 1].Color = color;
_vertices[index + 2].Position = new Vector3(fx2, fy2, 0);
_vertices[index + 2].Color = color;
_vertices[index + 3].Position = new Vector3(fx2, y, 0);
_vertices[index + 3].Color = color;
}