{-----------------------------------------------
�� ����� ImageProperties.xml
------------------------------------------------}
const
	m_nWidth = 76800;
	m_nHeight = 51200;

var
	i, zoom, nMaxZoom, nTileGroup :Longint;

{-----------------------------------------------
��������� floor �������
------------------------------------------------}
function Floor(v :Extended) :Extended;
begin
	Result := Trunc(v);
	if v < Result then Result := Result - 1.0;
end;

{-----------------------------------------------
��������� ceil �������
------------------------------------------------}
function Ceil(v :Extended) :Extended;
begin
	Result := Trunc(v);
	if v > Result then Result := Result + 1.0;
end;

{-----------------------------------------------
�������� ���������� ���������� Zoom'�
------------------------------------------------}
procedure GetMaxZoom();
var k, i :Longint;
begin
	k := m_nWidth;
	if m_nHeight > m_nWidth then k := m_nHeight;

	i := 0;
	while k > 256 do
	begin
		k := Trunc(k / 2);
		Inc(i);
	end;
	nMaxZoom := i;
end;

{-----------------------------------------------
�������� ��������� ������ �� ������ Zoom'�
------------------------------------------------}
function GetTilesAtZoom(zoom: Longint) :Longint;
var k :Extended;
begin
	k := 256.0 * IntPower(2, nMaxZoom - zoom);
	Result := Trunc(Ceil(m_nWidth / k) * Ceil(m_nHeight / k));
end;

{-----------------------------------------------
��������� ������ ���������� ������� Zoom'�
------------------------------------------------}
function GetTilesCount(nZoom: Longint) :Longint;
var i: Longint;
begin
	Result := 0;
	for i := 0 to nZoom - 1 do Result := Result + GetTilesAtZoom(i);
end;


{-----------------------------------------------
�������� URL �����
------------------------------------------------}
begin
	zoom := GetZ - 1;
	GetMaxZoom();
	nTileGroup :=  (GetX + GetY * Trunc(Ceil(m_nWidth / (256.0 * IntPower(2, nMaxZoom - zoom)))) + GetTilesCount(zoom)) div 256;
	ResultURL := GetURLBase + IntToStr(nTileGroup) + '/' + IntToStr(zoom) + '-' + IntToStr(GetX) + '-' + IntToStr(GetY) + '.jpg';
{	RequestHead := 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' + #13#10; }
end.