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TAChart: Refactor TCalculatedChartSource.ExtractItem/GetOriginItem

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git-svn-id: trunk@32398 -
This commit is contained in:
ask 2011-09-18 11:07:28 +00:00
parent 0ed375aea1
commit 3b18b3adee
1 changed files with 28 additions and 29 deletions
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57
components/tachart/tasources.pas
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@ -182,7 +182,7 @@ type
procedure CalcPercentage;
procedure Changed(ASender: TObject);
function EffectiveAccumulationRange: Cardinal;
procedure ExtractItem(out AItem: TChartDataItem; AIndex: Integer);
procedure ExtractItem(AIndex: Integer);
procedure RangeAround(AIndex: Integer; out ALeft, ARight: Integer);
procedure SetAccumulationDirection(AValue: TChartAccumulationDirection);
procedure SetAccumulationMethod(AValue: TChartAccumulationMethod);
@ -864,6 +864,17 @@ end;
{ TCalculatedChartSource }
procedure TCalculatedChartSource.CalcAccumulation(AIndex: Integer);
var
lastItemIndex: Integer = -1;
function GetOriginItem(AItemIndex: Integer): PChartDataItem;
begin
Result := @FItem;
if lastItemIndex = AItemIndex then exit;
ExtractItem(AItemIndex);
lastItemIndex := AItemIndex;
end;
var
i, oldLeft, oldRight, newLeft, newRight: Integer;
begin
@ -878,39 +889,28 @@ begin
(Abs(oldRight - newRight) > 1)
then begin
FHistory.Clear;
for i := newLeft to newRight do begin
ExtractItem(FItem, i);
FHistory.AddLast(FItem);
end;
for i := newLeft to newRight do
FHistory.AddLast(GetOriginItem(i)^);
end
else begin
if FHistory.Capacity = 0 then
for i := oldLeft to newLeft - 1 do begin
ExtractItem(FItem, i);
FHistory.RemoveValue(FItem);
end
for i := oldLeft to newLeft - 1 do
FHistory.RemoveValue(GetOriginItem(i)^)
else
for i := oldLeft to newLeft - 1 do
FHistory.RemoveFirst;
if FHistory.Capacity = 0 then
for i := oldRight downto newRight + 1 do begin
ExtractItem(FItem, i);
FHistory.RemoveValue(FItem);
end
for i := oldRight downto newRight + 1 do
FHistory.RemoveValue(GetOriginItem(i)^)
else
for i := oldRight downto newRight + 1 do
FHistory.RemoveLast;
for i := oldLeft - 1 downto newLeft do begin
ExtractItem(FItem, i);
FHistory.AddFirst(FItem);
for i := oldLeft - 1 downto newLeft do
FHistory.AddFirst(GetOriginItem(i)^);
for i := oldRight + 1 to newRight do
FHistory.AddLast(GetOriginItem(i)^);
end;
for i := oldRight + 1 to newRight do begin
ExtractItem(FItem, i);
FHistory.AddLast(FItem);
end;
end;
if (AIndex <> newLeft) and (AIndex <> newRight) then
ExtractItem(FItem, AIndex);
GetOriginItem(AIndex);
case AccumulationMethod of
camSum:
FHistory.GetSum(FItem);
@ -1010,17 +1010,16 @@ begin
Result := AccumulationRange;
end;
procedure TCalculatedChartSource.ExtractItem(
out AItem: TChartDataItem; AIndex: Integer);
procedure TCalculatedChartSource.ExtractItem(AIndex: Integer);
var
t: TDoubleDynArray;
i: Integer;
begin
AItem := Origin[AIndex]^;
FItem := Origin[AIndex]^;
SetLength(t, Length(FYOrder));
for i := 0 to High(FYOrder) do
t[i] := AItem.YList[FYOrder[i]];
AItem.YList := t;
t[i] := FItem.YList[FYOrder[i]];
FItem.YList := t;
end;
function TCalculatedChartSource.GetCount: Integer;
@ -1037,7 +1036,7 @@ begin
Result := @FItem;
if FIndex = AIndex then exit;
if (AccumulationMethod = camNone) or (AccumulationRange = 1) then
ExtractItem(FItem, AIndex)
ExtractItem(AIndex)
else
CalcAccumulation(AIndex);
CalcPercentage;