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TAChart: Extract TBasicPo.FindExtentInterval procedure

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+ Minor refactoring.

git-svn-id: trunk@40053 -
This commit is contained in:
ask 2013-01-30 13:22:13 +00:00
parent e755978110
commit 017e658f9c
1 changed files with 33 additions and 24 deletions
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57
components/tachart/tacustomseries.pas
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@ -89,7 +89,7 @@ type
function TitleIsStored: Boolean; virtual;
public
function AxisToGraph(const APoint: TDoublePoint): TDoublePoint;
function AxisToGraph(const APoint: TDoublePoint): TDoublePoint; inline;
function AxisToGraphX(AX: Double): Double; override;
function AxisToGraphY(AY: Double): Double; override;
function GetAxisX: TChartAxis;
@ -242,26 +242,28 @@ type
FUpBound: Integer;
FUseReticule: Boolean;
strict protected
procedure DrawLabels(ADrawer: IChartDrawer);
function GetLabelDataPoint(AIndex: Integer): TDoublePoint; virtual;
procedure UpdateGraphPoints(AIndex: Integer); overload; inline;
procedure UpdateGraphPoints(AIndex, ALo, AUp: Integer); overload;
protected
procedure AfterAdd; override;
procedure AfterDrawPointer(
ADrawer: IChartDrawer; AIndex: Integer; const APos: TPoint); virtual;
procedure DrawLabels(ADrawer: IChartDrawer);
procedure DrawPointers(ADrawer: IChartDrawer);
procedure FindExtentInterval(
const AExtent: TDoubleRect; AFilterByExtent: Boolean);
function GetLabelDataPoint(AIndex: Integer): TDoublePoint; virtual;
procedure GetLegendItemsRect(AItems: TChartLegendItems; ABrush: TBrush);
function GetXRange(AX: Double; AIndex: Integer): Double;
function GetZeroLevel: Double; virtual;
function NearestXNumber(var AIndex: Integer; ADir: Integer): Double;
procedure PrepareGraphPoints(
const AExtent: TDoubleRect; AFilterByExtent: Boolean);
procedure UpdateMargins(ADrawer: IChartDrawer; var AMargins: TRect); override;
procedure UpdateGraphPoints(AIndex: Integer); overload; inline;
procedure UpdateGraphPoints(AIndex, ALo, AUp: Integer); overload;
procedure UpdateMinXRange;
property Pointer: TSeriesPointer read FPointer write SetPointer;
protected
procedure AfterAdd; override;
procedure UpdateMargins(ADrawer: IChartDrawer; var AMargins: TRect); override;
public
destructor Destroy; override;
public
@ -993,6 +995,27 @@ begin
end;
end;
// Find an interval of x-values intersecting the extent.
// Requires monotonic (but not necessarily increasing) axis transformation.
procedure TBasicPointSeries.FindExtentInterval(
const AExtent: TDoubleRect; AFilterByExtent: Boolean);
var
axisExtent: TDoubleInterval;
begin
FLoBound := 0;
FUpBound := Count - 1;
if AFilterByExtent then begin
with AExtent do
if IsRotated then
axisExtent := DoubleInterval(GraphToAxisY(a.Y), GraphToAxisY(b.Y))
else
axisExtent := DoubleInterval(GraphToAxisX(a.X), GraphToAxisX(b.X));
Source.FindBounds(axisExtent.FStart, axisExtent.FEnd, FLoBound, FUpBound);
FLoBound := Max(FLoBound - 1, 0);
FUpBound := Min(FUpBound + 1, Count - 1);
end;
end;
function TBasicPointSeries.GetLabelDataPoint(AIndex: Integer): TDoublePoint;
begin
Result := GetGraphPoint(AIndex);
@ -1129,23 +1152,9 @@ end;
procedure TBasicPointSeries.PrepareGraphPoints(
const AExtent: TDoubleRect; AFilterByExtent: Boolean);
var
axisExtent: TDoubleInterval;
i: Integer;
begin
// Find an interval of x-values intersecting the extent.
// Requires monotonic (but not necessarily increasing) axis transformation.
FLoBound := 0;
FUpBound := Count - 1;
if AFilterByExtent then begin
with AExtent do
if IsRotated then
axisExtent := DoubleInterval(GraphToAxisY(a.Y), GraphToAxisY(b.Y))
else
axisExtent := DoubleInterval(GraphToAxisX(a.X), GraphToAxisX(b.X));
Source.FindBounds(axisExtent.FStart, axisExtent.FEnd, FLoBound, FUpBound);
FLoBound := Max(FLoBound - 1, 0);
FUpBound := Min(FUpBound + 1, Count - 1);
end;
FindExtentInterval(AExtent, AFilterByExtent);
SetLength(FGraphPoints, FUpBound - FLoBound + 1);
if (AxisIndexX < 0) and (AxisIndexY < 0) then