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unit TAChartExtentLink;
{$H+}
interface
uses
Classes, TAChartUtils, TAGraph;
type
TLinkedChart = class(TCollectionItem)
strict private
FChart: TChart;
FListener: TListener;
procedure OnExtentChanged(ASender: TObject);
procedure SetChart(AValue: TChart);
protected
function GetDisplayName: String; override;
public
constructor Create(ACollection: TCollection); override;
destructor Destroy; override;
published
property Chart: TChart read FChart write SetChart;
end;
TLinkedCharts = class(TCollection)
strict private
FOwner: TComponent;
protected
function GetOwner: TPersistent; override;
public
constructor Create(AOwner: TComponent);
function Add: TLinkedChart; // Should be inline, but FPC 2.6 miscompiles it.
end;
TChartExtendLinkMode = (elmXY, elmOnlyX, elmOnlyY);
TChartExtentLink = class(TComponent)
strict private
FEnabled: Boolean;
FLinkedCharts: TLinkedCharts;
FMode: TChartExtendLinkMode;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure AddChart(AChart: TChart);
procedure SyncWith(AChart: TChart);
published
property Enabled: Boolean read FEnabled write FEnabled default true;
property LinkedCharts: TLinkedCharts read FLinkedCharts write FLinkedCharts;
property Mode: TChartExtendLinkMode read FMode write FMode default elmXY;
end;
procedure Register;
implementation
uses
SysUtils, TAGeometry;
procedure Register;
begin
RegisterComponents(CHART_COMPONENT_IDE_PAGE, [TChartExtentLink]);
end;
{ TLinkedCharts }
function TLinkedCharts.Add: TLinkedChart;
begin
Result := TLinkedChart(inherited Add);
end;
constructor TLinkedCharts.Create(AOwner: TComponent);
begin
inherited Create(TLinkedChart);
FOwner := AOwner;
end;
function TLinkedCharts.GetOwner: TPersistent;
begin
Result := FOwner;
end;
{ TLinkedChart }
constructor TLinkedChart.Create(ACollection: TCollection);
begin
inherited Create(ACollection);
FListener := TListener.Create(@FChart, @OnExtentChanged);
end;
destructor TLinkedChart.Destroy;
begin
FreeAndNil(FListener);
inherited;
end;
function TLinkedChart.GetDisplayName: String;
begin
Result := inherited GetDisplayName;
if Chart <> nil then
Result += ' -> ' + Chart.Name;
end;
procedure TLinkedChart.OnExtentChanged(ASender: TObject);
begin
Unused(ASender);
(Collection.Owner as TChartExtentLink).SyncWith(Chart);
end;
procedure TLinkedChart.SetChart(AValue: TChart);
begin
if FChart = AValue then exit;
if Chart <> nil then
Chart.ExtentBroadcaster.Unsubscribe(FListener);
FChart := AValue;
if Chart <> nil then
Chart.ExtentBroadcaster.Subscribe(FListener);
end;
{ TChartExtentLink }
procedure TChartExtentLink.AddChart(AChart: TChart);
var
i: TCollectionItem;
begin
for i in LinkedCharts do
if TLinkedChart(i).Chart = AChart then exit;
LinkedCharts.Add.Chart := AChart;
end;
constructor TChartExtentLink.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FEnabled := true;
FLinkedCharts := TLinkedCharts.Create(Self);
end;
destructor TChartExtentLink.Destroy;
begin
FreeAndNil(FLinkedCharts);
inherited;
end;
procedure TChartExtentLink.SyncWith(AChart: TChart);
function CombineXY(const AX, AY: TDoubleRect): TDoubleRect;
begin
Result.a := DoublePoint(AX.a.X, AY.a.Y);
Result.b := DoublePoint(AX.b.X, AY.b.Y);
end;
var
c: TCollectionItem;
ch: TChart;
begin
if not FEnabled or (AChart = nil) then exit;
for c in LinkedCharts do begin
ch := TLinkedChart(c).Chart;
// Do not sync if the chart was never drawn yet.
if (ch = nil) or (ch.LogicalExtent = EmptyExtent) then continue;
// ZoomFull is lazy by default, so full extent may be not recalculated yet.
if not ch.IsZoomed and (ch <> AChart) then
ch.LogicalExtent := ch.GetFullExtent;
// An event loop will be broken since setting LogicalExtent to
// the same value does not initiale the extent broadcast.
case Mode of
elmXY:
ch.LogicalExtent := AChart.LogicalExtent;
elmOnlyX:
ch.LogicalExtent := CombineXY(AChart.LogicalExtent, ch.LogicalExtent);
elmOnlyY:
ch.LogicalExtent := CombineXY(ch.LogicalExtent, AChart.LogicalExtent);
end;
end;
end;
end.
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