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TAChart: Add helper methods ZoomPercent and UndoZoom to TAChartTeeChart for improved Delphi compatibility.

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git-svn-id: trunk@60056 -
This commit is contained in:
wp 2019-01-11 11:17:53 +00:00
parent 4bb9801bf9
commit 7226642cf1
1 changed files with 22 additions and 1 deletions
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23
components/tachart/tachartteechart.pas
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@ -28,6 +28,8 @@ type
function GetMargin(AIndex: Integer): Integer; inline; function GetMargin(AIndex: Integer): Integer; inline;
procedure SetMargin(AIndex: Integer; AValue: TChartDistance); inline; procedure SetMargin(AIndex: Integer; AValue: TChartDistance); inline;
public public
procedure UndoZoom;
procedure ZoomPercent(const PercentZoom: Double);
property RightAxis: TChartAxis index calRight read GetAxisByAlign1; property RightAxis: TChartAxis index calRight read GetAxisByAlign1;
property TopAxis: TChartAxis index calTop read GetAxisByAlign1; property TopAxis: TChartAxis index calTop read GetAxisByAlign1;
public public
@ -80,7 +82,7 @@ type
implementation implementation
uses uses
Math; Math, TAGeometry;
type type
TLogTransformEnumerator = class(TAxisTransformEnumerator) TLogTransformEnumerator = class(TAxisTransformEnumerator)
@ -198,6 +200,25 @@ begin
Margins.SetValue(AIndex, AValue); Margins.SetValue(AIndex, AValue);
end; end;
procedure TChartTeeChart.UndoZoom;
begin
ZoomFull;
end;
procedure TChartTeeChart.ZoomPercent(const PercentZoom: Double);
var
ext: TDoubleRect;
factor: Double;
dx, dy: Double;
begin
if PercentZoom <= 0 then exit;
factor := (1.0 - PercentZoom * 0.01) * 0.5;
ext := LogicalExtent;
dx := (ext.b.x - ext.a.x) * factor;
dy := (ext.b.y - ext.a.y) * factor;
LogicalExtent := DoubleRect(ext.a.x - dx, ext.a.y - dy, ext.b.x + dx, ext.b.y + dy);
end;
procedure Dummy; procedure Dummy;
begin begin
// Workaround for issue #21808. // Workaround for issue #21808.