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TAChart: Add initial version of TDataPointDistanceTool. Based on patch by Werner Pamler.

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git-svn-id: trunk@38323 -
This commit is contained in:
ask 2012-08-22 08:18:46 +00:00
parent 676d376f99
commit 7f85da95f6
1 changed files with 200 additions and 2 deletions
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202
components/tachart/tatools.pas
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@ -338,6 +338,22 @@ type
{ TDataPointTool }
TDataPointTool = class(TChartTool)
public
type
TPointRef = class
private
FGraphPos: TDoublePoint;
FIndex: Integer;
FSeries: TBasicChartSeries;
procedure SetGraphPos(const ANewPos: TDoublePoint);
public
procedure Assign(ASource: TPointRef);
property GraphPos: TDoublePoint read FGraphPos;
property Index: Integer read FIndex;
property Series: TBasicChartSeries read FSeries;
end;
strict private
FAffectedSeries: TPublishedIntegerSet;
FDistanceMode: TChartDistanceMode;
@ -484,7 +500,42 @@ type
property Size: Integer read FSize write FSize default -1;
end;
{ TReticuleTool }
TDataPointDistanceTool = class(TDataPointDrawTool)
published
type
TOptions = set of (dpdoLockToData);
strict private
FAnchors: array of TDataPointTool.TPointRef;
FMeasureMode: TChartDistanceMode;
FOptions: TOptions;
function GetPointEnd: TDataPointTool.TPointRef; inline;
procedure SetOptions(AValue: TOptions);
strict protected
procedure DoDraw; override;
function FindRef(APoint: TPoint; ADest: TDataPointTool.TPointRef): Boolean;
function SameTransformations(ASeries1, ASeries2: TBasicChartSeries): Boolean;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure KeyDown(APoint: TPoint); override;
procedure KeyUp(APoint: TPoint); override;
procedure MouseDown(APoint: TPoint); override;
procedure MouseMove(APoint: TPoint); override;
procedure MouseUp(APoint: TPoint); override;
property PointEnd: TDataPointTool.TPointRef read GetPointEnd;
property PointStart: TDataPointTool.TPointRef read FAnchors[0];
published
property DrawingMode;
property GrabRadius default 20;
property LinePen: TChartPen read FPen write SetPen;
property MeasureMode: TChartDistanceMode
read FMeasureMode write FMeasureMode default cdmXY;
property Options: TOptions read FOptions write SetOptions default [];
end;
TReticuleTool = class(TChartTool)
public
@ -502,7 +553,7 @@ implementation
uses
GraphMath, InterfaceBase, Math, SysUtils,
TACustomSeries, TADrawerCanvas, TAEnumerators, TAGeometry, TAMath;
TAChartAxis, TACustomSeries, TADrawerCanvas, TAEnumerators, TAGeometry, TAMath;
function InitBuiltinTools(AChart: TChart): TBasicChartToolset;
var
@ -533,6 +584,24 @@ begin
ToolsClassRegistry.AddObject(ACaption, TObject(AToolClass));
end;
{ TDataPointTool.TPointRef }
procedure TDataPointTool.TPointRef.Assign(ASource: TPointRef);
begin
with ASource do begin
Self.FGraphPos := FGraphPos;
Self.FIndex := FIndex;
Self.FSeries := FSeries;
end;
end;
procedure TDataPointTool.TPointRef.SetGraphPos(const ANewPos: TDoublePoint);
begin
FGraphPos := ANewPos;
FIndex := -1;
FSeries := nil;
end;
{ TChartTool }
procedure TChartTool.Activate;
@ -1650,6 +1719,134 @@ begin
end;
{ TDataPointDistanceTool }
constructor TDataPointDistanceTool.Create(AOwner: TComponent);
begin
inherited;
SetLength(FAnchors, 2);
FAnchors[0] := TDataPointTool.TPointRef.Create;
FAnchors[1] := TDataPointTool.TPointRef.Create;
end;
destructor TDataPointDistanceTool.Destroy;
begin
FAnchors[0].Free;
FAnchors[1].Free;
inherited;
end;
procedure TDataPointDistanceTool.DoDraw;
var
p1, p2: TPoint;
begin
p1 := FChart.GraphToImage(PointStart.GraphPos);
p2 := FChart.GraphToImage(PointEnd.GraphPos);
case MeasureMode of
cdmOnlyX: p2.Y := p1.Y;
cdmOnlyY: p2.X := p1.X;
end;
if p1 = p2 then exit;
FChart.Drawer.Line(p1, p2);
end;
function TDataPointDistanceTool.FindRef(
APoint: TPoint; ADest: TDataPointTool.TPointRef): Boolean;
begin
if dpdoLockToData in Options then begin
FindNearestPoint(APoint);
if FSeries = nil then exit(false);
with ADest do begin
FGraphPos := FNearestGraphPoint;
FIndex := PointIndex;
FSeries := Self.FSeries;
end;
end
else
ADest.SetGraphPos(FChart.ImageToGraph(APoint));
Result := true;
end;
function TDataPointDistanceTool.GetPointEnd: TDataPointTool.TPointRef;
begin
Result := FAnchors[High(FAnchors)];
end;
procedure TDataPointDistanceTool.KeyDown(APoint: TPoint);
begin
MouseDown(APoint);
end;
procedure TDataPointDistanceTool.KeyUp(APoint: TPoint);
begin
MouseUp(APoint);
end;
procedure TDataPointDistanceTool.MouseDown(APoint: TPoint);
begin
DoHide;
if not FindRef(APoint, PointStart) then exit;
Activate;
PointEnd.Assign(PointStart);
Handled;
end;
procedure TDataPointDistanceTool.MouseMove(APoint: TPoint);
var
newEnd: TPointRef;
begin
if not IsActive then exit;
newEnd := TPointRef.Create;
try
if
not FindRef(APoint, newEnd) or
not SameTransformations(PointStart.Series, newEnd.Series)
then
exit;
DoHide;
PointEnd.Assign(newEnd);
if EffectiveDrawingMode = tdmXor then
DoDraw;
finally
FreeAndNil(newEnd);
end;
Handled;
end;
procedure TDataPointDistanceTool.MouseUp(APoint: TPoint);
begin
MouseMove(APoint);
Deactivate;
end;
function TDataPointDistanceTool.SameTransformations(
ASeries1, ASeries2: TBasicChartSeries): Boolean;
function CheckAxis(AAxisIndex1, AAxisIndex2: Integer): Boolean; inline;
begin
Result :=
TransformByAxis(FChart.AxisList, AAxisIndex1) =
TransformByAxis(FChart.AxisList, AAxisIndex2);
end;
var
s1: TCustomChartSeries absolute ASeries1;
s2: TCustomChartSeries absolute ASeries2;
begin
Result :=
(ASeries1 = ASeries2) or
(ASeries1 is TCustomChartSeries) and
(ASeries2 is TCustomChartSeries) and
((MeasureMode = cdmOnlyY) or CheckAxis(s1.AxisIndexX, s2.AxisIndexX)) and
((MeasureMode = cdmOnlyX) or CheckAxis(s1.AxisIndexY, s2.AxisIndexY));
end;
procedure TDataPointDistanceTool.SetOptions(AValue: TOptions);
begin
if FOptions = AValue then exit;
FOptions := AValue;
end;
initialization
ToolsClassRegistry := TStringList.Create;
@ -1665,6 +1862,7 @@ initialization
RegisterChartToolClass(TDataPointDragTool, 'Data point drag');
RegisterChartToolClass(TDataPointHintTool, 'Data point hint');
RegisterChartToolClass(TDataPointCrosshairTool, 'Data point crosshair');
RegisterChartToolClass(TDataPointDistanceTool, 'Distance measurement');
RegisterChartToolClass(TUserDefinedTool, 'User-defined');
finalization