mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-05-02 00:23:38 +02:00
719 lines
20 KiB
ObjectPascal
719 lines
20 KiB
ObjectPascal
{
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*****************************************************************************
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* *
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* See the file COPYING.modifiedLGPL.txt, included in this distribution, *
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* for details about the copyright. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
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* *
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*****************************************************************************
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Authors: Alexander Klenin
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}
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unit TAChartAxisUtils;
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{$H+}
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interface
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uses
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Classes, Graphics,
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TAChartUtils, TACustomSource, TADrawUtils, TAIntervalSources, TAStyles,
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TATypes;
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const
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DEF_TITLE_DISTANCE = 4;
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type
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TChartAxisBrush = class(TBrush)
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published
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property Style default bsClear;
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end;
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TChartAxisFramePen = class(TChartPen)
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published
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property Style default psClear;
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end;
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{$IFNDEF fpdoc} // Workaround for issue #18549.
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TCustomChartAxisTitle =
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specialize TGenericChartMarks<TChartAxisBrush, TChartPen, TChartAxisFramePen>;
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{$ENDIF}
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{ TChartAxisTitle }
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TChartAxisTitle = class(TCustomChartAxisTitle)
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strict private
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FCaption: String;
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function GetFont: TFont;
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procedure SetCaption(AValue: String);
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procedure SetFont(AValue: TFont);
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public
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constructor Create(AOwner: TCustomChart);
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public
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procedure Assign(Source: TPersistent); override;
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published
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property Caption: String read FCaption write SetCaption;
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property Distance default DEF_TITLE_DISTANCE;
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// Use LabelFont instead.
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property Font: TFont read GetFont write SetFont stored false; deprecated;
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property Frame;
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property LabelBrush;
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property Visible default false;
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end;
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ICoordTransformer = interface
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['{6EDA0F9F-ED59-4CA6-BA68-E247EB88AE3D}']
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function XGraphToImage(AX: Double): Integer;
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function YGraphToImage(AY: Double): Integer;
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end;
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TChartAxisAlignment = (calLeft, calTop, calRight, calBottom);
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TChartAxisMargins = array [TChartAxisAlignment] of Integer;
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TChartAxisMarkToTextEvent =
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procedure (var AText: String; AMark: Double) of object;
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{$IFNDEF fpdoc} // Workaround for issue #18549.
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TBasicChartAxisMarks =
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specialize TGenericChartMarks<TChartAxisBrush, TChartPen, TChartAxisFramePen>;
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{$ENDIF}
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TCustomChartAxisMarks = class(TBasicChartAxisMarks)
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strict private
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FDefaultListener: TListener;
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FDefaultSource: TIntervalChartSource;
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FStripes: TChartStyles;
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procedure SetStripes(AValue: TChartStyles);
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strict protected
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function IsFormatStored: Boolean;
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public
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constructor Create(AOwner: TCustomChart);
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destructor Destroy; override;
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function Measure(
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ADrawer: IChartDrawer; AIsVertical: Boolean; ATickLength: Integer;
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AValues: TChartValueTextArray): Integer;
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property DefaultSource: TIntervalChartSource read FDefaultSource;
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property Stripes: TChartStyles read FStripes write SetStripes;
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end;
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TChartMinorAxisMarks = class(TCustomChartAxisMarks)
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public
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constructor Create(AOwner: TCustomChart);
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published
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property Distance default 1;
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property Format;
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property Frame;
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property LabelBrush;
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property OverlapPolicy;
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property Style default smsNone;
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end;
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{ TChartAxisMarks }
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TChartAxisMarks = class(TCustomChartAxisMarks)
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strict private
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FAtDataOnly: Boolean;
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FListener: TListener;
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FRange: TChartRange;
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FSource: TCustomChartSource;
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procedure SetAtDataOnly(AValue: Boolean);
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procedure SetRange(AValue: TChartRange);
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procedure SetSource(AValue: TCustomChartSource);
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public
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constructor Create(AOwner: TCustomChart);
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destructor Destroy; override;
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function SourceDef: TCustomChartSource;
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published
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property AtDataOnly: Boolean
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read FAtDataOnly write SetAtDataOnly default false;
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property Distance default 1;
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property Format stored IsFormatStored;
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property Frame;
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property LabelBrush;
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property OverlapPolicy;
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property Range: TChartRange read FRange write SetRange;
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property Source: TCustomChartSource read FSource write SetSource;
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property Stripes;
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property Style default smsValue;
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property YIndex;
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end;
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TChartAxisGridPen = class(TChartPen)
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published
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property Style default psDot;
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end;
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TChartBasicAxis = class(TCollectionItem)
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strict private
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FArrow: TChartArrow;
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FGrid: TChartAxisGridPen;
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FTickColor: TColor;
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FTickLength: Integer;
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FVisible: Boolean;
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function GetIntervals: TChartAxisIntervalParams;
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procedure SetArrow(AValue: TChartArrow);
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procedure SetGrid(AValue: TChartAxisGridPen);
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procedure SetIntervals(AValue: TChartAxisIntervalParams);
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procedure SetTickColor(AValue: TColor);
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procedure SetTickLength(AValue: Integer);
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procedure SetVisible(AValue: Boolean);
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strict protected
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FMarks: TCustomChartAxisMarks;
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function GetAlignment: TChartAxisAlignment; virtual; abstract;
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procedure SetAlignment(AValue: TChartAxisAlignment); virtual; abstract;
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procedure SetMarks(AValue: TCustomChartAxisMarks);
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procedure StyleChanged(ASender: TObject); virtual; abstract;
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public
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constructor Create(ACollection: TCollection; AChart: TCustomChart); overload;
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destructor Destroy; override;
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public
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procedure Assign(ASource: TPersistent); override;
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function TryApplyStripes(
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ADrawer: IChartDrawer; var AIndex: Cardinal): Boolean;
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property Alignment: TChartAxisAlignment
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read GetAlignment write SetAlignment;
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property Arrow: TChartArrow read FArrow write SetArrow;
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property Marks: TCustomChartAxisMarks read FMarks write SetMarks;
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published
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property Grid: TChartAxisGridPen read FGrid write SetGrid;
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property Intervals: TChartAxisIntervalParams
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read GetIntervals write SetIntervals;
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property TickColor: TColor read FTickColor write SetTickColor default clBlack;
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property TickLength: Integer read FTickLength write SetTickLength;
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property Visible: Boolean read FVisible write SetVisible default true;
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end;
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{ TAxisDrawHelper }
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TAxisDrawHelper = class
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strict private
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FPrevLabelPoly: TPointArray;
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strict protected
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procedure BarZ(AX1, AY1, AX2, AY2: Integer); inline;
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procedure DrawLabel(ALabelCenter: TPoint; const AText: String); inline;
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procedure DrawLabelAndTick(
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ACoord, AFixedCoord: Integer; const AText: String); virtual; abstract;
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procedure GridLine(ACoord: Integer); virtual; abstract;
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procedure InternalAxisLine(
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APen: TChartPen; const AStart, AEnd: TPoint; AAngle: Double);
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function IsInClipRange(ACoord: Integer): Boolean;
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procedure LineZ(AP1, AP2: TPoint); inline;
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function TryApplyStripes: Boolean; inline;
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public
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FAxis: TChartBasicAxis;
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FAxisTransf: TTransformFunc;
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FClipRangeDelta: Integer;
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FClipRect: ^TRect;
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FDrawer: IChartDrawer;
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FPrevCoord: Integer;
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FScaledTickLength: Integer;
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FStripeIndex: Cardinal;
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FTransf: ICoordTransformer;
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FValueMax: Double;
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FValueMin: Double;
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FZOffset: TPoint;
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procedure BeginDrawing; virtual;
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function Clone: TAxisDrawHelper;
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constructor Create; virtual;
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procedure DrawAxisLine(
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APen: TChartPen; AFixedCoord: Integer); virtual; abstract;
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procedure DrawMark(
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AFixedCoord: Integer; AMark: Double; const AText: String);
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procedure EndDrawing; virtual; abstract;
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procedure GetClipRange(out AMin, AMax: Integer); virtual; abstract;
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function GraphToImage(AGraph: Double): Integer; virtual; abstract;
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end;
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TAxisDrawHelperClass = class of TAxisDrawHelper;
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{ TAxisDrawHelperX }
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TAxisDrawHelperX = class(TAxisDrawHelper)
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strict protected
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procedure DrawLabelAndTick(
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ACoord, AFixedCoord: Integer; const AText: String); override;
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procedure GridLine(ACoord: Integer); override;
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public
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procedure BeginDrawing; override;
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procedure DrawAxisLine(APen: TChartPen; AFixedCoord: Integer); override;
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procedure EndDrawing; override;
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procedure GetClipRange(out AMin, AMax: Integer); override;
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function GraphToImage(AGraph: Double): Integer; override;
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end;
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{ TAxisDrawHelperY }
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TAxisDrawHelperY = class(TAxisDrawHelper)
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strict protected
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procedure DrawLabelAndTick(
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ACoord, AFixedCoord: Integer; const AText: String); override;
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procedure GridLine(ACoord: Integer); override;
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public
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procedure BeginDrawing; override;
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procedure DrawAxisLine(APen: TChartPen; AFixedCoord: Integer); override;
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procedure EndDrawing; override;
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procedure GetClipRange(out AMin, AMax: Integer); override;
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function GraphToImage(AGraph: Double): Integer; override;
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end;
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implementation
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uses
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Math, SysUtils,
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TAGeometry, TAMath;
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{ TChartMinorAxisMarks }
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constructor TChartMinorAxisMarks.Create(AOwner: TCustomChart);
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begin
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inherited Create(AOwner);
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FStyle := smsNone;
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FFormat := SERIES_MARK_FORMATS[FStyle];
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end;
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{ TAxisDrawHelper }
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procedure TAxisDrawHelper.BarZ(AX1, AY1, AX2, AY2: Integer);
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begin
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with FZOffset do
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FDrawer.FillRect(AX1 + X, AY1 + Y, AX2 + X, AY2 + Y);
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end;
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procedure TAxisDrawHelper.BeginDrawing;
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begin
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FScaledTickLength := FDrawer.Scale(FAxis.TickLength);
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end;
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function TAxisDrawHelper.Clone: TAxisDrawHelper;
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begin
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Result := TAxisDrawHelperClass(ClassType).Create;
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Result.FAxis := FAxis;
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Result.FAxisTransf := FAxisTransf;
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Result.FClipRect := FClipRect;
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Result.FDrawer := FDrawer;
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Result.FTransf := FTransf;
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Result.FValueMax := FValueMax;
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Result.FValueMin := FValueMin;
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Result.FZOffset := FZOffset;
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end;
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constructor TAxisDrawHelper.Create;
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begin
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inherited; // Empty -- just to enforce a virtual constructor.
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end;
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procedure TAxisDrawHelper.DrawLabel(ALabelCenter: TPoint; const AText: String);
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begin
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ALabelCenter += FZOffset;
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FAxis.Marks.DrawLabel(
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FDrawer, ALabelCenter, ALabelCenter, AText, FPrevLabelPoly);
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end;
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procedure TAxisDrawHelper.DrawMark(
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AFixedCoord: Integer; AMark: Double; const AText: String);
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var
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coord: Integer;
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begin
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coord := GraphToImage(AMark);
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if
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not IsInClipRange(coord) or not InRangeUlps(AMark, FValueMin, FValueMax, 2)
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then exit;
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if FAxis.Grid.Visible then begin
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FDrawer.Pen := FAxis.Grid;
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FDrawer.SetBrushParams(bsClear, clTAColor);
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GridLine(coord);
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FPrevCoord := coord;
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end;
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if FAxis.Marks.Visible then begin
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FDrawer.PrepareSimplePen(FAxis.TickColor);
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DrawLabelAndTick(coord, AFixedCoord, AText);
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end;
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end;
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procedure TAxisDrawHelper.InternalAxisLine(
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APen: TChartPen; const AStart, AEnd: TPoint; AAngle: Double);
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begin
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if not APen.Visible and not FAxis.Arrow.Visible then exit;
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FDrawer.Pen := APen;
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if APen.Visible then
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LineZ(AStart, AEnd);
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if FAxis.Arrow.Visible then
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FAxis.Arrow.Draw(FDrawer, AEnd + FZOffset, AAngle, APen);
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end;
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function TAxisDrawHelper.IsInClipRange(ACoord: Integer): Boolean;
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var
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rmin, rmax: Integer;
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begin
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GetClipRange(rmin, rmax);
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Result := InRange(ACoord, rmin + FClipRangeDelta, rmax - FClipRangeDelta);
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end;
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procedure TAxisDrawHelper.LineZ(AP1, AP2: TPoint);
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begin
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FDrawer.Line(AP1 + FZOffset, AP2 + FZOffset);
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end;
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function TAxisDrawHelper.TryApplyStripes: Boolean;
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begin
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Result := FAxis.TryApplyStripes(FDrawer, FStripeIndex);
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end;
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{ TAxisDrawHelperX }
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procedure TAxisDrawHelperX.BeginDrawing;
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begin
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inherited;
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FPrevCoord := FClipRect^.Left;
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end;
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procedure TAxisDrawHelperX.DrawAxisLine(APen: TChartPen; AFixedCoord: Integer);
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var
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p: TPoint;
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begin
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p := Point(FClipRect^.Right, AFixedCoord);
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if FAxis.Arrow.Visible then
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p.X += FDrawer.Scale(FAxis.Arrow.Length);
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InternalAxisLine(APen, Point(FClipRect^.Left, AFixedCoord), p, 0);
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end;
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procedure TAxisDrawHelperX.DrawLabelAndTick(
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ACoord, AFixedCoord: Integer; const AText: String);
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var
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d: Integer;
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begin
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d := FScaledTickLength + FAxis.Marks.CenterOffset(FDrawer, AText).cy;
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if FAxis.Alignment = calTop then
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d := -d;
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LineZ(
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Point(ACoord, AFixedCoord - FScaledTickLength),
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Point(ACoord, AFixedCoord + FScaledTickLength));
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DrawLabel(Point(ACoord, AFixedCoord + d), AText);
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end;
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procedure TAxisDrawHelperX.EndDrawing;
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begin
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if FAxis.Grid.Visible and TryApplyStripes then
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BarZ(FPrevCoord + 1, FClipRect^.Top + 1, FClipRect^.Right, FClipRect^.Bottom);
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end;
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procedure TAxisDrawHelperX.GetClipRange(out AMin, AMax: Integer);
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begin
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AMin := FClipRect^.Left;
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AMax := FClipRect^.Right;
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end;
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function TAxisDrawHelperX.GraphToImage(AGraph: Double): Integer;
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begin
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Result := FTransf.XGraphToImage(AGraph);
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end;
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procedure TAxisDrawHelperX.GridLine(ACoord: Integer);
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begin
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if TryApplyStripes then
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BarZ(FPrevCoord + 1, FClipRect^.Top + 1, ACoord, FClipRect^.Bottom);
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LineZ(Point(ACoord, FClipRect^.Top), Point(ACoord, FClipRect^.Bottom));
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end;
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{ TAxisDrawHelperY }
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procedure TAxisDrawHelperY.BeginDrawing;
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begin
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inherited;
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FPrevCoord := FClipRect^.Bottom;
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end;
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procedure TAxisDrawHelperY.DrawAxisLine(APen: TChartPen; AFixedCoord: Integer);
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var
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p: TPoint;
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begin
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p := Point(AFixedCoord, FClipRect^.Top);
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if FAxis.Arrow.Visible then
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p.Y -= FDrawer.Scale(FAxis.Arrow.Length);
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InternalAxisLine(APen, Point(AFixedCoord, FClipRect^.Bottom), p, -Pi / 2);
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end;
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procedure TAxisDrawHelperY.DrawLabelAndTick(
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ACoord, AFixedCoord: Integer; const AText: String);
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var
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d: Integer;
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begin
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d := FScaledTickLength + FAxis.Marks.CenterOffset(FDrawer, AText).cx;
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if FAxis.Alignment = calLeft then
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d := -d;
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LineZ(
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Point(AFixedCoord - FScaledTickLength, ACoord),
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Point(AFixedCoord + FScaledTickLength, ACoord));
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DrawLabel(Point(AFixedCoord + d, ACoord), AText);
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end;
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procedure TAxisDrawHelperY.EndDrawing;
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begin
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if FAxis.Grid.Visible and TryApplyStripes then
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BarZ(FClipRect^.Left + 1, FClipRect^.Top + 1, FClipRect^.Right, FPrevCoord);
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end;
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procedure TAxisDrawHelperY.GetClipRange(out AMin, AMax: Integer);
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begin
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AMin := FClipRect^.Top;
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AMax := FClipRect^.Bottom;
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end;
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function TAxisDrawHelperY.GraphToImage(AGraph: Double): Integer;
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begin
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Result := FTransf.YGraphToImage(AGraph);
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end;
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procedure TAxisDrawHelperY.GridLine(ACoord: Integer);
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begin
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if TryApplyStripes then
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BarZ(FClipRect^.Left + 1, FPrevCoord, FClipRect^.Right, ACoord);
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LineZ(Point(FClipRect^.Left, ACoord), Point(FClipRect^.Right, ACoord));
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end;
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{ TChartAxisTitle }
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procedure TChartAxisTitle.Assign(Source: TPersistent);
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begin
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if Source is TChartAxisTitle then
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with TChartAxisTitle(Source) do begin
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Self.FLabelBrush.Assign(FLabelBrush);
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Self.FLabelFont.Assign(FLabelFont);
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Self.FLinkPen.Assign(FLinkPen);
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Self.FCaption := FCaption;
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end;
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inherited Assign(Source);
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end;
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constructor TChartAxisTitle.Create(AOwner: TCustomChart);
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begin
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inherited Create(AOwner);
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FDistance := DEF_TITLE_DISTANCE;
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FLabelBrush.Style := bsClear;
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FVisible := false;
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end;
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function TChartAxisTitle.GetFont: TFont;
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begin
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Result := LabelFont;
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end;
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procedure TChartAxisTitle.SetCaption(AValue: String);
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begin
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if FCaption = AValue then exit;
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FCaption := AValue;
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StyleChanged(Self);
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end;
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procedure TChartAxisTitle.SetFont(AValue: TFont);
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begin
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LabelFont := AValue;
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end;
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|
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{ TCustomChartAxisMarks }
|
|
|
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constructor TCustomChartAxisMarks.Create(AOwner: TCustomChart);
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begin
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inherited Create(AOwner);
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|
FDefaultListener := TListener.Create(nil, @StyleChanged);
|
|
FDefaultSource := TIntervalChartSource.Create(AOwner);
|
|
FDefaultSource.Broadcaster.Subscribe(FDefaultListener);
|
|
FDistance := 1;
|
|
FLabelBrush.Style := bsClear;
|
|
end;
|
|
|
|
destructor TCustomChartAxisMarks.Destroy;
|
|
begin
|
|
FreeAndNil(FDefaultListener);
|
|
FreeAndNil(FDefaultSource);
|
|
inherited;
|
|
end;
|
|
|
|
function TCustomChartAxisMarks.IsFormatStored: Boolean;
|
|
begin
|
|
Result := FStyle <> smsValue;
|
|
end;
|
|
|
|
function TCustomChartAxisMarks.Measure(ADrawer: IChartDrawer;
|
|
AIsVertical: Boolean; ATickLength: Integer;
|
|
AValues: TChartValueTextArray): Integer;
|
|
var
|
|
t: TChartValueText;
|
|
begin
|
|
Result := 0;
|
|
if not Visible then exit;
|
|
for t in AValues do
|
|
// Workaround for issue #19780, fix after upgrade to FPC 2.6.
|
|
with MeasureLabel(ADrawer, t.FText) do
|
|
Result := Max(IfThen(AIsVertical, cy, cx), Result);
|
|
if Result = 0 then exit;
|
|
if DistanceToCenter then
|
|
Result := Result div 2;
|
|
Result += ADrawer.Scale(ATickLength) + ADrawer.Scale(Distance);
|
|
end;
|
|
|
|
procedure TCustomChartAxisMarks.SetStripes(AValue: TChartStyles);
|
|
begin
|
|
if FStripes = AValue then exit;
|
|
FStripes := AValue;
|
|
StyleChanged(Self);
|
|
end;
|
|
|
|
{ TChartAxisMarks }
|
|
|
|
constructor TChartAxisMarks.Create(AOwner: TCustomChart);
|
|
begin
|
|
inherited Create(AOwner);
|
|
FListener := TListener.Create(@FSource, @StyleChanged);
|
|
FRange := TChartRange.Create(AOwner);
|
|
FStyle := smsValue;
|
|
FFormat := SERIES_MARK_FORMATS[FStyle];
|
|
end;
|
|
|
|
destructor TChartAxisMarks.Destroy;
|
|
begin
|
|
FreeAndNil(FRange);
|
|
FreeAndNil(FListener);
|
|
inherited;
|
|
end;
|
|
|
|
procedure TChartAxisMarks.SetAtDataOnly(AValue: Boolean);
|
|
begin
|
|
if FAtDataOnly = AValue then exit;
|
|
FAtDataOnly := AValue;
|
|
StyleChanged(Self);
|
|
end;
|
|
|
|
procedure TChartAxisMarks.SetRange(AValue: TChartRange);
|
|
begin
|
|
if FRange = AValue then exit;
|
|
FRange.Assign(AValue);
|
|
StyleChanged(Self);
|
|
end;
|
|
|
|
procedure TChartAxisMarks.SetSource(AValue: TCustomChartSource);
|
|
begin
|
|
if FSource = AValue then exit;
|
|
if FListener.IsListening then
|
|
FSource.Broadcaster.Unsubscribe(FListener);
|
|
FSource := AValue;
|
|
if FSource <> nil then
|
|
FSource.Broadcaster.Subscribe(FListener);
|
|
StyleChanged(Self);
|
|
end;
|
|
|
|
function TChartAxisMarks.SourceDef: TCustomChartSource;
|
|
begin
|
|
Result := FSource;
|
|
if Result = nil then
|
|
Result := DefaultSource;
|
|
end;
|
|
|
|
{ TChartBasicAxis }
|
|
|
|
procedure TChartBasicAxis.Assign(ASource: TPersistent);
|
|
begin
|
|
if ASource is TChartBasicAxis then
|
|
with TChartBasicAxis(ASource) do begin
|
|
Self.FGrid.Assign(Grid);
|
|
Self.FMarks.Assign(Marks);
|
|
Self.FTickColor := TickColor;
|
|
Self.FTickLength := TickLength;
|
|
Self.FVisible := Visible;
|
|
end
|
|
else
|
|
inherited Assign(ASource);
|
|
end;
|
|
|
|
constructor TChartBasicAxis.Create(
|
|
ACollection: TCollection; AChart: TCustomChart);
|
|
begin
|
|
inherited Create(ACollection);
|
|
FArrow := TChartArrow.Create(AChart);
|
|
FGrid := TChartAxisGridPen.Create;
|
|
FGrid.OnChange := @StyleChanged;
|
|
// FMarks must be created in descendants.
|
|
FTickColor := clBlack;
|
|
FVisible := true;
|
|
end;
|
|
|
|
destructor TChartBasicAxis.Destroy;
|
|
begin
|
|
FreeAndNil(FArrow);
|
|
FreeAndNil(FGrid);
|
|
FreeAndNil(FMarks);
|
|
inherited;
|
|
end;
|
|
|
|
function TChartBasicAxis.GetIntervals: TChartAxisIntervalParams;
|
|
begin
|
|
Result := Marks.DefaultSource.Params;
|
|
end;
|
|
|
|
procedure TChartBasicAxis.SetArrow(AValue: TChartArrow);
|
|
begin
|
|
FArrow.Assign(AValue);
|
|
StyleChanged(Self);
|
|
end;
|
|
|
|
procedure TChartBasicAxis.SetGrid(AValue: TChartAxisGridPen);
|
|
begin
|
|
FGrid.Assign(AValue);
|
|
StyleChanged(Self);
|
|
end;
|
|
|
|
procedure TChartBasicAxis.SetIntervals(AValue: TChartAxisIntervalParams);
|
|
begin
|
|
Marks.DefaultSource.Params := AValue;
|
|
end;
|
|
|
|
procedure TChartBasicAxis.SetMarks(AValue: TCustomChartAxisMarks);
|
|
begin
|
|
FMarks.Assign(AValue);
|
|
StyleChanged(Self);
|
|
end;
|
|
|
|
procedure TChartBasicAxis.SetTickColor(AValue: TColor);
|
|
begin
|
|
if FTickColor = AValue then exit;
|
|
FTickColor := AValue;
|
|
StyleChanged(Self);
|
|
end;
|
|
|
|
procedure TChartBasicAxis.SetTickLength(AValue: Integer);
|
|
begin
|
|
if FTickLength = AValue then exit;
|
|
FTickLength := AValue;
|
|
StyleChanged(Self);
|
|
end;
|
|
|
|
procedure TChartBasicAxis.SetVisible(AValue: Boolean);
|
|
begin
|
|
if FVisible = AValue then exit;
|
|
FVisible := AValue;
|
|
StyleChanged(Self);
|
|
end;
|
|
|
|
function TChartBasicAxis.TryApplyStripes(
|
|
ADrawer: IChartDrawer; var AIndex: Cardinal): Boolean;
|
|
begin
|
|
Result := Marks.Stripes <> nil;
|
|
if not Result then exit;
|
|
Marks.Stripes.Apply(ADrawer, AIndex);
|
|
AIndex += 1;
|
|
end;
|
|
|
|
end.
|