mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-12-02 19:24:46 +01:00
TAChart: Refactoring: use points instead of separate x and y coordinates
git-svn-id: trunk@18890 -
This commit is contained in:
ask
parent
db1388f6e5
commit
3667b3ea5e
@ -38,6 +38,13 @@ const
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clTeal, clNavy, clMaroon, clLime, clOlive, clPurple, clSilver, clAqua);
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type
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TChartCoord = record
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x, y: Double;
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Color: TColor;
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Text: String;
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end;
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PChartCoord = ^TChartCoord;
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TDoublePoint = record
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X, Y: Double;
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end;
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@ -97,10 +104,12 @@ const
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procedure CalculateIntervals(
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AMin, AMax: Double; AxisScale: TAxisScale; out AStart, AStep: Double);
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function DoublePoint(const ACoord: TChartCoord): TDoublePoint;
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function EqualPoints(const A, B: TPoint): Boolean; inline;
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procedure Exchange(var A, B: Integer); overload;
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procedure Exchange(var A, B: Double); overload;
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procedure Exchange(var A, B: TDoublePoint); overload;
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// True if float ranges [A, B] and [C, D] have at least one common point.
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function FloatRangesOverlap(A, B, C, D: Double): Boolean; inline;
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@ -187,6 +196,12 @@ begin
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end; {case AxisScale}
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end;
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function DoublePoint(const ACoord: TChartCoord): TDoublePoint;
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begin
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Result.X := ACoord.x;
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Result.Y := ACoord.y;
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end;
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function EqualPoints(const A, B: TPoint): Boolean;
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begin
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Result := (A.X = B.X) and (A.Y = B.Y);
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@ -210,6 +225,15 @@ begin
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B := t;
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end;
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procedure Exchange(var A, B: TDoublePoint);
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var
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t: TDoublePoint;
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begin
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t := A;
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A := B;
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B := t;
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end;
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function FloatRangesOverlap(A, B, C, D: Double): Boolean; inline;
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begin
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Result := (A <= D) and (C <= B);
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@ -224,7 +224,7 @@ type
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procedure XGraphToImage(Xin: Double; out XOut: Integer);
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procedure YGraphToImage(Yin: Double; out YOut: Integer);
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procedure GraphToImage(Xin, Yin: Double; out XOut, YOut: Integer);
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function GraphToImage(AGraphPoint: TDoublePoint) : TPoint;
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procedure XImageToGraph(XIn: Integer; var XOut: Double);
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procedure YImageToGraph(YIn: Integer; var YOut: Double);
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procedure ImageToGraph(XIn, YIn: Integer; var XOut, YOut: Double);
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@ -238,7 +238,8 @@ type
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function GetNewColor: TColor;
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function GetRectangle: TRect;
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function LineInViewPort(var xg1, yg1, xg2, yg2: Double): Boolean;
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function LineInViewPort(var AG1, AG2: TDoublePoint): Boolean;
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function IsPointInViewPort(const AP: TDoublePoint): Boolean;
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property Canvas;
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@ -1042,10 +1043,10 @@ begin
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YOut := Round(FScale.Y * YIn + FOffset.Y);
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end;
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procedure TChart.GraphToImage(Xin, Yin: Double; out XOut, YOut: Integer);
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function TChart.GraphToImage(AGraphPoint: TDoublePoint): TPoint;
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begin
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XGraphToImage(Xin, XOut);
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YGraphToImage(Yin, YOut);
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XGraphToImage(AGraphPoint.X, Result.X);
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YGraphToImage(AGraphPoint.Y, Result.Y);
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end;
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procedure TChart.XImageToGraph(XIn: Integer; var XOut: Double);
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@ -1064,15 +1065,21 @@ begin
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YImageToGraph(YIn, YOut);
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end;
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function TChart.LineInViewPort(var xg1, yg1, xg2, yg2: Double): Boolean;
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function TChart.IsPointInViewPort(const AP: TDoublePoint): Boolean;
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begin
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Result :=
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InRange(AP.X, XGraphMin, XGraphMax) and InRange(AP.Y, YGraphMin, YGraphMax);
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end;
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function TChart.LineInViewPort(var AG1, AG2: TDoublePoint): Boolean;
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var
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dx, dy, dxy, u1, u2, u3, u4: Double;
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procedure CalcDeltas;
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begin
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dy := yg1 - yg2;
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dx := xg1 - xg2;
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dxy := xg1 * yg2 - yg1 * xg2;
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dy := AG1.Y - AG2.Y;
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dx := AG1.X - AG2.X;
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dxy := AG1.X * AG2.Y - AG1.Y * AG2.X;
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end;
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begin
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@ -1085,46 +1092,46 @@ begin
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Result := false;
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if u1 * u2 < 0 then begin
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Result := true;
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if xg1 < XGraphMin then begin
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yg1 := (XGraphMin * dy + dxy) / dx;
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xg1 := XGraphMin;
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if AG1.X < XGraphMin then begin
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AG1.Y := (XGraphMin * dy + dxy) / dx;
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AG1.X := XGraphMin;
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CalcDeltas;
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end;
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if xg2 < XGraphMin then begin
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yg2 := (XGraphMin * dy + dxy) / dx;
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xg2 := XGraphMin;
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if AG2.X < XGraphMin then begin
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AG2.Y := (XGraphMin * dy + dxy) / dx;
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AG2.X := XGraphMin;
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CalcDeltas;
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end;
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end;
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if u2 * u3 < 0 then begin
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Result := true;
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if yg2 > YGraphMax then begin
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xg2 := (YGraphMax * dx - dxy) / dy;
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yg2 := YGraphMax;
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if AG2.Y > YGraphMax then begin
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AG2.X := (YGraphMax * dx - dxy) / dy;
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AG2.Y := YGraphMax;
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CalcDeltas;
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end;
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end;
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if u3 * u4 < 0 then begin
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Result := true;
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if xg1 > XGraphMax then begin
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yg1 := (XGraphMax * dy + dxy) / dx;
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xg1 := XGraphMax;
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if AG1.X > XGraphMax then begin
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AG1.Y := (XGraphMax * dy + dxy) / dx;
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AG1.X := XGraphMax;
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CalcDeltas;
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end;
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if xg2 > XGraphMax then begin
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yg2:= (XGraphMax * dy + dxy) / dx;
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xg2:= XGraphMax;
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if AG2.X > XGraphMax then begin
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AG2.Y := (XGraphMax * dy + dxy) / dx;
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AG2.X := XGraphMax;
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CalcDeltas;
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end;
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end;
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if u4 * u1 < 0 then begin
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Result := true;
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if yg1 < YGraphMin then begin
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xg1:= (YGraphMin * dx - dxy) / dy;
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yg1:= YGraphMin;
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if AG1.Y < YGraphMin then begin
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AG1.X := (YGraphMin * dx - dxy) / dy;
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AG1.Y := YGraphMin;
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CalcDeltas;
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end;
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end;
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@ -33,14 +33,6 @@ uses
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TAGraph, TAChartUtils, TATypes;
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type
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TChartCoord = record
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x, y: Double;
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Color: TColor;
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Text: String;
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end;
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PChartCoord = ^TChartCoord;
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TSeriesPointerStyle = (
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psRectangle, psCircle, psCross, psDiagCross, psStar,
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psLowBracket, psHighBracket);
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@ -78,6 +70,7 @@ type
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var ANumPoints: Integer; var AXMin, AYMin, AXMax, AYMax: Double); override;
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procedure UpdateParentChart;
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function GetValuesTotal: Double;
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procedure GetCoords(AIndex: Integer; out AG: TDoublePoint; out AI: TPoint);
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public
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constructor Create(AOwner: TComponent); override;
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destructor Destroy; override;
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@ -383,6 +376,13 @@ begin
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end;
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end;
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procedure TChartSeries.GetCoords(
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AIndex: Integer; out AG: TDoublePoint; out AI: TPoint);
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begin
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AG := DoublePoint(PChartCoord(FCoordList[AIndex])^);
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AI := ParentChart.GraphToImage(AG);
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end;
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function TChartSeries.GetLegendCount: Integer;
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begin
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Result := 1;
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@ -705,10 +705,9 @@ end;
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procedure TSerie.Draw(ACanvas: TCanvas);
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var
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xi1, yi1, xi2, yi2: Integer;
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xg1, yg1, xg2, yg2: Double;
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i1, i2: TPoint;
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g1, g2: TDoublePoint;
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XMin, XMax, YMin, YMax: Integer;
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chartCoord: PChartCoord;
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function PrepareLine: Boolean;
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begin
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@ -717,43 +716,35 @@ var
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with ParentChart do
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if // line is totally outside the viewport
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(xg1 < XGraphMin) and (xg2 < XGraphMin) or
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(xg1 > XGraphMax) and (xg2 > XGraphMax) or
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(yg1 < YGraphMin) and (yg2 < YGraphMin) or
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(yg1 > YGraphMax) and (yg2 > YGraphMax)
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(g1.X < XGraphMin) and (g2.X < XGraphMin) or
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(g1.X > XGraphMax) and (g2.X > XGraphMax) or
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(g1.Y < YGraphMin) and (g2.Y < YGraphMin) or
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(g1.Y > YGraphMax) and (g2.Y > YGraphMax)
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then
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exit;
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Result := true;
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// line is totally inside the viewport
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with ParentChart do
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if // line is totally inside the viewport
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InRange(xg1, XGraphMin, XGraphMax) and
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InRange(xg2, XGraphMin, XGraphMax) and
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InRange(yg1, YGraphMin, YGraphMax) and
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InRange(yg2, YGraphMin, YGraphMax)
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then
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if IsPointInViewPort(g1) and IsPointInViewPort(g2) then
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exit;
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if yg1 > yg2 then begin
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Exchange(xg1, xg2);
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Exchange(yg1, yg2);
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end;
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if g1.Y > g2.Y then
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Exchange(g1, g2);
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if yg1 = yg2 then begin
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if xg1 > xg2 then begin
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Exchange(xg1, xg2);
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Exchange(yg1, yg2);
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end;
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if xg1 < ParentChart.XGraphMin then xi1 := ParentChart.XImageMin;
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if xg2 > ParentChart.XGraphMax then xi2 := ParentChart.XImageMax;
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if g1.Y = g2.Y then begin
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if g1.X > g2.X then
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Exchange(g1, g2);
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if g1.X < ParentChart.XGraphMin then i1.X := ParentChart.XImageMin;
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if g2.X > ParentChart.XGraphMax then i2.X := ParentChart.XImageMax;
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end
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else if xg1 = xg2 then begin
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if yg1 < ParentChart.YGraphMin then yi1 := ParentChart.YImageMin;
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if yg2 > ParentChart.YGraphMax then yi2 := ParentChart.YImageMax;
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else if g1.X = g2.X then begin
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if g1.Y < ParentChart.YGraphMin then i1.Y := ParentChart.YImageMin;
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if g2.Y > ParentChart.YGraphMax then i2.Y := ParentChart.YImageMax;
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end
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else if ParentChart.LineInViewPort(xg1, yg1, xg2, yg2) then begin
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ParentChart.GraphToImage(xg1, yg1, xi1, yi1);
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ParentChart.GraphToImage(xg2, yg2, xi2, yi2);
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else if ParentChart.LineInViewPort(g1, g2) then begin
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i1 := ParentChart.GraphToImage(g1);
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i2 := ParentChart.GraphToImage(g2);
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end
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else
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Result := false;
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@ -762,18 +753,9 @@ var
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procedure DrawPoint;
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begin
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if
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FShowPoints and InRange(yi1, YMin, YMax) and InRange(xi1, XMin, XMax)
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FShowPoints and InRange(i1.Y, YMin, YMax) and InRange(i1.X, XMin, XMax)
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then
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FPointer.Draw(ACanvas, xi1, yi1, SeriesColor);
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end;
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procedure GetCoords(
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AIndex: Integer; out AX, AY: Double; out AXScr, AYScr: Integer);
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begin
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chartCoord := FCoordList.Items[AIndex];
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AX := chartCoord^.x;
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AY := chartCoord^.y;
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ParentChart.GraphToImage(AX, AY, AXScr, AYScr);
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FPointer.Draw(ACanvas, i1.X, i1.Y, SeriesColor);
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end;
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var
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@ -786,31 +768,27 @@ begin
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ACanvas.Pen.Width := 1;
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for i := 0 to Count - 2 do begin
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GetCoords(i, xg1, yg1, xi1, yi1);
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GetCoords(i + 1, xg2, yg2, xi2, yi2);
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GetCoords(i, g1, i1);
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GetCoords(i + 1, g2, i2);
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if PrepareLine then begin
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ACanvas.Pen.Style := FStyle;
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ACanvas.Pen.Color := chartCoord^.Color;
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ACanvas.MoveTo(xi1, yi1);
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ACanvas.LineTo(xi2, yi2);
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ACanvas.Pen.Color := PChartCoord(FCoordList[i])^.Color;
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ACanvas.Line(i1, i2);
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end;
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DrawPoint;
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end;
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// Draw last point
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GetCoords(Count - 1, xg1, yg1, xi1, yi1);
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GetCoords(Count - 1, g1, i1);
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DrawPoint;
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if not Marks.IsMarkLabelsVisible then exit;
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for i := 0 to Count - 1 do begin
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GetCoords(i, xg1, yg1, xi1, yi1);
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GetCoords(i, g1, i1);
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with ParentChart do
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if
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InRange(xg1, XGraphMin, XGraphMax) and
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InRange(yg1, YGraphMin, YGraphMax)
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then
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DrawLabel(ACanvas, i, Point(xi1, yi1), yg1 < 0);
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if IsPointInViewPort(g1) then
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DrawLabel(ACanvas, i, i1, g1.Y < 0);
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end;
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end;
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@ -1261,33 +1239,31 @@ end;
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procedure TBarSeries.Draw(ACanvas: TCanvas);
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var
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barX, barTopY, barBottomY: Double;
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barTop: TDoublePoint;
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i, barWidth, totalbarWidth, totalBarSeries, myPos: Integer;
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r: TRect;
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function PrepareBar: Boolean;
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var
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barBottomY: Double;
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begin
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with PChartCoord(FCoordList.Items[i])^ do begin
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barX := x;
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barTopY := y;
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end;
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barTop := DoublePoint(PChartCoord(FCoordList.Items[i])^);
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barBottomY := 0;
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if barTopY < barBottomY then
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Exchange(barTopY, barBottomY);
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if barTop.Y < barBottomY then
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Exchange(barTop.Y, barBottomY);
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with ParentChart do begin
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// Check if bar is in view port.
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Result :=
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InRange(barX, XGraphMin, XGraphMax) and
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FloatRangesOverlap(barBottomY, barTopY, YGraphMin, YGraphMax);
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InRange(barTop.X, XGraphMin, XGraphMax) and
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FloatRangesOverlap(barBottomY, barTop.Y, YGraphMin, YGraphMax);
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if not Result then exit;
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// Only draw to the limits.
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if barTopY > YGraphMax then barTopY := YGraphMax;
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if barTop.Y > YGraphMax then barTop.Y := YGraphMax;
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if barBottomY < YGraphMin then barBottomY := YGraphMin;
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//convert from graph to imgs coords
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GraphToImage(barX, barTopY, r.Left, r.Top);
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r.TopLeft := GraphToImage(barTop);
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YGraphToImage(barBottomY, r.Bottom);
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end;
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@ -1327,8 +1303,8 @@ begin
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if PrepareBar then
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DrawLabel(
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ACanvas, i,
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Point((r.Left + r.Right) div 2, ifthen(barTopY = 0, r.Bottom, r.Top)),
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barTopY = 0);
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Point((r.Left + r.Right) div 2, ifthen(barTop.Y = 0, r.Bottom, r.Top)),
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barTop.Y = 0);
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end;
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procedure TBarSeries.DrawLegend(ACanvas: TCanvas; const ARect: TRect);
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@ -1565,17 +1541,14 @@ end;
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procedure TAreaSeries.Draw(ACanvas: TCanvas);
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var
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i: Integer;
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xi1, yi1, xi2, yi2, xi2a: Integer;
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xg1, yg1, xg2, yg2: Double;
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i, xi2a, iy_min: Integer;
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i1, i2: TPoint;
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g1, g2: TDoublePoint;
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XMin, XMax, YMin, YMax: Integer;
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graphCoord: PChartCoord;
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iy_min: Integer;
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procedure DrawPart;
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begin
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ACanvas.Polygon([
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Point(xi1, iy_min), Point(xi1, yi1), Point(xi2, yi2), Point(xi2, iy_min)]);
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ACanvas.Polygon([Point(i1.X, iy_min), i1, i2, Point(i2.X, iy_min)]);
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end;
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begin
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@ -1588,33 +1561,23 @@ begin
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ACanvas.Pen.Width := 1;
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for i := 0 to Count - 2 do begin
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graphCoord := FCoordList.Items[i];
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xg1 := graphCoord^.x;
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yg1 := graphCoord^.y;
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ParentChart.GraphToImage(xg1, yg1, xi1, yi1);
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graphCoord := FCoordList.Items[i + 1];
|
||||
xg2 := graphCoord^.x;
|
||||
yg2 := graphCoord^.y;
|
||||
ParentChart.GraphToImage(xg2, yg2, xi2, yi2);
|
||||
GetCoords(i, g1, i1);
|
||||
GetCoords(i + 1, g2, i2);
|
||||
|
||||
ParentChart.YGraphToImage(ParentChart.YGraphMin, iy_min);
|
||||
iy_min := ParentChart.YImageMin;
|
||||
ACanvas.Pen.Color:= clBlack;
|
||||
ACanvas.Brush.Color:= graphCoord^.Color;
|
||||
ACanvas.Brush.Color:= PChartCoord(FCoordList.Items[i])^.Color;
|
||||
|
||||
with ParentChart do
|
||||
if // top line is totally inside the viewport
|
||||
InRange(xg1, XGraphMin, XGraphMax) and
|
||||
InRange(xg2, XGraphMin, XGraphMax) and
|
||||
InRange(yg1, YGraphMin, YGraphMax) and
|
||||
InRange(yg2, YGraphMin, YGraphMax)
|
||||
// top line is totally inside the viewport
|
||||
if
|
||||
ParentChart.IsPointInViewPort(g1) and ParentChart.IsPointInViewPort(g2)
|
||||
then begin
|
||||
if FStairs then begin
|
||||
if FInvertedStairs then
|
||||
ACanvas.Polygon([
|
||||
Point(xi1, iy_min), Point(xi1, yi2), Point(xi2, yi2), Point(xi2, iy_min)])
|
||||
ACanvas.Polygon([Point(i1.X, iy_min), i1, i2, Point(i2.X, iy_min)])
|
||||
else
|
||||
ACanvas.Polygon([
|
||||
Point(xi1, iy_min), Point(xi1, yi1), Point(xi2, yi1), Point(xi2, iy_min)])
|
||||
Point(i1.X, iy_min), i1, Point(i2.X, i1.Y), Point(i2.X, iy_min)])
|
||||
end else
|
||||
DrawPart;
|
||||
continue;
|
||||
@ -1622,60 +1585,51 @@ begin
|
||||
|
||||
with ParentChart do
|
||||
if // top line is totally outside the viewport
|
||||
(xg1 < XGraphMin) and (xg2 < XGraphMin) or
|
||||
(xg1 > XGraphMax) and (xg2 > XGraphMax) or
|
||||
(yg1 < YGraphMin) and (yg2 < YGraphMin)
|
||||
(g1.X < XGraphMin) and (g2.X < XGraphMin) or
|
||||
(g1.X > XGraphMax) and (g2.X > XGraphMax) or
|
||||
(g1.Y < YGraphMin) and (g2.Y < YGraphMin)
|
||||
then
|
||||
continue;
|
||||
|
||||
if yg1 > yg2 then begin
|
||||
Exchange(xg1, xg2); Exchange(yg1, yg2);
|
||||
Exchange(xi1, xi2); Exchange(yi1, yi2);
|
||||
if g1.Y > g2.Y then begin
|
||||
Exchange(g1, g2);
|
||||
Exchange(i1.X, i2.X); Exchange(i1.Y, i2.Y);
|
||||
end;
|
||||
|
||||
if yg1 = yg2 then begin
|
||||
if xg1 > xg2 then begin
|
||||
Exchange(xg1, xg2);
|
||||
Exchange(yg1, yg2);
|
||||
end;
|
||||
if xg1 < ParentChart.XGraphMin then xi1 := ParentChart.XImageMin;
|
||||
if xg2 > ParentChart.XGraphMax then xi2 := ParentChart.XImageMax;
|
||||
if g1.Y = g2.Y then begin
|
||||
if g1.X > g2.X then
|
||||
Exchange(g1, g2);
|
||||
if g1.X < ParentChart.XGraphMin then i1.X := ParentChart.XImageMin;
|
||||
if g2.X > ParentChart.XGraphMax then i2.X := ParentChart.XImageMax;
|
||||
end
|
||||
else if xg1 = xg2 then begin
|
||||
if yg1 < ParentChart.YGraphMin then yi1 := ParentChart.YImageMin;
|
||||
if yg2 > ParentChart.YGraphMax then yi2 := ParentChart.YImageMax;
|
||||
else if g1.X = g2.X then begin
|
||||
if g1.Y < ParentChart.YGraphMin then i1.Y := ParentChart.YImageMin;
|
||||
if g2.Y > ParentChart.YGraphMax then i2.Y := ParentChart.YImageMax;
|
||||
end
|
||||
else if ParentChart.LineInViewPort(xg1, yg1, xg2, yg2) then begin
|
||||
xi2a := xi2;
|
||||
ParentChart.GraphToImage(xg1, yg1, xi1, yi1);
|
||||
ParentChart.GraphToImage(xg2, yg2, xi2, yi2);
|
||||
if yi2 <= YMin then begin
|
||||
else if ParentChart.LineInViewPort(g1, g2) then begin
|
||||
xi2a := i2.X;
|
||||
i1 := ParentChart.GraphToImage(g1);
|
||||
i2 := ParentChart.GraphToImage(g2);
|
||||
{if i2.Y <= YMin then} begin
|
||||
ACanvas.Polygon([
|
||||
Point(xi1, iy_min), Point(xi1, yi1), Point(xi2, yi2),
|
||||
Point(xi2a, YMin), Point(xi2a, iy_min)]);
|
||||
Point(i1.X, iy_min), i1, i2, Point(xi2a, YMin), Point(xi2a, iy_min)]);
|
||||
continue;
|
||||
end;
|
||||
end
|
||||
else if yg2 >= ParentChart.YGraphMax then begin
|
||||
yi1 := YMin;
|
||||
yi2 := YMin;
|
||||
xi1 := EnsureRange(xi1, XMin, XMax);
|
||||
xi2 := EnsureRange(xi2, XMin, XMax);
|
||||
else if g2.Y >= ParentChart.YGraphMax then begin
|
||||
i1.Y := YMin;
|
||||
i2.Y := YMin;
|
||||
i1.X := EnsureRange(i1.X, XMin, XMax);
|
||||
i2.X := EnsureRange(i2.X, XMin, XMax);
|
||||
end;
|
||||
DrawPart;
|
||||
end;
|
||||
|
||||
if not Marks.IsMarkLabelsVisible then exit;
|
||||
for i := 0 to Count - 1 do begin
|
||||
graphCoord := FCoordList.Items[i];
|
||||
with ParentChart do
|
||||
if
|
||||
not InRange(graphCoord^.x, XGraphMin, XGraphMax) or
|
||||
not InRange(graphCoord^.y, YGraphMin, YGraphMax)
|
||||
then
|
||||
continue;
|
||||
ParentChart.GraphToImage(graphCoord^.x, graphCoord^.y, xi1, yi1);
|
||||
DrawLabel(ACanvas, i, Point(xi1, yi1), false);
|
||||
GetCoords(i, g1, i1);
|
||||
if ParentChart.IsPointInViewPort(g1) then
|
||||
DrawLabel(ACanvas, i, i1, false);
|
||||
end;
|
||||
end;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user