mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
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507 lines
15 KiB
ObjectPascal
507 lines
15 KiB
ObjectPascal
unit vtprimitives;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils, fpcanvas, fpimage, fpvectorial;
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function CreateCircle(APage: TvVectorialPage; CtrX, CtrY, R: Double): TvCircle;
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function CreateEllipse(APage: TvVectorialPage; X1, Y1, X2, Y2: Double): TvEllipse;
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function CreateRectangle(APage: TvVectorialPage; X1, Y1, X2, Y2: Double): TvRectangle;
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function CreateRoundedRect(APage: TvVectorialPage; X1, Y1, X2, Y2, RX, RY: Double): TvRectangle;
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function CreatePolygon(APage: TvVectorialPage; const APoints: array of T3DPoint): TvPolygon;
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procedure CreateArc(APage: TvVectorialPage; X1,Y1, X2,Y2, CX,CY, RX, RY, Angle: Double;
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Clockwise: Boolean; out Arc: TPath; out Txt1, Txt2: TvText);
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procedure CreateBezier(APage: TvVectorialPage; X1,Y1, X2,Y2, X3,Y3, X4,Y4: Double;
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out Bezier, Line1, Line2: TPath; out Txt1, Txt2, Txt3, Txt4: TvText);
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function CreateSimpleBrush(AStyle: TFPBrushStyle; AColor: TFPColor): TvBrush; overload;
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function CreateSimpleBrush(AStyle: TFPBrushStyle): TvBrush; overload;
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function CreateLinearGradientBrush(AStartPt, AEndPt: T2DPoint; AFlags: TvGradientFlags;
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AStartColor, AEndColor: TFPColor): TvBrush;
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function CreateRadialGradientBrush(CX, CY, R, FX, FY: Double;
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AStartColor, AEndColor: TFPColor): TvBrush;
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function CreatePen(AStyle: TFPPenStyle; AWidth: Integer; AColor: TFPColor): TvPen;
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function CreateStdCircle(APage: TvVectorialPage): TvCircle;
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function CreateStdEllipse(APage: TvVectorialPage): TvEllipse;
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function CreateStdRect(APage: TvVectorialPage): TvRectangle;
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function CreateStdRoundedRect(APage: TvVectorialPage): TvRectangle;
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function CreateStdPolygon(APage: TvVectorialPage): TvPolygon;
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function CreateStdSelfIntersectingPolygon(APage: TvVectorialPage): TvPolygon;
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function CreatePathWithHole(APage: TvVectorialPage): TPath;
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function StdSolidBrush(AColor: TFPColor): TvBrush;
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function StdHorizGradientBrush(AColor1, AColor2: TFPColor): TvBrush;
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function StdVertGradientBrush(AColor1, AColor2: TFPColor): TvBrush;
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function StdLinearGradientBrush(AColor1, AColor2: TFPColor): TvBrush;
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function StdRadialGradientBrush(AColor1, AColor2: TFPColor; CX, CY, R: Double): TvBrush;
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function StdPen(AColor: TFPColor; AWidth: Integer): TvPen;
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procedure Rotate(APage: TvVectorialPage; AShape: TvEntity; Angle: Double);
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const
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PAGE_SIZE = 100;
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implementation
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uses
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Math, fpvutils;
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{ Shapes }
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{ circle with specified center and radius.
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Valid for any coordinate system }
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function CreateCircle(APage: TvVectorialPage; CtrX, CtrY, R: Double): TvCircle;
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begin
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Result := TvCircle.Create(APage);
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Result.X := CtrX;
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Result.Y := CtrY;
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Result.Radius := R;
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Result.Brush := CreateSimpleBrush(bsClear);
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Result.Pen := CreatePen(psSolid, 1, colBlack);
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end;
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{ Ellipse with specified center and halfaxes.
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Coordinate system uses an upward y axis for input data, but is flipped if needed }
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function CreateEllipse(APage: TvVectorialPage; X1, Y1, X2, Y2: Double): TvEllipse;
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begin
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Result := TvEllipse.Create(APage);
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Result.X := (X1 + X2) / 2; // Center
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Result.Y := (Y1 + Y2) / 2;
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if APage.UseTopLeftCoordinates then
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Result.Y := PAGE_SIZE - Result.Y;
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Result.HorzHalfAxis := abs(X2 - X1) / 2;
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Result.VertHalfAxis := abs(Y2 - Y1) / 2;
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Result.Brush := CreateSimpleBrush(bsClear);
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Result.Pen := CreatePen(psSolid, 1, colBlack);
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end;
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{ Rectangle with specified top/left corner and width and height.
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Coordinate system uses an upward y axis for input data, but is flipped if needed. }
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function CreateRectangle(APage: TvVectorialPage; X1, Y1, X2, Y2: Double): TvRectangle;
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begin
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Result := TvRectangle.Create(APage);
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Result.X := Min(X1, X2);
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if APage.UseTopLeftCoordinates then
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Result.Y := Min(PAGE_SIZE-Y1, PAGE_SIZE-Y2) else
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Result.Y := Max(Y1, Y2);
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Result.CX := abs(X2 - X1); // width
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Result.CY := abs(Y2 - Y1); // height
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Result.Brush := CreateSimpleBrush(bsClear);
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Result.Pen := CreatePen(psSolid, 1, colBlack);
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end;
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{ Rectangle with rounded corner
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Coordinate system uses an upward y axis for input data, but is flipped if needed. }
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function CreateRoundedRect(APage: TvVectorialPage;
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X1, Y1, X2, Y2, RX, RY: Double): TvRectangle;
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begin
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Result := TvRectangle.Create(APage);
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Result.X := Min(X1, X2);
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if APage.UseTopLeftCoordinates then
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Result.Y := Min(PAGE_SIZE-Y1, PAGE_SIZE-Y2) else
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Result.Y := Max(Y1, Y2);
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Result.CX := abs(X2 - X1);
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Result.CY := abs(Y2 - Y1);
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Result.RX := RX;
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Result.RY := RY;
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Result.Brush := CreateSimpleBrush(bsClear);
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Result.Pen := CreatePen(psSolid, 1, colBlack);
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end;
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{ Polygon with vertices specified in the array.
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Valid for any coordinate system. }
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function CreatePolygon(APage: TvVectorialPage;
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const APoints: Array of T3DPoint): TvPolygon;
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var
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i: Integer;
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begin
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Result := TvPolygon.Create(APage);
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SetLength(Result.Points, Length(APoints));
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for i:=0 to High(APoints) do
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Result.Points[i] := APoints[i];
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Result.X := Result.Points[0].X;
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Result.Y := Result.Points[0].Y;
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Result.Brush := CreateSimpleBrush(bsClear);
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Result.Pen := CreatePen(psSolid, 1, colBlack);
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end;
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procedure CreateArc(APage: TvVectorialPage; X1,Y1, X2,Y2, CX,CY, RX, RY, Angle: Double;
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Clockwise: Boolean; out Arc: TPath; out Txt1, Txt2: TvText);
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begin
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if APage.UseTopLeftCoordinates then begin
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Y1 := PAGE_SIZE - Y1;
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Y2 := PAGE_SIZE - Y2;
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CY := PAGE_SIZE - CY;
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Angle := -Angle;
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end;
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// Don't invert "Clockwise" here. It does not matter where the y axis points to.
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APage.StartPath(X1, Y1);
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APage.AddEllipticalArcWithCenterToPath(RX, RY, Angle, X2, Y2, CX, CY, Clockwise);
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Arc := APage.EndPath;
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Arc.Pen := StdPen(colBlack, 4);
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Txt1 := TvText.Create(APage);
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Txt1.Value.Add('1');
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Txt1.X := X1;
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Txt1.Y := Y1;
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Txt1.Font.Color := colRed;
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APage.AddEntity(Txt1);
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Txt2 := TvText.Create(APage);
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Txt2.Value.Add('2');
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Txt2.X := X2;
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Txt2.Y := Y2;
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Txt2.Font.Color := colRed;
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APage.AddEntity(Txt2);
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end;
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procedure CreateBezier(APage: TvVectorialPage;
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X1,Y1, X2,Y2, X3,Y3, X4,Y4: Double;
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out Bezier, Line1, Line2: TPath; out Txt1, Txt2, Txt3, Txt4: TvText);
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var
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txt: TvText;
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begin
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if APage.UseTopLeftCoordinates then begin
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Y1 := PAGE_SIZE - Y1;
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Y2 := PAGE_SIZE - Y2;
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Y3 := PAGE_SIZE - Y3;
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Y4 := PAGE_SIZE - Y4;
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end;
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APage.StartPath(X1, Y1);
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APage.AddBezierToPath(X2,Y2, X3,Y3, X4,Y4);
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Bezier := APage.EndPath;
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Bezier.Pen := StdPen(colBlack, 4);
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APage.StartPath(X1, Y1);
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APage.AddLineToPath(X2, Y2);
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Line1 := APage.EndPath;
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Line1.Pen.Color := colRed;
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Line1.Name := 'Line1';
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APage.StartPath(X4, Y4);
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APage.AddLineToPath(X3, Y3);
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Line2 := APage.EndPath;
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Line2.Pen.Color := colRed;
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Line2.Name := 'Line2';
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Txt1 := TvText.Create(APage);
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Txt1.Value.Add('1');
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Txt1.X := X1;
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Txt1.Y := Y1;
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Txt1.Font.Color := colRed;
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APage.AddEntity(Txt1);
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Txt2 := TvText.Create(APage);
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Txt2.Value.Add('2');
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Txt2.X := X2;
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Txt2.Y := Y2;
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Txt2.Font.Color := colRed;
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APage.AddEntity(Txt2);
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Txt3 := TvText.Create(APage);
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Txt3.Value.Add('3');
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Txt3.X := X3;
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Txt3.Y := Y3;
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Txt3.Font.Color := colRed;
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APage.AddEntity(Txt3);
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Txt4 := TvText.Create(APage);
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Txt4.Value.Add('4');
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Txt4.X := X4;
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Txt4.Y := Y4;
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Txt4.Font.Color := colRed;
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APage.AddEntity(Txt4);
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end;
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{ Brushes }
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function CreateSimpleBrush(AStyle: TFPBrushStyle): TvBrush;
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begin
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Result := CreateSimpleBrush(AStyle, colBlack);
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end;
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function CreateSimpleBrush(AStyle: TFPBrushStyle; AColor: TFPColor): TvBrush;
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begin
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Result.Kind := bkSimpleBrush;
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Result.Color := TFPColor(AColor);
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Result.Style := AStyle;
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end;
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function CreateLinearGradientBrush(AStartPt, AEndPt: T2DPoint;
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AFlags: TvGradientFlags; AStartColor, AEndColor: TFPColor): TvBrush;
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var
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p1, p2: T2dPoint;
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x1str, x2str, y1str, y2str: String;
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begin
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if AStartPt.Y = AEndPt.Y then
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Result.Kind := bkHorizontalGradient
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else if AStartPt.X = AEndPt.X then
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Result.Kind := bkVerticalGradient
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else
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Result.Kind := bkOtherLinearGradient;
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Result.Gradient_start := AStartPt;
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Result.Gradient_end := AEndPt;
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Result.Gradient_flags := AFlags;
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SetLength(Result.Gradient_colors, 2);
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Result.Gradient_colors[0].Color := AStartColor;
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Result.Gradient_colors[0].Position := 0;
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Result.Gradient_colors[1].Color := AEndColor;
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Result.Gradient_colors[1].Position := 1;
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end;
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function CreateRadialGradientBrush(CX, CY, R, FX, FY: Double;
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AStartColor, AEndColor: TFPColor): TvBrush;
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begin
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Result.Kind := bkRadialGradient;
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Result.Gradient_cx := CX;
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Result.Gradient_cy := CY;
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Result.Gradient_r := R;
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// Our renderer does not support a moving center --> put both centers at the same spot
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Result.Gradient_fx := CX;
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Result.Gradient_fy := CY;
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Result.Gradient_cx_Unit := vcuPercentage;
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Result.Gradient_cy_Unit := vcuPercentage;
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Result.Gradient_r_Unit := vcuPercentage;
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Result.Gradient_fx_Unit := vcuPercentage;
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Result.Gradient_fy_Unit := vcuPercentage;
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SetLength(Result.Gradient_colors, 2);
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Result.Gradient_colors[0].Color := AStartColor;
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Result.Gradient_colors[0].Position := 0;
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Result.Gradient_colors[1].Color := AEndColor;
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Result.Gradient_colors[1].Position := 1;
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end;
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(*
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function CreateRadialGradientBrush(CX, CY, R, FX, FY: Double;
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AStartColor, AEndColor: TFPColor): TvBrush;
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begin
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Result.Kind := bkRadialGradient;
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Result.Gradient_cx := CX;
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Result.Gradient_cy := CY;
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Result.Gradient_r := R;
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Result.Gradient_fx := FX;
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Result.Gradient_fy := FY;
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SetLength(Result.Gradient_colors, 2);
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Result.Gradient_colors[0].Color := AStartColor;
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Result.Gradient_colors[0].Position := 0;
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Result.Gradient_colors[1].Color := AEndColor;
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Result.Gradient_colors[1].Position := 1;
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end; *)
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{ Pen }
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function CreatePen(AStyle: TFPPenStyle; AWidth: Integer; AColor: TFPColor): TvPen;
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begin
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Result.Style := AStyle;
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Result.Width := AWidth;
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Result.Color := AColor;
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end;
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{ Standardized objects }
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{ A circle shifted up }
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function CreateStdCircle(APage: TvVectorialPage): TvCircle;
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const
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CENTER_X = 50;
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CENTER_Y = 55; // y points up for this number
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RADIUS = 40;
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begin
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if APage.UseTopLeftCoordinates then
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Result := CreateCircle(APage, CENTER_X, PAGE_SIZE - CENTER_Y, RADIUS)
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else
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Result := CreateCircle(APage, CENTER_X, CENTER_Y, RADIUS);
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Result.Pen := StdPen(colBlack, 4);
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end;
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{ An ellipse shifted up }
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function CreateStdEllipse(APage: TvVectorialPage): TvEllipse;
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begin
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Result := CreateEllipse(APage, 10, 30, 90, 80);
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// CreateEllipse will invert the axis if needed
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Result.Pen := StdPen(colBlack, 4);
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end;
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{ A rectangle shifted up }
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function CreateStdRect(APage: TvVectorialPage): TvRectangle;
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const
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LEFT = 10;
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RIGHT = 90;
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TOP = 95; // for bottom-up y axis
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BOTTOM = 15; // dto.
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begin
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Result := CreateRectangle(APage, LEFT, TOP, RIGHT, BOTTOM);
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// CreateRect will invert the y axis if needed
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Result.Pen := StdPen(colBlack, 4);
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end;
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{ A rounded rectangle shifted up }
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function CreateStdRoundedRect(APage: TvVectorialPage): TvRectangle;
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const
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LEFT = 10;
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RIGHT = 90;
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TOP = 95; // for bottom-up y axis
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BOTTOM = 15; // dto.
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RX = 10;
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RY = 10;
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begin
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Result := CreateRoundedRect(APage,LEFT, TOP, RIGHT, BOTTOM, RX, RY);
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// CreateRect will invert the y axis if needed
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Result.Pen := StdPen(colBlack, 4);
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end;
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{ A triangle as polygon, base line at bottom }
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function CreateStdPolygon(APage: TvVectorialPage):TvPolygon;
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var
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pts: array[0..3] of T3DPoint;
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i: Integer;
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begin
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pts[0] := Make3DPoint(10, 10);
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pts[1] := Make3dPoint(90, 10);
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pts[2] := Make3DPoint(50, 90);
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pts[3] := pts[0];
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if APage.UseTopLeftCoordinates then
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for i:=0 to High(pts) do
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pts[i].Y := PAGE_SIZE - pts[i].Y;
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Result := CreatePolygon(APage, pts);
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Result.Pen := StdPen(colBlack, 4);
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end;
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{ A star-like self-intersecting polygon, tip at bottom }
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function CreateStdSelfIntersectingPolygon(APage: TvVectorialPage): TvPolygon;
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var
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pts: array[0..5] of T3DPoint;
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i: Integer;
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begin
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pts[0] := Make3DPoint(50, 5);
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pts[1] := Make3DPoint(20, 90);
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pts[2] := Make3DPoint(95, 30);
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pts[3] := Make3DPoint(5, 30);
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pts[4] := Make3DPoint(80, 90);
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pts[5] := Make3DPoint(50, 5);
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if APage.UseTopLeftCoordinates then
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for i:=0 to High(pts) do
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pts[i].Y := PAGE_SIZE - pts[i].Y;
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Result := CreatePolygon(APage, pts);
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Result.Pen := StdPen(colBlack, 4);
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end;
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function CreatePathWithHole(APage: TvVectorialPage): TPath;
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const
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OUTER_POINTS: array[0..4] of T2DPoint = (
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(X:10; Y:5), (X:90; Y:5), (X:90; Y:90), (X:10; Y:90), (X:10; Y:5)
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);
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INNER_POINTS: array[0..4] of T2DPoint = (
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(X:50; Y:45), (X:40; Y:55), (X:50; Y:65), (X:60; Y:55), (X:50; Y:45)
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);
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var
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i: Integer;
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begin
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if APage.UseTopLeftCoordinates then begin
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APage.StartPath(OUTER_POINTS[0].X, PAGE_SIZE - OUTER_POINTS[0].Y);
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for i:=1 to High(OUTER_POINTS) do
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APage.AddLineToPath(OUTER_POINTS[i].X, PAGE_SIZE - OUTER_POINTS[i].Y);
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APage.AddMoveToPath(INNER_POINTS[0].X, PAGE_SIZE - INNER_POINTS[0].Y);
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for i:=1 to High(INNER_POINTS) do
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APage.AddLineToPath(INNER_POINTS[i].X, PAGE_SIZE - INNER_POINTS[i].Y);
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end else begin
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APage.StartPath(OUTER_POINTS[0].X, OUTER_POINTS[0].Y);
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for i:=1 to High(OUTER_POINTS) do
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APage.AddLineToPath(OUTER_POINTS[i].X, OUTER_POINTS[i].Y);
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APage.AddMoveToPath(INNER_POINTS[0].X, INNER_POINTS[0].Y);
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for i:=1 to High(INNER_POINTS) do
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APage.AddLineToPath(INNER_POINTS[i].X, INNER_POINTS[i].Y);
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end;
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Result := APage.EndPath;
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Result.Pen := StdPen(colBlack, 4);
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end;
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{ ---- }
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function StdSolidBrush(AColor: TFPColor): TvBrush;
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begin
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Result := CreateSimpleBrush(bsSolid, AColor);
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end;
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function StdHorizGradientBrush(AColor1, AColor2: TFPColor): TvBrush;
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begin
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Result := CreateLinearGradientBrush(Point2D(0, 0), Point2D(1, 0),
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[gfRelStartX, gfRelEndX, gfRelStartY, gfRelEndY],
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AColor1, AColor2);
|
|
end;
|
|
|
|
{ A vertical gradient, AColor1 at top, AColor2 at bottom }
|
|
function StdVertGradientBrush(AColor1, AColor2: TFPColor): TvBrush;
|
|
var
|
|
P1, P2: T2DPoint;
|
|
begin
|
|
P1 := Point2D(0, 0);
|
|
P2 := Point2D(0, 1);
|
|
Result := CreateLinearGradientBrush(P1, P2,
|
|
[gfRelStartX, gfRelEndX, gfRelStartY, gfRelEndY],
|
|
AColor1, AColor2);
|
|
end;
|
|
|
|
{ A diagonal gradient running from bottom/left (AColor1) to top/right (AColor) }
|
|
function StdLinearGradientBrush(AColor1, AColor2: TFPColor): TvBrush;
|
|
var
|
|
P1, P2: T2DPoint;
|
|
begin
|
|
P1 := Point2D(0, 0);
|
|
P2 := Point2D(1, 1);
|
|
Result := CreateLinearGradientBrush(Point2D(0, 0), Point2D(1, 1),
|
|
[gfRelStartX, gfRelEndX, gfRelStartY, gfRelEndY],
|
|
AColor1, AColor2);
|
|
end;
|
|
|
|
function StdRadialGradientBrush(AColor1, AColor2: TFPColor;
|
|
CX, CY, R: Double): TvBrush;
|
|
begin
|
|
Result := CreateRadialGradientBrush(CX, CY, R, 0.5, 0.5,
|
|
AColor1, AColor2);
|
|
end;
|
|
|
|
function StdPen(AColor: TFPColor; AWidth: Integer): TvPen;
|
|
begin
|
|
Result := CreatePen(psSolid, AWidth, AColor);
|
|
end;
|
|
|
|
procedure Rotate(APage: TvVectorialPage; AShape: TvEntity; Angle: Double);
|
|
var
|
|
p: T3dPoint;
|
|
ctr: T3dPoint; // Center of rotation
|
|
phi: Double; // Rotation angle in radians
|
|
begin;
|
|
ctr.X := 10;
|
|
phi := DegToRad(Angle);
|
|
if APage.UseTopLeftCoordinates then
|
|
begin
|
|
ctr.Y := PAGE_SIZE - 10;
|
|
phi := -phi;
|
|
end else
|
|
ctr.Y := 10;
|
|
|
|
if AShape is TvText then
|
|
begin
|
|
// TvText has no Rotate method since it has no Angle element.
|
|
// --> The reference point cannot be rotated in space by TvText itself,
|
|
// we must do it separately.
|
|
p := Rotate3DPointInXY(Make3dPoint(AShape.X, AShape.Y), ctr, -phi);
|
|
AShape.X := p.X;
|
|
AShape.Y := p.Y;
|
|
end else
|
|
AShape.Rotate(phi, ctr);
|
|
end;
|
|
|
|
end.
|
|
|