BGRABitmap图像操作11：前面组合变形再结合扭曲

unit Unit1;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs,
  BGRABitmap, BGRABitmapTypes, BGRAGradientScanner, BGRATransform;

type

  { TForm1 }

  TForm1 = class(TForm)
    procedure FormPaint(Sender: TObject);
  private
    { private declarations }
  public
    { public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.lfm}

{ TForm1 }

procedure TForm1.FormPaint(Sender: TObject);
var image: TBGRABitmap;
    grad: TBGRAGradientScanner;
    affine: TBGRAAffineScannerTransform;
    twirl: TBGRATwirlScanner;
begin
  image := TBGRABitmap.Create(ClientWidth,ClientHeight, BGRABlack );

  grad := TBGRAGradientScanner.Create(BGRA(0,0,255),BGRAWhite,gtRadial,PointF(0,0),PointF(1,0),True,True);

  affine := TBGRAAffineScannerTransform.Create(grad);
  affine.Scale(150,80);
  affine.RotateDeg(-30);
  affine.Translate(ClientWidth/2, ClientHeight/2);

  twirl := TBGRATwirlScanner.Create(affine,Point(ClientWidth div 2, ClientHeight div 2),100);
  image.Fill(twirl);
  twirl.Free;

  affine.free;
  grad.free;

  image.Draw(Canvas,0,0,True);
  image.free;

end;

end.