BGRABitmap图像操作8：轴向的木质纹理

unit Unit1;{$mode objfpc}{$H+}interfaceuses  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs,  BGRABitmap, BGRABitmapTypes, BGRAGradients, math;type  { TForm1 }  TForm1 = class(TForm)    procedure FormPaint(Sender: TObject);  private    { private declarations }  public    { public declarations }  end;var  Form1: TForm1;implementation{$R *.lfm}{ TForm1 }function Interp256(value1,value2,position: integer): integer; inline;begin     result := (value1*(256-position) + value2*position) shr 8;end;function Interp256(color1,color2: TBGRAPixel; position: integer): TBGRAPixel; inline;begin     result.red := Interp256(color1.red,color2.red, position);     result.green := Interp256(color1.green,color2.green, position);     result.blue := Interp256(color1.blue,color2.blue, position);     result.alpha := Interp256(color1.alpha,color2.alpha, position);end;function CreateWoodTexture(tx,ty: integer): TBGRABitmap;var  colorOscillation, globalColorVariation: integer;  p: PBGRAPixel;  i: Integer;begin  result := CreateCyclicPerlinNoiseMap(tx,ty);  p := result.Data;  for i := 0 to result.NbPixels-1 do  begin    colorOscillation := round(sqrt((sin(p^.red*Pi/16)+1)/2)*256);    globalColorVariation := p^.red;    p^:= Interp256( Interp256(BGRA(247,188,120),BGRA(255,218,170),colorOscillation),                    Interp256(BGRA(157,97,60),BGRA(202,145,112),colorOscillation), globalColorVariation);    inc(p);  end;end;function CreateVerticalWoodTexture(tx,ty: integer): TBGRABitmap;var  globalPos: single;  colorOscillation, globalColorVariation: integer;  p: PBGRAPixel;  i: Integer;  x: integer;begin  result := CreateCyclicPerlinNoiseMap(tx,ty);  p := result.Data;  x := 0;  for i := 0 to result.NbPixels-1 do  begin    globalPos := p^.red*Pi/32+x*2*Pi/tx*8;    colorOscillation := round(sqrt((sin(globalPos)+1)/2)*256);    globalColorVariation := round(sin(globalPos/8)*128+128);    p^:= Interp256( Interp256(BGRA(247,188,120),BGRA(255,218,170),colorOscillation),                    Interp256(BGRA(157,97,60),BGRA(202,145,112),colorOscillation), globalColorVariation);    inc(p);    inc(x);    if x = tx then x := 0;  end;end;procedure TForm1.FormPaint(Sender: TObject);var  image,tex: TBGRABitmap;begin    image := TBGRABitmap.Create(ClientWidth,ClientHeight,ColorToBGRA(ColorToRGB(clBtnFace)));    tex := CreateVerticalWoodTexture(100,100);    image.FillRoundRectAntialias(20,20,300,200,20,20,tex);    image.RoundRectAntialias(20,20,300,200,20,20,BGRABlack,1);    tex.free;    image.Draw(Canvas,0,0,True);    image.free;end;end.