Delphi 与 DirectX 之 DelphiX(71): TDIB.Negative;

本例效果图:

---

代码文件:

---

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, DIB, StdCtrls;



type

  TForm1 = class(TForm)

    DXPaintBox1: TDXPaintBox;

    Button1: TButton;

    Button2: TButton;

    Button3: TButton;

    Button4: TButton;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

    procedure Button4Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



procedure TForm1.Button1Click(Sender: TObject);

const

  ImgPath1 = 'C:\Temp\DX.jpg';

begin

  DXPaintBox1.DIB.LoadFromFile(ImgPath1);

  DXPaintBox1.Width := DXPaintBox1.DIB.Width;

  DXPaintBox1.Height := DXPaintBox1.DIB.Height;

  DXPaintBox1.Repaint;

end;



{Negative 是负片效果, 如果超过 8 位色, 这个方法有些问题}

procedure TForm1.Button2Click(Sender: TObject);

begin

  DXPaintBox1.DIB.BitCount := 8;

  DXPaintBox1.DIB.Negative;

  DXPaintBox1.Repaint;

end;



procedure TForm1.Button3Click(Sender: TObject);

begin

  DXPaintBox1.DIB.BitCount := 4;

  DXPaintBox1.DIB.Negative;

  DXPaintBox1.Repaint;

end;



procedure TForm1.Button4Click(Sender: TObject);

begin

  DXPaintBox1.DIB.BitCount := 1;

  DXPaintBox1.DIB.Negative;

  DXPaintBox1.Repaint;

end;



end.