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

本例效果图:

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代码文件:

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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.