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

Delphi与DirectX之DelphiX（71）: TDIB.Negative;2010-11-07 博客园万一本例效果图:

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:TempDX.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.