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

本例效果圖:

　　代碼文件:

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 是負片效果, 如果超過 8 位色, 這個方法有些問題}
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.