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:\Temp\DX.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.