Delphi与DirectX之DelphiX（83）: TDIB.FilterLine（）、FilterRect（）;

Delphi与DirectX之DelphiX（83）: TDIB.FilterLine（）、FilterRect（）;2010-11-08 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;
   procedure FormCreate（Sender: TObject）;
   procedure FormDestroy（Sender: TObject）;
   procedure Button1Click（Sender: TObject）;
  end;
var
  Form1: TForm1;
implementation
{$R *.dfm}
uses TypInfo;
var
  dib: TDIB;
  f: Integer;
procedure TForm1.Button1Click（Sender: TObject）;
const
  clr = clRed;
var
  w,h,a,b: Integer;
begin
  DXPaintBox1.DIB.Assign（dib）;
  w := DXPaintBox1.ClientWidth;
  h := DXPaintBox1.ClientHeight;
  a := w div 7;
  b := h div 7;
  DXPaintBox1.DIB.FilterLine（0, b, w, b, clr, TFilterMode（f））;
  DXPaintBox1.DIB.FilterLine（0, h-b, w, h-b, clr, TFilterMode （f））;
  DXPaintBox1.DIB.FilterLine（a, 0, a, h, clr, TFilterMode（f））;
  DXPaintBox1.DIB.FilterLine（w-a, 0, w-a, h, clr, TFilterMode （f））;
  DXPaintBox1.DIB.FilterRect（w div 5, h div 5, w div 5*3, h div 5*3, clr, TFilterMode（f））;
  DXPaintBox1.Repaint;
  Text := GetEnumName（TypeInfo（TFilterMode）, f）;
  Inc（f）; f := f and 3;
end;
procedure TForm1.FormCreate（Sender: TObject）;
const
  ImgPath1 = "C:TempDX.jpg";
begin
  dib := TDIB.Create;
  dib.LoadFromFile（ImgPath1）;
  DXPaintBox1.DIB.Assign（dib）;
  DXPaintBox1.Width := dib.Width;
  DXPaintBox1.Height := dib.Height;
  DXPaintBox1.Repaint;
end;
procedure TForm1.FormDestroy（Sender: TObject）;
begin
  dib.Free;
end;
end.