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

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;

    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:\Temp\DX.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.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 142

  ClientWidth = 226

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'Tahoma'

  Font.Style = []

  OldCreateOrder = False

  OnCreate = FormCreate

  OnDestroy = FormDestroy

  PixelsPerInch = 96

  TextHeight = 13

  object DXPaintBox1: TDXPaintBox

    Left = 8

    Top = 8

    Width = 81

    Height = 73

    AutoStretch = False

    Center = False

    KeepAspect = False

    Stretch = False

    ViewWidth = 0

    ViewHeight = 0

  end

  object Button1: TButton

    Left = 143

    Top = 101

    Width = 75

    Height = 25

    Caption = 'Button1'

    TabOrder = 0

    OnClick = Button1Click

  end

end