Delphi 与 DirectX 之 DelphiX(94): TDIB.DrawAdditive();

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;

    Button2: TButton;

    Button3: TButton;

    Button4: TButton;

    procedure FormCreate(Sender: TObject);

    procedure FormDestroy(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

    procedure Button1Click(Sender: TObject);

    procedure Button4Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



var

  dib: TDIB;



procedure TForm1.FormCreate(Sender: TObject);

const

  ImgPath1 = 'C:\Temp\test.bmp';

begin

  Position := poScreenCenter;

  dib := TDIB.Create;

  dib.LoadFromFile(ImgPath1);

  DXPaintBox1.Width := dib.Width;

  DXPaintBox1.Height := dib.Height;

end;



procedure TForm1.FormDestroy(Sender: TObject);

begin

  dib.Free;

end;



procedure TForm1.Button1Click(Sender: TObject);

begin

  DXPaintBox1.DIB.Assign(dib);

  DXPaintBox1.Repaint;

end;



procedure TForm1.Button2Click(Sender: TObject);

begin

  DXPaintBox1.DIB.Fill(clWhite);

  DXPaintBox1.DIB.DrawAdditive(dib, 0, 0, dib.Width, dib.Height, 1);

  DXPaintBox1.Repaint;

end;



procedure TForm1.Button3Click(Sender: TObject);

begin

  DXPaintBox1.DIB.Fill(clWhite);

  DXPaintBox1.DIB.DrawAdditive(dib, 0, 0, dib.Width, dib.Height, 128);

  DXPaintBox1.Repaint;

end;



procedure TForm1.Button4Click(Sender: TObject);

begin

  DXPaintBox1.DIB.Fill(clBlack);

  DXPaintBox1.DIB.DrawAdditive(dib, 0, 0, dib.Width, dib.Height, 128);

  DXPaintBox1.Repaint;

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 204

  ClientWidth = 253

  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 = 8

    Top = 174

    Width = 56

    Height = 25

    Caption = 'Button1'

    TabOrder = 0

    OnClick = Button1Click

  end

  object Button2: TButton

    Left = 68

    Top = 174

    Width = 56

    Height = 25

    Caption = 'Button2'

    TabOrder = 1

    OnClick = Button2Click

  end

  object Button3: TButton

    Left = 129

    Top = 174

    Width = 56

    Height = 25

    Caption = 'Button3'

    TabOrder = 2

    OnClick = Button3Click

  end

  object Button4: TButton

    Left = 190

    Top = 174

    Width = 56

    Height = 25

    Caption = 'Button4'

    TabOrder = 3

    OnClick = Button4Click

  end

end