Delphi 与 DirectX 之 DelphiX(86): TDIB.DrawOn();

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;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure DXPaintBox1MouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

var
  dib: TDIB;

procedure TForm1.DXPaintBox1MouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  DXPaintBox1.DIB.Fill(clGray);
  dib.DrawOn(dib.ClientRect, DXPaintBox1.DIB.Canvas, -X, -Y);
  DXPaintBox1.Repaint;
end;

procedure TForm1.FormCreate(Sender: TObject);
const
  ImgPath1 = 'C:\Temp\DX.jpg';
begin
  dib := TDIB.Create;
  dib.LoadFromFile(ImgPath1);
  DXPaintBox1.Width := dib.Width;
  DXPaintBox1.Height := dib.Height;
  DXPaintBox1.DIB.SetSize(dib.Width, dib.Height, 24);
  DXPaintBox1.DIB.Fill(clGray);
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 = 163
  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
    OnMouseUp = DXPaintBox1MouseUp
  end
end