Delphi 与 DirectX 之 DelphiX(80): TDIB.BlendPixel();

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;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(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;



procedure TForm1.Button2Click(Sender: TObject);

var

  w,h,i: Integer;

begin

  w := DXPaintBox1.DIB.Width;

  h := DXPaintBox1.DIB.Height;



  for i := 0 to 9999 do begin

    DXPaintBox1.DIB.BlendPixel(Random(w), Random(h div 2), clRed, 255);

    DXPaintBox1.DIB.BlendPixel(Random(w), Random(h div 2) + (h div 2), clRed, 64);

  end;

  DXPaintBox1.Repaint;

end;



end.