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

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;
　　 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.