Delphi 与 DirectX 之 DelphiX(79): TDIB.LinePolar();

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);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



procedure TForm1.FormCreate(Sender: TObject);

const

  ImgPath1 = 'C:\Temp\DX.jpg';

var

  r: Real;

begin

  DXPaintBox1.DIB.LoadFromFile(ImgPath1);

  DXPaintBox1.Width := DXPaintBox1.DIB.Width;

  DXPaintBox1.Height := DXPaintBox1.DIB.Height;



  r := 0;

  while r < 90 do

  begin

    DXPaintBox1.DIB.LinePolar(0, 0, r, DXPaintBox1.Width, clRed);

    r := r + 5;

  end;

end;



end.