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; 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.