WinAPI: PathToRegion - 将路径转换为区域

本例效果图:

---

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs;



type

  TForm1 = class(TForm)

    procedure FormPaint(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



procedure TForm1.FormPaint(Sender: TObject);

const

  str = 'Delphi';

var

  Rgn: HRGN;

  x,y: Integer;

begin

  Canvas.Font.Size := 68;

  Canvas.Font.Style := [fsBold];

  SetBkMode(Canvas.Handle, TRANSPARENT);



  x := (ClientWidth - Canvas.TextWidth(str)) div 2;

  y := (ClientHeight - Canvas.TextHeight(str)) div 3;



  {建立路径}

  BeginPath(Canvas.Handle);

  Canvas.TextOut(x, y, str);

  EndPath(Canvas.Handle);



  {将路径转换为区域}

  Rgn := PathToRegion(Canvas.Handle);



  {绘制}

  Canvas.Brush.Color := clSilver;

  Canvas.Brush.Style := bsDiagCross;

  FillRgn(Canvas.Handle, Rgn, Canvas.Brush.Handle);

  Canvas.Brush.Color := clRed;

  Canvas.Brush.Style := bsSolid;

  FrameRgn(Canvas.Handle, Rgn, Canvas.Brush.Handle, 1, 1);



  DeleteObject(Rgn);

end;



end.