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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[74]: 區域(3) - IsVisible

再學GDI+[74]: 區域(3) - IsVisible

編輯:Delphi

本例效果圖:

代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls, ExtCtrls;
type
 TForm1 = class(TForm)
  procedure FormPaint(Sender: TObject);
  procedure FormCreate(Sender: TObject);
  procedure FormDestroy(Sender: TObject);
  procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var rgn: TGPRegion;
procedure TForm1.FormCreate(Sender: TObject);
var
 rt: TRect;
 path: TGPGraphicsPath;
begin
 rt := ClientRect;
 InflateRect(rt, -20, -20);
 {建立區域}
 rgn := TGPRegion.Create(MakeRect(rt));
 {建立路徑}
 InflateRect(rt, -2, -2);
 path := TGPGraphicsPath.Create;
 path.AddEllipse(MakeRect(rt));
 {從區域中減去路徑}
 rgn.Exclude(path);
 path.Free;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
 rgn.Free;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 b: TGPBrush;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 b := TGPHatchBrush.Create(HatchStyleMin, aclSilver, aclRed);
 g.FillRegion(b, rgn);
 b.Free;
 g.Free;
end;
procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X,
 Y: Integer);
begin
 Text := 'Form1';
 if rgn.IsVisible(X, Y) then Text := '在區域中';
end;
end.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 129
 ClientWidth = 177
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poDesktopCenter
 OnCreate = FormCreate
 OnDestroy = FormDestroy
 OnMouseMove = FormMouseMove
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
end

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