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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> WinAPI: OffsetClipRgn、PtVisible

WinAPI: OffsetClipRgn、PtVisible

編輯:Delphi

OffsetClipRgn: 移動剪切區域; PtVisible: 判斷點是否在剪切區域中.

  本例效果圖:

WinAPI: OffsetClipRgn、PtVisible

  代碼文件:

unit Unit1; 
 
interface 
 
uses 
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, 
 Dialogs; 
 
type 
 TForm1 = class(TForm) 
  procedure FormCreate(Sender: TObject); 
  procedure FormDestroy(Sender: TObject); 
  procedure FormMouseDown(Sender: TObject; Button: TMouseButton; 
   Shift: TShiftState; X, Y: Integer); 
  procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer); 
  procedure FormMouseUp(Sender: TObject; Button: TMouseButton; 
   Shift: TShiftState; X, Y: Integer); 
  procedure FormPaint(Sender: TObject); 
 end; 
 
var 
 Form1: TForm1; 
 
implementation 
 
{$R *.dfm} 
 
var 
 bit: TBITMAP; 
 f: Boolean; 
 x1,y1: Integer; 
 cvs: TCanvas; 
 
procedure TForm1.FormCreate(Sender: TObject); 
var 
 Rgn: HRGN; 
begin 
 bit := TBitmap.Create; 
 bit.LoadFromFile('c:\temp\Test.bmp'); 
 ClIEntWidth := bit.Width; 
 ClIEntHeight := bit.Height; 
 
 cvs := TCanvas.Create; 
 cvs.Handle := GetDC(Handle); 
 
 Rgn := CreateEllipticRgn(30,30,140,140); 
 SelectClipRgn(cvs.Handle, Rgn); 
 
 DeleteObject(Rgn); 
end; 
 
procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton; 
 Shift: TShiftState; X, Y: Integer); 
begin 
 if PtVisible(cvs.Handle, X, Y) then 
 begin 
  f := True; 
  x1 := X; 
  y1 := Y; 
 end; 
end; 
 
procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X, 
 Y: Integer); 
begin 
 if not f then Exit; 
 OffsetClipRgn(cvs.Handle, X-x1, Y-Y1); 
 Repaint; 
 x1 := X; 
 y1 := Y; 
end; 
 
procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton; 
 Shift: TShiftState; X, Y: Integer); 
begin 
 f := False; 
end; 
 
procedure TForm1.FormPaint(Sender: TObject); 
begin 
 cvs.Draw(0,0,bit); 
end; 
 
procedure TForm1.FormDestroy(Sender: TObject); 
begin 
 bit.Free; 
 cvs.Free; 
end; 
 
end. 

  窗體文件:

object Form1: TForm1 
 Left = 402 
 Top = 230 
 Caption = 'Form1' 
 ClIEntHeight = 206 
 ClIEntWidth = 339 
 Color = clBtnFace 
 Font.Charset = DEFAULT_CHARSET 
 Font.Color = clWindowText 
 Font.Height = -11 
 Font.Name = 'Tahoma' 
 Font.Style = [] 
 OldCreateOrder = False 
 Position = poDesigned 
 OnCreate = FormCreate 
 OnDestroy = FormDestroy 
 OnMouseDown = FormMouseDown 
 OnMouseMove = FormMouseMove 
 OnMouseUp = FormMouseUp 
 OnPaint = FormPaint 
 PixelsPerInch = 96 
 TextHeight = 13 
end 


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