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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> WinAPI: ExtCreateRegion - 區域變換

WinAPI: ExtCreateRegion - 區域變換

編輯:Delphi
代碼文件:

unit Unit1; 
 
interface 
 
uses 
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, 
 Dialogs, StdCtrls, ExtCtrls; 
 
type 
 TForm1 = class(TForm) 
  RadioGroup1: TRadioGroup; 
  procedure FormCreate(Sender: TObject); 
  procedure FormPaint(Sender: TObject); 
  procedure RadioGroup1Click(Sender: TObject); 
  procedure FormDestroy(Sender: TObject); 
 end; 
 
var 
 Form1: TForm1; 
 
implementation 
 
{$R *.dfm} 
 
var 
 cvs: TCanvas; 
 Rgn: HRGN; 
 
procedure TForm1.FormCreate(Sender: TObject); 
begin 
 cvs := TCanvas.Create; 
 cvs.Handle := GetDC(Handle); 
 
 RadioGroup1.Items.CommaText := 
 '原始,橫向移動,縱向移動,橫向比例,縱向比例,放大,縮小,水平鏡像,垂直鏡像,橫向斜切,縱向斜切,旋轉'; 
 RadioGroup1.ItemIndex := 0; 
end; 
 
procedure TForm1.FormDestroy(Sender: TObject); 
begin 
 DeleteObject(Rgn); 
 cvs.Free; 
end; 
 
procedure TForm1.FormPaint(Sender: TObject); 
begin 
 {繪制} 
 cvs.Brush.Color := clSilver; 
 cvs.Brush.Style := bsDiagCross; 
 FillRgn(cvs.Handle, Rgn, cvs.Brush.Handle); 
 cvs.Brush.Color := clRed; 
 cvs.Brush.Style := bsSolid; 
 FrameRgn(cvs.Handle, Rgn, cvs.Brush.Handle, 2, 2); 
end; 

procedure TForm1.RadioGroup1Click(Sender: TObject); 
var 
 RgnDataSize: Integer; {區域數據緩沖區的大小} 
 RgnData: PRgnData;  {區域數據指針} 
 TXF: TXForm;     {坐標轉換的矩陣結構} 
begin 
 cvs.Font.Size := 120; 
 cvs.Font.Style := [fsBold]; 
 SetBkMode(cvs.Handle, TRANSPARENT); 
 
 {建立路徑} 
 BeginPath(cvs.Handle); 
 cvs.TextOut(100, 0, 'F'); 
 EndPath(cvs.Handle); 
 
 {將路徑轉換為區域} 
 Rgn := PathToRegion(cvs.Handle); 
 
 {獲取區域數據} 
 RgnDataSize := GetRegionData(Rgn, 0, nil); 
 GetMem(RgnData, RgnDataSize); 
 GetRegionData(Rgn, RgnDataSize, RgnData); 
 
 case RadioGroup1.ItemIndex of 
  0: begin {原始效果, 無變換} 
   TXF.eM11 := 1; 
   TXF.eM12 := 0; 
   TXF.eM21 := 0; 
   TXF.eM22 := 1; 
   TXF.eDx := 0; 
   TXF.eDy := 0; 
  end; 
  1: begin {右移 100} 
   TXF.eM11 := 1; 
   TXF.eM12 := 0; 
   TXF.eM21 := 0; 
   TXF.eM22 := 1; 
   TXF.eDx := 100; 
   TXF.eDy := 0; 
  end; 
  2: begin {上移 40} 
   TXF.eM11 := 1; 
   TXF.eM12 := 0; 
   TXF.eM21 := 0; 
   TXF.eM22 := 1; 
   TXF.eDx := 0; 
   TXF.eDy := -40; 
  end; 
  3: begin {橫向放大 1.5} 
   TXF.eM11 := 1.5; 
   TXF.eM12 := 0; 
   TXF.eM21 := 0; 
   TXF.eM22 := 1; 
   TXF.eDx := 0; 
   TXF.eDy := 0; 
  end; 
  4: begin {縱向放大 1.5} 
   TXF.eM11 := 1; 
   TXF.eM12 := 0; 
   TXF.eM21 := 0; 
   TXF.eM22 := 1.5; 
   TXF.eDx := 0; 
   TXF.eDy := 0; 
  end; 
5: begin {整體放大 1.5 倍} 
   TXF.eM11 := 1.5; 
   TXF.eM12 := 0; 
   TXF.eM21 := 0; 
   TXF.eM22 := 1.5; 
   TXF.eDx := 0; 
   TXF.eDy := 0; 
  end; 
  6: begin {整體縮小一半} 
   TXF.eM11 := 0.5; 
   TXF.eM12 := 0; 
   TXF.eM21 := 0; 
   TXF.eM22 := 0.5; 
   TXF.eDx := 0; 
   TXF.eDy := 0; 
  end; 
  7: begin {水平鏡像} 
   TXF.eM11 := -1; 
   TXF.eM12 := 0; 
   TXF.eM21 := 0; 
   TXF.eM22 := 1; 
   TXF.eDx := 200; {需要右移一些才能看到} 
   TXF.eDy := 0; 
  end; 
  8: begin {垂直鏡像} 
   TXF.eM11 := 1; 
   TXF.eM12 := 0; 
   TXF.eM21 := 0; 
   TXF.eM22 := -1; 
   TXF.eDx := 0; 
   TXF.eDy := 200; {需要下移一些才能看到} 
  end; 
  9: begin {橫向斜切} 
   TXF.eM11 := 1; 
   TXF.eM12 := 0.75; 
   TXF.eM21 := 0; 
   TXF.eM22 := 1; 
   TXF.eDx := 0; 
   TXF.eDy := 0; 
  end; 
  10: begin {縱向斜切} 
   TXF.eM11 := 1; 
   TXF.eM12 := 0; 
   TXF.eM21 := 0.75; 
   TXF.eM22 := 1; 
   TXF.eDx := 0; 
   TXF.eDy := 0; 
  end; 
  11: begin {旋轉 30 度} 
   TXF.eM11 := Cos(30*PI/180); 
   TXF.eM12 := Sin(30*PI/180); 
   TXF.eM21 := -Sin(30*PI/180); 
   TXF.eM22 := Cos(30*PI/180); 
   TXF.eDx := 0; 
   TXF.eDy := 0; 
  end; 
 end; 
 
 {執行變換並重繪} 
 Rgn := ExtCreateRegion(@TXF, RgnDataSize, RgnData^); 
 Repaint; 
 
 FreeMem(RgnData); 
end; 
 
end. 

  窗體文件:

object Form1: TForm1 
 Left = 0 
 Top = 0 
 Caption = 'Form1' 
 ClIEntHeight = 259 
 ClIEntWidth = 433 
 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 
 OnPaint = FormPaint 
 PixelsPerInch = 96 
 TextHeight = 13 
 object RadioGroup1: TRadioGroup 
  Left = 320 
  Top = 8 
  Width = 103 
  Height = 243 
  Caption = 'RadioGroup1' 
  TabOrder = 0 
  OnClick = RadioGroup1Click 
 end 
end 

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